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| <a href="/docs/2.11.1/services/services" class='' >Using Ignite Services</a> |
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| <li> |
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| <a href="/docs/2.11.1/perf-and-troubleshooting/yardstick-benchmarking" |
| class='' |
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| <article data-swiftype-index='true'> |
| <a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/messaging.adoc" target="_blank">Edit</a> |
| |
| <h1>Topic-Based Messaging With Apache Ignite</h1> |
| |
| <div class="sect1"> |
| <h2 id="overview">Overview</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Ignite distributed messaging enables topic-based cluster-wide communication between all nodes. Messages via a specified |
| message topic can be distributed to all or sub-group of nodes that have subscribed to that topic.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Ignite messaging is based on the publish-subscribe paradigm where publishers and subscribers are tethered together with |
| a common topic. When one of the nodes sends a message <code>A</code> for topic <code>T</code>, it is published on all nodes that have subscribed to <code>T</code>.</p> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <div class="title">Note</div> |
| </td> |
| <td class="content"> |
| <div class="paragraph"> |
| <p>Any new node joining the cluster automatically gets subscribed to all the topics that other nodes in the cluster |
| (or <a href="/docs/2.11.1/distributed-computing/cluster-groups">cluster group</a>) are subscribed to.</p> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="ignitemessaging">IgniteMessaging</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Distributed messaging functionality in Ignite is available via the <code>IgniteMessaging</code> interface. You can get an instance |
| of <code>IgniteMessaging</code> like so:</p> |
| </div> |
| <code-tabs><code-tab data-tab='Java'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="java"><span class="nc">Ignite</span> <span class="n">ignite</span> <span class="o">=</span> <span class="nc">Ignition</span><span class="o">.</span><span class="na">ignite</span><span class="o">();</span> |
| |
| <span class="c1">// Messaging instance over this cluster.</span> |
| <span class="nc">IgniteMessaging</span> <span class="n">msg</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">message</span><span class="o">();</span> |
| |
| <span class="c1">// Messaging instance over given cluster group (in this case, remote nodes).</span> |
| <span class="nc">IgniteMessaging</span> <span class="n">rmtMsg</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">message</span><span class="o">(</span><span class="n">ignite</span><span class="o">.</span><span class="na">cluster</span><span class="o">().</span><span class="na">forRemotes</span><span class="o">());</span></code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="publish-messages">Publish Messages</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Send methods help sending/publishing messages with a specified message topic to all nodes. Messages can be sent |
| in <em>ordered</em> or <em>unordered</em> manner.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="ordered-messages">Ordered Messages</h3> |
| <div class="paragraph"> |
| <p>The <code>sendOrdered(…​)</code> method can be used if you want to receive messages in the order they were sent. The timeout parameter |
| is passed to specify how long a message will stay in the queue to wait for messages that are supposed to be sent before |
| this message. If the timeout expires, then all the messages that have not yet arrived for a given topic on that node will be ignored.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="unordered-messages">Unordered Messages</h3> |
| <div class="paragraph"> |
| <p>The <code>send(…​)</code> methods do not guarantee message ordering. This means that, when you sequentially send message <code>A</code> and |
| message <code>B</code>, you are not guaranteed that the target node first receives <code>A</code> and then <code>B</code>.</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="subscribe-for-messages">Subscribe for Messages</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Listen methods help to listen/subscribe for messages. When these methods are called, a listener with specified message |
| topic is registered on all (or sub-group of ) nodes to listen for new messages. With listen methods, a predicate is |
| passed that returns a boolean value which tells the listener to continue or stop listening for new messages.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="local-listen">Local Listen</h3> |
| <div class="paragraph"> |
| <p>The <code>localListen(…​)</code> method registers a message listener with specified topic only on the local node and listens for |
| messages from any node in the <em>given</em> cluster group.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="remote-listen">Remote Listen</h3> |
| <div class="paragraph"> |
| <p>The <code>remoteListen(…​)</code> method registers message listeners with specified topic on all nodes in the <em>given</em> cluster group |
| and listens for messages from any node in <em>this</em> cluster group.</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="example">Example</h2> |
| <div class="sectionbody"> |
| <code-tabs><code-tab data-tab='Java'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="java"><span class="nc">Ignite</span> <span class="n">ignite</span> <span class="o">=</span> <span class="nc">Ignition</span><span class="o">.</span><span class="na">ignite</span><span class="o">();</span> |
| |
| <span class="nc">IgniteMessaging</span> <span class="n">rmtMsg</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">message</span><span class="o">(</span><span class="n">ignite</span><span class="o">.</span><span class="na">cluster</span><span class="o">().</span><span class="na">forRemotes</span><span class="o">());</span> |
| |
| <span class="c1">// Add listener for ordered messages on all remote nodes.</span> |
| <span class="n">rmtMsg</span><span class="o">.</span><span class="na">remoteListen</span><span class="o">(</span><span class="s">"MyOrderedTopic"</span><span class="o">,</span> <span class="o">(</span><span class="n">nodeId</span><span class="o">,</span> <span class="n">msg</span><span class="o">)</span> <span class="o">-></span> <span class="o">{</span> |
| <span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">"Received ordered message [msg="</span> <span class="o">+</span> <span class="n">msg</span> <span class="o">+</span> <span class="s">", from="</span> <span class="o">+</span> <span class="n">nodeId</span> <span class="o">+</span> <span class="sc">']'</span><span class="o">);</span> |
| |
| <span class="k">return</span> <span class="kc">true</span><span class="o">;</span> <span class="c1">// Return true to continue listening.</span> |
| <span class="o">});</span> |
| |
| <span class="c1">// Send ordered messages to remote nodes.</span> |
| <span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="o">;</span> <span class="n">i</span> <span class="o"><</span> <span class="mi">10</span><span class="o">;</span> <span class="n">i</span><span class="o">++)</span> |
| <span class="n">rmtMsg</span><span class="o">.</span><span class="na">sendOrdered</span><span class="o">(</span><span class="s">"MyOrderedTopic"</span><span class="o">,</span> <span class="nc">Integer</span><span class="o">.</span><span class="na">toString</span><span class="o">(</span><span class="n">i</span><span class="o">),</span><span class="mi">0</span><span class="o">);</span></code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| </div> |
| </div> |
| <div class="copyright"> |
| © 2022 The Apache Software Foundation.<br/> |
| Apache, Apache Ignite, the Apache feather and the Apache Ignite logo are either registered trademarks or trademarks of The Apache Software Foundation. |
| |
| </div> |
| |
| </article> |
| <nav class="right-nav" data-swiftype-index='false'> |
| <div class="toc-wrapper"> |
| <ul class="sectlevel1"> |
| <li><a href="#overview">Overview</a></li> |
| <li><a href="#ignitemessaging">IgniteMessaging</a></li> |
| <li><a href="#publish-messages">Publish Messages</a> |
| <ul class="sectlevel2"> |
| <li><a href="#ordered-messages">Ordered Messages</a></li> |
| <li><a href="#unordered-messages">Unordered Messages</a></li> |
| </ul> |
| </li> |
| <li><a href="#subscribe-for-messages">Subscribe for Messages</a> |
| <ul class="sectlevel2"> |
| <li><a href="#local-listen">Local Listen</a></li> |
| <li><a href="#remote-listen">Remote Listen</a></li> |
| </ul> |
| </li> |
| <li><a href="#example">Example</a></li> |
| </ul> |
| </div> |
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