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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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| 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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| Graceful Server Shutdown |
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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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| 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="." >Extra Acknowledge Modes</a> |
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| <h1 id="extra-acknowledge-modes">Extra Acknowledge Modes</h1> |
| <p>JMS specifies 3 acknowledgement modes:</p> |
| <ul> |
| <li><p><code>AUTO_ACKNOWLEDGE</code></p> |
| </li> |
| <li><p><code>CLIENT_ACKNOWLEDGE</code></p> |
| </li> |
| <li><p><code>DUPS_OK_ACKNOWLEDGE</code></p> |
| </li> |
| </ul> |
| <p>Apache ActiveMQ Artemis supports two additional modes: <code>PRE_ACKNOWLEDGE</code> and |
| <code>INDIVIDUAL_ACKNOWLEDGE</code></p> |
| <p>In some cases you can afford to lose messages in event of failure, so it |
| would make sense to acknowledge the message on the server <em>before</em> |
| delivering it to the client.</p> |
| <p>This extra mode is supported by Apache ActiveMQ Artemis and will call it |
| <em>pre-acknowledge</em> mode.</p> |
| <p>The disadvantage of acknowledging on the server before delivery is that |
| the message will be lost if the system crashes <em>after</em> acknowledging the |
| message on the server but <em>before</em> it is delivered to the client. In |
| that case, the message is lost and will not be recovered when the system |
| restart.</p> |
| <p>Depending on your messaging case, <code>preAcknowledgement</code> mode can avoid |
| extra network traffic and CPU at the cost of coping with message loss.</p> |
| <p>An example of a use case for pre-acknowledgement is for stock price |
| update messages. With these messages it might be reasonable to lose a |
| message in event of crash, since the next price update message will |
| arrive soon, overriding the previous price.</p> |
| <blockquote> |
| <p><strong>Note:</strong></p> |
| <p>Please note, that if you use pre-acknowledge mode, then you will lose |
| transactional semantics for messages being consumed, since clearly |
| they are being acknowledged first on the server, not when you commit |
| the transaction. This may be stating the obvious but we like to be |
| clear on these things to avoid confusion!</p> |
| </blockquote> |
| <h2 id="using-preacknowledge">Using PRE_ACKNOWLEDGE</h2> |
| <p>This can be configured by setting the boolean URL parameter <code>preAcknowledge</code> |
| to <code>true</code>.</p> |
| <p>Alternatively, when using the JMS API, create a JMS Session with the |
| <code>ActiveMQSession.PRE_ACKNOWLEDGE</code> constant.</p> |
| <pre><code class="lang-java"><span class="hljs-comment">// messages will be acknowledge on the server *before* being delivered to the client</span> |
| Session session = connection.createSession(<span class="hljs-keyword">false</span>, ActiveMQJMSConstants.PRE_ACKNOWLEDGE); |
| </code></pre> |
| <h2 id="individual-acknowledge">Individual Acknowledge</h2> |
| <p>A valid use-case for individual acknowledgement would be when you need |
| to have your own scheduling and you don't know when your message |
| processing will be finished. You should prefer having one consumer per |
| thread worker but this is not possible in some circumstances depending |
| on how complex is your processing. For that you can use the individual |
| acknowledgement.</p> |
| <p>You basically setup Individual ACK by creating a session with the |
| acknowledge mode with <code>ActiveMQJMSConstants.INDIVIDUAL_ACKNOWLEDGE</code>. |
| Individual ACK inherits all the semantics from Client Acknowledge, with |
| the exception the message is individually acked.</p> |
| <blockquote> |
| <p><strong>Note:</strong></p> |
| <p>Please note, that to avoid confusion on MDB processing, Individual |
| ACKNOWLEDGE is not supported through MDBs (or the inbound resource |
| adapter). this is because you have to finish the process of your |
| message inside the MDB.</p> |
| </blockquote> |
| <h2 id="example">Example</h2> |
| <p>See the <a href="examples.html#pre-acknowledge">Pre-acknowledge Example</a> which shows how |
| to use pre-acknowledgement mode with JMS.</p> |
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