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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="ulink" 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 coditions 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="ulink" href="http://docs.oracle.com/javaee/6/api/javax/jms/TransactionRolledBackException.html"; target="_top">TransactionRolledBackException</a> from the <a class="ulink" 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="ulink" 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="ulink" 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="ulink" 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="idp6724096"></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 <span class="emphasis"><em>nofailover</em></span> as in the example below + </p><div class="example"><a id="idp4486608"></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 Qpid JMS 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="ulink" 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="ulink" 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="idp4497360"></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 Qpid JMS 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" 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="idp6212000"></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="idp6217040"></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="idp6222048"></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?trust_store='/path/to/app1_client_cert.ks'&key_store_password='secret''&ssl='true' + </pre></div></div><br class="example-break" /></li></ul></div></div><div class="footnotes"><br /><hr align="left" width="100" /><div class="footnote" id="ftn.idp4200688"><p><a class="para" href="#idp4200688"><sup class="para">[3] </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="index.html">Home</a></td><td align="right" valign="top" width="40%"> 5.4. 0;Session</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</a></li> + <li><a href="http://www.apache.org/foundation/sponsorship.html";>Sponsorship</a></li> + <li><a href="http://www.apache.org/foundation/thanks.html";>Thanks!</a></li> + <li><a href="http://www.apache.org/security/";>Security</a></li> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="data:image/png;base64," alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2013 + 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 + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </body> +</html>
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The + InitialContext is itself obtained from an InitialContextFactory. </p><p>The Qpid JMS 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="ulink" href="http://docs.oracle.com/javase/6/docs/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>Note that the Qpid Broker does not present a JNDI interface to the application.</p><div class="figure"><a id="idp3759408"></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" /></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><tr><td align="left" valign="top" width="40%">Chapter 5. Understanding the Qpid JMS client </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> 5.3. Connection</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</a></li> + <li><a href="http://www.apache.org/foundation/sponsorship.html";>Sponsorship</a></li> + <li><a href="http://www.apache.org/foundation/thanks.html";>Thanks!</a></li> + <li><a href="http://www.apache.org/security/";>Security</a></li> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="data:image/png;base64," alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2013 + 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 + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </body> +</html> http://git-wip-us.apache.org/repos/asf/qpid-site/blob/a1891eca/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-Destinations.html ---------------------------------------------------------------------- diff --git a/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-Destinations.html b/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-Destinations.html new file mode 100644 index 0000000..d92a3c8 --- /dev/null +++ b/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-Destinations.html @@ -0,0 +1,141 @@ +<!DOCTYPE html> +<!-- + - + - Licensed to the Apache Software Foundation (ASF) under one + - or more contributor license agreements. 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In the Qpid JMS 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="index.html">Home</a></td><td align="right" valign="top" width="40%"> Chapter 6. JNDI Properties Format</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</a></li> + <li><a href="http://www.apache.org/foundation/sponsorship.html";>Sponsorship</a></li> + <li><a href="http://www.apache.org/foundation/thanks.html";>Thanks!</a></li> + <li><a href="http://www.apache.org/security/";>Security</a></li> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="data:image/png;base64," alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2013 + 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 + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </body> +</html> http://git-wip-us.apache.org/repos/asf/qpid-site/blob/a1891eca/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-MessageConsumer.html ---------------------------------------------------------------------- diff --git a/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-MessageConsumer.html b/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-MessageConsumer.html new file mode 100644 index 0000000..ae11118 --- /dev/null +++ b/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-MessageConsumer.html @@ -0,0 +1,163 @@ +<!DOCTYPE html> +<!-- + - + - Licensed to the Apache Software Foundation (ASF) under one + - or more contributor license agreements. 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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="ulink" 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 and queue declare side effect 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> and <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>.</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 Qpid JMS 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="ulink" 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="ulink" 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="ulink" href="/releases/qpid-0.26/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 Java Broker 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="index.html">Home</a></td><td align="right" valign="top" width="40%"> 5.7. Destinations</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</a></li> + <li><a href="http://www.apache.org/foundation/sponsorship.html";>Sponsorship</a></li> + <li><a href="http://www.apache.org/foundation/thanks.html";>Thanks!</a></li> + <li><a href="http://www.apache.org/security/";>Security</a></li> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="data:image/png;base64," alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2013 + 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 + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </body> +</html> http://git-wip-us.apache.org/repos/asf/qpid-site/blob/a1891eca/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-MessageProducer.html ---------------------------------------------------------------------- diff --git a/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-MessageProducer.html b/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-MessageProducer.html new file mode 100644 index 0000000..05f37a3 --- /dev/null +++ b/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-MessageProducer.html @@ -0,0 +1,177 @@ +<!DOCTYPE html> +<!-- + - + - Licensed to the Apache Software Foundation (ASF) under one + - or more contributor license agreements. 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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="ulink" href="/releases/qpid-0.26/java-broker/book/Java-Broker-Concepts-Exchanges.html" target="_top">Exchanges</a> + within the Java Broker book.</p><p>It is important to understand that when not used on a transactional session, <a class="ulink" 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 Qpid JMS 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="ulink" 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.</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="ulink" 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="ulink" 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>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>Please note, according to AMQP specifications the mandatory flag on a message tells the server + how to react if the message cannot be routed to a queue. If this flag is set, the server will return an unroutable message with a + Return method. If this flag is zero, the server silently drops the message. Please, refer <a class="ulink" href="http://www.amqp.org"; target="_top">AMQP specifications</a> + for more details.</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="ulink" href="/releases/qpid-0.26/java-broker/book/Java-Broker-Close-Connection-When-No-Route.html" target="_top"> + Closing client connections on unroutable mandatory messages</a> within the Java Broker + 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="ulink" 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="ulink" 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="ulink" 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>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="ulink" href="/releases/qpid-0.26/java-broker/book/Java-Broker-Runtime-Disk-Space-Management.html#Qpid-Producer-Flow-Control" target="_top"> Producer Flow Control</a> within the Java Broker 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="index.html">Home</a></td><td align="right" valign="top" width="40%"> 5.6. MessageConsumer</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</a></li> + <li><a href="http://www.apache.org/foundation/sponsorship.html";>Sponsorship</a></li> + <li><a href="http://www.apache.org/foundation/thanks.html";>Thanks!</a></li> + <li><a href="http://www.apache.org/security/";>Security</a></li> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="data:image/png;base64," alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2013 + 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 + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </body> +</html> http://git-wip-us.apache.org/repos/asf/qpid-site/blob/a1891eca/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-Session.html ---------------------------------------------------------------------- diff --git a/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-Session.html b/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-Session.html new file mode 100644 index 0000000..706f243 --- /dev/null +++ b/content/releases/qpid-0.26/jms-client-0-8/book/JMS-Client-0-8-Client-Understanding-Session.html @@ -0,0 +1,187 @@ +<!DOCTYPE html> +<!-- + - + - Licensed to the Apache Software Foundation (ASF) under one + - or more contributor license agreements. 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Whilst Session objects are relatively + lightweight, patterns utilising a single Session per message are not recommended.</p><p>The number of sessions open per connection at any one time is limited. This value is + negotiated when the connection is made. It defaults to 256.</p><p>Qpid JMS Sessions have the ability to prefetch messages to improve consumer performance. + This feature is described next.</p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="JMS-Client-0-8-Client-Understanding-Session-Prefecth"></a>5.4.1. Prefetch</h3></div></div></div><p>Prefetch specifies how many messages the client will optimistically cache for delivery + to a consumer. This is a useful parameter to tune that can improve the throughput of an + application. The prefetch buffer is scoped per <span class="emphasis"><em>Session</em></span>.</p><p>The size of the prefetch buffer can be tuned per Connection using the connection url + option <a class="link" href="JMS-Client-0-8-Connection-URL.html#JMS-Client-0-8-Connection-URL-ConnectionOptions-Maxprefetch"><code class="literal">maxprefetch</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-Maxprefetch"><code class="literal">max_prefetch</code></a>). By default, prefetch defaults to 500.</p><p>There are situations when you may wish to consider reducing the size of prefetch:</p><p> + </p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>When using a <a class="ulink" href="http://www.eaipatterns.com/CompetingConsumers.html"; target="_top">Competing Consumers</a> pattern, prefetch can give the appearance of unequal + division of work. This will be apparent on startup when the queue has messages. The + first consumer started will cache prefetch size number of messages, possibly leaving + the other consumers with no initial work.</p></li><li class="listitem"><p>When using special queue types (such as LVQs, Sorted Queue and Priority Queues). + For these queue types the special delivery rules apply whilst the message resides on + the Broker. As soon as the message is sent to the client it delivery order is then + fixed. For example, if using a priority queue, and a prefetch of 100, and 100 messages + arrive with priority 2, the broker will send these to the client. If then a new + message arrives with priority 1, the broker cannot leap frog messages of the lower + priority. The priority 1 message will be delivered at the front of the next + batch.</p></li><li class="listitem"><p>When message size is large and you do not wish the memory footprint of the + application to grow (or suffer an OutOfMemoryError).</p></li></ol></div><p> + </p><p>Finally, if using multiple MessageConsumers on a single Session, keep in mind that + unless you keep polling <span class="emphasis"><em>all</em></span> consumers, it is possible for some traffic + patterns to result in consumer starvation and an application level deadlock. For example, if + prefetch is 100, and 100 hundred messages arrive suitable for consumer A, those messages + will be prefetched by the session, entirely filling the prefetch buffer. Now if the + application performs a blocking <a class="ulink" href="http://docs.oracle.com/javaee/6/api/javax/jms/MessageConsumer.html#receive()" target="_top">MessageConsumer#receive()</a> for Consumer B on the same Session, the application + will hang indefinitely as even if messages suitable for B arrive at the Broker. Those + messages can never be sent to the Session as no space is available in prefetch. </p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>Please note, when the acknowlegement mode <span class="emphasis"><em>Session#SESSION_TRANSACTED</em></span> + or <span class="emphasis"><em>Session#CLIENT_ACKNOWLEDGE</em></span> is set on a consuming session, + the prefetched messages are released from the prefetch buffer on transaction commit/rollback + (in case of acknowledgement mode <span class="emphasis"><em>Session#SESSION_TRANSACTED</em></span> ) + or acknowledgement of the messages receipt (in case of acknowledgement mode + <span class="emphasis"><em>Session#CLIENT_ACKNOWLEDGE</em></span> ). If the consuming application does not commit/rollback + the receiving transaction (for example, due to mistakes in application exception handling logic), + the prefetched messages continue to remain in the prefetch buffer preventing the delivery of the following messages. + As result, the application might stop the receiving of the messages + until the transaction is committed/rolled back (for <span class="emphasis"><em>Session#SESSION_TRANSACTED</em></span> ) + or received messages are acknowledged (for <span class="emphasis"><em>Session#CLIENT_ACKNOWLEDGE</em></span>).</p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="JMS-Client-0-8-Client-Understanding-Session-TemporaryQueues"></a>5.4.2. TemporaryQueues</h3></div></div></div><p>Qpid implements JMS temporary queues as AMQP auto-delete queues. The life cycle of these + queues deviates from the JMS specification.</p><p>AMQP auto-delete queues are deleted either when the <span class="emphasis"><em>last</em></span> Consumer + closes, or the Connection is closed. If no Consumer is ever attached to the queue, the queue + will remain until the Connection is closed.</p><p>This deviation has no practical impact on the implementation of the <a class="ulink" href="http://www.eaipatterns.com/RequestReply.html"; target="_top">request/reply messaging pattern</a> + utilising a per-request temporary reply queue. The reply to queue is deleted as the + application closes the Consumer awaiting the response. </p><p>Temporary queues are exposed to Management in the same way as normal queues. Temporary + queue names take the form string <code class="literal">TempQueue</code> followed by a random + UUID.</p><p>Note that <a class="ulink" href="http://docs.oracle.com/javaee/6/api/javax/jms/TemporaryQueue.html#delete()" target="_top">TemporaryQueue#delete()</a> merely marks the queue as deleted on within the JMS + client (and prevents further use of the queue from the application), however, the Queue will + remain on the Broker until the Consumer (or Connection) is closed.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="JMS-Client-0-8-Client-Understanding-Session-CreateQueue"></a>5.4.3. CreateQueue</h3></div></div></div><p>In the Qpid JMS client, <a class="ulink" href="http://docs.oracle.com/javaee/6/api/javax/jms/Session.html#createQueue(java.lang.String)" target="_top">Session#createQueue()</a> accepts either a queue name, or a Binding URL. If only name + is specified the destination will be resolved into binding URL: + direct://amq.direct//<queue name>?routingkey=’<queue name>’&durable=’true’. </p><p>Calling Session#createQueue() has no effect on the Broker.</p><p>Reiterating the advice from the JMS javadoc, it is suggested that this method is not + generally used. Instead, application should lookup Destinations declared within JNDI.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="JMS-Client-0-8-Client-Understanding-Session-CreateTopic"></a>5.4.4. CreateTopic</h3></div></div></div><p>In the Qpid JMS client, <a class="ulink" href="http://docs.oracle.com/javaee/6/api/javax/jms/Session.html#createTopic(java.lang.String)" target="_top">Session#createTopic()</a> accepts either a topic name, or a Binding URL. If only name + is specified the destination will be resolved into binding URL: topic://amq.topic//<topic + name>?routingkey=’<topic name>’.</p><p>Calling Session#createTopic() has no effect on the Broker.</p><p>Reiterating the advice from the JMS javadoc, it is suggested that this method is not + generally used. Instead, application should lookup Destinations declared within JNDI.</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-Connection.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-MessageProducer.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">5.3. Connection </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> 5.5. MessageProducer</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</a></li> + <li><a href="http://www.apache.org/foundation/sponsorship.html";>Sponsorship</a></li> + <li><a href="http://www.apache.org/foundation/thanks.html";>Thanks!</a></li> + <li><a href="http://www.apache.org/security/";>Security</a></li> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="data:image/png;base64," alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2013 + 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 + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </body> +</html> --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
