mirror of
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updating docs
This commit is contained in:
ainsley
@@ -2537,7 +2537,7 @@ msg <span class="token operator">=</span> <span class="token keyword">await</spa
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@@ -2354,16 +2354,17 @@
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<section class="normal markdown-section">
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<h1 id="draining-connections-and-subscriptions"><a name="draining-connections-and-subscriptions" class="plugin-anchor" href="#draining-connections-and-subscriptions"><i class="fa fa-link" aria-hidden="true"></i></a>Draining Connections and Subscriptions</h1>
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<p>A feature recently added across the NATS client libraries is the ability to drain connections or subscriptions. Closing a connection, or unsubscribing from a subscription are generally considered immediate requests. When you close or unsubscribe the library will halt messages in any pending queue or cache for subscribers. When you drain a subscription or connection, it will process any cached/pending messages before closing.</p>
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<p>Drain provides clients that use queue subscriptions with a way to bring down applications without losing any messages. A client can bring up a new queue member, drain and shut down the old queue member, all without losing messages sent to the old client. Without drain, there is the possibility of lost messages due to queue timing.</p>
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<p>A feature recently added across the NATS client libraries is the ability to drain connections or subscriptions. Closing a connection, or unsubscribing from a subscription, are generally considered immediate requests. When you close or unsubscribe the library will halt messages in any pending queue or cache for subscribers. When you drain a subscription or connection, it will process any inflight and cached/pending messages before closing.</p>
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<p>Drain provides clients that use queue subscriptions with a way to bring down applications without losing any messages. A client can bring up a new queue member, drain and shut down the old queue member, all without losing messages sent to the old client. Without drain, there is the possibility of lost messages due to delivery timing.</p>
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<p>The libraries can provide drain on a connection or on a subscriber, or both.</p>
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<p>For a connection the process is essentially:</p>
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<ol>
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<li>Drain subscriptions</li>
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<li>Drain all subscriptions</li>
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<li>Stop new messages from being published</li>
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<li>Flush any remaining messages</li>
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<li>Flush any remaining published messages</li>
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<li>Close</li>
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</ol>
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<p>The API for drain can generally be used instead of close:</p>
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<p>As an example of draining a connection:</p>
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<div class="tab-wrap">
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@@ -2551,8 +2552,8 @@ nc<span class="token punctuation">.</span><span class="token function">close</sp
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</div>
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<p>The mechanics of drain for a subscription are simpler:</p>
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<ol>
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<li>Unsubscribe at the server</li>
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<li>Process known messages</li>
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<li>Unsubscribe</li>
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<li>Process all cached or inflight messages</li>
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<li>Clean up</li>
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</ol>
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<p>The API for drain can generally be used instead of unsubscribe:</p>
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@@ -2765,7 +2766,7 @@ nc<span class="token punctuation">.</span><span class="token function">close</sp
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});
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</script>
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</div>
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@@ -2354,10 +2354,10 @@
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<section class="normal markdown-section">
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<h1 id="receiving-messages"><a name="receiving-messages" class="plugin-anchor" href="#receiving-messages"><i class="fa fa-link" aria-hidden="true"></i></a>Receiving Messages</h1>
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<p>Receiving messages with NATS can be very library dependent.</p>
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<p>In general, applications can receive messages asynchronously or synchronously. Receiving messages with NATS can be library dependent.</p>
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<p>Some languages, like Go or Java, provide synchronous and asynchronous APIs, while others may only support one type of subscription.</p>
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<p>In all cases, the process of subscribing involves having the client library tell the NATS server that an application is interested in a particular subject.</p>
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<p>Under the covers, the client library will assign a unique id to each subscription. This id is used when the server sends messages to a specific subscription. Each subscription gets a unique id, so if the same connection is used multiple times for the same subject, the server will send multiple copies of the same message. When an application is done with a subscription it unsubscribes which tells the server to stop sending messages.</p>
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<p>In all cases, the process of subscribing involves having the client library tell the NATS system that an application is interested in a particular subject.</p>
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<p>Under the covers, the client library will assign a unique id to each subscription. This id is used as a closure when the server sends messages to a specific subscription. Each subscription gets a unique id, so if the same connection is used multiple times for the same subject, the server will send multiple copies of the same message. When an application is done with a subscription it unsubscribes which tells the server to stop sending messages.</p>
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</section>
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@@ -2401,7 +2401,7 @@
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</div>
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@@ -2559,7 +2559,7 @@ msg <span class="token operator">=</span> <span class="token keyword">await</spa
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<script>
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</script>
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</div>
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@@ -2391,7 +2391,7 @@
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<div class="tab__content">
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<pre id="subscribe_w_reply_go_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/go-nats-examples/blob/master/api-examples/subscribe_w_reply/main.go#L11-39"><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>
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<pre id="subscribe_w_reply_go_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/go-nats-examples/blob/master/api-examples/subscribe_w_reply/main.go#L11-35"><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-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>
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<span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">Fatal</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
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<span class="token punctuation">}</span>
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@@ -2414,10 +2414,6 @@ timeAsBytes <span class="token operator">:=</span> <span class="token punctuatio
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<span class="token comment">// Send the time</span>
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nc<span class="token punctuation">.</span><span class="token function">Publish</span><span class="token punctuation">(</span>msg<span class="token punctuation">.</span>Reply<span class="token punctuation">,</span> timeAsBytes<span class="token punctuation">)</span>
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<span class="token comment">// Flush and close the connection</span>
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||||
nc<span class="token punctuation">.</span><span class="token function">Flush</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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nc<span class="token punctuation">.</span><span class="token function">Close</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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</code></pre>
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</div>
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@@ -2559,7 +2555,7 @@ time_as_bytes <span class="token operator">=</span> <span class="token string">&
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||||
<script>
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gitbook.push(function() {
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|
||||
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|
||||
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|
||||
|
||||
@@ -2354,7 +2354,7 @@
|
||||
<section class="normal markdown-section">
|
||||
|
||||
<h1 id="receiving-structured-data"><a name="receiving-structured-data" class="plugin-anchor" href="#receiving-structured-data"><i class="fa fa-link" aria-hidden="true"></i></a>Receiving Structured Data</h1>
|
||||
<p>Client libraries may provide tools to help receive structured data, like JSON. The core traffic to the NATS server will always be byte arrays. For libraries that don't provide helpers, you can always encode and decode data before sending the associated bytes to the NATS client.</p>
|
||||
<p>Client libraries may provide tools to help receive structured data, like JSON. The core traffic to the NATS server will always be opaque byte arrays. The server does not process message payloads in any form. For libraries that don't provide helpers, you can always encode and decode data before sending the associated bytes to the NATS client.</p>
|
||||
<p>For example, to receive JSON you could do:</p>
|
||||
<div class="tab-wrap">
|
||||
|
||||
@@ -2586,7 +2586,7 @@ nc<span class="token punctuation">.</span><span class="token function">subscribe
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|
||||
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|
||||
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|
||||
|
||||
@@ -2354,7 +2354,7 @@
|
||||
<section class="normal markdown-section">
|
||||
|
||||
<h1 id="synchronous-subscriptions"><a name="synchronous-subscriptions" class="plugin-anchor" href="#synchronous-subscriptions"><i class="fa fa-link" aria-hidden="true"></i></a>Synchronous Subscriptions</h1>
|
||||
<p>Synchronous subscriptions require the application to poll for messages. This type of subscription is easy to set-up and use, but requires the application to deal with looping if multiple messages are expected. For situations where a single message is expected, synchronous subscriptions are sometimes easier to manage, depending on the language.</p>
|
||||
<p>Synchronous subscriptions require the application to wait for messages. This type of subscription is easy to set-up and use, but requires the application to deal with looping if multiple messages are expected. For situations where a single message is expected, synchronous subscriptions are sometimes easier to manage, depending on the language.</p>
|
||||
<p>For example, to subscribe to the subject <code>updates</code> and receive a single message you could do:</p>
|
||||
<div class="tab-wrap">
|
||||
|
||||
@@ -2497,7 +2497,7 @@ nc<span class="token punctuation">.</span><span class="token function">close</sp
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@@ -2570,7 +2570,7 @@ sub2<span class="token punctuation">.</span><span class="token function">unsubsc
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@@ -2565,7 +2565,7 @@ sub<span class="token punctuation">.</span><span class="token function">unsubscr
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Reference in New Issue
Block a user