| <!DOCTYPE html> |
| <html lang="en"> |
| <head> |
| <meta charset="UTF-8"> |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> |
| <title>ActiveMQ</title> |
| <link rel="icon" type="image/png" href="/assets/img/favicon.png"> |
| |
| <link rel="stylesheet" href="/css/main.css"> |
| <script defer src="https://use.fontawesome.com/releases/v5.0.8/js/all.js" integrity="sha384-SlE991lGASHoBfWbelyBPLsUlwY1GwNDJo3jSJO04KZ33K2bwfV9YBauFfnzvynJ" crossorigin="anonymous"></script> |
| <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script> |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script> |
| <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script> |
| </head> |
| |
| <body> |
| <nav class="navbar navbar-expand-lg navbar-light fixed-top"> |
| <div class="container"> |
| <!-- <a class="navbar-brand mr-auto" href="#"><img style="height: 50px" src="assets/img/apache-feather.png" /></a> --> |
| <a class="navbar-brand mr-auto" href="/"><img src="/assets/img/activemq_logo_black_small.png" style="height: 50px"/></a> |
| <button class="navbar-toggler ml-auto" type="button" data-toggle="collapse" data-target="#navbarContent" aria-controls="navbarContent" aria-expanded="false" aria-label="Toggle navigation"> |
| <span class="navbar-toggler-icon"></span> |
| </button> |
| |
| <div class="ml-auto collapse navbar-collapse" id="navbarContent"> |
| <ul class="navbar-nav ml-auto"> |
| <li class="nav-item"> |
| <a class="nav-link active" href="/index.html">Home</a> |
| </li> |
| <li class="nav-item dropdown"> |
| <a class="nav-link" id="navbarDropdownComponents" data-target="#" href="" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Components</a> |
| <ul class="dropdown-menu dropdown-menu-center" aria-labelledby="navbarDropdownComponents"> |
| <div class="row"> |
| <div class="col-12"> |
| <ul class="multi-column-dropdown"> |
| <li class="nav-item"><a class="dropdown-item" href="/components/classic">ActiveMQ 5</a></li> |
| <li class="nav-item"><a class="dropdown-item" href="/components/artemis/">ActiveMQ Artemis</a></li> |
| <li class="nav-item"><a class="dropdown-item" href="/components/nms">NMS Clients</a></li> |
| <li class="nav-item"><a class="dropdown-item" href="/components/cms">CMS Client</a></li> |
| </ul> |
| </div> |
| </div> |
| </ul> |
| </li> |
| <li class="nav-item dropdown"> |
| <a class="nav-link" id="navbarDropdownCommunity" data-target="#" href="" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Contact</a> |
| <ul class="dropdown-menu dropdown-menu-center multi-column columns-1" aria-labelledby="navbarDropdownCommunity"> |
| <div class="row"> |
| <div class="col-12"> |
| <ul class="multi-column-dropdown"> |
| <li class="nav-item"><a class="dropdown-item" href="/contact#mailing">Mailing Lists</a></li> |
| <li class="nav-item"><a class="dropdown-item" href="/contact#chat">Chat</a></li> |
| <li class="nav-item"><a class="dropdown-item" href="/contact#issues">Report Issues</a></li> |
| <li class="nav-item"><a class="dropdown-item" href="/contact#contributing">Contributing</a></li> |
| <li class="nav-item"><a class="dropdown-item" href="/security-advisories.html">Security</a></li> |
| </ul> |
| </div> |
| </div> |
| </ul> |
| </li> |
| <li class="nav-item dropdown"> |
| <a class="nav-link" id="navbarDropdownTeam" data-target="#" href="" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Apache</a> |
| <ul class="dropdown-menu dropdown-menu-center multi-column columns-1" aria-labelledby="navbarDropdownTeam"> |
| <div class="row"> |
| <div class="col-sm-12"> |
| <ul class="multi-column-dropdown"> |
| <li class="nav-item"><a class="dropdown-item" href="https://www.apache.org">The Apache Software Foundation</a></li> |
| <li class="nav-item"><a class="dropdown-item" href="https://www.apache.org/licenses/">License</a></li> |
| <li class="nav-item"><a class="dropdown-item" href="https://www.apache.org/foundation/sponsorship.html">Sponsorship</a></li> |
| <li class="nav-item"><a class="dropdown-item" href="https://www.apache.org/foundation/thanks.html">Thanks</a></li> |
| <li class="nav-item"><a class="dropdown-item" href="/security-advisories.html">Security</a></li> |
| <li class="nav-item"><a class="dropdown-item" href="https://www.apache.org/events/current-event">Events</a></li> |
| <li class="nav-item"><a class="dropdown-item" href="https://people.apache.org/phonebook.html?pmc=activemq">PMC & Committers</a></li> |
| <li class="nav-item"><a class="dropdown-item" href="/team/reports">Board Reports</a></li> |
| </ul> |
| </div> |
| </div> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </nav> |
| |
| <div class="content"> |
| <div class="page-title-activemq5"> |
| <div class="container"> |
| <h1>Consumer Dispatch Async</h1> |
| </div> |
| </div> |
| <div class="container" > |
| <div class="row" style="margin-top: 30px"> |
| <div class="col-12 activemq5"> |
| <p><a href="features">Features</a> > <a href="consumer-features">Consumer Features</a> > <a href="consumer-dispatch-async">Consumer Dispatch Async</a></p> |
| |
| <h2 id="overview">Overview</h2> |
| |
| <p>From ActiveMQ v4: the choice of a broker performing synchronous or asynchronous dispatch to a consumer has become more configurable. It is now configured as a default value on the <a href="connection-configuration-uri">connection URI, Connection and ConnectionFactory</a> as well as with being customizable on a per consumer basis via the <a href="destination-options">Destination Options</a> instead previously just being a transport server setting.</p> |
| |
| <p>This makes more sense since you want to do asynchronous message delivery to slower consumers, but synchronous message delivery for faster consumers (to avoid the synchronization and context switching costs of adding another SEDA queue). The downside to using synchronous message delivery is that the producer is more likely to block if there is a slow consumer that he is dispatching messages to.</p> |
| |
| <p>The default setting is <code class="highlighter-rouge">dispatchAsync=true</code> which is the best setting for high performance. If you want to deal better with slow consumers you will want to enable this setting. If you want better throughput and the chances of having a slow consumer are low, you may want to change this to <code class="highlighter-rouge">dispatchAsync=false</code>.</p> |
| |
| <h3 id="configuring-async-dispatch-at-the-connectionfactory-level">Configuring Async Dispatch at the ConnectionFactory Level</h3> |
| <div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>((ActiveMQConnectionFactory)connectionFactory).setDispatchAsync(false); |
| </code></pre></div></div> |
| |
| <h3 id="configuring-dispatch-async-at-the-connection-level">Configuring Dispatch Async at the Connection Level</h3> |
| |
| <p>Configuring the <code class="highlighter-rouge">dispatchAsync</code> setting at this level overrides the settings at the connection factory level.</p> |
| |
| <h3 id="configuring-dispatch-async-at-the-consumer-level-using-the-destination-uri">Configuring Dispatch Async at the Consumer Level using the Destination URI</h3> |
| |
| <p>Configuring the <code class="highlighter-rouge">dispatchAsync</code> using <a href="destination-options">Destination Options</a> overrides the settings at the connection and connection factory level.</p> |
| <div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>queue = new ActiveMQQueue("TEST.QUEUE?consumer.dispatchAsync=false"); |
| consumer = session.createConsumer(queue); |
| </code></pre></div></div> |
| |
| <h3 id="disabling-async-dispatch-on-brokers-transport-connector">Disabling Async Dispatch on Broker’s Transport Connector</h3> |
| |
| <p>It is possible to disable async dispatch on a specific transport connector via the <code class="highlighter-rouge">disableAsyncDispatch</code> property. Once disabled for this transport, it cannot be enabled by individual clients.</p> |
| <div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code><transportConnector name="openwire" uri="tcp://0.0.0.0:61616" disableAsyncDispatch="true"/> |
| </code></pre></div></div> |
| |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="row sitemap"> |
| <div class="col-sm-12"> |
| <div class="container"> |
| <div class="row"> |
| <div class="col-sm-12"> |
| <div class="row"> |
| <div class="col-sm-3"> |
| <div > |
| <img class="float-left" style="max-height: 100px" src="/assets/img/activemq_logo_white_vertical_small.png"/> |
| </div> |
| </div> |
| <div style="text-align: center; margin-bottom: 0px; margin-top: 30px; font-size: 65%" class="col-sm-6"> |
| <p>Apache ActiveMQ, ActiveMQ, ActiveMQ Artemis, Apache, the Apache feather logo, and the Apache ActiveMQ project logo are trademarks of The Apache Software Foundation. Copyright © 2019, The Apache Software Foundation. Licensed under <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License 2.0</a>.</p> |
| </div> |
| <div class="col-sm-3"> |
| <div > |
| <a href="https://www.apache.org"><img class="float-right" style="margin-top: 10px; max-height: 80px" src="/assets/img/apache-logo-small.png"/></a> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
| |
| </body> |
| </html> |
