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| <h1 id="architecture">Architecture</h1> |
| <p>In this section we will give an overview of the Apache ActiveMQ Artemis high level |
| architecture.</p> |
| <h2 id="core-architecture">Core Architecture</h2> |
| <p>Apache ActiveMQ Artemis core is designed simply as set of Plain Old Java Objects |
| (POJOs) - we hope you like its clean-cut design.</p> |
| <p>We've also designed it to have as few dependencies on external jars as |
| possible. In fact, Apache ActiveMQ Artemis core has only one jar dependency, netty.jar, |
| other than the standard JDK classes! This is because we use some of the |
| netty buffer classes internally.</p> |
| <p>This allows Apache ActiveMQ Artemis to be easily embedded in your own project, or |
| instantiated in any dependency injection framework such as Spring or |
| Google Guice.</p> |
| <p>Each Apache ActiveMQ Artemis server has its own ultra high performance persistent |
| journal, which it uses for message and other persistence.</p> |
| <p>Using a high performance journal allows outrageous persistence message |
| performance, something not achievable when using a relational database |
| for persistence.</p> |
| <p>Apache ActiveMQ Artemis clients, potentially on different physical machines interact |
| with the Apache ActiveMQ Artemis server. Apache ActiveMQ Artemis currently provides two APIs for |
| messaging at the client side:</p> |
| <ol> |
| <li><p>Core client API. This is a simple intuitive Java API that allows the |
| full set of messaging functionality without some of the complexities |
| of JMS.</p> |
| </li> |
| <li><p>JMS client API. The standard JMS API is available at the client |
| side.</p> |
| </li> |
| </ol> |
| <p>Apache ActiveMQ Artemis also provides different protocol implementations on the server so you can use respective clients for these protocols:</p> |
| <ol> |
| <li>Stomp</li> |
| <li>OpenWire</li> |
| <li>AMQP</li> |
| </ol> |
| <p>JMS semantics are implemented by a JMS facade layer on the client |
| side.</p> |
| <p>The Apache ActiveMQ Artemis server does not speak JMS and in fact does not know |
| anything about JMS, it is a protocol agnostic messaging server designed |
| to be used with multiple different protocols.</p> |
| <p>When a user uses the JMS API on the client side, all JMS interactions |
| are translated into operations on the Apache ActiveMQ Artemis core client API before |
| being transferred over the wire using the Apache ActiveMQ Artemis wire format.</p> |
| <p>The server always just deals with core API interactions.</p> |
| <p>A schematic illustrating this relationship is shown in figure 3.1 below:</p> |
| <p><img src="images/architecture1.jpg" alt="ActiveMQ Artemis architecture1"></p> |
| <p>Figure 3.1 shows two user applications interacting with an Apache ActiveMQ Artemis |
| server. User Application 1 is using the JMS API, while User Application |
| 2 is using the core client API directly.</p> |
| <p>You can see from the diagram that the JMS API is implemented by a thin |
| facade layer on the client side.</p> |
| <h2 id="apache-activemq-artemis-embedded-in-your-own-application">Apache ActiveMQ Artemis embedded in your own application</h2> |
| <p>Apache ActiveMQ Artemis core is designed as a set of simple POJOs so if you have an |
| application that requires messaging functionality internally but you |
| don't want to expose that as an Apache ActiveMQ Artemis server you can directly |
| instantiate and embed Apache ActiveMQ Artemis servers in your own application.</p> |
| <p>For more information on embedding Apache ActiveMQ Artemis, see <a href="embedding-activemq.html">Embedding Apache ActiveMQ Artemis</a>.</p> |
| <h2 id="apache-activemq-artemis-integrated-with-a-java-ee-application-server">Apache ActiveMQ Artemis integrated with a Java EE application server</h2> |
| <p>Apache ActiveMQ Artemis provides its own fully functional Java Connector Architecture |
| (JCA) adaptor which enables it to be integrated easily into any Java EE |
| compliant application server or servlet engine.</p> |
| <p>Java EE application servers provide Message Driven Beans (MDBs), which are a |
| special type of Enterprise Java Beans (EJBs) that can process messages |
| from sources such as JMS systems or mail systems.</p> |
| <p>Probably the most common use of an MDB is to consume messages from a JMS |
| messaging system.</p> |
| <p>According to the Java EE specification, a Java EE application server uses a JCA |
| adapter to integrate with a JMS messaging system so it can consume |
| messages for MDBs.</p> |
| <p>However, the JCA adapter is not only used by the Java EE application server |
| for <em>consuming</em> messages via MDBs, it is also used when sending message |
| to the JMS messaging system e.g. from inside an EJB or servlet.</p> |
| <p>When integrating with a JMS messaging system from inside a Java EE |
| application server it is always recommended that this is done via a JCA |
| adaptor. In fact, communicating with a JMS messaging system directly, |
| without using JCA would be illegal according to the Java EE specification.</p> |
| <p>The application server's JCA service provides extra functionality such |
| as connection pooling and automatic transaction enlistment, which are |
| desirable when using messaging, say, from inside an EJB. It is possible |
| to talk to a JMS messaging system directly from an EJB, MDB or servlet |
| without going through a JCA adapter, but this is not recommended since |
| you will not be able to take advantage of the JCA features, such as |
| caching of JMS sessions, which can result in poor performance.</p> |
| <p>Figure 3.2 below shows a Java EE application server integrating with a |
| Apache ActiveMQ Artemis server via the Apache ActiveMQ Artemis JCA adaptor. Note that all |
| communication between EJB sessions or entity beans and Message Driven |
| beans go through the adaptor and not directly to Apache ActiveMQ Artemis.</p> |
| <p>The large arrow with the prohibited sign shows an EJB session bean |
| talking directly to the Apache ActiveMQ Artemis server. This is not recommended as |
| you'll most likely end up creating a new connection and session every |
| time you want to interact from the EJB, which is an anti-pattern.</p> |
| <p><img src="images/architecture2.jpg" alt="ActiveMQ Artemis architecture2"></p> |
| <p>For more information on using the JCA adaptor, please see <a href="appserver-integration.md">Application Server Integration and Java EE</a>.</p> |
| <h2 id="apache-activemq-artemis-stand-alone-server">Apache ActiveMQ Artemis stand-alone server</h2> |
| <p>Apache ActiveMQ Artemis can also be deployed as a stand-alone server. This means a |
| fully independent messaging server not dependent on a Java EE application |
| server.</p> |
| <p>The standard stand-alone messaging server configuration comprises a core |
| messaging server and a JMS service.</p> |
| <p>The role of the JMS Service is to deploy any JMS Queue, Topic and |
| ConnectionFactory instances from any server side JMS |
| configuration. It also provides a simple management API for |
| creating and destroying Queues and Topics |
| which can be accessed via JMX or the connection. It is a separate |
| service to the ActiveMQ Artemis core server, since the core server is JMS |
| agnostic. If you don't want to deploy any JMS Queue or Topic via |
| server side XML configuration and don't require a JMS management |
| API on the server side then you can disable this service.</p> |
| <p>The stand-alone server configuration uses <a href="https://github.com/airlift/airline" target="_blank">Airline</a> |
| for bootstrapping the Broker.</p> |
| <p>The stand-alone server architecture is shown in figure 3.3 below:</p> |
| <p><img src="images/architecture3.jpg" alt="ActiveMQ Artemis architecture3"></p> |
| <p>For more information on server configuration files see <a href="configuration-index.html">Server Configuration</a></p> |
| |
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