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| Configuring Transports |
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| Detecting Dead Connections |
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| Detecting Broker Issues (Critical Analysis) |
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| Resource Manager Configuration |
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| Flow Control |
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| Guarantees of sends and commits |
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| Message Redelivery and Undelivered Messages |
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| Message Expiry |
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| Large Messages |
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| Paging |
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| Scheduled Messages |
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| Last-Value Queues |
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| Ring Queues |
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| Retroactive Addresses |
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| Exclusive Queues |
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| Message Grouping |
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| Consumer Priority |
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| Extra Acknowledge Modes |
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| Management |
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| Management Console |
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| Metrics |
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| Security |
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| Masking Passwords |
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| Broker Plugins |
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| Resource Limits |
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| <a href="jms-bridge.html"> |
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| The JMS Bridge |
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| Client Reconnection and Session Reattachment |
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| Diverting and Splitting Message Flows |
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| Core Bridges |
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| Transformers |
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| <li class="chapter " data-level="1.58" data-path="duplicate-detection.html"> |
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| <a href="duplicate-detection.html"> |
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| Duplicate Message Detection |
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| </a> |
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| <li class="chapter " data-level="1.59" data-path="clusters.html"> |
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| <a href="clusters.html"> |
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| Clusters |
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| <li class="chapter " data-level="1.60" data-path="federation.html"> |
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| <a href="federation.html"> |
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| Federation |
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| <a href="federation-address.html"> |
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| Address Federation |
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| </a> |
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| <li class="chapter " data-level="1.60.2" data-path="federation-queue.html"> |
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| <a href="federation-queue.html"> |
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| Queue Federation |
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| </a> |
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| High Availability and Failover |
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| </a> |
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| <a href="graceful-shutdown.html"> |
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| Graceful Server Shutdown |
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| </a> |
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| <li class="chapter " data-level="1.63" data-path="libaio.html"> |
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| <a href="libaio.html"> |
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| Libaio Native Libraries |
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| </a> |
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| <li class="chapter " data-level="1.64" data-path="thread-pooling.html"> |
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| <a href="thread-pooling.html"> |
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| Thread management |
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| </a> |
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| <li class="chapter " data-level="1.65" data-path="web-server.html"> |
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| <a href="web-server.html"> |
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| Embedded Web Server |
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| </a> |
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| <li class="chapter " data-level="1.66" data-path="logging.html"> |
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| <a href="logging.html"> |
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| Logging |
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| <a href="rest.html"> |
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| REST Interface |
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| </a> |
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| <li class="chapter " data-level="1.68" data-path="embedding-activemq.html"> |
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| <a href="embedding-activemq.html"> |
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| Embedding the Broker |
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| </a> |
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| <a href="karaf.html"> |
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| Apache Karaf |
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| Apache Tomcat |
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| Spring Integration |
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| <li class="chapter " data-level="1.72" data-path="cdi-integration.html"> |
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| <a href="cdi-integration.html"> |
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| CDI Integration |
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| </a> |
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| <li class="chapter " data-level="1.73" data-path="intercepting-operations.html"> |
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| Intercepting Operations |
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| </a> |
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| <a href="data-tools.html"> |
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| Data Tools |
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| <a href="maven-plugin.html"> |
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| <a href="." >Architecture</a> |
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| <h1 id="core-architecture">Core Architecture</h1> |
| <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>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 (although JDBC is still an option if necessary).</p> |
| <p>Apache ActiveMQ Artemis clients, potentially on different physical machines, |
| interact with the Apache ActiveMQ Artemis broker. Apache ActiveMQ Artemis |
| currently ships two API implementations for messaging at the client side:</p> |
| <ol> |
| <li><p>Core client API. This is a simple intuitive Java API that is aligned with |
| the Artemis internal Core. Allowing more control of broker objects (e.g |
| direct creation of addresses and queues). The Core API also offers a full set |
| of messaging functionality without some of the complexities of JMS.</p> |
| </li> |
| <li><p>JMS 2.0 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> |
| <ul> |
| <li>AMQP</li> |
| <li>OpenWire</li> |
| <li>MQTT</li> |
| <li>STOMP</li> |
| <li>HornetQ (for use with HornetQ clients).</li> |
| <li>Core (Artemis CORE protocol)</li> |
| </ul> |
| <p>JMS semantics are implemented by a JMS facade layer on the client side.</p> |
| <p>The Apache ActiveMQ Artemis broker 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 core protocol.</p> |
| <p>The broker 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="stand-alone-broker">Stand-alone Broker</h2> |
| <p>The normal stand-alone messaging broker configuration comprises a core |
| messaging broker and a number of protocol managers that provide support for the |
| various protocol mentioned earlier.</p> |
| <p>The stand-alone broker configuration uses |
| <a href="https://github.com/airlift/airline" target="_blank">Airline</a> for bootstrapping the Broker.</p> |
| <p>The stand-alone broker 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> |
| <h2 id="embedded-broker">Embedded Broker</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 broker you can directly |
| instantiate and embed brokers in your own application.</p> |
| <p>Read more about <a href="embedding-activemq.html">embedding Apache ActiveMQ Artemis</a>.</p> |
| <h2 id="integrated-with-a-java-ee-application-server">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> |
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