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https://issues.apache.org/jira/browse/ACTIVEMQ6-3 We are renaming packages from activemq6 to activemq as that's more generic and version independent The previous commit renamed the directories. On this commit now I'm changing the code. If we changed the code and the directories on the same commit git would remove and add a lot of files without recognizing the renames.
272 lines
12 KiB
XML
272 lines
12 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!-- <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.3CR3//EN"
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"../../../lib/docbook-support/support/docbook-dtd/docbookx.dtd"> -->
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<!-- ============================================================================= -->
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<!-- Copyright © 2009 Red Hat, Inc. and others. -->
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<!-- -->
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<!-- The text of and illustrations in this document are licensed by Red Hat under -->
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<!-- a Creative Commons Attribution–Share Alike 3.0 Unported license ("CC-BY-SA"). -->
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<!-- -->
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<!-- An explanation of CC-BY-SA is available at -->
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<!-- -->
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<!-- http://creativecommons.org/licenses/by-sa/3.0/. -->
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<!-- -->
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<!-- In accordance with CC-BY-SA, if you distribute this document or an adaptation -->
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<!-- of it, you must provide the URL for the original version. -->
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<!-- -->
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<!-- Red Hat, as the licensor of this document, waives the right to enforce, -->
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<!-- and agrees not to assert, Section 4d of CC-BY-SA to the fullest extent -->
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<!-- permitted by applicable law. -->
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<!-- ============================================================================= -->
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<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % BOOK_ENTITIES SYSTEM "HornetQ_User_Manual.ent">
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%BOOK_ENTITIES;
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]>
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<chapter id="embedding-hornetq">
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<title>Embedding HornetQ</title>
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<para>HornetQ is designed as set of simple Plain Old Java Objects (POJOs).
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This means HornetQ can be instantiated and run in any dependency injection
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framework such as JBoss Microcontainer, Spring or Google Guice. It also
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means that if you have an application that could use messaging functionality
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internally, then it can <emphasis>directly instantiate</emphasis> HornetQ
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clients and servers in its own application code to perform that
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functionality. We call this <emphasis>embedding</emphasis> HornetQ.</para>
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<para>Examples of applications that might want to do this include any
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application that needs very high performance, transactional, persistent
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messaging but doesn't want the hassle of writing it all from scratch.</para>
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<para>Embedding HornetQ can be done in very few easy steps. Instantiate the
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configuration object, instantiate the server, start it, and you have a
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HornetQ running in your virtual machine. It's as simple and easy as
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that.</para>
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<section>
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<title>Simple Config File Embedding</title>
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<para>The simplest way to embed HornetQ is to use the embedded wrapper
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classes and configure HornetQ through its configuration files. There are
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two different helper classes for this depending on whether your using the
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HornetQ Core API or JMS.</para>
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<section>
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<title>Core API Only</title>
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<para>For instantiating a core HornetQ Server only, the steps are pretty
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simple. The example requires that you have defined a configuration file
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<literal>hornetq-configuration.xml</literal> in your
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classpath:</para>
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<programlisting>
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import org.apache.activemq.core.server.embedded.EmbeddedHornetQ;
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...
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EmbeddedHornetQ embedded = new EmbeddedHornetQ();
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embedded.start();
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ClientSessionFactory nettyFactory = HornetQClient.createClientSessionFactory(
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new TransportConfiguration(
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InVMConnectorFactory.class.getName()));
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ClientSession session = factory.createSession();
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session.createQueue("example", "example", true);
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ClientProducer producer = session.createProducer("example");
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ClientMessage message = session.createMessage(true);
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message.getBody().writeString("Hello");
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producer.send(message);
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session.start();
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ClientConsumer consumer = session.createConsumer("example");
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ClientMessage msgReceived = consumer.receive();
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System.out.println("message = " + msgReceived.getBody().readString());
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session.close();</programlisting>
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<para>The <literal>EmbeddedHornetQ</literal> class has a
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few additional setter methods that allow you to specify a different
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config file name as well as other properties. See the javadocs for this
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class for more details.</para>
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</section>
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<section id="simple.embedded.jms">
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<title>JMS API</title>
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<para>JMS embedding is simple as well. This example requires that you
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have defined the config files
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<literal>hornetq-configuration.xml</literal>,
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<literal>hornetq-jms.xml</literal>, and a
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<literal>hornetq-users.xml</literal> if you have security enabled. Let's
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also assume that a queue and connection factory has been defined in the
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<literal>hornetq-jms.xml</literal> config file.</para>
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<programlisting>
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import org.apache.activemq.jms.server.embedded.EmbeddedJMS;
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...
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EmbeddedJMS jms = new EmbeddedJMS();
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jms.start();
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// This assumes we have configured hornetq-jms.xml with the appropriate config information
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ConnectionFactory connectionFactory = jms.lookup("ConnectionFactory");
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Destination destination = jms.lookup("/example/queue");
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... regular JMS code ...</programlisting>
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<para>By default, the <literal>EmbeddedJMS</literal>
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class will store component entries defined within your
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<literal>hornetq-jms.xml</literal> file in an internal concurrent hash
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map. The <literal>EmbeddedJMS.lookup()</literal> method returns
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components stored in this map. If you want to use JNDI, call the
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<literal>EmbeddedJMS.setContext()</literal> method with the root JNDI
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context you want your components bound into. See the javadocs for this
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class for more details on other config options.</para>
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</section>
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</section>
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<section>
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<title>POJO instantiation - Embedding Programmatically</title>
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<para>You can follow this step-by-step guide to programmatically embed the
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core, non-JMS HornetQ Server instance:</para>
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<para>Create the configuration object - this contains configuration
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information for a HornetQ instance. The setter methods of this class allow
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you to programmatically set configuration options as describe in the <xref
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linkend="server.configuration" /> section.</para>
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<para>The acceptors are configured through
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<literal>ConfigurationImpl</literal>. Just add the
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<literal>NettyAcceptorFactory</literal> on the transports the same way you
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would through the main configuration file.</para>
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<programlisting>
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import org.apache.activemq.core.config.Configuration;
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import org.apache.activemq.core.config.impl.ConfigurationImpl;
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...
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Configuration config = new ConfigurationImpl();
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HashSet<TransportConfiguration> transports = new HashSet<TransportConfiguration>();
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transports.add(new TransportConfiguration(NettyAcceptorFactory.class.getName()));
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transports.add(new TransportConfiguration(InVMAcceptorFactory.class.getName()));
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config.setAcceptorConfigurations(transports);</programlisting>
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<para>You need to instantiate an instance of
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<literal>org.apache.activemq.api.core.server.embedded.EmbeddedHornetQ</literal>
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and add the configuration object to it.</para>
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<programlisting>
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import org.apache.activemq.api.core.server.HornetQ;
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import org.apache.activemq.core.server.embedded.EmbeddedHornetQ;
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...
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EmbeddedHornetQ server = new EmbeddedHornetQ();
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server.setConfiguration(config);
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server.start();</programlisting>
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<para>You also have the option of instantiating
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<literal>HornetQServerImpl</literal> directly:</para>
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<programlisting>
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HornetQServer server = new HornetQServerImpl(config);
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server.start();</programlisting>
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<para>For JMS POJO instantiation, you work with the EmbeddedJMS class
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instead as described earlier. First you define the configuration
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programmatically for your ConnectionFactory and Destination objects, then
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set the JmsConfiguration property of the EmbeddedJMS class. Here is an
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example of this:</para>
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<programlisting>
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// Step 1. Create HornetQ core configuration, and set the properties accordingly
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Configuration configuration = new ConfigurationImpl();
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configuration.setPersistenceEnabled(false);
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configuration.setSecurityEnabled(false);
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configuration.getAcceptorConfigurations().add(new TransportConfiguration(NettyAcceptorFactory.class.getName()));
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// Step 2. Create the JMS configuration
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JMSConfiguration jmsConfig = new JMSConfigurationImpl();
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// Step 3. Configure the JMS ConnectionFactory
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TransportConfiguration connectorConfig = new TransportConfiguration(NettyConnectorFactory.class.getName());
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ConnectionFactoryConfiguration cfConfig = new ConnectionFactoryConfigurationImpl("cf", connectorConfig, "/cf");
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jmsConfig.getConnectionFactoryConfigurations().add(cfConfig);
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// Step 4. Configure the JMS Queue
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JMSQueueConfiguration queueConfig = new JMSQueueConfigurationImpl("queue1", null, false, "/queue/queue1");
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jmsConfig.getQueueConfigurations().add(queueConfig);
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// Step 5. Start the JMS Server using the HornetQ core server and the JMS configuration
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EmbeddedJMS jmsServer = new EmbeddedJMS();
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jmsServer.setConfiguration(configuration);
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jmsServer.setJmsConfiguration(jmsConfig);
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jmsServer.start();</programlisting>
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<para>Please see <xref linkend="examples.embedded.jms" /> for an example which
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shows how to setup and run HornetQ embedded with JMS.</para>
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</section>
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<section>
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<title>Dependency Frameworks</title>
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<para>You may also choose to use a dependency injection framework such as
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<trademark>JBoss Micro Container</trademark> or <trademark>Spring
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Framework</trademark>. See <xref linkend="spring.integration" /> for more
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details on Spring and HornetQ, but here's how you would do things with the
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JBoss Micro Container.</para>
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<para>HornetQ standalone uses JBoss Micro Container as the injection
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framework. <literal>HornetQBootstrapServer</literal> and
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<literal>hornetq-beans.xml</literal> which are part of the HornetQ
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distribution provide a very complete implementation of what's needed to
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bootstrap the server using JBoss Micro Container.</para>
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<para>When using JBoss Micro Container, you need to provide an XML file
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declaring the <literal>HornetQServer</literal> and
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<literal>Configuration</literal> object, you can also inject a security
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manager and a MBean server if you want, but those are optional.</para>
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<para>A very basic XML Bean declaration for the JBoss Micro Container
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would be:</para>
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<programlisting>
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<?xml version="1.0" encoding="UTF-8"?>
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<deployment xmlns="urn:jboss:bean-deployer:2.0">
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<!-- The core configuration -->
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<bean name="Configuration"
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class="org.apache.activemq.core.config.impl.FileConfiguration">
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</bean>
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<!-- The core server -->
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<bean name="HornetQServer"
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class="org.apache.activemq.core.server.impl.HornetQServerImpl">
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<constructor>
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<parameter>
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<inject bean="Configuration"/>
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</parameter>
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</constructor>
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</bean>
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</deployment></programlisting>
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<para><literal>HornetQBootstrapServer</literal> provides an easy
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encapsulation of JBoss Micro Container.</para>
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<programlisting>
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HornetQBootstrapServer bootStrap = new HornetQBootstrapServer(new String[] {"hornetq-beans.xml"});
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bootStrap.run();</programlisting>
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</section>
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</chapter>
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