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<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="cdi-integration">CDI Integration</h1> +<p>Apache ActiveMQ Artemis provides a simple CDI integration. It can either use an embedded broker or connect to a remote broker.</p> +<h2 id="configuring-a-connection">Configuring a connection</h2> +<p>Configuration is provided by implementing the <code>ArtemisClientConfiguration</code> interface.</p> +<pre><code class="lang-java"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">interface</span> <span class="hljs-title">ArtemisClientConfiguration</span> </span>{ + <span class="hljs-function">String <span class="hljs-title">getHost</span><span class="hljs-params">()</span></span>; + + <span class="hljs-function">Integer <span class="hljs-title">getPort</span><span class="hljs-params">()</span></span>; + + <span class="hljs-function">String <span class="hljs-title">getUsername</span><span class="hljs-params">()</span></span>; + + <span class="hljs-function">String <span class="hljs-title">getPassword</span><span class="hljs-params">()</span></span>; + + <span class="hljs-function">String <span class="hljs-title">getUrl</span><span class="hljs-params">()</span></span>; + + <span class="hljs-function">String <span class="hljs-title">getConnectorFactory</span><span class="hljs-params">()</span></span>; + + <span class="hljs-function"><span class="hljs-keyword">boolean</span> <span class="hljs-title">startEmbeddedBroker</span><span class="hljs-params">()</span></span>; + + <span class="hljs-function"><span class="hljs-keyword">boolean</span> <span class="hljs-title">isHa</span><span class="hljs-params">()</span></span>; + + <span class="hljs-function"><span class="hljs-keyword">boolean</span> <span class="hljs-title">hasAuthentication</span><span class="hljs-params">()</span></span>; +} +</code></pre> +<p>There's a default configuration out of the box, if none is specified. This will generate an embedded broker.</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="vertx-integration.html" class="navigation navigation-prev " aria-label="Previous page: VertX Integration"> + <i class="fa fa-angle-left"></i> + </a> + + + <a href="intercepting-operations.html" class="navigation navigation-next " aria-label="Next page: Intercepting Operations"> + <i class="fa fa-angle-right"></i> + </a> + + + + </div> + + <script> + var gitbook = gitbook || []; + gitbook.push(function() { + gitbook.page.hasChanged({"page":{"title":"CDI Integration","level":"1.53","depth":1,"next":{"title":"Intercepting Operations","level":"1.54","depth":1,"path":"intercepting-operations.md","ref":"intercepting-operations.md","articles":[]},"previous":{"title":"VertX Integration","level":"1.52","depth":1,"path":"vertx-integration.md","ref":"vertx-integration.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","mo bi":"styles/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/","issues":"http://activemq.apache.org/","contribute":"http://activemq.apache.org/contributing.html"},"gitbook":"3.x.x","description":"ActiveMQ Artemis User Guide and Reference Documentation"},"file":{"path":"cdi-integration.md","mtime":"2016-10-22T12:23:36.000Z","type":"markdown"},"gitbook":{"version":"3.1.1","time":"2016-11-12T01:00:04.718Z"},"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> +
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+ + <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="the-client-classpath">The Client Classpath</h1> +<p>Apache ActiveMQ Artemis requires several jars on the <em>Client Classpath</em> depending on +whether the client uses Apache ActiveMQ Artemis Core API, JMS, and JNDI.</p> +<blockquote> +<p><strong>Warning</strong></p> +<p>All the jars mentioned here can be found in the <code>lib</code> directory of the +Apache ActiveMQ Artemis distribution. Be sure you only use the jars from the correct +version of the release, you <em>must not</em> mix and match versions of jars +from different Apache ActiveMQ Artemis versions. Mixing and matching different jar +versions may cause subtle errors and failures to occur.</p> +</blockquote> +<h2 id="apache-activemq-artemis-core-client">Apache ActiveMQ Artemis Core Client</h2> +<p>If you are using just a pure Apache ActiveMQ Artemis Core client (i.e. no JMS) then you +need <code>activemq-core-client.jar</code>, <code>activemq-commons.jar</code>, and <code>netty.jar</code> +on your client classpath.</p> +<h2 id="jms-client">JMS Client</h2> +<p>If you are using JMS on the client side, then you will also need to +include <code>activemq-jms-client.jar</code> and <code>geronimo-jms_2.0_spec.jar</code>.</p> +<blockquote> +<p><strong>Note</strong></p> +<p><code>geronimo-jms_2.0_spec.jar</code> just contains Java EE API interface classes needed +for the <code>javax.jms.*</code> classes. If you already have a jar with these +interface classes on your classpath, you will not need it.</p> +</blockquote> + + + </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="jms-core-mapping.html" class="navigation navigation-prev " aria-label="Previous page: Mapping JMS Concepts to the Core API"> + <i class="fa fa-angle-left"></i> + </a> + + + <a href="examples.html" class="navigation navigation-next " aria-label="Next page: Examples"> + <i class="fa fa-angle-right"></i> + </a> + + + + </div> + + <script> + var gitbook = gitbook || []; + gitbook.push(function() { + 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data-path="configuration-index.html"> + + <a href="configuration-index.html"> + + + Configuration Reference + + </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="." >Client Reconnection and Session Reattachment</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="client-reconnection-and-session-reattachment">Client Reconnection and Session Reattachment</h1> +<p>Apache ActiveMQ Artemis clients can be configured to automatically reconnect or +re-attach to the server in the event that a failure is detected in the +connection between the client and the server.</p> +<h2 id="100-transparent-session-re-attachment">100% Transparent session re-attachment</h2> +<p>If the failure was due to some transient failure such as a temporary +network failure, and the target server was not restarted, then the +sessions will still be existent on the server, assuming the client +hasn't been disconnected for more than connection-ttl <a href="connection-ttl.html">Detecting Dead Connections</a></p> +<p>In this scenario, Apache ActiveMQ Artemis will automatically re-attach the client +sessions to the server sessions when the connection reconnects. This is +done 100% transparently and the client can continue exactly as if +nothing had happened.</p> +<p>The way this works is as follows:</p> +<p>As Apache ActiveMQ Artemis clients send commands to their servers they store each sent +command in an in-memory buffer. In the case that connection failure +occurs and the client subsequently reattaches to the same server, as +part of the reattachment protocol the server informs the client during +reattachment with the id of the last command it successfully received +from that client.</p> +<p>If the client has sent more commands than were received before failover +it can replay any sent commands from its buffer so that the client and +server can reconcile their states.</p> +<p>The size of this buffer is configured by the <code>ConfirmationWindowSize</code> +parameter, when the server has received <code>ConfirmationWindowSize</code> bytes +of commands and processed them it will send back a command confirmation +to the client, and the client can then free up space in the buffer.</p> +<p>If you are using JMS and you're using the JMS service on the server to +load your JMS connection factory instances into JNDI then this parameter +can be configured in the jms configuration using the element +<code>confirmationWindowSize</code> a. If you're using JMS but not using JNDI +then you can set these values directly on the +<code>ActiveMQConnectionFactory</code> instance using the appropriate setter +method.</p> +<p>If you're using the core API you can set these values directly on the +<code>ServerLocator</code> instance using the appropriate setter method.</p> +<p>The window is specified in bytes.</p> +<p>Setting this parameter to <code>-1</code> disables any buffering and prevents any +re-attachment from occurring, forcing reconnect instead. The default +value for this parameter is <code>-1</code>. (Which means by default no auto +re-attachment will occur)</p> +<h2 id="session-reconnection">Session reconnection</h2> +<p>Alternatively, the server might have actually been restarted after +crashing or being stopped. In this case any sessions will no longer be +existent on the server and it won't be possible to 100% transparently +re-attach to them.</p> +<p>In this case, Apache ActiveMQ Artemis will automatically reconnect the connection and +<em>recreate</em> any sessions and consumers on the server corresponding to the +sessions and consumers on the client. This process is exactly the same +as what happens during failover onto a backup server.</p> +<p>Client reconnection is also used internally by components such as core +bridges to allow them to reconnect to their target servers.</p> +<p>Please see the section on failover <a href="ha.html">Automatic Client Failover</a> to get a full understanding of how +transacted and non-transacted sessions are reconnected during +failover/reconnect and what you need to do to maintain <em>once and only +once</em>delivery guarantees.</p> +<h2 id="configuring-reconnectionreattachment-attributes">Configuring reconnection/reattachment attributes</h2> +<p>Client reconnection is configured using the following parameters:</p> +<ul> +<li><p><code>retryInterval</code>. This optional parameter determines the period in +milliseconds between subsequent reconnection attempts, if the +connection to the target server has failed. The default value is +<code>2000</code> milliseconds.</p> +</li> +<li><p><code>retryIntervalMultiplier</code>. This optional parameter determines +determines a multiplier to apply to the time since the last retry to +compute the time to the next retry.</p> +<p>This allows you to implement an <em>exponential backoff</em> between retry +attempts.</p> +<p>Let's take an example:</p> +<p>If we set <code>retryInterval</code> to <code>1000</code> ms and we set +<code>retryIntervalMultiplier</code> to <code>2.0</code>, then, if the first reconnect +attempt fails, we will wait <code>1000</code> ms then <code>2000</code> ms then <code>4000</code> ms +between subsequent reconnection attempts.</p> +<p>The default value is <code>1.0</code> meaning each reconnect attempt is spaced +at equal intervals.</p> +</li> +<li><p><code>maxRetryInterval</code>. This optional parameter determines the maximum +retry interval that will be used. When setting +<code>retryIntervalMultiplier</code> it would otherwise be possible that +subsequent retries exponentially increase to ridiculously large +values. By setting this parameter you can set an upper limit on that +value. The default value is <code>2000</code> milliseconds.</p> +</li> +<li><p><code>reconnectAttempts</code>. This optional parameter determines the total +number of reconnect attempts to make before giving up and shutting +down. A value of <code>-1</code> signifies an unlimited number of attempts. The +default value is <code>0</code>.</p> +</li> +</ul> +<p>If you're using JMS and you're using JNDI on the client to look up your +JMS connection factory instances then you can specify these parameters +in the JNDI context environment in, e.g. <code>jndi.properties</code>:</p> +<pre><code>java.naming.factory.initial = ActiveMQInitialContextFactory +connection.ConnectionFactory=tcp://localhost:61616?retryInterval=1000&retryIntervalMultiplier=1.5&maxRetryInterval=60000&reconnectAttempts=1000 +</code></pre><p>If you're using JMS, but instantiating your JMS connection factory +directly, you can specify the parameters using the appropriate setter +methods on the <code>ActiveMQConnectionFactory</code> immediately after creating +it.</p> +<p>If you're using the core API and instantiating the <code>ServerLocator</code> +instance directly you can also specify the parameters using the +appropriate setter methods on the <code>ServerLocator</code> immediately after +creating it.</p> +<p>If your client does manage to reconnect but the session is no longer +available on the server, for instance if the server has been restarted +or it has timed out, then the client won't be able to re-attach, and any +<code>ExceptionListener</code> or <code>FailureListener</code> instances registered on the +connection or session will be called.</p> +<h1 id="exceptionlisteners-and-sessionfailurelisteners">ExceptionListeners and SessionFailureListeners</h1> +<p>Please note, that when a client reconnects or re-attaches, any +registered JMS <code>ExceptionListener</code> or core API <code>SessionFailureListener</code> +will be called.</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="jms-bridge.html" class="navigation navigation-prev " aria-label="Previous page: The JMS Bridge"> + <i class="fa fa-angle-left"></i> + </a> + + + <a href="diverts.html" class="navigation navigation-next " aria-label="Next page: Diverting and Splitting Message Flows"> + <i class="fa fa-angle-right"></i> + </a> + + + + </div> + + <script> + var gitbook = gitbook || []; 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