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<title>Receiving Messages from a Channel ยท NATS</title>
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<li class="chapter " data-level="1.1" data-path="../../">
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Introduction
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What's New in 2.0
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<li class="header">Concepts</li>
<li class="chapter " data-level="2.1" data-path="../concepts/intro.html">
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What is NATS
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<li class="chapter " data-level="2.2" data-path="../concepts/subjects.html">
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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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Sequence Numbers
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<li class="header">Developing With NATS</li>
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Introduction
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Connecting
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Connecting to the Default Server
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Connecting to a Specific Server
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Connecting to a Cluster
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Setting a Connect Timeout
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Ping/Pong Protocol
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Controlling the Client/Server Protocol
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Turning Off Echo'd Messages
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<li class="chapter " data-level="3.3" data-path="../reconnect/intro.html">
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Automatic Reconnections
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Disabling Reconnect
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Set the Number of Reconnect Attempts
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Pausing Between Reconnect Attempts
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Avoiding the Thundering Herd
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Listening for Reconnect Events
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Buffering Messages During Reconnect Attempts
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Securing Connections
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Authenticating with a User and Password
</a>
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<a href="../security/token.html">
Authenticating with a Token
</a>
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Authenticating with an NKey
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Authenticating with a Credentials File
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Encrypting Connections with TLS
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<li class="chapter " data-level="3.5" data-path="../receiving/intro.html">
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Receiving Messages
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Synchronous Subscriptions
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Asynchronous Subscriptions
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<li class="chapter " data-level="3.5.3" data-path="../receiving/unsubscribing.html">
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Unsubscribing
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<li class="chapter " data-level="3.5.4" data-path="../receiving/unsub_after.html">
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Unsubscribing After N Messages
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<li class="chapter " data-level="3.5.5" data-path="../receiving/reply.html">
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Replying to a Message
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<li class="chapter " data-level="3.5.6" data-path="../receiving/wildcards.html">
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Wildcard Subscriptions
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<li class="chapter " data-level="3.5.7" data-path="../receiving/queues.html">
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Queue Subscriptions
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<li class="chapter " data-level="3.5.8" data-path="../receiving/drain.html">
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Draining Messages Before Disconnect
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<li class="chapter " data-level="3.5.9" data-path="../receiving/structure.html">
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Structured Data
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<li class="chapter " data-level="3.6" data-path="../sending/intro.html">
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Sending Messages
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<li class="chapter " data-level="3.6.1" data-path="../sending/replyto.html">
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Including a Reply Subject
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Request-Reply Semantics
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Caches, Flush and Ping
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Sending Structured Data
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<li class="chapter " data-level="3.7" data-path="../events/intro.html">
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Monitoring the Connection
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<li class="chapter " data-level="3.7.1" data-path="../events/events.html">
<a href="../events/events.html">
Listen for Connection Events
</a>
</li>
<li class="chapter " data-level="3.7.2" data-path="../events/slow.html">
<a href="../events/slow.html">
Slow Consumers
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="3.8" data-path="../tutorials/intro.html">
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Tutorials
</a>
<ul class="articles">
<li class="chapter " data-level="3.8.1" data-path="../tutorials/pubsub.html">
<a href="../tutorials/pubsub.html">
Explore NATS Pub/Sub
</a>
</li>
<li class="chapter " data-level="3.8.2" data-path="../tutorials/reqreply.html">
<a href="../tutorials/reqreply.html">
Explore NATS Request/Reply
</a>
</li>
<li class="chapter " data-level="3.8.3" data-path="../tutorials/queues.html">
<a href="../tutorials/queues.html">
Explore NATS Queueing
</a>
</li>
<li class="chapter " data-level="3.8.4" data-path="../tutorials/custom_dialer.html">
<a href="../tutorials/custom_dialer.html">
Advanced Connect and Custom Dialer in Go
</a>
</li>
</ul>
</li>
<li class="header">NATS Server</li>
<li class="chapter " data-level="4.1" data-path="../../nats_server/installation.html">
<a href="../../nats_server/installation.html">
Installing
</a>
</li>
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<a href="../../nats_server/running.html">
Running
</a>
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<a href="../../nats_server/windows_srv.html">
Window Service
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<a href="../../nats_server/clients.html">
Clients
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Flags
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Configuration
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<a href="../../nats_server/securing_nats.html">
Securing NATS
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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
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Authentication
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Tokens
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<a href="../../nats_server/username_password.html">
Username/Password
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TLS Authentication
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<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
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<li class="chapter " data-level="4.5.1.2.5" data-path="../../nats_server/accounts.html">
<a href="../../nats_server/accounts.html">
Accounts
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<a href="../../nats_server/jwt_auth.html">
JWTs
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<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/">
<a href="../../nats_tools/nats_top/">
nats-top
</a>
<ul class="articles">
<li class="chapter " data-level="5.5.1" data-path="../../nats_tools/nats_top/tutorial.html">
<a href="../../nats_tools/nats_top/tutorial.html">
Tutorial
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="5.6" data-path="../../nats_tools/natsbench.html">
<a href="../../nats_tools/natsbench.html">
nats-bench
</a>
</li>
<li class="header">NATS Streaming Concepts</li>
<li class="chapter " data-level="6.1" data-path="../../nats_streaming/intro.html">
<a href="../../nats_streaming/intro.html">
Introduction
</a>
<ul class="articles">
<li class="chapter " data-level="6.1.1" data-path="../../nats_streaming/relation-to-nats.html">
<a href="../../nats_streaming/relation-to-nats.html">
Relation to NATS
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="6.2" data-path="../../nats_streaming/client-connections.html">
<a href="../../nats_streaming/client-connections.html">
Client Connections
</a>
</li>
<li class="chapter " data-level="6.3" data-path="../../nats_streaming/channels/channels.html">
<a href="../../nats_streaming/channels/channels.html">
Channels
</a>
<ul class="articles">
<li class="chapter " data-level="6.3.1" data-path="../../nats_streaming/channels/message-log.html">
<a href="../../nats_streaming/channels/message-log.html">
Message Log
</a>
</li>
<li class="chapter " data-level="6.3.2" data-path="../../nats_streaming/channels/subscriptions/subscriptions.html">
<a href="../../nats_streaming/channels/subscriptions/subscriptions.html">
Subscriptions
</a>
<ul class="articles">
<li class="chapter " data-level="6.3.2.1" data-path="../../nats_streaming/channels/subscriptions/regular.html">
<a href="../../nats_streaming/channels/subscriptions/regular.html">
Regular
</a>
</li>
<li class="chapter " data-level="6.3.2.2" data-path="../../nats_streaming/channels/subscriptions/durable.html">
<a href="../../nats_streaming/channels/subscriptions/durable.html">
Durable
</a>
</li>
<li class="chapter " data-level="6.3.2.3" data-path="../../nats_streaming/channels/subscriptions/queue-group.html">
<a href="../../nats_streaming/channels/subscriptions/queue-group.html">
Queue Group
</a>
</li>
<li class="chapter " data-level="6.3.2.4" data-path="../../nats_streaming/channels/subscriptions/redelivery.html">
<a href="../../nats_streaming/channels/subscriptions/redelivery.html">
Redelivery
</a>
</li>
</ul>
</li>
</ul>
</li>
<li class="chapter " data-level="6.4" data-path="../../nats_streaming/store-interface.html">
<a href="../../nats_streaming/store-interface.html">
Store Interface
</a>
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<h1 id="receiving-messages-from-a-channel"><a name="receiving-messages-from-a-channel" class="plugin-anchor" href="#receiving-messages-from-a-channel"><i class="fa fa-link" aria-hidden="true"></i></a>Receiving Messages from a Channel</h1>
<p>Clients subscribe to channels by name. Wildcards are not supported. Receiving messages is similar to core NATS. Messages in streaming use protocol buffers and will have a bit more structure than NATS opaque messages. Client messages are still presented and accepted as raw/opaque binary data. The use of protocol buffers is transparent.</p>
<p>Subscriptions come in several forms:</p>
<ul>
<li>Regular</li>
<li>Durable</li>
<li>Queue</li>
<li>Queue/Durable</li>
</ul>
<p>For more details on the various types, check the <a href="../../nats_streaming/channels/subscriptions/subscriptions.html">concepts</a> section.</p>
<p><strong><em>Note: message callbacks are invoked serially, one message at a time. If your application does not care about processing ordering and would prefer the messages to be dispatched concurrently, it is the application responsibility to move them to some internal queue to be picked up by threads/go routines.</em></strong></p>
<p>Subscriptions set their starting position on creation using position or time. For example, in Go you can start at:</p>
<ul>
<li>The last message received</li>
</ul>
<pre class="language-"><code class="lang-go">sub<span class="token punctuation">,</span> err <span class="token operator">:=</span> sc<span class="token punctuation">.</span><span class="token function">Subscribe</span><span class="token punctuation">(</span><span class="token string">&quot;foo&quot;</span><span class="token punctuation">,</span>
<span class="token keyword">func</span><span class="token punctuation">(</span>m <span class="token operator">*</span>stan<span class="token punctuation">.</span>Msg<span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token operator">...</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
stan<span class="token punctuation">.</span><span class="token function">StartWithLastReceived</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
</code></pre>
<ul>
<li>The beginning of the channel</li>
</ul>
<pre class="language-"><code class="lang-go">sub<span class="token punctuation">,</span> err <span class="token operator">:=</span> sc<span class="token punctuation">.</span><span class="token function">Subscribe</span><span class="token punctuation">(</span><span class="token string">&quot;foo&quot;</span><span class="token punctuation">,</span>
<span class="token keyword">func</span><span class="token punctuation">(</span>m <span class="token operator">*</span>stan<span class="token punctuation">.</span>Msg<span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token operator">...</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
stan<span class="token punctuation">.</span><span class="token function">DeliverAllAvailable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
</code></pre>
<ul>
<li>A specific message, indexing starts at 1</li>
</ul>
<pre class="language-"><code class="lang-go">sub<span class="token punctuation">,</span> err <span class="token operator">:=</span> sc<span class="token punctuation">.</span><span class="token function">Subscribe</span><span class="token punctuation">(</span><span class="token string">&quot;foo&quot;</span><span class="token punctuation">,</span>
<span class="token keyword">func</span><span class="token punctuation">(</span>m <span class="token operator">*</span>stan<span class="token punctuation">.</span>Msg<span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token operator">...</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
stan<span class="token punctuation">.</span><span class="token function">StartAtSequence</span><span class="token punctuation">(</span><span class="token number">22</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
</code></pre>
<ul>
<li>A specific time the message arrived in the channel</li>
</ul>
<pre class="language-"><code class="lang-go"><span class="token keyword">var</span> startTime time<span class="token punctuation">.</span>Time
<span class="token operator">...</span>
sub<span class="token punctuation">,</span> err <span class="token operator">:=</span> sc<span class="token punctuation">.</span><span class="token function">Subscribe</span><span class="token punctuation">(</span><span class="token string">&quot;foo&quot;</span><span class="token punctuation">,</span>
<span class="token keyword">func</span><span class="token punctuation">(</span>m <span class="token operator">*</span>stan<span class="token punctuation">.</span>Msg<span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token operator">...</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
stan<span class="token punctuation">.</span><span class="token function">StartAtTime</span><span class="token punctuation">(</span>startTime<span class="token punctuation">)</span><span class="token punctuation">)</span>
</code></pre>
<p>To set the delay after which the server should attempt to redeliver a message for which it has not receive an acknowledgment:</p>
<pre class="language-"><code class="lang-go">sub<span class="token punctuation">,</span> err <span class="token operator">:=</span> sc<span class="token punctuation">.</span><span class="token function">Subscribe</span><span class="token punctuation">(</span><span class="token string">&quot;foo&quot;</span><span class="token punctuation">,</span>
<span class="token keyword">func</span><span class="token punctuation">(</span>m <span class="token operator">*</span>stan<span class="token punctuation">.</span>Msg<span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token operator">...</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
stan<span class="token punctuation">.</span><span class="token function">AckWait</span><span class="token punctuation">(</span><span class="token number">20</span><span class="token operator">*</span>time<span class="token punctuation">.</span>Second<span class="token punctuation">)</span><span class="token punctuation">)</span>
</code></pre>
<p>When an application wishes to stop receiving, but want to maintain the connection opened, the subscription should be closed. There are two ways to stop a subscription, either &quot;close&quot; it, or &quot;unsubscribe&quot; it. For non durable subscriptions, this is equivalent since the subscription will be completely removed. For durable subscriptions, close means that the server will stop delivering, but remember the durable subscription. Unsubscribe, however, means that the server will remove the state of this subscription.</p>
<p>To simply close:</p>
<pre class="language-"><code class="lang-go">err <span class="token operator">:=</span> sub<span class="token punctuation">.</span><span class="token function">Close</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
</code></pre>
<p>To unsubscribe:</p>
<pre class="language-"><code class="lang-go">err <span class="token operator">:=</span> sub<span class="token punctuation">.</span><span class="token function">Unsubscribe</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
</code></pre>
<p><em>Note: If a connection is closed without explicitly closing the subscriptions, the subscriptions are implicitly closed, not unsubscribed.</em></p>
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.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>
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