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| Retroactive Addresses |
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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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| Duplicate Message Detection |
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| Clusters |
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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 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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| Graceful Server Shutdown |
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| <a href="libaio.html"> |
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| Libaio Native Libraries |
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| </a> |
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| Thread management |
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| Embedded Web Server |
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| Logging |
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| <a href="rest.html"> |
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| REST Interface |
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| Embedding the Broker |
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| Apache Karaf |
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| Apache Tomcat |
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| Spring Integration |
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| CDI Integration |
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| Intercepting Operations |
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| Data Tools |
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| <a href="." >Retroactive Addresses</a> |
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| <h1 id="retroactive-addresses">Retroactive Addresses</h1> |
| <p>A "retroactive" address is an address that will preserve messages sent to it |
| for queues which will be created on it in the future. This can be useful in, |
| for example, publish-subscribe use cases where clients want to receive the |
| messages sent to the address <em>before</em> they they actually connected and created |
| their multicast "subscription" queue. Typically messages sent to an address |
| before a queue was created on it would simply be unavailable to those queues, |
| but with a retroactive address a fixed number of messages can be preserved by |
| the broker and automatically copied into queues subsequently created on the |
| address. This works for both anycast and multicast queues.</p> |
| <h2 id="internal-retroactive-resources">Internal Retroactive Resources</h2> |
| <p>To implement this functionality the broker will create 4 internal resources for |
| each retroactive address:</p> |
| <ol> |
| <li>A non-exclusive <a href="#diverts">divert</a> to grab the messages from the retroactive |
| address.</li> |
| <li>An address to receive the messages from the divert.</li> |
| <li><strong>Two</strong> <a href="#ring-queues">ring queues</a> to hold the messages sent to the address |
| by the divert - one for anycast and one for multicast. The general caveats |
| for ring queues still apply here. See <a href="#ring-queues">the chapter on ring queues</a> |
| for more details.</li> |
| </ol> |
| <p>These resources are important to be aware of as they will show up in the web |
| console and other management or metric views. They will be named according to |
| the following pattern:</p> |
| <pre><code><internal-naming-prefix><delimiter><source-address><delimiter>(divert|address|queue<delimiter>(anycast|multicast))<delimiter>retro |
| </code></pre><p>For example, if an address named <code>myAddress</code> had a <code>retroactive-message-count</code> |
| of 10 and the default <code>internal-naming-prefix</code> (i.e. <code>$.artemis.internal.</code>) and |
| the default delimiter (i.e. <code>.</code>) were being used then resources with these names |
| would be created:</p> |
| <ol> |
| <li>A divert on <code>myAddress</code> named <code>$.artemis.internal.myAddress.divert.retro</code></li> |
| <li>An address named <code>$.artemis.internal.myAddress.address.retro</code></li> |
| <li>A multicast queue on the address from step #2 named |
| <code>$.artemis.internal.myAddress.queue.multicast.retro</code> with a <code>ring-size</code> of 10.</li> |
| <li>An anycast queue on the address from step #2 named |
| <code>$.artemis.internal.myAddress.queue.anycast.retro</code> with a <code>ring-size</code> of 10.</li> |
| </ol> |
| <p>This pattern is important to note as it allows one to configure address-settings |
| if necessary. To configure custom address-settings you'd use a match like:</p> |
| <pre><code>*.*.*.<source-address>.*.retro |
| </code></pre><p>Using the same example as above the <code>match</code> would be:</p> |
| <pre><code>*.*.*.myAddress.*.retro |
| </code></pre><blockquote> |
| <p>Note:</p> |
| <p>Changing the broker's <code>internal-naming-prefix</code> once these retroactive |
| resources are created will break the retroactive functionality.</p> |
| </blockquote> |
| <h2 id="configuration">Configuration</h2> |
| <p>To configure an address to be "retroactive" simply configure the |
| <code>retroactive-message-count</code> <code>address-setting</code> to reflect the number of messages |
| you want the broker to preserve, e.g.:</p> |
| <pre><code class="lang-xml"><span class="hljs-tag"><<span class="hljs-name">address-settings</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">address-setting</span> <span class="hljs-attr">match</span>=<span class="hljs-string">"orders"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">retroactive-message-count</span>></span>100<span class="hljs-tag"></<span class="hljs-name">retroactive-message-count</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">address-setting</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">address-settings</span>></span> |
| </code></pre> |
| <p>The value for <code>retroactive-message-count</code> can be updated at runtime either via |
| <code>broker.xml</code> or via the management API just like any other address-setting. |
| However, if you <em>reduce</em> the value of <code>retroactive-message-count</code> an additional |
| administrative step will be required since this functionality is implemented |
| via ring queues. This is because a ring queue whose ring-size is reduced will |
| not automatically delete messages from the queue to meet the new ring-size in |
| order to avoid unintended message loss. Therefore, administrative action will |
| be required in this case to manually reduce the number of messages in the ring |
| queue via the management API.</p> |
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