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+<p>Last-Value queues are special queues which discard any messages when a +newer message with the same value for a well-defined Last-Value property +is put in the queue. In other words, a Last-Value queue only retains the +last value.</p> +<p>A typical example for Last-Value queue is for stock prices, where you +are only interested by the latest value for a particular stock.</p> +<h2 id="configuring-last-value-queues">Configuring Last-Value Queues</h2> +<p>Last-value queues are defined in the address-setting configuration:</p> +<pre><code><address-setting match="lastValueQueue"> + <last-value-queue>true</last-value-queue> +</address-setting> +</code></pre><p>By default, <code>last-value-queue</code> is false. Address wildcards can be used +to configure Last-Value queues for a set of addresses (see <a href="wildcard-syntax.html">here</a>).</p> +<h2 id="using-last-value-property">Using Last-Value Property</h2> +<p>The property name used to identify the last value is <code>"_AMQ_LVQ_NAME"</code> +(or the constant <code>Message.HDR_LAST_VALUE_NAME</code> from the Core API).</p> +<p>For example, if two messages with the same value for the Last-Value +property are sent to a Last-Value queue, only the latest message will be +kept in the queue:</p> +<pre><code class="lang-java"><span class="hljs-comment">// send 1st message with Last-Value property set to STOCK_NAME</span> +TextMessage message = session.createTextMessage(<span class="hljs-string">"1st message with Last-Value property set"</span>); +message.setStringProperty(<span class="hljs-string">"_AMQ_LVQ_NAME"</span>, <span class="hljs-string">"STOCK_NAME"</span>); +producer.send(message); + +<span class="hljs-comment">// send 2nd message with Last-Value property set to STOCK_NAME</span> +message = session.createTextMessage(<span class="hljs-string">"2nd message with Last-Value property set"</span>); +message.setStringProperty(<span class="hljs-string">"_AMQ_LVQ_NAME"</span>, <span class="hljs-string">"STOCK_NAME"</span>); +producer.send(message); + +... + +<span class="hljs-comment">// only the 2nd message will be received: it is the latest with</span> +<span class="hljs-comment">// the Last-Value property set</span> +TextMessage messageReceived = (TextMessage)messageConsumer.receive(<span class="hljs-number">5000</span>); +System.out.format(<span class="hljs-string">"Received message: %s\n"</span>, messageReceived.getText()); +</code></pre> +<h2 id="example">Example</h2> +<p>See the <a href="examples.html">examples</a> chapter for an example which shows how last value queues are configured +and used with JMS.</p> + + + </section> + + </div> + <div class="search-results"> + <div class="has-results"> + + <h1 class="search-results-title"><span class='search-results-count'></span> results matching "<span class='search-query'></span>"</h1> + <ul class="search-results-list"></ul> + + </div> + <div class="no-results"> + + <h1 class="search-results-title">No results matching "<span class='search-query'></span>"</h1> + + </div> + </div> +</div> + + </div> + </div> + + </div> + + + + <a href="scheduled-messages.html" class="navigation navigation-prev " aria-label="Previous page: Scheduled Messages"> + <i class="fa fa-angle-left"></i> + </a> + + + <a href="message-grouping.html" class="navigation navigation-next " aria-label="Next page: Message Grouping"> + <i class="fa fa-angle-right"></i> + </a> + + + + </div> + + <script> + var gitbook = gitbook || []; 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<a href="./"> + + + Introduction + + </a> + + + + </li> + + <li class="chapter " data-level="1.2" data-path="notice.html"> + + <a href="notice.html"> + + + Legal Notice + + </a> + + + + </li> + + <li class="chapter " data-level="1.3" data-path="preface.html"> + + <a href="preface.html"> + + + Preface + + </a> + + + + </li> + + <li class="chapter " data-level="1.4" data-path="project-info.html"> + + <a href="project-info.html"> + + + Project Info + + </a> + + + + </li> + + <li class="chapter " data-level="1.5" data-path="messaging-concepts.html"> + + <a href="messaging-concepts.html"> + + + Messaging Concepts + + </a> + + + + </li> + + <li class="chapter " data-level="1.6" data-path="architecture.html"> + + <a href="architecture.html"> + + + Architecture + + </a> + + + + </li> + + <li class="chapter " data-level="1.7" data-path="using-server.html"> + + <a href="using-server.html"> + + + Using the Server + + </a> + + + + </li> + + <li class="chapter " data-level="1.8" 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</a> + + + + </li> + + <li class="chapter " data-level="1.15" data-path="wildcard-routing.html"> + + <a href="wildcard-routing.html"> + + + Routing Messages With Wild Cards + + </a> + + + + </li> + + <li class="chapter " data-level="1.16" data-path="wildcard-syntax.html"> + + <a href="wildcard-syntax.html"> + + + Understanding the Apache ActiveMQ Artemis Wildcard Syntax + + </a> + + + + </li> + + <li class="chapter " data-level="1.17" data-path="filter-expressions.html"> + + <a href="filter-expressions.html"> + + + Filter Expressions + + </a> + + + + </li> + + <li class="chapter " data-level="1.18" data-path="persistence.html"> + + <a href="persistence.html"> + + + Persistence + + </a> + + + + </li> + + <li class="chapter " data-level="1.19" data-path="configuring-transports.html"> + + <a href="configuring-transports.html"> + + + Configuring Transports + + </a> + + + + </li> + + <li class="chapter " data-level="1.20" data-path="config-reload.html"> + + <a href="config-reload.html"> + + + Configuration Reload + + </a> + + + + </li> + + <li class="chapter " data-level="1.21" data-path="connection-ttl.html"> + + <a href="connection-ttl.html"> + + + Detecting Dead Connections + + </a> + + + + </li> + + <li class="chapter " data-level="1.22" data-path="slow-consumers.html"> + + <a href="slow-consumers.html"> + + + Detecting Slow Consumers + + </a> + + + + </li> + + <li class="chapter " data-level="1.23" data-path="network-isolation.html"> + + <a href="network-isolation.html"> + + + Avoiding Network Isolation + + </a> + + + + </li> + + <li class="chapter " data-level="1.24" data-path="critical-analysis.html"> + + <a href="critical-analysis.html"> + + + Detecting Broker Issues (Critical Analysis) + + </a> + + + + </li> + + <li class="chapter " data-level="1.25" data-path="transaction-config.html"> + + <a href="transaction-config.html"> + + + Resource Manager Configuration + + </a> + + + + </li> + + <li class="chapter " data-level="1.26" data-path="flow-control.html"> + + <a href="flow-control.html"> + + + Flow Control + + </a> + + + + </li> + + <li class="chapter " data-level="1.27" data-path="send-guarantees.html"> + + <a href="send-guarantees.html"> + + + Guarantees of sends and commits + + </a> + + + + </li> + + <li class="chapter " data-level="1.28" data-path="undelivered-messages.html"> + + <a href="undelivered-messages.html"> + + + Message Redelivery and Undelivered Messages + + </a> + + + + </li> + + <li class="chapter " data-level="1.29" data-path="message-expiry.html"> + + <a href="message-expiry.html"> + + + Message Expiry + + </a> + + + + </li> + + <li class="chapter " data-level="1.30" data-path="large-messages.html"> + + <a href="large-messages.html"> + + + Large Messages + + </a> + + + + </li> + + <li class="chapter " data-level="1.31" data-path="paging.html"> + + <a href="paging.html"> + + + Paging + + </a> + + + + </li> + + <li class="chapter " data-level="1.32" data-path="queue-attributes.html"> + + <a href="queue-attributes.html"> + + + Queue Attributes + + </a> + + + + </li> + + <li class="chapter " data-level="1.33" data-path="scheduled-messages.html"> + + <a href="scheduled-messages.html"> + + + Scheduled Messages + + </a> + + + + </li> + + <li class="chapter " data-level="1.34" data-path="last-value-queues.html"> + + <a href="last-value-queues.html"> + + + Last-Value Queues + + </a> + + + + </li> + + <li class="chapter " data-level="1.35" data-path="message-grouping.html"> + + <a href="message-grouping.html"> + + + Message Grouping + + </a> + + + + </li> + + <li class="chapter " data-level="1.36" data-path="pre-acknowledge.html"> + + <a href="pre-acknowledge.html"> + + + Extra Acknowledge Modes + + </a> + + + + </li> + + <li class="chapter " data-level="1.37" data-path="management.html"> + + <a href="management.html"> + + + Management + + </a> + + + + </li> + + <li class="chapter " data-level="1.38" data-path="management-console.html"> + + <a href="management-console.html"> + + + Management Console + + </a> + + + + </li> + + <li class="chapter " data-level="1.39" data-path="security.html"> + + <a href="security.html"> + + + Security + + </a> + + + + </li> + + <li class="chapter " data-level="1.40" data-path="broker-plugins.html"> + + <a href="broker-plugins.html"> + + + Broker Plugins + + </a> + + + + </li> + + <li class="chapter " data-level="1.41" data-path="resource-limits.html"> + + <a href="resource-limits.html"> + + + Resource Limits + + </a> + + + + </li> + + <li class="chapter " data-level="1.42" data-path="jms-bridge.html"> + + <a href="jms-bridge.html"> + + + The JMS Bridge + + </a> + + + + </li> + + <li class="chapter " data-level="1.43" data-path="client-reconnection.html"> + + <a href="client-reconnection.html"> + + + Client Reconnection and Session Reattachment + + </a> + + + + </li> + + <li class="chapter " data-level="1.44" data-path="diverts.html"> + + <a href="diverts.html"> + + + Diverting and Splitting Message Flows + + </a> + + + + </li> + + <li class="chapter " data-level="1.45" data-path="core-bridges.html"> + + <a href="core-bridges.html"> + + + Core Bridges + + </a> + + + + </li> + + <li class="chapter " data-level="1.46" data-path="duplicate-detection.html"> + + <a href="duplicate-detection.html"> + + + Duplicate Message Detection + + </a> + + + + </li> + + <li class="chapter " data-level="1.47" data-path="clusters.html"> + + <a href="clusters.html"> + + + Clusters + + </a> + + + + </li> + + <li class="chapter " data-level="1.48" data-path="ha.html"> + + <a href="ha.html"> + + + High Availability and Failover + + </a> + + + + </li> + + <li class="chapter " data-level="1.49" data-path="graceful-shutdown.html"> + + <a href="graceful-shutdown.html"> + + + Graceful Server Shutdown + + </a> + + + + </li> + + <li class="chapter active" data-level="1.50" data-path="libaio.html"> + + <a href="libaio.html"> + + + Libaio Native Libraries + + </a> + + + + </li> + + <li class="chapter " data-level="1.51" data-path="thread-pooling.html"> + + <a href="thread-pooling.html"> + + + Thread management + + </a> + + + + </li> + + <li class="chapter " data-level="1.52" data-path="logging.html"> + + <a href="logging.html"> + + + Logging + + </a> + + + + </li> + + <li class="chapter " data-level="1.53" data-path="rest.html"> + + <a href="rest.html"> + + + REST Interface + + </a> + + + + </li> + + <li class="chapter " data-level="1.54" data-path="embedding-activemq.html"> + + <a href="embedding-activemq.html"> + + + Embedding Apache ActiveMQ Artemis + + </a> + + + + </li> + + <li class="chapter " data-level="1.55" data-path="karaf.html"> + + <a href="karaf.html"> + + + Apache Karaf + + </a> + + + + </li> + + <li class="chapter " data-level="1.56" data-path="spring-integration.html"> + + <a href="spring-integration.html"> + + + Spring Integration + + </a> + + + + </li> + + <li class="chapter " data-level="1.57" data-path="cdi-integration.html"> + + <a href="cdi-integration.html"> + + + CDI Integration + + </a> + + + + </li> + + <li class="chapter " data-level="1.58" data-path="intercepting-operations.html"> + + <a href="intercepting-operations.html"> + + + Intercepting Operations + + </a> + + + + </li> + + <li class="chapter " data-level="1.59" data-path="protocols-interoperability.html"> + + <a href="protocols-interoperability.html"> + + + Protocols and Interoperability + + </a> + + + + </li> + + <li class="chapter " data-level="1.60" data-path="tools.html"> + + <a href="tools.html"> + + + Tools + + </a> + + + + </li> + + <li class="chapter " data-level="1.61" data-path="maven-plugin.html"> + + <a href="maven-plugin.html"> + + + Maven Plugin + + </a> + + + + </li> + + <li class="chapter " data-level="1.62" data-path="unit-testing.html"> + + <a href="unit-testing.html"> + + + Unit Testing + + </a> + + + + </li> + + <li class="chapter " data-level="1.63" data-path="perf-tuning.html"> + + <a href="perf-tuning.html"> + + + Troubleshooting and Performance Tuning + + </a> + + + + </li> + + <li class="chapter " data-level="1.64" data-path="configuration-index.html"> + + <a href="configuration-index.html"> + + + Configuration Reference + + </a> + + + + </li> + + <li class="chapter " data-level="1.65" data-path="updating-artemis.html"> + + <a href="updating-artemis.html"> + + + Updating Artemis + + </a> + + + + </li> + + + + + <li class="divider"></li> + + <li> + <a href="https://www.gitbook.com"; target="blank" class="gitbook-link"> + Published with GitBook + </a> + </li> +</ul> + + + </nav> + + + </div> + + <div class="book-body"> + + <div class="body-inner"> + + + +<div class="book-header" role="navigation"> + + + <!-- Title --> + <h1> + <i class="fa fa-circle-o-notch fa-spin"></i> + <a href="." >Libaio Native Libraries</a> + </h1> +</div> + + + + + <div class="page-wrapper" tabindex="-1" role="main"> + <div class="page-inner"> + +<div id="book-search-results"> + <div class="search-noresults"> + + <section class="normal markdown-section"> + + <h1 id="libaio-native-libraries">Libaio Native Libraries</h1> +<p>Apache ActiveMQ Artemis distributes a native library, used as a bridge for its fast journal, between Apache ActiveMQ Artemis +and Linux libaio.</p> +<p><code>libaio</code> is a library, developed as part of the Linux kernel project. +With <code>libaio</code> we submit writes to the operating system where they are +processed asynchronously. Some time later the OS will call our code back +when they have been processed.</p> +<p>We use this in our high performance journal if configured to do so, +please see <a href="persistence.html">Persistence</a>.</p> +<p>This is the native libraries distributed by Apache ActiveMQ Artemis:</p> +<ul> +<li>libActiveMQAIO64.so - x86 64 bits</li> +<li>We used to distributed libActiveMQAIO32.so until early 2017. While it's not available on the distribution it should still be possible to compile to a 32 bits environment if needed.</li> +</ul> +<p>When using libaio, Apache ActiveMQ Artemis will always try loading these files as long +as they are on the <a href="using-server.html#library-path">library path</a></p> +<h2 id="runtime-dependencies">Runtime dependencies</h2> +<p>If you just want to use the provided native binaries you need to install the required libaio dependency.</p> +<p>You can install libaio using the following steps as the root user:</p> +<p>Using yum, (e.g. on Fedora or Red Hat Enterprise Linux):</p> +<pre><code>yum install libaio +</code></pre><p>Using aptitude, (e.g. on Ubuntu or Debian system):</p> +<pre><code>apt-get install libaio +</code></pre><h2 id="compiling-the-native-libraries">Compiling the native libraries</h2> +<p>In the case that you are using Linux on a platform other than x86_32 or +x86_64 (for example Itanium 64 bits or IBM Power) you may need to +compile the native library, since we do not distribute binaries for +those platforms with the release.</p> +<h2 id="compilation-dependencies">Compilation dependencies</h2> +<blockquote> +<p><strong>Note</strong></p> +<p>The native layer is only available on Linux. If you are +in a platform other than Linux the native compilation will not work</p> +</blockquote> +<p>These are the required linux packages to be installed for the compilation to work:</p> +<ul> +<li><p>gcc - C Compiler</p> +</li> +<li><p>gcc-c++ or g++ - Extension to gcc with support for C++</p> +</li> +<li><p>libtool - Tool for link editing native libraries</p> +</li> +<li><p>libaio - library to disk asynchronous IO kernel functions</p> +</li> +<li><p>libaio-dev - Compilation support for libaio</p> +</li> +<li><p>cmake</p> +</li> +<li><p>A full JDK installed with the environment variable JAVA_HOME set to +its location</p> +</li> +</ul> +<p>To perform this installation on RHEL or Fedora, you can simply type this at a command line:</p> +<pre><code>sudo yum install libtool gcc-c++ gcc libaio libaio-devel cmake +</code></pre><p>Or on Debian systems:</p> +<pre><code>sudo apt-get install libtool gcc-g++ gcc libaio libaio- cmake +</code></pre><blockquote> +<p><strong>Note</strong></p> +<p>You could find a slight variation of the package names depending on +the version and Linux distribution. (for example gcc-c++ on Fedora +versus g++ on Debian systems)</p> +</blockquote> +<h2 id="invoking-the-compilation">Invoking the compilation</h2> +<p>In the source distribution or git clone, in the <code>artemis-native</code> directory, execute the shell +script <code>compile-native.sh</code>. This script will invoke the proper commands to perform the native build.</p> +<p>If you want more information refer to the <a href="http://cmake.org"; target="_blank">cmake web pages</a>.</p> + + + </section> + + </div> + <div class="search-results"> + <div class="has-results"> + + <h1 class="search-results-title"><span class='search-results-count'></span> results matching "<span class='search-query'></span>"</h1> + <ul class="search-results-list"></ul> + + </div> + <div class="no-results"> + + <h1 class="search-results-title">No results matching "<span class='search-query'></span>"</h1> + + </div> + </div> +</div> + + </div> + </div> + + </div> + + + + <a href="graceful-shutdown.html" class="navigation navigation-prev " aria-label="Previous page: Graceful Server Shutdown"> + <i class="fa fa-angle-left"></i> + </a> + + + <a href="thread-pooling.html" class="navigation navigation-next " aria-label="Next page: Thread management"> + <i class="fa fa-angle-right"></i> + </a> + + + + </div> + + <script> + var gitbook = gitbook || []; + gitbook.push(function() { + gitbook.page.hasChanged({"page":{"title":"Libaio Native Libraries","level":"1.50","depth":1,"next":{"title":"Thread management","level":"1.51","depth":1,"path":"thread-pooling.md","ref":"thread-pooling.md","articles":[]},"previous":{"title":"Graceful Server Shutdown","level":"1.49","depth":1,"path":"graceful-shutdown.md","ref":"graceful-shutdown.md","articles":[]},"dir":"ltr"},"config":{"plugins":[],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"highlight":{},"search":{},"lunr":{"maxIndexSize":1000000},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"fontsettings":{"theme":"white","family":"sans","size":2},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styl es/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"github":"apache/activemq-artemis","theme":"default","githubHost":"https://github.com/","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"ActiveMQ Artemis Documentation","links":{"home":"http://activemq.apache.org/artemis","issues":"https://issues.apache.org/jira/browse/ARTEMIS","contribute":"http://activemq.apache.org/contributing.html"},"gitbook":"3.x.x","description":"ActiveMQ Artemis User Guide and Reference Documentation"},"file":{"path":"libaio.md","mtime":"2017-09-08T01:26:53.000Z","type":"markdown"},"gitbook":{"version":"3.1.1","time":"2017-09-14T19:42:32.953Z"},"basePath":".","book":{"language":""}}); + }); + </script> +</div> + + + <script src="gitbook/gitbook.js"></script> + <script src="gitbook/theme.js"></script> + + + <script src="gitbook/gitbook-plugin-search/search-engine.js"></script> + + + + <script src="gitbook/gitbook-plugin-search/search.js"></script> + + + + <script src="gitbook/gitbook-plugin-lunr/lunr.min.js"></script> + + + + <script src="gitbook/gitbook-plugin-lunr/search-lunr.js"></script> + + + + <script src="gitbook/gitbook-plugin-sharing/buttons.js"></script> + + + + <script src="gitbook/gitbook-plugin-fontsettings/fontsettings.js"></script> + + + + </body> +</html> +
