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<title>Buffering Messages During Reconnect Attempts ยท NATS</title>
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Introduction
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What's New in 2.0
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FAQ
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<li class="header">Concepts</li>
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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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Sequence Numbers
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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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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
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Authenticating with a Token
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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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Receiving Messages
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Synchronous Subscriptions
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Asynchronous Subscriptions
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Unsubscribing
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Unsubscribing After N Messages
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Replying to a Message
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Wildcard Subscriptions
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Queue Subscriptions
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Draining Messages Before Disconnect
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Structured Data
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Sending Messages
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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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Monitoring the Connection
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Listen for Connection Events
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Slow Consumers
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Tutorials
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Explore NATS Pub/Sub
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Explore NATS Request/Reply
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Explore NATS Queueing
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Advanced Connect and Custom Dialer in Go
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<li class="header">NATS Server</li>
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Installing
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Running
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Window Service
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Clients
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Flags
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Configuration
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Securing NATS
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Enabling TLS
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Authentication
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Tokens
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Username/Password
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TLS Authentication
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NKeys
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Accounts
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JWTs
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Authentication Timeout
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Authorization
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Clustering
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<a href="../../nats_server/cluster_config.html">
Configuration
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<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
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<li class="chapter " data-level="4.5.3" data-path="../../gateways/">
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Gateways
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<a href="../../gateways/gateway.html">
Configuration
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Leaf Nodes
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Configuration
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<a href="../../nats_server/logging.html">
Logging
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<a href="../../nats_server/monitoring.html">
Monitoring
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<li class="chapter " data-level="4.6" data-path="../../nats_admin/">
<a href="../../nats_admin/">
Managing A NATS Server
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<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
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<a href="../../nats_admin/signals.html">
Signals
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<a href="../../sys_accounts/">
System Accounts
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<li class="chapter " data-level="4.6.4.1" data-path="../../sys_accounts/sys_accounts.html">
<a href="../../sys_accounts/sys_accounts.html">
Configuration
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</li>
</ul>
</li>
</ul>
</li>
<li class="chapter " data-level="4.7" data-path="../../nats_docker/">
<a href="../../nats_docker/">
NATS and Docker
</a>
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<li class="chapter " data-level="4.7.1" data-path="../../nats_docker/tutorial.html">
<a href="../../nats_docker/tutorial.html">
Tutorial
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<li class="chapter " data-level="4.7.2" data-path="../../nats_docker/docker_swarm.html">
<a href="../../nats_docker/docker_swarm.html">
Docker Swarm
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</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
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<li class="chapter " data-level="5.3" data-path="../../nats_tools/nsc/">
<a href="../../nats_tools/nsc/">
nsc
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<li class="chapter " data-level="5.3.1" data-path="../../nats_tools/nsc/nsc.html">
<a href="../../nats_tools/nsc/nsc.html">
Basics
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<li class="chapter " data-level="5.3.2" data-path="../../nats_tools/nsc/streams.html">
<a href="../../nats_tools/nsc/streams.html">
Streams
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<li class="chapter " data-level="5.3.3" data-path="../../nats_tools/nsc/services.html">
<a href="../../nats_tools/nsc/services.html">
Services
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</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
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<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
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</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/dir_store.html">
<a href="../../nats_tools/nas/dir_store.html">
Directory Store
</a>
</li>
<li class="chapter " data-level="5.4.4" 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
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<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
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</li>
</ul>
</li>
<li class="chapter " data-level="5.6" data-path="../../nats_tools/natsbench.html">
<a href="../../nats_tools/natsbench.html">
nats-bench
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</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>
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<h1 id="buffering-messages-during-reconnect-attempts"><a name="buffering-messages-during-reconnect-attempts" class="plugin-anchor" href="#buffering-messages-during-reconnect-attempts"><i class="fa fa-link" aria-hidden="true"></i></a>Buffering Messages During Reconnect Attempts</h1>
<p>The NATS client libraries, try as much as possible to be fire and forget. One of the features that may be included in the library you are using is the ability to buffer outgoing messages when the connection is down.</p>
<p>During a short reconnect, these client can allow applications to publish messages that, because the server is offline, will be cached in the client. The library will then send those messages on reconnect. When the maximum reconnect buffer is reached, messages will no longer be publishable by the client.</p>
<p>Be aware, while the message appears to be sent to the application it is possible that it is never sent because the connection is never remade. Your applications should use patterns like acknowledgements to insure delivery.</p>
<p>For clients that support this feature, you are able to configure the size of this buffer with bytes, messages or both.</p>
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<pre id="reconnect_5mb_go_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/go-nats-examples/blob/master/api-examples/reconnect_5mb/main.go#L10-20"><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"><span class="token comment">// Set reconnect buffer size in bytes (5 MB)</span>
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">&quot;demo.nats.io&quot;</span><span class="token punctuation">,</span> nats<span class="token punctuation">.</span><span class="token function">ReconnectBufSize</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token operator">*</span><span class="token number">1024</span><span class="token operator">*</span><span class="token number">1024</span><span class="token punctuation">)</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">// Do something with the connection</span>
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<pre id="reconnect_5mb_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/ReconnectFiveMB.java#L11-21"><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-java"><span class="token class-name">Options</span> options <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Options</span><span class="token punctuation">.</span><span class="token class-name">Builder</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span>
<span class="token function">server</span><span class="token punctuation">(</span><span class="token string">&quot;nats://demo.nats.io:4222&quot;</span><span class="token punctuation">)</span><span class="token punctuation">.</span>
<span class="token function">reconnectBufferSize</span><span class="token punctuation">(</span><span class="token number">5</span> <span class="token operator">*</span> <span class="token number">1024</span> <span class="token operator">*</span> <span class="token number">1024</span><span class="token punctuation">)</span><span class="token punctuation">.</span> <span class="token comment">// Set buffer in bytes</span>
<span class="token function">build</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<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>options<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Do something with 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>
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<pre id="reconnect_5mb_js_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/node-nats-examples/blob/master/src/reconnect_samples.js#L94-96"><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 comment">// Reconnect buffer size is not configurable on node-nats</span>
</code></pre>
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<pre id="reconnect_5mb_py_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/asyncio-nats-examples/blob/master/notapplicable.txt#L1-3"><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"><span class="token comment"># Asyncio NATS client currentply does not implement a reconnect buffer</span>
</code></pre>
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<pre id="reconnect_5mb_ruby_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ruby-nats-examples/blob/master/notapplicable.txt#L1-3"><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 comment"># There is currently no reconnect pending buffer as part of the Ruby NATS client.</span>
</code></pre>
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<pre id="reconnect_5mb_ts_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ts-nats-examples/blob/master/src/reconnect_samples.ts#L76-78"><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 comment">// Reconnect buffer size is not configurable on ts-nats</span>
</code></pre>
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<blockquote>
<p><em>As mentioned throughout this document, each client library may behave slightly differently. Please check the documentation for the library you are using.</em></p>
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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>
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