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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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| <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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| 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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| <a href="ha.html"> |
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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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| <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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| <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> |
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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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| <a href="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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| <h1> |
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| <a href="." >Core Bridges</a> |
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| <h1 id="core-bridges">Core Bridges</h1> |
| <p>The function of a bridge is to consume messages from a source queue, and |
| forward them to a target address, typically on a different Apache ActiveMQ |
| Artemis server.</p> |
| <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, or internet and where the connection may be |
| unreliable.</p> |
| <p>The bridge has built in resilience to failure so if the target server |
| connection is lost, e.g. due to network failure, the bridge will retry |
| connecting to the target until it comes back online. When it comes back online |
| it will resume operation as normal.</p> |
| <p>In summary, bridges are a way to reliably connect two separate Apache ActiveMQ |
| Artemis servers together. With a core bridge both source and target servers |
| must be Apache ActiveMQ Artemis servers.</p> |
| <p>Bridges can be configured to provide <em>once and only once</em> delivery guarantees |
| even in the event of the failure of the source or the target server. They do |
| this by using duplicate detection (described in <a href="duplicate-detection.html">Duplicate |
| Detection</a>).</p> |
| <blockquote> |
| <p><strong>Note:</strong></p> |
| <p>Although they have similar function, don't confuse core bridges with JMS |
| bridges!</p> |
| <p>Core bridges are for linking an Apache ActiveMQ Artemis node with another |
| Apache ActiveMQ Artemis node and do not use the JMS API. A JMS Bridge is used |
| for linking any two JMS 1.1 compliant JMS providers. So, a JMS Bridge could |
| be used for bridging to or from different JMS compliant messaging system. |
| It's always preferable to use a core bridge if you can. Core bridges use |
| duplicate detection to provide <em>once and only once</em> guarantees. To provide |
| the same guarantee using a JMS bridge you would have to use XA which has a |
| higher overhead and is more complex to configure.</p> |
| </blockquote> |
| <h2 id="configuring-bridges">Configuring Bridges</h2> |
| <p>Bridges are configured in <code>broker.xml</code>. Let's kick off with an example (this is |
| actually from the bridge example):</p> |
| <pre><code class="lang-xml"><span class="hljs-tag"><<span class="hljs-name">bridge</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"my-bridge"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">queue-name</span>></span>sausage-factory<span class="hljs-tag"></<span class="hljs-name">queue-name</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">forwarding-address</span>></span>mincing-machine<span class="hljs-tag"></<span class="hljs-name">forwarding-address</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">filter</span> <span class="hljs-attr">string</span>=<span class="hljs-string">"name='aardvark'"</span>/></span> |
| <span class="hljs-tag"><<span class="hljs-name">transformer-class-name</span>></span> |
| org.apache.activemq.artemis.jms.example.HatColourChangeTransformer |
| <span class="hljs-tag"></<span class="hljs-name">transformer-class-name</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">retry-interval</span>></span>1000<span class="hljs-tag"></<span class="hljs-name">retry-interval</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">ha</span>></span>true<span class="hljs-tag"></<span class="hljs-name">ha</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">retry-interval-multiplier</span>></span>1.0<span class="hljs-tag"></<span class="hljs-name">retry-interval-multiplier</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">initial-connect-attempts</span>></span>-1<span class="hljs-tag"></<span class="hljs-name">initial-connect-attempts</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">reconnect-attempts</span>></span>-1<span class="hljs-tag"></<span class="hljs-name">reconnect-attempts</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">failover-on-server-shutdown</span>></span>false<span class="hljs-tag"></<span class="hljs-name">failover-on-server-shutdown</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">use-duplicate-detection</span>></span>true<span class="hljs-tag"></<span class="hljs-name">use-duplicate-detection</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">confirmation-window-size</span>></span>10000000<span class="hljs-tag"></<span class="hljs-name">confirmation-window-size</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">user</span>></span>foouser<span class="hljs-tag"></<span class="hljs-name">user</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">password</span>></span>foopassword<span class="hljs-tag"></<span class="hljs-name">password</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">routing-type</span>></span>PASS<span class="hljs-tag"></<span class="hljs-name">routing-type</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">static-connectors</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">connector-ref</span>></span>remote-connector<span class="hljs-tag"></<span class="hljs-name">connector-ref</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">static-connectors</span>></span> |
| <span class="hljs-comment"><!-- alternative to static-connectors |
| <discovery-group-ref discovery-group-name="bridge-discovery-group"/> |
| --></span> |
| <span class="hljs-tag"></<span class="hljs-name">bridge</span>></span> |
| </code></pre> |
| <p>In the above example we have shown all the parameters its possible to configure |
| for a bridge. In practice you might use many of the defaults so it won't be |
| necessary to specify them all explicitly.</p> |
| <p>Let's take a look at all the parameters in turn:</p> |
| <ul> |
| <li><p><code>name</code> attribute. All bridges must have a unique name in the server.</p> |
| </li> |
| <li><p><code>queue-name</code>. This is the unique name of the local queue that the bridge |
| consumes from, it's a mandatory parameter.</p> |
| <p>The queue must already exist by the time the bridge is instantiated at |
| start-up.</p> |
| </li> |
| <li><p><code>forwarding-address</code>. This is the address on the target server that the |
| message will be forwarded to. If a forwarding address is not specified, then |
| the original address of the message will be retained.</p> |
| </li> |
| <li><p><code>filter-string</code>. An optional filter string can be supplied. If specified then |
| only messages which match the filter expression specified in the filter |
| string will be forwarded. The filter string follows the ActiveMQ Artemis filter |
| expression syntax described in <a href="filter-expressions.html">Filter Expressions</a>.</p> |
| </li> |
| <li><p><code>transformer-class-name</code>. An <em>optional</em> transformer can be specified. This |
| gives you the opportunity to transform the message's header or body before |
| forwarding it. See the <a href="transformers.html">transformer chapter</a> for more details |
| about transformer-specific configuration.</p> |
| </li> |
| <li><p><code>ha</code>. This optional parameter determines whether or not this bridge should |
| support high availability. True means it will connect to any available server |
| in a cluster and support failover. The default value is <code>false</code>.</p> |
| </li> |
| <li><p><code>retry-interval</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>retry-interval-multiplier</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>retry-interval</code>to <code>1000</code> ms and we set <code>retry-interval-multiplier</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>initial-connect-attempts</code>. This optional parameter determines the total |
| number of initial connect attempts the bridge will make before giving up and |
| shutting down. A value of <code>-1</code> signifies an unlimited number of attempts. The |
| default value is <code>-1</code>.</p> |
| </li> |
| <li><p><code>reconnect-attempts</code>. This optional parameter determines the total number of |
| reconnect attempts the bridge will make before giving up and shutting down. A |
| value of <code>-1</code> signifies an unlimited number of attempts. The default value is |
| <code>-1</code>.</p> |
| </li> |
| <li><p><code>failover-on-server-shutdown</code>. This optional parameter determines whether the |
| bridge will attempt to failover onto a backup server (if specified) when the |
| target server is cleanly shutdown rather than crashed.</p> |
| <p>The bridge connector can specify both a live and a backup server, if it |
| specifies a backup server and this parameter is set to <code>true</code> then if the |
| target server is <em>cleanly</em> shutdown the bridge connection will attempt to |
| failover onto its backup. If the bridge connector has no backup server |
| configured then this parameter has no effect.</p> |
| <p>Sometimes you want a bridge configured with a live and a backup target |
| server, but you don't want to failover to the backup if the live server is |
| simply taken down temporarily for maintenance, this is when this parameter |
| comes in handy.</p> |
| <p>The default value for this parameter is <code>false</code>.</p> |
| </li> |
| <li><p><code>use-duplicate-detection</code>. This optional parameter determines whether the |
| bridge will automatically insert a duplicate id property into each message |
| that it forwards.</p> |
| <p>Doing so, allows the target server to perform duplicate detection on messages |
| it receives from the source server. If the connection fails or server crashes, |
| then, when the bridge resumes it will resend unacknowledged messages. This |
| might result in duplicate messages being sent to the target server. By enabling |
| duplicate detection allows these duplicates to be screened out and ignored.</p> |
| <p>This allows the bridge to provide a <em>once and only once</em> delivery guarantee |
| without using heavyweight methods such as XA (see <a href="duplicate-detection.html">Duplicate |
| Detection</a> for more information).</p> |
| <p>The default value for this parameter is <code>true</code>.</p> |
| </li> |
| <li><p><code>confirmation-window-size</code>. This optional parameter determines the |
| <code>confirmation-window-size</code> to use for the connection used to forward messages |
| to the target node. This attribute is described in section <a href="client-reconnection.html">Reconnection and |
| Session Reattachment</a></p> |
| <blockquote> |
| <p><strong>Warning</strong></p> |
| <p>When using the bridge to forward messages to an address which uses the |
| <code>BLOCK</code> <code>address-full-policy</code> from a queue which has a <code>max-size-bytes</code> set |
| it's important that <code>confirmation-window-size</code> is less than or equal to |
| <code>max-size-bytes</code> to prevent the flow of messages from ceasing.</p> |
| </blockquote> |
| </li> |
| <li><p><code>producer-window-size</code>. This optional parameter determines the producer flow |
| control through the bridge. You usually leave this off unless you are dealing |
| with huge large messages. </p> |
| <p>Default=-1 (disabled)</p> |
| </li> |
| <li><p><code>user</code>. This optional parameter determines the user name to use when creating |
| the bridge connection to the remote server. If it is not specified the |
| default cluster user specified by <code>cluster-user</code> in <code>broker.xml</code> will be used.</p> |
| </li> |
| <li><p><code>password</code>. This optional parameter determines the password to use when |
| creating the bridge connection to the remote server. If it is not specified |
| the default cluster password specified by <code>cluster-password</code> in <code>broker.xml</code> |
| will be used.</p> |
| </li> |
| <li><p><code>routing-type</code>. Bridges can apply a particular routing-type to the messages it |
| forwards, strip the existing routing type, or simply pass the existing |
| routing-type through. This is useful in situations where the message may have |
| its routing-type set but you want to bridge it to an address using a different |
| routing-type. It's important to keep in mind that a message with the <code>anycast</code> |
| routing-type will not actually be routed to queues using <code>multicast</code> and |
| vice-versa. By configuring the <code>routing-type</code> of the bridge you have the |
| flexibility to deal with any situation. Valid values are <code>ANYCAST</code>, |
| <code>MULTICAST</code>, <code>PASS</code>, & <code>STRIP</code>. The default is <code>PASS</code>.</p> |
| </li> |
| <li><p><code>static-connectors</code> or <code>discovery-group-ref</code>. Pick either of these options to |
| connect the bridge to the target server.</p> |
| <p>The <code>static-connectors</code> is a list of <code>connector-ref</code> elements pointing to |
| <code>connector</code> elements defined elsewhere. A <em>connector</em> encapsulates knowledge of |
| what transport to use (TCP, SSL, HTTP etc) as well as the server connection |
| parameters (host, port etc). For more information about what connectors are and |
| how to configure them, please see <a href="configuring-transports.html">Configuring the |
| Transport</a>.</p> |
| <p>The <code>discovery-group-ref</code> element has one attribute - <code>discovery-group-name</code>. |
| This attribute points to a <code>discovery-group</code> defined elsewhere. For more |
| information about what discovery-groups are and how to configure them, please |
| see <a href="clusters.html">Discovery Groups</a>.</p> |
| </li> |
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