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+ <a href="." >Message Redelivery and Undelivered Messages</a>
+ </h1>
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+
+ <h1 id="message-redelivery-and-undelivered-messages">Message Redelivery and Undelivered Messages</h1>
+<p>Messages can be delivered unsuccessfully (e.g. if the transacted session
+used to consume them is rolled back). Such a message goes back to its
+queue ready to be redelivered. However, this means it is possible for a
+message to be delivered again and again without success thus remaining
+in the queue indefinitely, clogging the system.</p>
+<p>There are 2 ways to deal with these undelivered messages:</p>
+<ul>
+<li><p>Delayed redelivery.</p>
+<p>It is possible to delay messages redelivery. This gives the client some
+time to recover from any transient failures and to prevent overloading
+its network or CPU resources.</p>
+</li>
+<li><p>Dead Letter Address.</p>
+<p>It is also possible to configure a dead letter address so that after
+a specified number of unsuccessful deliveries, messages are removed
+from their queue and sent to the dead letter address. These messages
+will not be delivered again from this queue.</p>
+</li>
+</ul>
+<p>Both options can be combined for maximum flexibility.</p>
+<h2 id="delayed-redelivery">Delayed Redelivery</h2>
+<p>Delaying redelivery can often be useful in cases where clients regularly
+fail or rollback. Without a delayed redelivery, the system can get into a
+"thrashing" state, with delivery being attempted, the client rolling back,
+and delivery being re-attempted ad infinitum in quick succession,
+consuming valuable CPU and network resources.</p>
+<h3 id="configuring-delayed-redelivery">Configuring Delayed Redelivery</h3>
+<p>Delayed redelivery is defined in the address-setting configuration:</p>
+<pre><code><!-- delay redelivery of messages for 5s -->
+<address-setting match="exampleQueue">
+<!-- default is 1.0 -->
+<redelivery-delay-multiplier>1.5</redelivery-delay-multiplier>
+<!-- default is 0 (no delay) -->
+<redelivery-delay>5000</redelivery-delay>
+<!-- default is redelivery-delay * 10 -->
+<max-redelivery-delay>50000</max-redelivery-delay>
+
+</address-setting>
+</code></pre><p>If a <code>redelivery-delay</code> is specified, Apache ActiveMQ Artemis will wait this delay
+before redelivering the messages.</p>
+<p>By default, there is no redelivery delay (<code>redelivery-delay</code>is set to
+0).</p>
+<p>Other subsequent messages will be delivery regularly, only the cancelled
+message will be sent asynchronously back to the queue after the delay.</p>
+<p>You can specify a multiplier (the <code>redelivery-delay-multiplier</code>) that will
+take effect on top of the <code>redelivery-delay</code>. Each time a message is redelivered
+the delay period will be equal to the previous delay <em> <code>redelivery-delay-multiplier</code>.
+A max-redelivery-delay can be set to prevent the delay from becoming too large.
+The max-redelivery-delay is defaulted to redelivery-delay \</em> 10.</p>
+<p>Example:</p>
+<pre><code>- redelivery-delay=5000, redelivery-delay-multiplier=2, max-redelivery-delay=15000
+
+1. Delivery Attempt 1. (Unsuccessful)
+2. Wait Delay Period: 5000
+3. Delivery Attempt 2. (Unsuccessful)
+4. Wait Delay Period: 10000 // (5000 * 2) < max-delay-period. Use 10000
+5. Delivery Attempt 3: (Unsuccessful)
+6. Wait Delay Period: 15000 // (10000 * 2) > max-delay-period: Use max-delay-delivery
+</code></pre><p>Address wildcards can be used to configure redelivery delay for a set of
+addresses (see <a href="wildcard-syntax.html">Understanding the Wildcard Syntax</a>), so you don't have to specify redelivery delay
+individually for each address.</p>
+<h3 id="example">Example</h3>
+<p>See <a href="examples.html">the examples chapter</a> for an example which shows how delayed redelivery is configured
+and used with JMS.</p>
+<h2 id="dead-letter-addresses">Dead Letter Addresses</h2>
+<p>To prevent a client infinitely receiving the same undelivered message
+(regardless of what is causing the unsuccessful deliveries), messaging
+systems define <em>dead letter addresses</em>: after a specified unsuccessful
+delivery attempts, the message is removed from its queue and sent
+to a dead letter address.</p>
+<p>Any such messages can then be diverted to queue(s) where they can later
+be perused by the system administrator for action to be taken.</p>
+<p>Apache ActiveMQ Artemis's addresses can be assigned a dead letter address. Once the
+messages have been unsuccessfully delivered for a given number of
+attempts, they are removed from their queue and sent to the relevant
+dead letter address. These <em>dead letter</em> messages can later be consumed
+from the dead letter address for further inspection.</p>
+<h3 id="configuring-dead-letter-addresses">Configuring Dead Letter Addresses</h3>
+<p>Dead letter address is defined in the address-setting configuration:</p>
+<pre><code><!-- undelivered messages in exampleQueue will be sent to the dead letter address
+deadLetterQueue after 3 unsuccessful delivery attempts -->
+<address-setting match="exampleQueue">
+<dead-letter-address>deadLetterQueue</dead-letter-address>
+<max-delivery-attempts>3</max-delivery-attempts>
+</address-setting>
+</code></pre><p>If a <code>dead-letter-address</code> is not specified, messages will removed after
+<code>max-delivery-attempts</code> unsuccessful attempts.</p>
+<p>By default, messages are redelivered 10 times at the maximum. Set
+<code>max-delivery-attempts</code> to -1 for infinite redeliveries.</p>
+<p>A <code>dead letter address</code> can be set globally for a set of matching
+addresses and you can set <code>max-delivery-attempts</code> to -1 for a specific
+address setting to allow infinite redeliveries only for this address.</p>
+<p>Address wildcards can be used to configure dead letter settings for a
+set of addresses (see <a href="wildcard-syntax.html">Understanding the Wildcard Syntax</a>).</p>
+<h3 id="dead-letter-properties">Dead Letter Properties</h3>
+<p>Dead letter messages which are consumed from a dead letter address have
+the following properties:</p>
+<ul>
+<li><p><code>_AMQ_ORIG_ADDRESS</code></p>
+<p>a String property containing the <em>original address</em> of the dead
+letter message</p>
+</li>
+<li><p><code>_AMQ_ORIG_QUEUE</code></p>
+<p>a String property containing the <em>original queue</em> of the dead letter
+message</p>
+</li>
+</ul>
+<h3 id="example">Example</h3>
+<p>See: Dead Letter section of the <a href="examples.html">Examples</a> for an example
+that shows how dead letter is configured and used with JMS.</p>
+<h2 id="delivery-count-persistence">Delivery Count Persistence</h2>
+<p>In normal use, Apache ActiveMQ Artemis does not update delivery count <em>persistently</em>
+until a message is rolled back (i.e. the delivery count is not updated
+<em>before</em> the message is delivered to the consumer). In most messaging
+use cases, the messages are consumed, acknowledged and forgotten as soon
+as they are consumed. In these cases, updating the delivery count
+persistently before delivering the message would add an extra persistent
+step <em>for each message delivered</em>, implying a significant performance
+penalty.</p>
+<p>However, if the delivery count is not updated persistently before the
+message delivery happens, in the event of a server crash, messages might
+have been delivered but that will not have been reflected in the
+delivery count. During the recovery phase, the server will not have
+knowledge of that and will deliver the message with <code>redelivered</code> set to
+<code>false</code> while it should be <code>true</code>.</p>
+<p>As this behavior breaks strict JMS semantics, Apache ActiveMQ Artemis allows to persist
+delivery count before message delivery but this feature is disabled by default
+due to performance implications.</p>
+<p>To enable it, set <code>persist-delivery-count-before-delivery</code> to <code>true</code> in
+<code>broker.xml</code>:</p>
+<pre><code><persist-delivery-count-before-delivery>true</persist-delivery-count-before-delivery>
+</code></pre>
+
+ </section>
+
+ </div>
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Added: websites/production/activemq/content/artemis/docs/latest/unit-testing.html
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--- websites/production/activemq/content/artemis/docs/latest/unit-testing.html (added)
+++ websites/production/activemq/content/artemis/docs/latest/unit-testing.html Thu Sep 14 19:48:11 2017
@@ -0,0 +1,1135 @@
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+ <li class="chapter " data-level="1.15" data-path="wildcard-routing.html">
+
+ <a href="wildcard-routing.html">
+
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+ Routing Messages With Wild Cards
+
+ </a>
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+
+ </li>
+
+ <li class="chapter " data-level="1.16" data-path="wildcard-syntax.html">
+
+ <a href="wildcard-syntax.html">
+
+
+ Understanding the Apache ActiveMQ Artemis Wildcard Syntax
+
+ </a>
+
+
+
+ </li>
+
+ <li class="chapter " data-level="1.17" data-path="filter-expressions.html">
+
+ <a href="filter-expressions.html">
+
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+ Filter Expressions
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+ </a>
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+
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+
+ <a href="persistence.html">
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+ Persistence
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+ </li>
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+ <li class="chapter " data-level="1.19" data-path="configuring-transports.html">
+
+ <a href="configuring-transports.html">
+
+
+ Configuring Transports
+
+ </a>
+
+
+
+ </li>
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+ <li class="chapter " data-level="1.20" data-path="config-reload.html">
+
+ <a href="config-reload.html">
+
+
+ Configuration Reload
+
+ </a>
+
+
+
+ </li>
+
+ <li class="chapter " data-level="1.21" data-path="connection-ttl.html">
+
+ <a href="connection-ttl.html">
+
+
+ Detecting Dead Connections
+
+ </a>
+
+
+
+ </li>
+
+ <li class="chapter " data-level="1.22" data-path="slow-consumers.html">
+
+ <a href="slow-consumers.html">
+
+
+ Detecting Slow Consumers
+
+ </a>
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+ <li class="chapter " data-level="1.23" data-path="network-isolation.html">
+
+ <a href="network-isolation.html">
+
+
+ Avoiding Network Isolation
+
+ </a>
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+
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+ </li>
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+ <li class="chapter " data-level="1.24" data-path="critical-analysis.html">
+
+ <a href="critical-analysis.html">
+
+
+ Detecting Broker Issues (Critical Analysis)
+
+ </a>
+
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+ </li>
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+ <li class="chapter " data-level="1.25" data-path="transaction-config.html">
+
+ <a href="transaction-config.html">
+
+
+ Resource Manager Configuration
+
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+
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+ Flow Control
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+ Guarantees of sends and commits
+
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+
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+
+ <li class="chapter " data-level="1.28" data-path="undelivered-messages.html">
+
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+ Message Redelivery and Undelivered Messages
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+ Message Expiry
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+ Message Grouping
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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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+ <li class="chapter " data-level="1.54" data-path="embedding-activemq.html">
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+ <a href="embedding-activemq.html">
+
+
+ Embedding Apache ActiveMQ Artemis
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+ Apache Karaf
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+
+
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+
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+
+ Spring Integration
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+ </a>
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+
+
+ </li>
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+ <li class="chapter " data-level="1.57" data-path="cdi-integration.html">
+
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+
+
+ </li>
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+
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+
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+ Intercepting Operations
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+ Protocols and Interoperability
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+
+ <h1 id="unit-testing">Unit Testing</h1>
+<p>The package <code>artemis-junit</code> provides tools to facilitate how to run Artemis resources inside Junit Tests.</p>
+<p>These are provided as junit rules and can make it easier to embed Messaging functionality on your tests.</p>
+<h2 id="example">Example</h2>
+<h3 id="import-this-on-your-pomxml">Import this on your pom.xml</h3>
+<pre><code class="lang-xml"><span class="hljs-tag"><<span class="hljs-name">dependency</span>></span>
+ <span class="hljs-tag"><<span class="hljs-name">groupId</span>></span>org.apache.activemq<span class="hljs-tag"></<span class="hljs-name">groupId</span>></span>
+ <span class="hljs-tag"><<span class="hljs-name">artifactId</span>></span>artemis-junit<span class="hljs-tag"></<span class="hljs-name">artifactId</span>></span>
+ <span class="hljs-comment"><!-- replace this for the version you are using --></span>
+ <span class="hljs-tag"><<span class="hljs-name">version</span>></span>1.5.0<span class="hljs-tag"></<span class="hljs-name">version</span>></span>
+ <span class="hljs-tag"><<span class="hljs-name">scope</span>></span>test<span class="hljs-tag"></<span class="hljs-name">scope</span>></span>
+<span class="hljs-tag"></<span class="hljs-name">dependency</span>></span>
+</code></pre>
+<h3 id="declare-a-rule-on-your-junit-test">Declare a rule on your JUnit Test</h3>
+<pre><code class="lang-java"><span class="hljs-keyword">import</span> org.apache.activemq.artemis.junit.EmbeddedJMSResource;
+<span class="hljs-keyword">import</span> org.junit.Rule;
+<span class="hljs-keyword">import</span> org.junit.Test;
+
+<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MyTest</span> </span>{
+
+ <span class="hljs-meta">@Rule</span>
+ <span class="hljs-keyword">public</span> EmbeddedJMSResource resource = <span class="hljs-keyword">new</span> EmbeddedJMSResource();
+
+ <span class="hljs-meta">@Test</span>
+ <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">myTest</span><span class="hljs-params">()</span> </span>{
+
+ }
+}
+</code></pre>
+<p>This will start a server that will be available for your test:</p>
+<pre><code>ain] 17:00:16,644 INFO [org.apache.activemq.artemis.core.server] AMQ221000: live Message Broker is starting with configuration Broker Configuration (clustered=false,journalDirectory=data/journal,bindingsDirectory=data/bindings,largeMessagesDirectory=data/largemessages,pagingDirectory=data/paging)
+[main] 17:00:16,666 INFO [org.apache.activemq.artemis.core.server] AMQ221045: libaio is not available, switching the configuration into NIO
+[main] 17:00:16,688 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-server]. Adding protocol support for: CORE
+[main] 17:00:16,801 INFO [org.apache.activemq.artemis.core.server] AMQ221007: Server is now live
+[main] 17:00:16,801 INFO [org.apache.activemq.artemis.core.server] AMQ221001: Apache ActiveMQ Artemis Message Broker version 1.5.0-SNAPSHOT [embedded-jms-server, nodeID=39e78380-842c-11e6-9e43-f45c8992f3c7]
+[main] 17:00:16,891 INFO [org.apache.activemq.artemis.core.server] AMQ221002: Apache ActiveMQ Artemis Message Broker version 1.5.0-SNAPSHOT [39e78380-842c-11e6-9e43-f45c8992f3c7] stopped, uptime 0.272 seconds
+</code></pre><h3 id="ordering-rules">Ordering rules</h3>
+<p>This is actually a Junit feature, but this could be helpful on pre-determining the order on which rules are executed. </p>
+<pre><code class="lang-java"> ActiveMQDynamicProducerResource producer = <span class="hljs-keyword">new</span> ActiveMQDynamicProducerResource(server.getVmURL());
+
+ <span class="hljs-meta">@Rule</span>
+ <span class="hljs-keyword">public</span> RuleChain ruleChain = RuleChain.outerRule(<span class="hljs-keyword">new</span> ThreadLeakCheckRule()).around(server).around(producer);
+</code></pre>
+<h3 id="available-rules">Available Rules</h3>
+<table>
+<thead>
+<tr>
+<th style="text-align:left">Name</th>
+<th style="text-align:left">Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td style="text-align:left">EmbeddedActiveMQResource</td>
+<td style="text-align:left">It will run a Server, without the JMS manager </td>
+</tr>
+<tr>
+<td style="text-align:left">EmbeddedJMSResource</td>
+<td style="text-align:left">It will run a Server, including the JMS Manager</td>
+</tr>
+<tr>
+<td style="text-align:left">ActiveMQConsumerResource</td>
+<td style="text-align:left">It will automate the creation of a consumer </td>
+</tr>
+<tr>
+<td style="text-align:left">ActiveMQProducerResource</td>
+<td style="text-align:left">It will automate the creation of a producer</td>
+</tr>
+<tr>
+<td style="text-align:left">ThreadLeakCheckRule</td>
+<td style="text-align:left">It will check that all threads have been finished after the test is finished</td>
+</tr>
+</tbody>
+</table>
+
+
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