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<title>Queue Subscriptions ยท NATS</title>
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Introduction
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What's New in 2.0
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What is NATS
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Subject-Based Messaging
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Publish-Subscribe
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Request-Reply
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Queue Groups
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Acknowledgements
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<a href="../concepts/seq_num.html">
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Sequence Numbers
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</a>
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<li class="header">Developing With NATS</li>
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<a href="../">
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Introduction
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Connecting
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Connecting to the Default Server
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</a>
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Connecting to a Specific Server
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Connecting to a Cluster
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</a>
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<li class="chapter " data-level="3.2.4" data-path="../connecting/connect_timeout.html">
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<a href="../connecting/connect_timeout.html">
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Setting a Connect Timeout
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</a>
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<li class="chapter " data-level="3.2.5" data-path="../connecting/pingpong.html">
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Ping/Pong Protocol
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</a>
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Controlling the Client/Server Protocol
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<a href="../connecting/noecho.html">
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Turning Off Echo'd Messages
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</a>
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</li>
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</ul>
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<li class="chapter " data-level="3.3" data-path="../reconnect/intro.html">
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<a href="../reconnect/intro.html">
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Automatic Reconnections
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</a>
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<ul class="articles">
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<a href="../reconnect/disable.html">
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Disabling Reconnect
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</a>
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<li class="chapter " data-level="3.3.2" data-path="../reconnect/max.html">
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<a href="../reconnect/max.html">
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Set the Number of Reconnect Attempts
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</a>
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</li>
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<li class="chapter " data-level="3.3.3" data-path="../reconnect/wait.html">
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<a href="../reconnect/wait.html">
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Pausing Between Reconnect Attempts
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</a>
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</li>
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<li class="chapter " data-level="3.3.4" data-path="../reconnect/random.html">
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<a href="../reconnect/random.html">
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Avoiding the Thundering Herd
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</a>
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</li>
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<li class="chapter " data-level="3.3.5" data-path="../reconnect/events.html">
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<a href="../reconnect/events.html">
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Listening for Reconnect Events
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</a>
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</li>
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<li class="chapter " data-level="3.3.6" data-path="../reconnect/buffer.html">
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<a href="../reconnect/buffer.html">
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Buffering Messages During Reconnect Attempts
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</a>
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</li>
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</ul>
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<li class="chapter " data-level="3.4" data-path="../security/intro.html">
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<a href="../security/intro.html">
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Securing Connections
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.4.1" data-path="../security/userpass.html">
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<a href="../security/userpass.html">
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Authenticating with a User and Password
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</a>
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</li>
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<li class="chapter " data-level="3.4.2" data-path="../security/token.html">
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<a href="../security/token.html">
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Authenticating with a Token
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</a>
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</li>
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<li class="chapter " data-level="3.4.3" data-path="../security/nkey.html">
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<a href="../security/nkey.html">
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Authenticating with an NKey
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</a>
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</li>
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<li class="chapter " data-level="3.4.4" data-path="../security/creds.html">
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<a href="../security/creds.html">
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Authenticating with a Credentials File
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</a>
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</li>
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<li class="chapter " data-level="3.4.5" data-path="../security/tls.html">
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<a href="../security/tls.html">
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Encrypting Connections with TLS
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.5" data-path="intro.html">
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<a href="intro.html">
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Receiving Messages
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.5.1" data-path="sync.html">
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<a href="sync.html">
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Synchronous Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.2" data-path="async.html">
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<a href="async.html">
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Asynchronous Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.3" data-path="unsubscribing.html">
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<a href="unsubscribing.html">
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Unsubscribing
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</a>
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</li>
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<li class="chapter " data-level="3.5.4" data-path="unsub_after.html">
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<a href="unsub_after.html">
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Unsubscribing After N Messages
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</a>
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</li>
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<li class="chapter " data-level="3.5.5" data-path="reply.html">
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<a href="reply.html">
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Replying to a Message
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</a>
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</li>
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<li class="chapter " data-level="3.5.6" data-path="wildcards.html">
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<a href="wildcards.html">
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Wildcard Subscriptions
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</a>
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</li>
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<li class="chapter active" data-level="3.5.7" data-path="queues.html">
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<a href="queues.html">
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Queue Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.8" data-path="drain.html">
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<a href="drain.html">
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Draining Messages Before Disconnect
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</a>
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</li>
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<li class="chapter " data-level="3.5.9" data-path="structure.html">
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<a href="structure.html">
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Structured Data
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.6" data-path="../sending/intro.html">
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<a href="../sending/intro.html">
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Sending Messages
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.6.1" data-path="../sending/replyto.html">
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<a href="../sending/replyto.html">
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Including a Reply Subject
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</a>
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</li>
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<li class="chapter " data-level="3.6.2" data-path="../sending/request_reply.html">
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<a href="../sending/request_reply.html">
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Request-Reply Semantics
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</a>
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</li>
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<li class="chapter " data-level="3.6.3" data-path="../sending/caches.html">
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<a href="../sending/caches.html">
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Caches, Flush and Ping
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</a>
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</li>
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<li class="chapter " data-level="3.6.4" data-path="../sending/structure.html">
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<a href="../sending/structure.html">
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Sending Structured Data
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.7" data-path="../events/intro.html">
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<a href="../events/intro.html">
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Monitoring the Connection
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.7.1" data-path="../events/events.html">
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<a href="../events/events.html">
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Listen for Connection Events
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</a>
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</li>
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<li class="chapter " data-level="3.7.2" data-path="../events/slow.html">
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<a href="../events/slow.html">
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Slow Consumers
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.8" data-path="../tutorials/intro.html">
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<a href="../tutorials/intro.html">
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Tutorials
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.8.1" data-path="../tutorials/pubsub.html">
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<a href="../tutorials/pubsub.html">
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Explore NATS Pub/Sub
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</a>
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</li>
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<li class="chapter " data-level="3.8.2" data-path="../tutorials/reqreply.html">
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<a href="../tutorials/reqreply.html">
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Explore NATS Request/Reply
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</a>
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</li>
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<li class="chapter " data-level="3.8.3" data-path="../tutorials/queues.html">
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<a href="../tutorials/queues.html">
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Explore NATS Queueing
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</a>
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</li>
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<li class="chapter " data-level="3.8.4" data-path="../tutorials/custom_dialer.html">
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<a href="../tutorials/custom_dialer.html">
|
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Advanced Connect and Custom Dialer in Go
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</a>
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</li>
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</ul>
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</li>
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<li class="header">NATS Server</li>
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<li class="chapter " data-level="4.1" data-path="../../nats_server/installation.html">
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<a href="../../nats_server/installation.html">
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Installing
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</a>
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</li>
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<li class="chapter " data-level="4.2" data-path="../../nats_server/running.html">
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<a href="../../nats_server/running.html">
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Running
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</a>
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<ul class="articles">
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<li class="chapter " data-level="4.2.1" data-path="../../nats_server/windows_srv.html">
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<a href="../../nats_server/windows_srv.html">
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Window Service
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="4.3" data-path="../../nats_server/clients.html">
|
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<a href="../../nats_server/clients.html">
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|
Clients
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</a>
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</li>
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<li class="chapter " data-level="4.4" data-path="../../nats_server/flags.html">
|
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|
<a href="../../nats_server/flags.html">
|
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|
Flags
|
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</a>
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</li>
|
|
|
|
<li class="chapter " data-level="4.5" data-path="../../nats_server/configuration.html">
|
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<a href="../../nats_server/configuration.html">
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|
Configuration
|
|
|
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</a>
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|
<ul class="articles">
|
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|
|
<li class="chapter " data-level="4.5.1" data-path="../../nats_server/securing_nats.html">
|
|
|
|
<a href="../../nats_server/securing_nats.html">
|
|
|
|
|
|
Securing NATS
|
|
|
|
</a>
|
|
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<ul class="articles">
|
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|
<li class="chapter " data-level="4.5.1.1" data-path="../../nats_server/tls.html">
|
|
|
|
<a href="../../nats_server/tls.html">
|
|
|
|
|
|
Enabling TLS
|
|
|
|
</a>
|
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|
|
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</li>
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|
|
|
<li class="chapter " data-level="4.5.1.2" data-path="../../nats_server/auth_intro.html">
|
|
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|
<a href="../../nats_server/auth_intro.html">
|
|
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|
|
|
Authentication
|
|
|
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</a>
|
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<ul class="articles">
|
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|
|
<li class="chapter " data-level="4.5.1.2.1" data-path="../../nats_server/tokens.html">
|
|
|
|
<a href="../../nats_server/tokens.html">
|
|
|
|
|
|
Tokens
|
|
|
|
</a>
|
|
|
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|
|
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</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.2" data-path="../../nats_server/username_password.html">
|
|
|
|
<a href="../../nats_server/username_password.html">
|
|
|
|
|
|
Username/Password
|
|
|
|
</a>
|
|
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|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.3" data-path="../../nats_server/tls_mutual_auth.html">
|
|
|
|
<a href="../../nats_server/tls_mutual_auth.html">
|
|
|
|
|
|
TLS Authentication
|
|
|
|
</a>
|
|
|
|
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.4" data-path="../../nats_server/nkey_auth.html">
|
|
|
|
<a href="../../nats_server/nkey_auth.html">
|
|
|
|
|
|
NKeys
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.5" data-path="../../nats_server/accounts.html">
|
|
|
|
<a href="../../nats_server/accounts.html">
|
|
|
|
|
|
Accounts
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.6" data-path="../../nats_server/jwt_auth.html">
|
|
|
|
<a href="../../nats_server/jwt_auth.html">
|
|
|
|
|
|
JWTs
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.7" data-path="../../nats_server/auth_timeout.html">
|
|
|
|
<a href="../../nats_server/auth_timeout.html">
|
|
|
|
|
|
Authentication Timeout
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.3" data-path="../../nats_server/authorization.html">
|
|
|
|
<a href="../../nats_server/authorization.html">
|
|
|
|
|
|
Authorization
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.2" data-path="../../nats_server/clustering.html">
|
|
|
|
<a href="../../nats_server/clustering.html">
|
|
|
|
|
|
Clustering
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.2.1" data-path="../../nats_server/cluster_config.html">
|
|
|
|
<a href="../../nats_server/cluster_config.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.2.2" data-path="../../nats_server/cluster_tls.html">
|
|
|
|
<a href="../../nats_server/cluster_tls.html">
|
|
|
|
|
|
TLS Authentication
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.3" data-path="../../gateways/">
|
|
|
|
<a href="../../gateways/">
|
|
|
|
|
|
Gateways
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.3.1" data-path="../../gateways/gateway.html">
|
|
|
|
<a href="../../gateways/gateway.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.4" data-path="../../leafnodes/">
|
|
|
|
<a href="../../leafnodes/">
|
|
|
|
|
|
Leaf Nodes
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.4.1" data-path="../../leafnodes/leafnode_conf.html">
|
|
|
|
<a href="../../leafnodes/leafnode_conf.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.5" data-path="../../nats_server/logging.html">
|
|
|
|
<a href="../../nats_server/logging.html">
|
|
|
|
|
|
Logging
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.6" data-path="../../nats_server/monitoring.html">
|
|
|
|
<a href="../../nats_server/monitoring.html">
|
|
|
|
|
|
Monitoring
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6" data-path="../../nats_admin/">
|
|
|
|
<a href="../../nats_admin/">
|
|
|
|
|
|
Managing A NATS Server
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.6.1" data-path="../../nats_admin/upgrading_cluster.html">
|
|
|
|
<a href="../../nats_admin/upgrading_cluster.html">
|
|
|
|
|
|
Upgrading a Cluster
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.2" data-path="../../nats_admin/slow_consumers.html">
|
|
|
|
<a href="../../nats_admin/slow_consumers.html">
|
|
|
|
|
|
Slow Consumers
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.3" data-path="../../nats_admin/signals.html">
|
|
|
|
<a href="../../nats_admin/signals.html">
|
|
|
|
|
|
Signals
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.4" data-path="../../sys_accounts/">
|
|
|
|
<a href="../../sys_accounts/">
|
|
|
|
|
|
System Accounts
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.6.4.1" data-path="../../sys_accounts/sys_accounts.html">
|
|
|
|
<a href="../../sys_accounts/sys_accounts.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.7" data-path="../../nats_docker/">
|
|
|
|
<a href="../../nats_docker/">
|
|
|
|
|
|
NATS and Docker
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.7.1" data-path="../../nats_docker/tutorial.html">
|
|
|
|
<a href="../../nats_docker/tutorial.html">
|
|
|
|
|
|
Tutorial
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.7.2" data-path="../../nats_docker/docker_swarm.html">
|
|
|
|
<a href="../../nats_docker/docker_swarm.html">
|
|
|
|
|
|
Docker Swarm
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
<li class="header">NATS Tools</li>
|
|
|
|
|
|
|
|
<li class="chapter " data-level="5.1" data-path="../../nats_tools/mkpasswd.html">
|
|
|
|
<a href="../../nats_tools/mkpasswd.html">
|
|
|
|
|
|
mkpasswd
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.2" data-path="../../nats_tools/nk.html">
|
|
|
|
<a href="../../nats_tools/nk.html">
|
|
|
|
|
|
nk
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3" data-path="../../nats_tools/nsc/">
|
|
|
|
<a href="../../nats_tools/nsc/">
|
|
|
|
|
|
nsc
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="5.3.1" data-path="../../nats_tools/nsc/nsc.html">
|
|
|
|
<a href="../../nats_tools/nsc/nsc.html">
|
|
|
|
|
|
Basics
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.2" data-path="../../nats_tools/nsc/streams.html">
|
|
|
|
<a href="../../nats_tools/nsc/streams.html">
|
|
|
|
|
|
Streams
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.3" data-path="../../nats_tools/nsc/services.html">
|
|
|
|
<a href="../../nats_tools/nsc/services.html">
|
|
|
|
|
|
Services
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.4" data-path="../../nats_tools/nsc/signing_keys.html">
|
|
|
|
<a href="../../nats_tools/nsc/signing_keys.html">
|
|
|
|
|
|
Signing Keys
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4" data-path="../../nats_tools/nas/">
|
|
|
|
<a href="../../nats_tools/nas/">
|
|
|
|
|
|
nats-account-server
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="5.4.1" data-path="../../nats_tools/nas/nas_conf.html">
|
|
|
|
<a href="../../nats_tools/nas/nas_conf.html">
|
|
|
|
|
|
Basics
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4.2" data-path="../../nats_tools/nas/inspecting_jwts.html">
|
|
|
|
<a href="../../nats_tools/nas/inspecting_jwts.html">
|
|
|
|
|
|
Inspecting JWTs
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4.3" data-path="../../nats_tools/nas/mem_resolver.html">
|
|
|
|
<a href="../../nats_tools/nas/mem_resolver.html">
|
|
|
|
|
|
Memory Resolver
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.5" data-path="../../nats_tools/nats_top/">
|
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<a href="../../nats_tools/nats_top/">
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nats-top
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</a>
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<ul class="articles">
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<li class="chapter " data-level="5.5.1" data-path="../../nats_tools/nats_top/tutorial.html">
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<a href="../../nats_tools/nats_top/tutorial.html">
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Tutorial
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="5.6" data-path="../../nats_tools/natsbench.html">
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<a href="../../nats_tools/natsbench.html">
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nats-bench
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</a>
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</li>
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<li class="header">NATS Streaming Concepts</li>
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<li class="chapter " data-level="6.1" data-path="../../nats_streaming/intro.html">
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<a href="../../nats_streaming/intro.html">
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Introduction
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.1.1" data-path="../../nats_streaming/relation-to-nats.html">
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<a href="../../nats_streaming/relation-to-nats.html">
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Relation to NATS
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="6.2" data-path="../../nats_streaming/client-connections.html">
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<a href="../../nats_streaming/client-connections.html">
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Client Connections
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</a>
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</li>
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<li class="chapter " data-level="6.3" data-path="../../nats_streaming/channels/channels.html">
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<a href="../../nats_streaming/channels/channels.html">
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Channels
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.3.1" data-path="../../nats_streaming/channels/message-log.html">
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<a href="../../nats_streaming/channels/message-log.html">
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Message Log
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</a>
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</li>
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<li class="chapter " data-level="6.3.2" data-path="../../nats_streaming/channels/subscriptions/subscriptions.html">
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<a href="../../nats_streaming/channels/subscriptions/subscriptions.html">
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Subscriptions
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.3.2.1" data-path="../../nats_streaming/channels/subscriptions/regular.html">
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<a href="../../nats_streaming/channels/subscriptions/regular.html">
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Regular
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</a>
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</li>
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<li class="chapter " data-level="6.3.2.2" data-path="../../nats_streaming/channels/subscriptions/durable.html">
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<a href="../../nats_streaming/channels/subscriptions/durable.html">
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Durable
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</a>
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</li>
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<li class="chapter " data-level="6.3.2.3" data-path="../../nats_streaming/channels/subscriptions/queue-group.html">
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<a href="../../nats_streaming/channels/subscriptions/queue-group.html">
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Queue Group
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</a>
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</li>
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<li class="chapter " data-level="6.3.2.4" data-path="../../nats_streaming/channels/subscriptions/redelivery.html">
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<a href="../../nats_streaming/channels/subscriptions/redelivery.html">
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Redelivery
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</a>
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</li>
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</ul>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="6.4" data-path="../../nats_streaming/store-interface.html">
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<a href="../../nats_streaming/store-interface.html">
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Store Interface
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</a>
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</li>
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<li class="chapter " data-level="6.5" data-path="../../nats_streaming/store-encryption.html">
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<a href="../../nats_streaming/store-encryption.html">
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Store Encryption
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</a>
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</li>
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<li class="chapter " data-level="6.6" data-path="../../nats_streaming/clustering/clustering.html">
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<a href="../../nats_streaming/clustering/clustering.html">
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Clustering
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.6.1" data-path="../../nats_streaming/clustering/supported-stores.html">
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<a href="../../nats_streaming/clustering/supported-stores.html">
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Supported Stores
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</a>
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</li>
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<li class="chapter " data-level="6.6.2" data-path="../../nats_streaming/clustering/configuration.html">
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<a href="../../nats_streaming/clustering/configuration.html">
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Configuration
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</a>
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</li>
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<li class="chapter " data-level="6.6.3" data-path="../../nats_streaming/clustering/auto-configuration.html">
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<a href="../../nats_streaming/clustering/auto-configuration.html">
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Auto Configuration
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</a>
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</li>
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<li class="chapter " data-level="6.6.4" data-path="../../nats_streaming/clustering/containers.html">
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<a href="../../nats_streaming/clustering/containers.html">
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Containers
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="6.7" data-path="../../nats_streaming/fault-tolerance/ft.html">
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<a href="../../nats_streaming/fault-tolerance/ft.html">
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Fault Tolerance
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.7.1" data-path="../../nats_streaming/fault-tolerance/active-server.html">
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<a href="../../nats_streaming/fault-tolerance/active-server.html">
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Active Server
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</a>
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</li>
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<li class="chapter " data-level="6.7.2" data-path="../../nats_streaming/fault-tolerance/standby-server.html">
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<a href="../../nats_streaming/fault-tolerance/standby-server.html">
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Standby Servers
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</a>
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</li>
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<li class="chapter " data-level="6.7.3" data-path="../../nats_streaming/fault-tolerance/shared-state.html">
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<a href="../../nats_streaming/fault-tolerance/shared-state.html">
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Shared State
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</a>
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</li>
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<li class="chapter " data-level="6.7.4" data-path="../../nats_streaming/fault-tolerance/failover.html">
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<a href="../../nats_streaming/fault-tolerance/failover.html">
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Failover
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="6.8" data-path="../../nats_streaming/partitioning.html">
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<a href="../../nats_streaming/partitioning.html">
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Partitioning
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</a>
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</li>
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<li class="header">Developing With NATS Streaming</li>
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<li class="chapter " data-level="7.1" data-path="../streaming/">
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<a href="../streaming/">
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Introduction
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</a>
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</li>
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<li class="chapter " data-level="7.2" data-path="../streaming/connecting.html">
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<a href="../streaming/connecting.html">
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Connecting to NATS Streaming
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</a>
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</li>
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<li class="chapter " data-level="7.3" data-path="../streaming/publishing.html">
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<a href="../streaming/publishing.html">
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Publishing to a Channel
|
|
|
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</a>
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</li>
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<li class="chapter " data-level="7.4" data-path="../streaming/receiving.html">
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<a href="../streaming/receiving.html">
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Receiving Messages from a Channel
|
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</a>
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</li>
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<li class="chapter " data-level="7.5" data-path="../streaming/durables.html">
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<a href="../streaming/durables.html">
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Durable Subscriptions
|
|
|
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</a>
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</li>
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<li class="chapter " data-level="7.6" data-path="../streaming/queues.html">
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<a href="../streaming/queues.html">
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Queue Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="7.7" data-path="../streaming/acks.html">
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<a href="../streaming/acks.html">
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Acknowledgements
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</a>
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</li>
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<li class="chapter " data-level="7.8" data-path="../streaming/protocol.html">
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<a href="../streaming/protocol.html">
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The Streaming Protocol
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</a>
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</li>
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<li class="header">NATS Streaming Server</li>
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<li class="chapter " data-level="8.1" data-path="../../nats_streaming/gettingstarted/install.html">
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<a href="../../nats_streaming/gettingstarted/install.html">
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Installing
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</a>
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</li>
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<li class="chapter " data-level="8.2" data-path="../../nats_streaming/gettingstarted/run.html">
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<a href="../../nats_streaming/gettingstarted/run.html">
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Running
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</a>
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</li>
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<li class="chapter " data-level="8.3" data-path="../../nats_streaming/gettingstarted/configuring.html">
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<a href="../../nats_streaming/gettingstarted/configuring.html">
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Configuring
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</a>
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</li>
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<li class="chapter " data-level="8.4" data-path="../../nats_streaming/gettingstarted/tls.html">
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<a href="../../nats_streaming/gettingstarted/tls.html">
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Securing
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</a>
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</li>
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<li class="chapter " data-level="8.5" data-path="../../nats_streaming/gettingstarted/process-signaling.html">
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<a href="../../nats_streaming/gettingstarted/process-signaling.html">
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Process Signaling
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</a>
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</li>
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<li class="chapter " data-level="8.6" data-path="../../nats_streaming/gettingstarted/windows-service.html">
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<a href="../../nats_streaming/gettingstarted/windows-service.html">
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Windows Service
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</a>
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</li>
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<li class="chapter " data-level="8.7" data-path="../streaming/embedding.html">
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<a href="../streaming/embedding.html">
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Embedding NATS Streaming Server
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</a>
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</li>
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<li class="chapter " data-level="8.8" data-path="../../nats_streaming/swarm.html">
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<a href="../../nats_streaming/swarm.html">
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Docker Swarm
|
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</a>
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</li>
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<li class="chapter " data-level="8.9" data-path="../../nats_streaming/monitoring/monitoring.html">
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<a href="../../nats_streaming/monitoring/monitoring.html">
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Monitoring
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</a>
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<ul class="articles">
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<li class="chapter " data-level="8.9.1" data-path="../../nats_streaming/monitoring/enabling.html">
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<a href="../../nats_streaming/monitoring/enabling.html">
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Enabling
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</a>
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</li>
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<li class="chapter " data-level="8.9.2" data-path="../../nats_streaming/monitoring/endpoints.html">
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<a href="../../nats_streaming/monitoring/endpoints.html">
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Endpoints
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</a>
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</li>
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</ul>
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</li>
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<li class="header">NATS Protocol</li>
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<li class="chapter " data-level="9.1" data-path="../../nats_protocol/nats-protocol-demo.html">
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|
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<a href="../../nats_protocol/nats-protocol-demo.html">
|
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Protocol Demo
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</a>
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</li>
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<li class="chapter " data-level="9.2" data-path="../../nats_protocol/nats-protocol.html">
|
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<a href="../../nats_protocol/nats-protocol.html">
|
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Client Protocol
|
|
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</a>
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<ul class="articles">
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<li class="chapter " data-level="9.2.1" data-path="../../nats_protocol/nats-client-dev.html">
|
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<a href="../../nats_protocol/nats-client-dev.html">
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Developing a Client
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="9.3" data-path="../../nats_protocol/nats-server-protocol.html">
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<a href="../../nats_protocol/nats-server-protocol.html">
|
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NATS Cluster Protocol
|
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</a>
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</li>
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<li class="divider"></li>
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<li>
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<a href="https://www.gitbook.com" target="blank" class="gitbook-link">
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Published with GitBook
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</a>
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</ul>
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<section class="normal markdown-section">
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|
<h1 id="queue-subscriptions"><a name="queue-subscriptions" class="plugin-anchor" href="#queue-subscriptions"><i class="fa fa-link" aria-hidden="true"></i></a>Queue Subscriptions</h1>
|
|
<p>Subscribing to a queue group is only slightly different than subscribing to a subject alone. The application simply includes a queue name with the subscription. The effect of including the group is fairly major, since the server will now load balance messages between the members of the queue group, but the code differences are minimal.</p>
|
|
<p>Keep in mind that the queue groups in NATS are dynamic and do not require any server configuration. You can almost think of a regular subscription as a queue group of 1, but it is probably not worth thinking too much about that.</p>
|
|
<div class="graphviz"><code data-viz="dot">
|
|
digraph g {
|
|
rankdir=LR
|
|
publisher [shape=box, style="rounded", label="PUB updates"];
|
|
subject [shape=circle, label="nats-server"];
|
|
sub1 [shape=box, style="rounded", label="SUB updates workers"];
|
|
sub2 [shape=box, style="rounded", label="SUB updates workers"];
|
|
sub3 [shape=box, style="rounded", label="SUB updates workers"];
|
|
|
|
publisher -> subject [label="msgs 1,2,3"];
|
|
subject -> sub1 [label="msg 2"];
|
|
subject -> sub2 [label="msg 1"];
|
|
subject -> sub3 [label="msg 3"];
|
|
}
|
|
</code></div>
|
|
|
|
<p>As an example, to subscribe to the queue <code>workers</code> with the subject <code>updates</code>:</p>
|
|
<div class="tab-wrap">
|
|
|
|
|
|
<input type="radio" id="subscribe_queue_go" name="subscribe_queue" class="tab" checked>
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|
<label for="subscribe_queue_go" class="api-lang" data-language="go">Go</label>
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<input type="radio" id="subscribe_queue_java" name="subscribe_queue" class="tab">
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|
<label for="subscribe_queue_java" class="api-lang" data-language="java">Java</label>
|
|
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|
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|
<input type="radio" id="subscribe_queue_js" name="subscribe_queue" class="tab">
|
|
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|
<label for="subscribe_queue_js" class="api-lang" data-language="js">JavaScript</label>
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|
<input type="radio" id="subscribe_queue_py" name="subscribe_queue" class="tab">
|
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|
<label for="subscribe_queue_py" class="api-lang" data-language="py">Python</label>
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<input type="radio" id="subscribe_queue_ruby" name="subscribe_queue" class="tab">
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|
<label for="subscribe_queue_ruby" class="api-lang" data-language="ruby">Ruby</label>
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<input type="radio" id="subscribe_queue_ts" name="subscribe_queue" class="tab">
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<label for="subscribe_queue_ts" class="api-lang" data-language="ts">TypeScript</label>
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<div class="tab__content">
|
|
<pre id="subscribe_queue_go_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/go-nats-examples/blob/master/api-examples/subscribe_queue/main.go#L11-34"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-go">nc<span class="token punctuation">,</span> err <span class="token operator">:=</span> nats<span class="token punctuation">.</span><span class="token function">Connect</span><span class="token punctuation">(</span><span class="token string">"demo.nats.io"</span><span class="token punctuation">)</span>
|
|
<span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
|
|
log<span class="token punctuation">.</span><span class="token function">Fatal</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token keyword">defer</span> nc<span class="token punctuation">.</span><span class="token function">Close</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token comment">// Use a WaitGroup to wait for 10 messages to arrive</span>
|
|
wg <span class="token operator">:=</span> sync<span class="token punctuation">.</span>WaitGroup<span class="token punctuation">{</span><span class="token punctuation">}</span>
|
|
wg<span class="token punctuation">.</span><span class="token function">Add</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token comment">// Create a queue subscription on "updates" with queue name "workers"</span>
|
|
<span class="token keyword">if</span> <span class="token boolean">_</span><span class="token punctuation">,</span> err <span class="token operator">:=</span> nc<span class="token punctuation">.</span><span class="token function">QueueSubscribe</span><span class="token punctuation">(</span><span class="token string">"updates"</span><span class="token punctuation">,</span> <span class="token string">"worker"</span><span class="token punctuation">,</span> <span class="token keyword">func</span><span class="token punctuation">(</span>m <span class="token operator">*</span>nats<span class="token punctuation">.</span>Msg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
wg<span class="token punctuation">.</span><span class="token function">Done</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
|
|
log<span class="token punctuation">.</span><span class="token function">Fatal</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
<span class="token comment">// Wait for messages to come in</span>
|
|
wg<span class="token punctuation">.</span><span class="token function">Wait</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token comment">// Close the connection</span>
|
|
nc<span class="token punctuation">.</span><span class="token function">Close</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
</code></pre>
|
|
</div>
|
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<div class="tab__content">
|
|
<pre id="subscribe_queue_java_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/java-nats-examples/blob/master/src/main/java/io/nats/examples/SubscribeQueue.java#L14-35"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-java"><span class="token class-name">Connection</span> nc <span class="token operator">=</span> <span class="token class-name">Nats</span><span class="token punctuation">.</span><span class="token function">connect</span><span class="token punctuation">(</span><span class="token string">"nats://demo.nats.io:4222"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token comment">// Use a latch to wait for 10 messages to arrive</span>
|
|
<span class="token class-name">CountDownLatch</span> latch <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">CountDownLatch</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token comment">// Create a dispatcher and inline message handler</span>
|
|
<span class="token class-name">Dispatcher</span> d <span class="token operator">=</span> nc<span class="token punctuation">.</span><span class="token function">createDispatcher</span><span class="token punctuation">(</span><span class="token punctuation">(</span>msg<span class="token punctuation">)</span> <span class="token operator">-></span> <span class="token punctuation">{</span>
|
|
<span class="token class-name">String</span> str <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span>msg<span class="token punctuation">.</span><span class="token function">getData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token class-name">StandardCharsets</span><span class="token punctuation">.</span>UTF_8<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>str<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
latch<span class="token punctuation">.</span><span class="token function">countDown</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token comment">// Subscribe</span>
|
|
d<span class="token punctuation">.</span><span class="token function">subscribe</span><span class="token punctuation">(</span><span class="token string">"updates"</span><span class="token punctuation">,</span> <span class="token string">"workers"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token comment">// Wait for a message to come in</span>
|
|
latch<span class="token punctuation">.</span><span class="token function">await</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token comment">// Close the connection</span>
|
|
nc<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
</div>
|
|
|
|
<div class="tab__content">
|
|
<pre id="subscribe_queue_js_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/node-nats-examples/blob/master/src/subscriber_samples.js#L217-221"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-javascript">nc<span class="token punctuation">.</span><span class="token function">subscribe</span><span class="token punctuation">(</span><span class="token string">'updates'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>queue<span class="token punctuation">:</span> <span class="token string">"workers"</span><span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">msg</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
|
|
t<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'worker got message'</span><span class="token punctuation">,</span> msg<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
</div>
|
|
|
|
<div class="tab__content">
|
|
<pre id="subscribe_queue_py_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/asyncio-nats-examples/blob/master/subscribe_queue.py#L6-23"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-python">nc <span class="token operator">=</span> NATS<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token keyword">await</span> nc<span class="token punctuation">.</span>connect<span class="token punctuation">(</span>servers<span class="token operator">=</span><span class="token punctuation">[</span><span class="token string">"nats://demo.nats.io:4222"</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
|
|
|
|
future <span class="token operator">=</span> asyncio<span class="token punctuation">.</span>Future<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token keyword">async</span> <span class="token keyword">def</span> <span class="token function">cb</span><span class="token punctuation">(</span>msg<span class="token punctuation">)</span><span class="token punctuation">:</span>
|
|
<span class="token keyword">nonlocal</span> future
|
|
future<span class="token punctuation">.</span>set_result<span class="token punctuation">(</span>msg<span class="token punctuation">)</span>
|
|
|
|
<span class="token keyword">await</span> nc<span class="token punctuation">.</span>subscribe<span class="token punctuation">(</span><span class="token string">"updates"</span><span class="token punctuation">,</span> queue<span class="token operator">=</span><span class="token string">"workers"</span><span class="token punctuation">,</span> cb<span class="token operator">=</span>cb<span class="token punctuation">)</span>
|
|
<span class="token keyword">await</span> nc<span class="token punctuation">.</span>publish<span class="token punctuation">(</span><span class="token string">"updates"</span><span class="token punctuation">,</span> <span class="token string">b'All is Well'</span><span class="token punctuation">)</span>
|
|
|
|
msg <span class="token operator">=</span> <span class="token keyword">await</span> asyncio<span class="token punctuation">.</span>wait_for<span class="token punctuation">(</span>future<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span>
|
|
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">"Msg"</span><span class="token punctuation">,</span> msg<span class="token punctuation">)</span>
|
|
|
|
</code></pre>
|
|
</div>
|
|
|
|
<div class="tab__content">
|
|
<pre id="subscribe_queue_ruby_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ruby-nats-examples/blob/master/subscribe_queue.rb#L1-21"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-ruby"><span class="token keyword">require</span> <span class="token string">'nats/client'</span>
|
|
<span class="token keyword">require</span> <span class="token string">'fiber'</span>
|
|
|
|
<span class="token constant">NATS</span><span class="token punctuation">.</span>start<span class="token punctuation">(</span>servers<span class="token punctuation">:</span><span class="token punctuation">[</span><span class="token string">"nats://127.0.0.1:4222"</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token keyword">do</span> <span class="token operator">|</span>nc<span class="token operator">|</span>
|
|
<span class="token constant">Fiber</span><span class="token punctuation">.</span><span class="token keyword">new</span> <span class="token class-name">do</span>
|
|
f <span class="token operator">=</span> <span class="token constant">Fiber</span><span class="token punctuation">.</span>current
|
|
|
|
nc<span class="token punctuation">.</span>subscribe<span class="token punctuation">(</span><span class="token string">"updates"</span><span class="token punctuation">,</span> queue<span class="token punctuation">:</span> <span class="token string">"worker"</span><span class="token punctuation">)</span> <span class="token keyword">do</span> <span class="token operator">|</span>msg<span class="token punctuation">,</span> reply<span class="token operator">|</span>
|
|
f<span class="token punctuation">.</span>resume <span class="token builtin">Time</span><span class="token punctuation">.</span>now
|
|
<span class="token keyword">end</span>
|
|
|
|
nc<span class="token punctuation">.</span>publish<span class="token punctuation">(</span><span class="token string">"updates"</span><span class="token punctuation">,</span> <span class="token string">"A"</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token comment"># Use the response</span>
|
|
msg <span class="token operator">=</span> <span class="token constant">Fiber</span><span class="token punctuation">.</span><span class="token keyword">yield</span>
|
|
puts <span class="token string">"Msg: <span class="token interpolation"><span class="token delimiter tag">#{</span>msg<span class="token delimiter tag">}</span></span>"</span>
|
|
<span class="token keyword">end</span><span class="token punctuation">.</span>resume
|
|
<span class="token keyword">end</span>
|
|
|
|
</code></pre>
|
|
</div>
|
|
|
|
<div class="tab__content">
|
|
<pre id="subscribe_queue_ts_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ts-nats-examples/blob/master/src/subscriber_samples.ts#L193-197"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-javascript"><span class="token keyword">await</span> nc<span class="token punctuation">.</span><span class="token function">subscribe</span><span class="token punctuation">(</span><span class="token string">'updates'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> msg</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
|
|
t<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'worker got message'</span><span class="token punctuation">,</span> msg<span class="token punctuation">.</span>data<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>queue<span class="token punctuation">:</span> <span class="token string">"workers"</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
</div>
|
|
|
|
</div>
|
|
<p>If you run this example with the publish examples that send to <code>updates</code>, you will see that one of the instances gets a message while the others you run won't. But the instance that receives the message will change.</p>
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</section>
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<script>
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var gitbook = gitbook || [];
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|
if (copyTest === true) {
|
|
var copyTextArea = document.createElement("textarea");
|
|
copyTextArea.value = text;
|
|
document.body.appendChild(copyTextArea);
|
|
copyTextArea.select();
|
|
try {
|
|
var successful = document.execCommand('copy');
|
|
var msg = successful ? 'Copied!' : 'Whoops, not copied!';
|
|
var parent = el.parentNode.parentNode;
|
|
var msgElem = parent.querySelector(".copy-msg");
|
|
flash(msgElem, msg, 100);
|
|
} catch (err) {
|
|
console.log('Oops, unable to copy', err);
|
|
}
|
|
document.body.removeChild(copyTextArea);
|
|
el.setAttribute('data-original-title', elOriginalText);
|
|
} else {
|
|
// Fallback if browser doesn't support .execCommand('copy')
|
|
window.prompt("Copy to clipboard: Ctrl+C or Command+C, Enter", text);
|
|
}
|
|
}
|
|
|
|
function processGraphVizSections(elements) {
|
|
var elements = document.querySelectorAll("[data-viz]");
|
|
var viz = new Viz();
|
|
Array.prototype.forEach.call(elements, function (x) {
|
|
var engine = x.getAttribute("data-viz");
|
|
var image = viz.renderImageElement(x.innerText, {
|
|
format: "png",
|
|
engine: engine
|
|
}).then(function (element) {
|
|
x.parentNode.insertBefore(element, x);
|
|
});
|
|
});
|
|
|
|
|
|
};
|
|
|
|
function updateLanguageParameter(value) {
|
|
const param = "lang";
|
|
|
|
if (window.location.href.indexOf("?") >= 0) {
|
|
const regExp = new RegExp(param + "(.+?)(&|$)", "g");
|
|
const newUrl = window.location.href.replace(regExp, param + "=" + encodeURIComponent(value) + "$2");
|
|
window.history.pushState("", "", newUrl);
|
|
} else {
|
|
const newUrl = window.location.href + "?" + param + "=" + encodeURIComponent(value);
|
|
window.history.pushState("", "", newUrl);
|
|
}
|
|
}
|
|
|
|
function getLanguageParameter() {
|
|
var match = RegExp('[?&]lang=([^&]*)').exec(window.location.search);
|
|
return match && decodeURIComponent(match[1].replace(/\+/g, ' '));
|
|
}
|
|
|
|
function docReady() {
|
|
window.gitbook.events.bind("page.change", function () {
|
|
pageChanged();
|
|
});
|
|
}
|
|
|
|
function pageChanged() {
|
|
var logos = document.querySelectorAll(".nats");
|
|
if (logos && logos.length == 0) {
|
|
gitbook.toolbar.createButton({
|
|
icon: 'nats',
|
|
label: 'NATS Home Page',
|
|
position: 'right',
|
|
onClick: function () {
|
|
var win = window.open("https://nats.io/", '_blank');
|
|
win.focus();
|
|
}
|
|
});
|
|
}
|
|
|
|
document.querySelectorAll('.js-copy').forEach(elem => {
|
|
elem.addEventListener("click", function () {
|
|
var el = this;
|
|
var parent = this.parentNode.parentNode;
|
|
var code = parent.querySelector('code');
|
|
var text = code.textContent || code.innerText;
|
|
copyToClipboard(text, el);
|
|
})
|
|
});
|
|
|
|
document.querySelectorAll('.api-lang').forEach(elem => {
|
|
elem.addEventListener("click", function () {
|
|
var curLang = sessionStorage.getItem('nats-api-language');
|
|
var lang = this.getAttribute('data-language');
|
|
|
|
// Stop the infinite loop
|
|
if (curLang == lang) {
|
|
return;
|
|
}
|
|
|
|
sessionStorage.setItem('nats-api-language', lang); // So we only do this 1x
|
|
|
|
updateLanguageParameter(lang)
|
|
|
|
document.querySelectorAll('.api-lang[data-language=' + lang + ']').forEach(elem => {
|
|
elem.click();
|
|
});
|
|
})
|
|
});
|
|
|
|
if (sessionStorage) {
|
|
var curLang = sessionStorage.getItem('nats-api-language');
|
|
var queryLang = getLanguageParameter();
|
|
var lang = curLang;
|
|
|
|
if (queryLang) { // query takes precedent
|
|
lang = queryLang
|
|
}
|
|
|
|
if (lang) {
|
|
document.querySelectorAll('.api-lang[data-language=' + lang + ']').forEach(elem => {
|
|
elem.click();
|
|
});
|
|
}
|
|
}
|
|
|
|
setTimeout(function () {
|
|
processGraphVizSections();
|
|
}, 1);
|
|
}
|
|
|
|
|
|
if (document.readyState != 'loading') docReady();
|
|
else if (document.addEventListener) document.addEventListener('DOMContentLoaded', docReady);
|
|
else document.attachEvent('onreadystatechange', function () {
|
|
if (document.readyState == 'complete') docReady();
|
|
});
|
|
</script>
|
|
|
|
<!-- Github Buttons -->
|
|
<script async defer src="https://buttons.github.io/buttons.js"></script>
|
|
|
|
<!-- Styles -->
|
|
<style>
|
|
.nats {
|
|
display: inline-block;
|
|
width: 16px;
|
|
height: 16px;
|
|
background: url(https://nats.io/img/nats-icon-color.svg);
|
|
background-size: 16px 16px;
|
|
}
|
|
|
|
div.graphviz {
|
|
background: transparent;
|
|
border: 0;
|
|
padding-top: 15px;
|
|
padding-right: 15px;
|
|
padding-bottom: 25px;
|
|
padding-left: 15px;
|
|
text-align: center;
|
|
}
|
|
|
|
code[data-viz] {
|
|
display: none;
|
|
}
|
|
|
|
.tab-wrap {
|
|
transition: 0.3s box-shadow ease;
|
|
border-radius: 6px;
|
|
max-width: 100%;
|
|
display: flex;
|
|
flex-wrap: wrap;
|
|
position: relative;
|
|
list-style: none;
|
|
background-color: #fff;
|
|
margin: 20px 0;
|
|
/* box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);*/
|
|
}
|
|
|
|
.tab-wrap:hover {
|
|
box-shadow: 0 12px 23px rgba(0, 0, 0, 0.23), 0 10px 10px rgba(0, 0, 0, 0.19);
|
|
}
|
|
|
|
.tab {
|
|
display: none;
|
|
}
|
|
|
|
/* Using scss these would be generated, we have to manually create enough for all tabs, start with 8 */
|
|
.tab:checked:nth-of-type(1)~.tab__content:nth-of-type(1) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(2)~.tab__content:nth-of-type(2) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(3)~.tab__content:nth-of-type(3) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(4)~.tab__content:nth-of-type(4) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(5)~.tab__content:nth-of-type(5) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(6)~.tab__content:nth-of-type(6) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(7)~.tab__content:nth-of-type(7) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(8)~.tab__content:nth-of-type(8) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:first-of-type:not(:last-of-type)+label {
|
|
border-top-right-radius: 0;
|
|
border-bottom-right-radius: 0;
|
|
}
|
|
|
|
.tab:not(:first-of-type):not(:last-of-type)+label {
|
|
border-radius: 0;
|
|
}
|
|
|
|
.tab:last-of-type:not(:first-of-type)+label {
|
|
border-top-left-radius: 0;
|
|
border-bottom-left-radius: 0;
|
|
}
|
|
|
|
.tab:checked+label {
|
|
background-color: #fff;
|
|
box-shadow: 0 -1px 0 #fff inset;
|
|
cursor: default;
|
|
font-weight: bold;
|
|
border: 1px solid #ddd;
|
|
border-bottom-color: transparent;
|
|
}
|
|
|
|
.tab:checked+label:hover {
|
|
box-shadow: 0 -1px 0 #fff inset;
|
|
background-color: #fff;
|
|
}
|
|
|
|
.tab+label {
|
|
box-shadow: 0 -1px 0 #eee inset;
|
|
border-radius: 6px 6px 0 0;
|
|
cursor: pointer;
|
|
display: block;
|
|
text-decoration: none;
|
|
color: #27aae1;
|
|
flex-grow: 3;
|
|
text-align: center;
|
|
-webkit-user-select: none;
|
|
-moz-user-select: none;
|
|
-ms-user-select: none;
|
|
user-select: none;
|
|
text-align: center;
|
|
transition: 0.3s background-color ease, 0.3s box-shadow ease;
|
|
height: 50px;
|
|
box-sizing: border-box;
|
|
padding: 15px;
|
|
}
|
|
|
|
.tab+label:hover {
|
|
background-color: #f9f9f9;
|
|
box-shadow: 0 1px 0 #f4f4f4 inset;
|
|
}
|
|
|
|
.tab__content {
|
|
padding: 2px 2px;
|
|
background-color: transparent;
|
|
position: absolute;
|
|
width: 100%;
|
|
z-index: -1;
|
|
opacity: 0;
|
|
left: 0;
|
|
-webkit-transform: translateY(-3px);
|
|
transform: translateY(-3px);
|
|
border-radius: 6px;
|
|
}
|
|
|
|
.tab__content pre {
|
|
margin-bottom: 0px !important;
|
|
}
|
|
|
|
.toolbar-icons {
|
|
display: inline-block;
|
|
position: relative;
|
|
padding-left: 4px;
|
|
}
|
|
|
|
a.toolbar-icons {
|
|
text-decoration: none;
|
|
}
|
|
|
|
.toolbar-icons .mdi {
|
|
color: #4183c4;
|
|
}
|
|
|
|
.copy-msg {
|
|
color: #4183c4;
|
|
}
|
|
|
|
.pull-right {
|
|
float: right !important;
|
|
}
|
|
|
|
.pull-left {
|
|
float: left !important;
|
|
}
|
|
</style>
|
|
|
|
|
|
<script src="../../gitbook/gitbook.js"></script>
|
|
<script src="../../gitbook/theme.js"></script>
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-toggle-chapters/toggle.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-search/search-engine.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-search/search.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-lunr/lunr.min.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-lunr/search-lunr.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-fontsettings/fontsettings.js"></script>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|
|
|