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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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| 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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| Duplicate Message Detection |
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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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| Graceful Server Shutdown |
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| </a> |
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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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| <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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| </a> |
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| Apache Tomcat |
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| Spring Integration |
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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 href="data-tools.html"> |
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| Data Tools |
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| <a href="maven-plugin.html"> |
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| <h1> |
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| <a href="." >The JMS Bridge</a> |
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| <h1 id="the-jms-bridge">The JMS Bridge</h1> |
| <p>Apache ActiveMQ Artemis includes a fully functional JMS message bridge.</p> |
| <p>The function of the bridge is to consume messages from a source queue or topic, |
| and send them to a target queue or topic, typically on a different server.</p> |
| <blockquote> |
| <p><strong>Note:</strong></p> |
| <p>The JMS Bridge is not intended as a replacement for transformation and more |
| expert systems such as Camel. The JMS Bridge may be useful for fast |
| transfers as this chapter covers, but keep in mind that more complex |
| scenarios requiring transformations will require you to use a more advanced |
| transformation system that will play on use cases that will go beyond Apache |
| ActiveMQ Artemis.</p> |
| </blockquote> |
| <p>The source and target servers do not have to be in the same cluster which makes |
| bridging suitable for reliably sending messages from one cluster to another, |
| for instance across a WAN, and where the connection may be unreliable.</p> |
| <p>A bridge can be deployed as a standalone application or as a web application |
| managed by the embedded Jetty instance bootstrapped with Apache ActiveMQ |
| Artemis. The source and the target can be located in the same virtual machine |
| or another one.</p> |
| <p>The bridge can also be used to bridge messages from other non Apache ActiveMQ |
| Artemis JMS servers, as long as they are JMS 1.1 compliant.</p> |
| <blockquote> |
| <p><strong>Note:</strong></p> |
| <p>Do not confuse a JMS bridge with a core bridge. A JMS bridge can be used to |
| bridge any two JMS 1.1 compliant JMS providers and uses the JMS API. A <a href="core-bridges.html">core |
| bridge</a>) is used to bridge any two Apache ActiveMQ Artemis |
| instances and uses the core API. Always use a core bridge if you can in |
| preference to a JMS bridge. The core bridge will typically provide better |
| performance than a JMS bridge. Also the core bridge can provide <em>once and |
| only once</em> delivery guarantees without using XA.</p> |
| </blockquote> |
| <p>The bridge has built-in resilience to failure so if the source or target server |
| connection is lost, e.g. due to network failure, the bridge will retry |
| connecting to the source and/or target until they come back online. When it |
| comes back online it will resume operation as normal.</p> |
| <p>The bridge can be configured with an optional JMS selector, so it will only |
| consume messages matching that JMS selector</p> |
| <p>It can be configured to consume from a queue or a topic. When it consumes from |
| a topic it can be configured to consume using a non durable or durable |
| subscription</p> |
| <p>The JMS Bridge is a simple POJO so can be deployed with most frameworks, simply |
| instantiate the <code>org.apache.activemq.artemis.api.jms.bridge.impl.JMSBridgeImpl</code> |
| class and set the appropriate parameters.</p> |
| <h2 id="jms-bridge-parameters">JMS Bridge Parameters</h2> |
| <p>The main POJO is the <code>JMSBridge</code>. It is is configurable by the parameters |
| passed to its constructor.</p> |
| <ul> |
| <li><p>Source Connection Factory Factory</p> |
| <p>This injects the <code>SourceCFF</code> bean (also defined in the beans file). This |
| bean is used to create the <em>source</em> <code>ConnectionFactory</code></p> |
| </li> |
| <li><p>Target Connection Factory Factory</p> |
| <p>This injects the <code>TargetCFF</code> bean (also defined in the beans file). This |
| bean is used to create the <em>target</em> <code>ConnectionFactory</code></p> |
| </li> |
| <li><p>Source Destination Factory Factory</p> |
| <p>This injects the <code>SourceDestinationFactory</code> bean (also defined in the beans |
| file). This bean is used to create the <em>source</em> <code>Destination</code></p> |
| </li> |
| <li><p>Target Destination Factory Factory</p> |
| <p>This injects the <code>TargetDestinationFactory</code> bean (also defined in the beans |
| file). This bean is used to create the <em>target</em> <code>Destination</code></p> |
| </li> |
| <li><p>Source User Name</p> |
| <p>this parameter is the username for creating the <em>source</em> connection</p> |
| </li> |
| <li><p>Source Password</p> |
| <p>this parameter is the parameter for creating the <em>source</em> connection</p> |
| </li> |
| <li><p>Target User Name</p> |
| <p>this parameter is the username for creating the <em>target</em> connection</p> |
| </li> |
| <li><p>Target Password</p> |
| <p>this parameter is the password for creating the <em>target</em> connection</p> |
| </li> |
| <li><p>Selector</p> |
| <p>This represents a JMS selector expression used for consuming |
| messages from the source destination. Only messages that match the |
| selector expression will be bridged from the source to the target |
| destination</p> |
| <p>The selector expression must follow the <a href="https://docs.oracle.com/javaee/7/api/javax/jms/Message.html" target="_blank">JMS selector |
| syntax</a></p> |
| </li> |
| <li><p>Failure Retry Interval</p> |
| <p>This represents the amount of time in ms to wait between trying to recreate |
| connections to the source or target servers when the bridge has detected they |
| have failed</p> |
| </li> |
| <li><p>Max Retries</p> |
| <p>This represents the number of times to attempt to recreate connections to the |
| source or target servers when the bridge has detected they have failed. The |
| bridge will give up after trying this number of times. <code>-1</code> represents 'try |
| forever'</p> |
| </li> |
| <li><p>Quality Of Service</p> |
| <p>This parameter represents the desired quality of service mode</p> |
| <p>Possible values are:</p> |
| <ul> |
| <li><p><code>AT_MOST_ONCE</code></p> |
| </li> |
| <li><p><code>DUPLICATES_OK</code></p> |
| </li> |
| <li><p><code>ONCE_AND_ONLY_ONCE</code></p> |
| </li> |
| </ul> |
| <p>See Quality Of Service section for an explanation of these modes.</p> |
| </li> |
| <li><p>Max Batch Size</p> |
| <p>This represents the maximum number of messages to consume from the source |
| destination before sending them in a batch to the target destination. Its value |
| must <code>>= 1</code></p> |
| </li> |
| <li><p>Max Batch Time</p> |
| <p>This represents the maximum number of milliseconds to wait before sending a |
| batch to target, even if the number of messages consumed has not reached |
| <code>MaxBatchSize</code>. Its value must be <code>-1</code> to represent 'wait forever', or <code>>= 1</code> |
| to specify an actual time</p> |
| </li> |
| <li><p>Subscription Name</p> |
| <p>If the source destination represents a topic, and you want to consume from |
| the topic using a durable subscription then this parameter represents the |
| durable subscription name</p> |
| </li> |
| <li><p>Client ID</p> |
| <p>If the source destination represents a topic, and you want to consume from |
| the topic using a durable subscription then this attribute represents the the |
| JMS client ID to use when creating/looking up the durable subscription</p> |
| </li> |
| <li><p>Add MessageID In Header</p> |
| <p>If <code>true</code>, then the original message's message ID will be appended in the |
| message sent to the destination in the header <code>ACTIVEMQ_BRIDGE_MSG_ID_LIST</code>. If |
| the message is bridged more than once, each message ID will be appended. This |
| enables a distributed request-response pattern to be used</p> |
| <blockquote> |
| <p><strong>Note:</strong></p> |
| <p>when you receive the message you can send back a response using the |
| correlation id of the first message id, so when the original sender gets it |
| back it will be able to correlate it.</p> |
| </blockquote> |
| </li> |
| <li><p>MBean Server</p> |
| <p>To manage the JMS Bridge using JMX, set the MBeanServer where the JMS Bridge |
| MBean must be registered (e.g. the JVM Platform MBeanServer)</p> |
| </li> |
| <li><p>ObjectName</p> |
| <p>If you set the MBeanServer, you also need to set the ObjectName used to |
| register the JMS Bridge MBean (must be unique)</p> |
| </li> |
| </ul> |
| <p>The "transactionManager" property points to a JTA transaction manager |
| implementation and should be set if you need to use the 'ONCE_AND_ONCE_ONLY' |
| Quality of Service. Apache ActiveMQ Artemis doesn't ship with such an |
| implementation, but if you are running within an Application Server you can |
| inject the Transaction Manager that is shipped.</p> |
| <h2 id="source-and-target-connection-factories">Source and Target Connection Factories</h2> |
| <p>The source and target connection factory factories are used to create the |
| connection factory used to create the connection for the source or target |
| server.</p> |
| <p>The configuration example above uses the default implementation provided by |
| Apache ActiveMQ Artemis that looks up the connection factory using JNDI. For |
| other Application Servers or JMS providers a new implementation may have to be |
| provided. This can easily be done by implementing the interface |
| <code>org.apache.activemq.artemis.jms.bridge.ConnectionFactoryFactory</code>.</p> |
| <h2 id="source-and-target-destination-factories">Source and Target Destination Factories</h2> |
| <p>Again, similarly, these are used to create or lookup up the destinations.</p> |
| <p>In the configuration example above, we have used the default provided by Apache |
| ActiveMQ Artemis that looks up the destination using JNDI.</p> |
| <p>A new implementation can be provided by implementing |
| <code>org.apache.activemq.artemis.jms.bridge.DestinationFactory</code> interface.</p> |
| <h2 id="quality-of-service">Quality Of Service</h2> |
| <p>The quality of service modes used by the bridge are described here in more |
| detail.</p> |
| <h3 id="atmostonce">AT_MOST_ONCE</h3> |
| <p>With this QoS mode messages will reach the destination from the source at most |
| once. The messages are consumed from the source and acknowledged before sending |
| to the destination. Therefore there is a possibility that if failure occurs |
| between removing them from the source and them arriving at the destination they |
| could be lost. Hence delivery will occur at most once.</p> |
| <p>This mode is available for both durable and non-durable messages.</p> |
| <h3 id="duplicatesok">DUPLICATES_OK</h3> |
| <p>With this QoS mode, the messages are consumed from the source and then |
| acknowledged after they have been successfully sent to the destination. |
| Therefore there is a possibility that if failure occurs after sending to the |
| destination but before acknowledging them, they could be sent again when the |
| system recovers. I.e. the destination might receive duplicates after a failure.</p> |
| <p>This mode is available for both durable and non-durable messages.</p> |
| <h3 id="onceandonlyonce">ONCE_AND_ONLY_ONCE</h3> |
| <p>This QoS mode ensures messages will reach the destination from the source once |
| and only once. (Sometimes this mode is known as "exactly once"). If both the |
| source and the destination are on the same Apache ActiveMQ Artemis server |
| instance then this can be achieved by sending and acknowledging the messages in |
| the same local transaction. If the source and destination are on different |
| servers this is achieved by enlisting the sending and consuming sessions in a |
| JTA transaction. The JTA transaction is controlled by a JTA Transaction Manager |
| which will need to be set via the settransactionManager method on the Bridge.</p> |
| <p>This mode is only available for durable messages.</p> |
| <blockquote> |
| <p><strong>Note:</strong></p> |
| <p>For a specific application it may possible to provide once and only once |
| semantics without using the ONCE_AND_ONLY_ONCE QoS level. This can be done |
| by using the DUPLICATES_OK mode and then checking for duplicates at the |
| destination and discarding them. Some JMS servers provide automatic duplicate |
| message detection functionality, or this may be possible to implement on the |
| application level by maintaining a cache of received message ids on disk and |
| comparing received messages to them. The cache would only be valid for a |
| certain period of time so this approach is not as watertight as using |
| ONCE_AND_ONLY_ONCE but may be a good choice depending on your specific |
| application.</p> |
| </blockquote> |
| <h3 id="time-outs-and-the-jms-bridge">Time outs and the JMS bridge</h3> |
| <p>There is a possibility that the target or source server will not be available |
| at some point in time. If this occurs then the bridge will try <code>Max Retries</code> to |
| reconnect every <code>Failure Retry Interval</code> milliseconds as specified in the JMS |
| Bridge definition.</p> |
| <p>If you implement your own factories for looking up JMS resources then you will |
| have to bear in mind timeout issues.</p> |
| <h3 id="examples">Examples</h3> |
| <p>Please see <a href="examples.html#jms-bridge">JMS Bridge Example</a> which shows how to |
| programmatically instantiate and configure a JMS Bridge to send messages to the |
| source destination and consume them from the target destination between two |
| standalone Apache ActiveMQ Artemis brokers.</p> |
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