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| Non-Destructive 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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| 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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| Duplicate Message Detection |
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| Clusters |
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| Federation |
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| Address Federation |
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| Queue Federation |
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| High Availability and Failover |
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| Connection Routers |
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| Graceful Server Shutdown |
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| Libaio Native Libraries |
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| Thread management |
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| Embedded Web Server |
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| Logging |
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| <a href="." >Non-Destructive Queues</a> |
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| <h1 id="non-destructive-queues">Non-Destructive Queues</h1> |
| <p>When a consumer attaches to a queue, the normal behaviour is that messages are |
| sent to that consumer are acquired exclusively by that consumer, and when the |
| consumer acknowledges them, the messages are removed from the queue.</p> |
| <p>Another common pattern is to have queue "browsers" which send all messages to |
| the browser, but do not prevent other consumers from receiving the messages, |
| and do not remove them from the queue when the browser is done with them. Such |
| a browser is an instance of a "non-destructive" consumer.</p> |
| <p>If every consumer on a queue is non destructive then we can obtain some |
| interesting behaviours. In the case of a <a href="last-value-queues.html">last value |
| queue</a> then the queue will always contain the most up to |
| date value for every key.</p> |
| <p>A queue can be created to enforce all consumers are non-destructive using the |
| following queue configuration:</p> |
| <pre><code class="lang-xml"><span class="hljs-tag"><<span class="hljs-name">address</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"foo.bar"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">multicast</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">queue</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"orders1"</span> <span class="hljs-attr">non-destructive</span>=<span class="hljs-string">"true"</span> /></span> |
| <span class="hljs-tag"></<span class="hljs-name">multicast</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">address</span>></span> |
| </code></pre> |
| <p>Or on auto-create when using the JMS client by using address parameters when |
| creating the destination used by the consumer.</p> |
| <pre><code class="lang-java">Queue queue = session.createQueue(<span class="hljs-string">"my.destination.name?non-destructive=true"</span>); |
| Topic topic = session.createTopic(<span class="hljs-string">"my.destination.name?non-destructive=true"</span>); |
| </code></pre> |
| <p>Also the default for all queues under and address can be defaulted using the |
| <code>address-setting</code> configuration:</p> |
| <pre><code class="lang-xml"><span class="hljs-tag"><<span class="hljs-name">address-setting</span> <span class="hljs-attr">match</span>=<span class="hljs-string">"nonDestructiveQueue"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">default-non-destructive</span>></span>true<span class="hljs-tag"></<span class="hljs-name">default-non-destructive</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">address-setting</span>></span> |
| </code></pre> |
| <p>By default, <code>default-non-destructive</code> is <code>false</code>.</p> |
| <h2 id="limiting-the-size-of-the-queue">Limiting the Size of the Queue</h2> |
| <p>For queues other than last-value queues, having only non-destructive consumers |
| could mean that messages would never get deleted, leaving the queue to grow |
| without constraint. To prevent this you can use the ability to set a default |
| <code>expiry-delay</code>. See <a href="message-expiry.html#configuring-expiry-delay">expiry-delay</a> |
| for more details on this. You could also use a <a href="ring-queues.html">ring queue</a>.</p> |
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