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Posted to commits@qpid.apache.org by or...@apache.org on 2018/08/20 09:24:18 UTC
[14/21] qpid-site git commit: Update site for Qpid JMS AMQP 0-x
release 6.3.3
http://git-wip-us.apache.org/repos/asf/qpid-site/blob/02e60e87/content/releases/qpid-jms-amqp-0-x-6.3.3/jms-amqp-0-8-book/JMS-Client-0-8-Client-Understanding-Connection.html
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+ <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li><a href="/releases/index.html">Releases</a></li><li><a href="/releases/qpid-jms-amqp-0-x-6.3.3/index.html">Qpid JMS AMQP 0-x 6.3.3</a></li><li><a href="/releases/qpid-jms-amqp-0-x-6.3.3/jms-amqp-0-8-book/index.html">Apache Qpid JMS AMQP 0-8/0-9/0-9-1</a></li><li>5.3. Connection</li></ul>
+
+ <div id="-middle-content">
+ <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">5.3. Connection</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="JMS-Client-0-8-Client-Understanding-ConnectionFactory.html">Prev</a> </td><th align="center" width="60%">Chapter 5. Understanding the Client</th><td align="right" width="20%"> <a accesskey="n" href="JMS-Client-0-8-Client-Understanding-Session.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="JMS-Client-0-8-Client-Understanding-Connection"></a>5.3. Connection</h2></div></div></div><p>A Connection represents an open communication channel between application and
+ Broker.</p><p>Connections are created from the ConnectionFactory <a class="footnote" href="#ftn.d0e390" id="d0e390"><sup class="footnote">[4]</sup></a>.</p><p>Each connection utilises a single TCP/IP connection between the process of the application
+ and the process of the Broker. The act of establishing a connection is therefore a relatively
+ expensive operation. It is recommended that the same connection is used for a series of
+ message interactions. Patterns utilising a connection per message should not be used. </p><p>The underlying TCP/IP connection remains open for the lifetime of the JMS connection. It
+ is closed when the application calls <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/Connection.html#close()" target="_top">Connection#close()</a>, but it
+ can also be closed if the connection is closed from the Broker side (via a Management
+ operation or broker shutdown or running into conditions which AMQP specifications treats as
+ errors and mandates closing the connection). The JMS connection will also be closed if the
+ underlying TCP/IP connection is broken.</p><p>Qpid connections have failover and heartbeating capabilities. They support SSL and
+ client-auth. These are described in the sub-sections that follow.</p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="JMS-Client-0-8-Client-Understanding-Connection-Failover"></a>5.3.1. Failover</h3></div></div></div><p>Qpid connections support a failover feature. This is the ability to automatically
+ re-establish a failed connection, either to the same Broker, or the next Broker in the
+ broker list.</p><p>This failover process is done in a manner that is mostly transparent to the application.
+ After a successful failover, any existing Connection, Session, MessageConsumer and
+ MessageProducer objects held by the application remain valid.</p><p>If a failover occurs during the scope of a JMS Transaction, any work performed by that
+ transaction is lost. The application is made aware of this loss by way of the <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/TransactionRolledBackException.html" target="_top">TransactionRolledBackException</a> from the <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/Session.html#commit" target="_top">Session#commit()</a> call.
+ Applications utilising failover must be prepared to catch this exception and respond by
+ either repeating the work of the transaction, or by propagating a rollback to the
+ originating system.</p><p>If, after all retries are exhausted, failover has failed to reconnect the application,
+ the Connection's <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/ExceptionListener.html" target="_top">ExceptionListener</a> will receive a JMSException with a linked exception of <a class="link" href="JMS-Client-0-8-Appendix-Exceptions-AMQDisconnectedException" target="_top">AMQDisconnectedException</a>. Any further use of the JMS objects (Connection, Session
+ etc), will results in a <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/IllegalStateException.html" target="_top">IllegalStateException</a>.</p><p>Configure failover using the Connection URL. Here's an example Connection URL utilising
+ failover between two brokers. Note the use of the broker options <a class="link" href="JMS-Client-0-8-Connection-URL.html#JMS-Client-0-8-Connection-URL-BrokerOptions-Retries"><code class="literal">retries</code></a> and <a class="link" href="JMS-Client-0-8-Connection-URL.html#JMS-Client-0-8-Connection-URL-BrokerOptions-ConnectDelay"><code class="literal">connectdelay</code></a> to control the number of connection attempts to
+ each individual broker, and the delay between each connection attempt. Also note the use of
+ the <span class="emphasis"><em>failover option</em></span>
+ <code class="literal">cyclecount</code> to control the number of times the failover mechanism will
+ traverse the brokerlist.</p><div class="example"><a id="d0e445"></a><p class="title"><strong>Example 5.1. Connection URL configured for failover</strong></p><div class="example-contents"><pre class="screen">
+amqp://username:password@clientid/test
+ ?brokerlist='tcp://localhost:15672?retries='10'&connectdelay='1000';tcp://localhost:25672?retries='10'&connectdelay='1000''
+ &failover='roundrobin?cyclecount='20''
+ </pre></div></div><br class="example-break" /><p>For full details see <a class="xref" href="JMS-Client-0-8-Connection-URL.html" title="Chapter 7. Connection URLs">Chapter 7, <em>Connection URLs</em></a></p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>Note, that a single broker failover is enabled by default. If the failover behaviour
+ is not desired it can be switched off by setting a failover option to
+ <code class="literal">nofailover</code> as in the example below </p><div class="example"><a id="d0e459"></a><p class="title"><strong>Example 5.2. Connection URL configured with nofailover</strong></p><div class="example-contents"><pre class="screen">
+amqp://username:password@clientid/test
+ ?brokerlist='tcp://localhost:15672?failover='nofailover'
+ </pre></div></div><p><br class="example-break" />
+ </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="JMS-Client-0-8-Client-Understanding-Connection-Heartbeating"></a>5.3.2. Heartbeating</h3></div></div></div><p>Qpid connections support heartbeating. When enabled, the Client and Broker
+ exchange a heartbeat during periods of inactivity. This allows both peers to discover if the
+ TCP/IP connection becomes inoperable in a timely manner.</p><p>This feature is sometimes useful in applications that must traverse firewalls as the
+ heartbeat prevents connections from being closed during periods when there is no application
+ traffic.</p><p>It is also allows the both the JMS client and the Broker to confirm that the other is
+ <span class="emphasis"><em>minimally</em></span> responsive. (It does nothing however to determine the
+ health of the higher level tiers of application, for this reason, applications may implement
+ an application level heartbeat either in addition to, or instead of the heartbeat.</p><p>If the client ever fails to receive two consecutive heartbeats, the Connection will be
+ automatically closed and the Connection's <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/ExceptionListener.html" target="_top">ExceptionListener</a> will
+ receive a JMSException with a linked exception of AMQDisconnectedException. Any further use
+ of the JMS objects (Connection, Session etc), will results in a <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/IllegalStateException.html" target="_top">IllegalStateException</a>.</p><p>To enable heartbeating either use a Connection URL including the broker option <a class="link" href="JMS-Client-0-8-Connection-URL.html#JMS-Client-0-8-Connection-URL-BrokerOptions-Heartbeat"><code class="literal">heartbeat</code></a>, or use the system property <a class="link" href="JMS-Client-0-8-System-Properties.html#JMS-Client-0-8-System-Properties-Heartbeat"><code class="literal">qpid.heartbeat</code></a>. </p><div class="example"><a id="d0e495"></a><p class="title"><strong>Example 5.3. Connection URL configured for heartbeating</strong></p><div class="example-contents"><pre class="screen">
+amqp://guest:guest@clientid/?brokerlist='localhost:5672?heartbeat='5''
+ </pre></div></div><br class="example-break" /></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="JMS-Client-0-8-Client-Understanding-Connection-SSL"></a>5.3.3. SSL</h3></div></div></div><p>The Client supports connections encrypted using Secure Socket Layer (SSL) and
+ SSL-Client Authentication. SSL is configured using Connection URL. To use SSL, SSL must be
+ be configured on the Broker.</p><p>Some example Connection URLs using SSL follow:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>Simple SSL when the Broker is secured by a certificate that is signed by a CA which
+ is trusted by the JVM.</p><div class="example"><a id="d0e511"></a><p class="title"><strong>Example 5.4. Connection URL configured for SSL - CA trusted by JVM</strong></p><div class="example-contents"><pre class="screen">
+amqp://guest:guest@clientid/?brokerlist='localhost:5671'&ssl='true'
+ </pre></div></div><br class="example-break" /></li><li class="listitem"><p>SSL when the Broker is secured by a certificate that is signed by a CA which is NOT
+ trusted by the JVM (such as when a organisation is using a private CA, or self-signed
+ certificates are in use). For this case, we use <a class="link" href="JMS-Client-0-8-Connection-URL.html#JMS-Client-0-8-Connection-URL-BrokerOptions-TrustStore"><code class="literal">trust_store</code></a> and <a class="link" href="JMS-Client-0-8-Connection-URL.html#JMS-Client-0-8-Connection-URL-BrokerOptions-TrustStorePassword"><code class="literal">trust_store_password</code></a> to specify a path a truststore file
+ (containing the certificate of the private-CA) and the truststore password.</p><div class="example"><a id="d0e527"></a><p class="title"><strong>Example 5.5. Connection URL configured for SSL - CA not trusted by JVM</strong></p><div class="example-contents"><pre class="screen">
+amqp://guest:guest@clientid/?brokerlist='localhost:5671?trust_store='/path/to/acme_org_ca.ts'&trust_store_password='secret''&ssl='true'
+ </pre></div></div><br class="example-break" /></li><li class="listitem"><p>SSL with SSL client-auth. For this case, we use <a class="link" href="JMS-Client-0-8-Connection-URL.html#JMS-Client-0-8-Connection-URL-BrokerOptions-KeyStore"><code class="literal">key_store</code></a> and <a class="link" href="JMS-Client-0-8-Connection-URL.html#JMS-Client-0-8-Connection-URL-BrokerOptions-KeyStorePassword"><code class="literal">key_store_password</code></a> to specify a path a keystore file
+ (containing the certificate of the client) and the keystore password.</p><div class="example"><a id="d0e543"></a><p class="title"><strong>Example 5.6. Connection URL configured for SSL - SSL client-auth</strong></p><div class="example-contents"><pre class="screen">
+amqp://guest:guest@clientid/?brokerlist='localhost:5671?key_store='/path/to/app1_client_cert.ks'&key_store_password='secret''&ssl='true'
+ </pre></div></div><br class="example-break" /><p>Alternatively we can use <a class="link" href="JMS-Client-0-8-Connection-URL.html#JMS-Client-0-8-Connection-URL-BrokerOptions-ClientCertPath"><code class="literal">client_cert_path</code></a> and <a class="link" href="JMS-Client-0-8-Connection-URL.html#JMS-Client-0-8-Connection-URL-BrokerOptions-ClientCertPrivKeyPath"><code class="literal">client_cert_priv_key_ath</code></a> to specify a path to a certificate file (in PEM or DER format)
+ and the private key information (again in either PEM or DER format) respectively.</p><div class="example"><a id="d0e558"></a><p class="title"><strong>Example 5.7. Connection URL configured for SSL - SSL client-auth (2)</strong></p><div class="example-contents"><pre class="screen">
+amqp://guest:guest@clientid/?brokerlist='localhost:5671?client_cert_path='/path/to/app1_client.crt'&client_cert_priv_key_path='/path/to/app1_client.key''&ssl='true'
+ </pre></div></div><br class="example-break" /></li></ul></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="JMS-Client-0-8-Client-Understanding-Connection-MessageCompression"></a>5.3.4. Message Compression</h3></div></div></div><p>The client has the ability to transparently compress message payloads on outgoing
+ messages and decompress them on incoming messages. In some environments and with some
+ payloads this feature might offer performance improvements by reducing the number of bytes
+ transmitted over the connection.</p><p>In order to make use of message compression, the Broker must enable the feature too,
+ otherwise the compression options will be ignored.</p><p> To enable message compression on the client use the connection url property <a class="link" href="JMS-Client-0-8-Connection-URL.html#JMS-Client-0-8-Connection-URL-ConnectionOptions-CompressMessages"><code class="literal">compressMessages</code></a> (or JVM wide using the system property <a class="link" href="JMS-Client-0-8-System-Properties.html#JMS-Client-0-8-System-Properties-ConnectionCompressMessages"><code class="literal">qpid.connection_compress_messages</code></a>)</p><p>It is also possible to control the threshold at which the client will begin to compress
+ message payloads. See connection url property <a class="link" href="JMS-Client-0-8-Connection-URL.html#JMS-Client-0-8-Connection-URL-ConnectionOptions-MessageCompressionThresholdSize"><code class="literal">messageCompressionThresholdSize</code></a> (or JVM wide using the system
+ property <a class="link" href="JMS-Client-0-8-System-Properties.html#JMS-Client-0-8-System-Properties-MessageCompressionThresholdSize"><code class="literal">qpid.message_compression_threshold_size</code></a>)</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>The Broker, where necessary, takes care of compressing/decompressing messages of the
+ fly so that clients using message compression can exchange messages with clients not
+ supporting message compression transparently, without application intervention.</p></div></div><div class="footnotes"><br /><hr style="width:100; text-align:left;margin-left: 0" /><div class="footnote" id="ftn.d0e390"><p><a class="para" href="#d0e390"><sup class="para">[4] </sup></a>Constructors of the AMQConnection class must not be used.</p></div></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="JMS-Client-0-8-Client-Understanding-ConnectionFactory.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="JMS-Client-0-8-Client-Understanding.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="JMS-Client-0-8-Client-Understanding-Session.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">5.2. ConnectionFactory </td><td align="center" width="20%"><a accesskey="h" href="JMS-Client-Book.html">Home</a></td><td a
lign="right" valign="top" width="40%"> 5.4. Session</td></tr></table></div></div>
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+ <li><a href="/documentation.html">Documentation</a></li>
+ <li><a href="/download.html">Download</a></li>
+ <li><a href="/discussion.html">Discussion</a></li>
+ </ul>
+ </div>
+
+ <div id="-menu" class="panel" style="display: none;">
+ <div class="flex">
+ <section>
+ <h3>Project</h3>
+
+ <ul>
+ <li><a href="/overview.html">Overview</a></li>
+ <li><a href="/components/index.html">Components</a></li>
+ <li><a href="/releases/index.html">Releases</a></li>
+ </ul>
+ </section>
+
+ <section>
+ <h3>Messaging APIs</h3>
+
+ <ul>
+ <li><a href="/proton/index.html">Qpid Proton</a></li>
+ <li><a href="/components/jms/index.html">Qpid JMS</a></li>
+ <li><a href="/components/messaging-api/index.html">Qpid Messaging API</a></li>
+ </ul>
+ </section>
+
+ <section>
+ <h3>Servers and tools</h3>
+
+ <ul>
+ <li><a href="/components/broker-j/index.html">Broker-J</a></li>
+ <li><a href="/components/cpp-broker/index.html">C++ broker</a></li>
+ <li><a href="/components/dispatch-router/index.html">Dispatch router</a></li>
+ </ul>
+ </section>
+
+ <section>
+ <h3>Resources</h3>
+
+ <ul>
+ <li><a href="/dashboard.html">Dashboard</a></li>
+ <li><a href="https://cwiki.apache.org/confluence/display/qpid/Index">Wiki</a></li>
+ <li><a href="/resources.html">More resources</a></li>
+ </ul>
+ </section>
+ </div>
+ </div>
+
+ <div id="-search" class="panel" style="display: none;">
+ <form action="http://www.google.com/search" method="get">
+ <input type="hidden" name="sitesearch" value="qpid.apache.org"/>
+ <input type="text" name="q" maxlength="255" autofocus="autofocus" tabindex="1"/>
+ <button type="submit">Search</button>
+ <a href="/search.html">More ways to search</a>
+ </form>
+ </div>
+
+ <div id="-middle" class="panel">
+ <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li><a href="/releases/index.html">Releases</a></li><li><a href="/releases/qpid-jms-amqp-0-x-6.3.3/index.html">Qpid JMS AMQP 0-x 6.3.3</a></li><li><a href="/releases/qpid-jms-amqp-0-x-6.3.3/jms-amqp-0-8-book/index.html">Apache Qpid JMS AMQP 0-8/0-9/0-9-1</a></li><li>5.2. ConnectionFactory</li></ul>
+
+ <div id="-middle-content">
+ <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">5.2. ConnectionFactory</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="JMS-Client-0-8-Client-Understanding.html">Prev</a> </td><th align="center" width="60%">Chapter 5. Understanding the Client</th><td align="right" width="20%"> <a accesskey="n" href="JMS-Client-0-8-Client-Understanding-Connection.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="JMS-Client-0-8-Client-Understanding-ConnectionFactory"></a>5.2. ConnectionFactory</h2></div></div></div><p>A <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/ConnectionFactory.html" target="_top">ConnectionFactory</a>
+ allows an application to create a <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/Connection.html" target="_top">Connection</a>.</p><p>The application obtains the ConnectionFactory from an <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/naming/InitialContext.html" target="_top">InitialContext</a>. The
+ InitialContext is itself obtained from an InitialContextFactory. </p><p>The Client provides a single implementation of the InitialContextFactory in class
+ <code class="literal">org.apache.qpid.jndi.PropertiesFileInitialContextFactory</code>. This
+ implementation is backed by a <a class="link" href="http://docs.oracle.com/javaee/6/api/java/util/Properties.html" target="_top">Properties</a> object which can of course be loaded from an external properties file,
+ or created programatically.</p><p>The examples in the previous chapter illustrated the Java code required to <a class="link" href="JMS-Client-0-8-Examples.html#JMS-Client-0-8-Examples-PTP" title="4.1. Point to point example">create the InitialContext</a> and an <a class="link" href="JMS-Client-0-8-Examples.html#JMS-Client-0-8-Examples-PTP-PropertiesFile" title="Example 4.2. JMS Example - Point to Point Messaging - JNDI Properties">example properties file</a>.</p><p>The Client also provides an alternate connection factory implementation providing a
+ connection pool. This can be useful when utilsing frameworks such as Spring.
+ <a class="xref" href="JMS-Client-0-8-Appendix-PooledConnecytionFactory.html" title="Appendix D. PooledConnectionFactory">Appendix D, <em>PooledConnectionFactory</em></a>.</p><div class="figure"><a id="d0e375"></a><p class="title"><strong>Figure 5.2. JNDI overview</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="JNDI overview" src="images/JndiOverview.png" /></div></div></div><br class="figure-break" /><p>Note that the Apache Qpid Broker-J does not present a JNDI interface to the application.</p></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="JMS-Client-0-8-Client-Understanding.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="JMS-Client-0-8-Client-Understanding.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="JMS-Client-0-8-Client-Understanding-Connection.html">Next</a></td></tr><t
r><td align="left" valign="top" width="40%">Chapter 5. Understanding the Client </td><td align="center" width="20%"><a accesskey="h" href="JMS-Client-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 5.3. Connection</td></tr></table></div></div>
+
+ <hr/>
+
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+
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+ the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache
+ License, Version 2.0</a>; Apache Qpid, Qpid, Qpid Proton,
+ Proton, Apache, the Apache feather logo, and the Apache Qpid
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+ </p>
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+</html>
http://git-wip-us.apache.org/repos/asf/qpid-site/blob/02e60e87/content/releases/qpid-jms-amqp-0-x-6.3.3/jms-amqp-0-8-book/JMS-Client-0-8-Client-Understanding-Destinations.html
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@@ -0,0 +1,149 @@
+<!DOCTYPE html>
+<!--
+ -
+ - Licensed to the Apache Software Foundation (ASF) under one
+ - or more contributor license agreements. See the NOTICE file
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+ - "License"); you may not use this file except in compliance
+ - with the License. You may obtain a copy of the License at
+ -
+ - http://www.apache.org/licenses/LICENSE-2.0
+ -
+ - Unless required by applicable law or agreed to in writing,
+ - software distributed under the License is distributed on an
+ - "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ - KIND, either express or implied. See the License for the
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+ - under the License.
+ -
+-->
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
+ <head>
+ <title>5.7. Destinations - Apache Qpid™</title>
+ <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
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+https://github.com/apache/qpid-proton/blob/go1/README.md
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+ </ul>
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+
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+
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+ <li><a href="/components/index.html">Components</a></li>
+ <li><a href="/releases/index.html">Releases</a></li>
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+
+ <section>
+ <h3>Messaging APIs</h3>
+
+ <ul>
+ <li><a href="/proton/index.html">Qpid Proton</a></li>
+ <li><a href="/components/jms/index.html">Qpid JMS</a></li>
+ <li><a href="/components/messaging-api/index.html">Qpid Messaging API</a></li>
+ </ul>
+ </section>
+
+ <section>
+ <h3>Servers and tools</h3>
+
+ <ul>
+ <li><a href="/components/broker-j/index.html">Broker-J</a></li>
+ <li><a href="/components/cpp-broker/index.html">C++ broker</a></li>
+ <li><a href="/components/dispatch-router/index.html">Dispatch router</a></li>
+ </ul>
+ </section>
+
+ <section>
+ <h3>Resources</h3>
+
+ <ul>
+ <li><a href="/dashboard.html">Dashboard</a></li>
+ <li><a href="https://cwiki.apache.org/confluence/display/qpid/Index">Wiki</a></li>
+ <li><a href="/resources.html">More resources</a></li>
+ </ul>
+ </section>
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+
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+ <form action="http://www.google.com/search" method="get">
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+ </form>
+ </div>
+
+ <div id="-middle" class="panel">
+ <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li><a href="/releases/index.html">Releases</a></li><li><a href="/releases/qpid-jms-amqp-0-x-6.3.3/index.html">Qpid JMS AMQP 0-x 6.3.3</a></li><li><a href="/releases/qpid-jms-amqp-0-x-6.3.3/jms-amqp-0-8-book/index.html">Apache Qpid JMS AMQP 0-8/0-9/0-9-1</a></li><li>5.7. Destinations</li></ul>
+
+ <div id="-middle-content">
+ <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">5.7. Destinations</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="JMS-Client-0-8-Client-Understanding-MessageConsumer.html">Prev</a> </td><th align="center" width="60%">Chapter 5. Understanding the Client</th><td align="right" width="20%"> <a accesskey="n" href="JMS-Client-0-8-JNDI-Properties-Format.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="JMS-Client-0-8-Client-Understanding-Destinations"></a>5.7. Destinations</h2></div></div></div><p>A Destination is either a Queue or Topic. In the Client a Destination
+ encapsulates a Binding URL. In simple terms, the Binding URL comprises of an exchange, queue
+ and a routing key. Binding URLs are described fully by <a class="xref" href="JMS-Client-0-8-Binding-URL.html" title="Chapter 8. Binding URL">Chapter 8, <em>Binding URL</em></a>. </p><p>In many cases, applications do not need to deal directly with Binding URLs, instead they
+ can refer to JMS administered objects declared in the JNDI properties file with the
+ <code class="literal">queue.</code> and <code class="literal">topic.</code> prefix to create Queues and Topics
+ objects respectively. </p></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="JMS-Client-0-8-Client-Understanding-MessageConsumer.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="JMS-Client-0-8-Client-Understanding.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="JMS-Client-0-8-JNDI-Properties-Format.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">5.6. MessageConsumer </td><td align="center" width="20%"><a accesskey="h" href="JMS-Client-Book.html">Home</a></td><td align="right" valign="top" width="40%"> Chapter 6. JNDI Properties Format</td></tr></table></div></div>
+
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+ The Apache Software Foundation; Licensed under
+ the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache
+ License, Version 2.0</a>; Apache Qpid, Qpid, Qpid Proton,
+ Proton, Apache, the Apache feather logo, and the Apache Qpid
+ project logo are trademarks of The Apache Software
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+</html>
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@@ -0,0 +1,171 @@
+<!DOCTYPE html>
+<!--
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+ - Licensed to the Apache Software Foundation (ASF) under one
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+ - "License"); you may not use this file except in compliance
+ - with the License. You may obtain a copy of the License at
+ -
+ - http://www.apache.org/licenses/LICENSE-2.0
+ -
+ - Unless required by applicable law or agreed to in writing,
+ - software distributed under the License is distributed on an
+ - "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ - KIND, either express or implied. See the License for the
+ - specific language governing permissions and limitations
+ - under the License.
+ -
+-->
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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+ <title>5.6. MessageConsumer - Apache Qpid™</title>
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+ <a id="-menu-link"><img width="16" height="16" src="" alt="Menu"/></a>
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+ <li><a href="/discussion.html">Discussion</a></li>
+ </ul>
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+
+ <div id="-menu" class="panel" style="display: none;">
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+ <section>
+ <h3>Project</h3>
+
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+ <li><a href="/components/index.html">Components</a></li>
+ <li><a href="/releases/index.html">Releases</a></li>
+ </ul>
+ </section>
+
+ <section>
+ <h3>Messaging APIs</h3>
+
+ <ul>
+ <li><a href="/proton/index.html">Qpid Proton</a></li>
+ <li><a href="/components/jms/index.html">Qpid JMS</a></li>
+ <li><a href="/components/messaging-api/index.html">Qpid Messaging API</a></li>
+ </ul>
+ </section>
+
+ <section>
+ <h3>Servers and tools</h3>
+
+ <ul>
+ <li><a href="/components/broker-j/index.html">Broker-J</a></li>
+ <li><a href="/components/cpp-broker/index.html">C++ broker</a></li>
+ <li><a href="/components/dispatch-router/index.html">Dispatch router</a></li>
+ </ul>
+ </section>
+
+ <section>
+ <h3>Resources</h3>
+
+ <ul>
+ <li><a href="/dashboard.html">Dashboard</a></li>
+ <li><a href="https://cwiki.apache.org/confluence/display/qpid/Index">Wiki</a></li>
+ <li><a href="/resources.html">More resources</a></li>
+ </ul>
+ </section>
+ </div>
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+
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+ <input type="hidden" name="sitesearch" value="qpid.apache.org"/>
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+ <button type="submit">Search</button>
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+
+ <div id="-middle" class="panel">
+ <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li><a href="/releases/index.html">Releases</a></li><li><a href="/releases/qpid-jms-amqp-0-x-6.3.3/index.html">Qpid JMS AMQP 0-x 6.3.3</a></li><li><a href="/releases/qpid-jms-amqp-0-x-6.3.3/jms-amqp-0-8-book/index.html">Apache Qpid JMS AMQP 0-8/0-9/0-9-1</a></li><li>5.6. MessageConsumer</li></ul>
+
+ <div id="-middle-content">
+ <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">5.6. MessageConsumer</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="JMS-Client-0-8-Client-Understanding-MessageProducer.html">Prev</a> </td><th align="center" width="60%">Chapter 5. Understanding the Client</th><td align="right" width="20%"> <a accesskey="n" href="JMS-Client-0-8-Client-Understanding-Destinations.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="JMS-Client-0-8-Client-Understanding-MessageConsumer"></a>5.6. MessageConsumer</h2></div></div></div><p>A MessageConsumer receives messages from a Queue or Topic.</p><p>MessageConsumer objects are created from the Session.</p><p>Qpid JMS MessageConsumers have a number of features above that required by JMS. These are
+ described in the sub-sections that follow.</p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="JMS-Client-0-8-Client-Understanding-MessageConsumer-ConsumerSideEffect"></a>5.6.1. Consumers have Exchange/Queue Declaration and Binding Side Effect</h3></div></div></div><p>By default, calling <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/Session.html#createConsumer(javax.jms.Destination)" target="_top">Session#createConsumer()</a> will cause:</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>If the exchange does not exist on the Broker, it will be created. The exchange is
+ specified by the Binding URL associated with the Destination.</p></li><li class="listitem"><p>If the queue does not exist on the Broker, it will be created. The queue is
+ specified by the Binding URL associated with the Destination.</p></li><li class="listitem"><p>If there is no binding between the exchange and queue, a binding will be created
+ using the routingkey as a bindingkey. The exchange, queue and routing key are specified
+ by the Binding URL associated with the Destination.</p></li></ol></div><p>The exchange declare, queue declare and bind side effects can be suppressed using system
+ properties <a class="link" href="JMS-Client-0-8-System-Properties.html#JMS-Client-0-8-System-Properties-DeclareExchanges"><code class="literal">qpid.declare_exchanges</code></a>, <a class="link" href="JMS-Client-0-8-System-Properties.html#JMS-Client-0-8-System-Properties-DeclareQueues"><code class="literal">qpid.declare_queues</code></a> and <a class="link" href="JMS-Client-0-8-System-Properties.html#JMS-Client-0-8-System-Properties-BindQueues"><code class="literal">qpid.bind_queues</code></a>.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="JMS-Client-0-8-Client-Understanding-MessageConsumer-TopicSubscriptions"></a>5.6.2. Topic Subscriptions</h3></div></div></div><p>The Client implements each subscription to a Topic as separate queue on the
+ Broker. From the perspective of the JMS application this implementational detail is
+ irrelevant: the application never needs to directly address these queues. However, these
+ details are important when considering Management and Operational concerns.</p><p>Durable topic subscriptions use a <span class="emphasis"><em>durable</em></span> and
+ <span class="emphasis"><em>exclusive</em></span> queue named as follows:</p><pre class="programlisting">
+ clientid: + subscriptionId
+ </pre><p>where <code class="literal">subscriptionId</code> is that passed to the <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/Session.html#createDurableSubscriber(javax.jms.Topic,%20java.lang.String)" target="_top">Session#createDurableSubscriber(javax.jms.Topic,java.lang.String)</a></p><p>Calling <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/Session.html#unsubscribe(java.lang.String)" target="_top">Session#unsubscribe(java.lang.String)</a> deletes the underlying queue.</p><p>Non-durable topic subscriptions use a <span class="emphasis"><em>non-durable</em></span>,
+ <span class="emphasis"><em>exclusive</em></span> and <span class="emphasis"><em>auto-delete</em></span> queue named as
+ follows:</p><pre class="programlisting">
+ tmp + _ + ip + _ + port + _ + sequence
+ </pre><p>where <code class="literal">ip</code> is the ip address of the client with dots replaced by
+ underscores, <code class="literal">port</code> is the ephemeral port number assigned to the client's
+ connection, and <code class="literal">sequence</code> is a sequence number.</p><p>Closing the consumer (or closing the connection) will delete the underlying
+ queue.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="JMS-Client-0-8-Client-Understanding-MessageConsumer-MaximumDeliveryCount"></a>5.6.3. Maximum Delivery Count</h3></div></div></div><p>With this feature, the Broker keeps track of a number of times a message has been
+ delivered to a consumer. If the count ever exceeds a threshold value, the Broker moves the
+ message to a dead letter queue (DLQ). This is used to prevent poison messages preventing a
+ system's operation. This client feature requires support for the corresponding feature by
+ the Broker.</p><p>When using this feature, the application must either set system property <a class="link" href="JMS-Client-0-8-System-Properties.html#JMS-Client-0-8-System-Properties-RejectBehaviour">qpid.reject.behaviour</a> or
+ the Binding URL option <a class="link" href="JMS-Client-0-8-Binding-URL.html#JMS-Client-0-8-Binding-URL-Options-RejectBehaviour"><code class="literal">rejectbehaviour</code></a> to the value
+ <code class="literal">server</code>.</p><p>See <a class="link" href="../../java-broker/book/Java-Broker-Runtime-Handling-Undeliverable-Messages.html#Java-Broker-Runtime-Handling-Undeliverable-Messages-Maximum-Delivery-Count" target="_top"> Handling Undeliverable Messages</a> within the Apache Qpid Broker-J book for full details of
+ the functioning of this feature.</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>The optional JMS message header <code class="literal">JMSXDeliveryCount</code> is
+ <span class="emphasis"><em>not</em></span> supported.</p></div></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="JMS-Client-0-8-Client-Understanding-MessageProducer.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="JMS-Client-0-8-Client-Understanding.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="JMS-Client-0-8-Client-Understanding-Destinations.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">5.5. MessageProducer </td><td align="center" width="20%"><a accesskey="h" href="JMS-Client-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 5.7. Destinations</td></tr></table></div></div>
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+
+ <div id="-middle-content">
+ <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">5.5. MessageProducer</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="JMS-Client-0-8-Client-Understanding-Session.html">Prev</a> </td><th align="center" width="60%">Chapter 5. Understanding the Client</th><td align="right" width="20%"> <a accesskey="n" href="JMS-Client-0-8-Client-Understanding-MessageConsumer.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="JMS-Client-0-8-Client-Understanding-MessageProducer"></a>5.5. MessageProducer</h2></div></div></div><p>A MessageProducer sends a message an <span class="emphasis"><em>Exchange</em></span>. It is the Exchange
+ (within the Broker) that routes the message to zero or more queue(s). Routing is performed
+ according to rules expressed as <span class="emphasis"><em>bindings</em></span> between the exchange and queues
+ and a <span class="emphasis"><em>routing key</em></span> included with each message.</p><p>To understand how this mechanism is used to deliver messages to queues and topics, see
+ <a class="link" href="../../java-broker/book/Java-Broker-Concepts-Exchanges.html" target="_top">Exchanges</a>
+ within the Apache Qpid Broker-J book.</p><p>It is important to understand that when synchronous publish is not exlicitly enabled,
+ <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/MessageProducer.html#send(javax.jms.Message)" target="_top">MessageProducer#send()</a> is <span class="emphasis"><em>asynchronous</em></span> in nature. When #send()
+ returns to the application, the application cannot be certain if the Broker has received the
+ message. The Client may not have yet started to send the message, the message could
+ residing in a TCP/IP buffer, or the messages could be in some intermediate buffer within the
+ Broker. If the application requires certainty the message has been received by the Broker, a
+ <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/Session.html#SESSION_TRANSACTED" target="_top">transactional
+ session</a>
+ <span class="emphasis"><em>must</em></span> be used, or synchronous publishing must be enabled using either the
+ <a class="link" href="JMS-Client-0-8-System-Properties.html#JMS-Client-0-8-System-Properties-SyncPublish">system property</a> or the
+ <a class="link" href="JMS-Client-0-8-Connection-URL.html#JMS-Client-0-8-Connection-URL-ConnectionOptions-SyncPublish">connection URL
+ option</a>.</p><p>Qpid JMS MessageProducers have a number of features above that required by JMS. These are
+ described in the sub-sections that follow.</p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="JMS-Client-0-8-Client-Understanding-MessageProducer-MandatoryMessage"></a>5.5.1. Mandatory Messages</h3></div></div></div><p>With this feature, publishing a message with a routing key for which no binding exists
+ on the exchange will result in the message being returned to the publisher's
+ connection.</p><p>The Message is returned to the application in an asynchronous fashion via the
+ Connection's <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/ExceptionListener.html" target="_top">ExceptionListener</a>. When a message is returned, it will be invoked with a
+ JMSException whose linked exception is an <a class="link" href="JMS-Client-0-8-Appendix-Exceptions-AMQNoRouteException" target="_top">AMQNoRouteException</a>.
+ The returned message is available to the application by calling
+ AMQNoRouteException#getUndeliveredMessage(). The ExceptionListener will be invoked exactly
+ once for each returned message.</p><p>If synchronous publishing has been enabled, and a mandatory message is returned, the
+ <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/MessageProducer.html#send(javax.jms.Message)" target="_top">MessageProducer#send()</a> method will throw a JMSException.
+ </p><p>The mandatory message feature is turned <span class="emphasis"><em>on</em></span> by default for Queue
+ destinations and <span class="emphasis"><em>off</em></span> for Topic destinations. This can be overridden
+ using system properties <a class="link" href="JMS-Client-0-8-System-Properties.html#JMS-Client-0-8-System-Properties-DefaultMandatory"><code class="literal">qpid.default_mandatory</code></a> and <a class="link" href="JMS-Client-0-8-System-Properties.html#JMS-Client-0-8-System-Properties-DefaultMandatoryTopic"><code class="literal">qpid.default_mandatory_topic</code></a> for Queues and Topics
+ respectively.</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>If this the mandatory flag is not set, the Broker will treat <a class="link" href="../../java-broker/book/Java-Broker-Concepts-Exchanges.html#Java-Broker-Concepts-Exchanges-UnroutableMessage" target="_top">the messages as unroutable</a>.</p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="JMS-Client-0-8-Client-Understanding-MessageProducer-CloseWhenNoRoute"></a>5.5.2. Close When No Route</h3></div></div></div><p>With this feature, if a mandatory message is published with a routing key for which no
+ binding exists on the exchange the Broker will close the connection. This client feature
+ requires support for the corresponding feature by the Broker.</p><p>To enable or disable from the client, use the Connection URL option <a class="link" href="JMS-Client-0-8-Connection-URL.html#JMS-Client-0-8-Connection-URL-ConnectionOptions-CloseWhenNoRoute"><code class="literal">closeWhenNoRoute</code></a>.</p><p>See <a class="link" href="../../java-broker/book/Java-Broker-Runtime-Close-Connection-When-No-Route.html" target="_top">
+ Closing client connections on unroutable mandatory messages</a> within the Apache Qpid Broker-J
+ book for full details of the functioning of this feature.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="JMS-Client-0-8-Client-Understanding-MessageProducer-ImmediateMessage"></a>5.5.3. Immediate Messages</h3></div></div></div><p>This feature is defined in <a class="link" href="http://www.amqp.org" target="_top">AMQP specifications</a>.</p><p>When this feature is enabled, when publishing a message the Broker ensures that a
+ Consumer is attached to queue. If there is no Consumer attached to the queue, the message is
+ returned to the publisher's connection. The Message is returned to the application in an
+ asynchronous fashion using the Connection's <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/ExceptionListener.html" target="_top">ExceptionListener</a>.</p><p>The ExceptionListener will be invoked with a JMSException whose linked exception is an
+ <a class="link" href="JMS-Client-0-8-Appendix-Exceptions-AMQNoConsumersException" target="_top">AMQNoConsumersException</a>. The returned message is available to the application by
+ calling AMQNoConsumersException#getUndeliveredMessage(). The ExceptionListener will be
+ invoked exactly once for each returned message.</p><p>If synchronous publishing has been enabled, and an immediate message is returned, the
+ <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/MessageProducer.html#send(javax.jms.Message)" target="_top">MessageProducer#send()</a> method will throw a JMSException.
+ </p><p>The immediate message feature is turned <span class="emphasis"><em>off</em></span> by default. It can be
+ enabled with system property <a class="link" href="JMS-Client-0-8-System-Properties.html#JMS-Client-0-8-System-Properties-DefaultImmediate"><code class="literal">qpid.default_immediate</code></a>.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="JMS-Client-0-8-Client-Understanding-MessageProducer-FlowControl"></a>5.5.4. Flow Control</h3></div></div></div><p>With this feature, if a message is sent to a queue that is overflow, the producer's
+ session is blocked until the queue becomes underfull, or a timeout expires. This client
+ feature requires support for the corresponding feature by the Broker.</p><p>To control the timeout use System property <a class="link" href="JMS-Client-0-8-System-Properties.html#JMS-Client-0-8-System-Properties-FlowControlWaitFailure"><code class="literal">qpid.flow_control_wait_failure</code></a>. To control the frequency with
+ which warnings are logged whilst a Session is blocked, use System property <a class="link" href="JMS-Client-0-8-System-Properties.html#JMS-Client-0-8-System-Properties-FlowControlWaitNotifyPeriod"><code class="literal">qpid.flow_control_wait_notify_period</code></a></p><p>See <a class="link" href="../../java-broker/book/Java-Broker-Runtime-Disk-Space-Management.html#Qpid-Producer-Flow-Control" target="_top"> Producer Flow Control</a> within the Apache Qpid Broker-Java book for full details of the
+ functioning of this feature.</p></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="JMS-Client-0-8-Client-Understanding-Session.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="JMS-Client-0-8-Client-Understanding.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="JMS-Client-0-8-Client-Understanding-MessageConsumer.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">5.4. Session </td><td align="center" width="20%"><a accesskey="h" href="JMS-Client-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 5.6. MessageConsumer</td></tr></table></div></div>
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