Modified: qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Broker.html URL: http://svn.apache.org/viewvc/qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Broker.html?rev=1722689&r1=1722688&r2=1722689&view=diff ============================================================================== --- qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Broker.html (original) +++ qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Broker.html Sat Jan 2 23:59:48 2016 @@ -114,7 +114,7 @@ https://github.com/apache/qpid-proton/bl <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-java-trunk/index.html">Qpid Java Trunk</a></li><li><a href="/releases/qpid-java-trunk/java-broker/book/index.html">AMQP Messaging Broker (Java)</a></li><li>4.2. Broker</li></ul> <div id="-middle-content"> - <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">4.2. Broker</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Concepts.html">Prev</a> </td><th align="center" width="60%">Chapter 4. Concepts</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Concepts-Virtualhost-Nodes.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="Java-Broker-Concepts-Broker"></a>4.2. Broker</h2></div></div></div><p>The <span class="emphasis"><em>Broker</em></span> is the outermost entity within the system.</p><p>The Broker is backed by storage. This storage is used to record the durable entities that exist beneath it.</p></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Concepts.h tml">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Concepts.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Concepts-Virtualhost-Nodes.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">Chapter 4. Concepts </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> 4.3. Virtualhost Nodes</td></tr></table></div></div> + <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">4.2. Broker</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Concepts.html">Prev</a> </td><th align="center" width="60%">Chapter 4. Concepts</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Concepts-Virtualhost-Nodes.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Java-Broker-Concepts-Broker"></a>4.2. Broker</h2></div></div></div><p>The <span class="emphasis"><em>Broker</em></span> is the outermost entity within the system.</p><p>The Broker is backed by storage. This storage is used to record the durable entities that exist beneath it.</p></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Ja va-Broker-Concepts.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Concepts.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Concepts-Virtualhost-Nodes.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">Chapter 4. Concepts </td><td align="center" width="20%"><a accesskey="h" href="AMQP-Messaging-Broker-Java-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 4.3. Virtualhost Nodes</td></tr></table></div></div> <hr/>
Modified: qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Exchanges.html URL: http://svn.apache.org/viewvc/qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Exchanges.html?rev=1722689&r1=1722688&r2=1722689&view=diff ============================================================================== --- qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Exchanges.html (original) +++ qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Exchanges.html Sat Jan 2 23:59:48 2016 @@ -114,25 +114,25 @@ https://github.com/apache/qpid-proton/bl <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-java-trunk/index.html">Qpid Java Trunk</a></li><li><a href="/releases/qpid-java-trunk/java-broker/book/index.html">AMQP Messaging Broker (Java)</a></li><li>4.6. Exchanges</li></ul> <div id="-middle-content"> - <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">4.6. Exchanges</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Concepts-Virtualhosts.html">Prev</a> </td><th align="center" width="60%">Chapter 4. Concepts</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Concepts-Queues.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="Java-Broker-Concepts-Exchanges"></a>4.6. Exchanges</h2></div></div></div><p>An <span class="emphasis"><em>Exchange</em></span> is a named entity within the <span class="emphasis"><em>Virtualhost</em></span> which receives + <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">4.6. Exchanges</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Concepts-Virtualhosts.html">Prev</a> </td><th align="center" width="60%">Chapter 4. Concepts</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Concepts-Queues.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Java-Broker-Concepts-Exchanges"></a>4.6. Exchanges</h2></div></div></div><p>An <span class="emphasis"><em>Exchange</em></span> is a named entity within the <span class="emphasis"><em>Virtualhost</em></span> which receives messages from producers and routes them to matching <span class="emphasis"><em>Queue</em></span>s within the <span class="emphasis"><em>Virtualhost</em></span>.</p><p>The server provides a set of exchange types with each exchange type implementing a different routing algorithm. For details of how these exchanges types work see <a class="xref" href="Java-Broker-Concepts-Exchanges.html#Java-Broker-Concepts-Exchanges-Types" title="4.6.2. Exchange Types">Section 4.6.2, “Exchange Types”</a> below.</p><p>The server predeclares a number of exchange instances with names starting with "<code class="literal">amq.</code>". These are defined in <a class="xref" href="Java-Broker-Concepts-Exchanges.html#Java-Broker-Concepts-Exchanges-Predeclared" title="4.6.1. Predeclared Exchanges">Section 4.6.1, “Predeclared Exchanges”</a>.</p><p>Applications can make use of the pre-declared exchanges, or they may declare their own. The number of exchanges within a <span class="emphasis"><em>Virtualhost</em></span> is limited only by resource constraints.</p><p>The behaviour when an <span class="emphasis"><em>Exchange</em></span> is unable to route a message to any queue is defined in <a class="xref" href="Java-Broker-Concepts-Exchanges.html#Java-Broker-Concepts-Exchanges-UnroutableMessage" title="4.6.4. Unrouteable Messages">Section 4.6.4, “Unrouteable Messages”</a></p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Exchanges-Predeclared"></a>4.6.1. Predeclared Exchanges</h3></div></div></div><p>Each <span class="emphasis"><em>Virtualhost</em></span> pre-declares the following exchanges: - </p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>amq.direct (an instance of a direct exchange)</p></li><li class="listitem"><p>amq.topic (an instance of a topic exchange)</p></li><li class="listitem"><p>amq.fanout (an instance of a fanout exchange)</p></li><li class="listitem"><p>amq.match (an instance of a headers exchange)</p></li></ul></div><p> + </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>amq.direct (an instance of a direct exchange)</p></li><li class="listitem"><p>amq.topic (an instance of a topic exchange)</p></li><li class="listitem"><p>amq.fanout (an instance of a fanout exchange)</p></li><li class="listitem"><p>amq.match (an instance of a headers exchange)</p></li></ul></div><p> </p><p>The conceptual "<code class="literal">default exchange</code>" always exists, effectively a special instance of direct exchange which uses the empty string as its name. All queues are automatically bound to it upon their creation using the queue name as the binding key, and unbound upon their deletion. It is not possible to manually add or remove bindings within this exchange.</p><p>Applications may not declare exchanges with names beginning with "<code class="literal">amq.</code>". Such names are reserved for system use.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Exchanges-Types"></a>4.6.2. Exchange Types</h3></div></div></div><p> The following Exchange types are supported. - </p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>Direct</p></li><li class="listitem"><p>Topic</p></li><li class="listitem"><p>Fanout</p></li><li class="listitem"><p>Headers</p></li></ul></div><p> + </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>Direct</p></li><li class="listitem"><p>Topic</p></li><li class="listitem"><p>Fanout</p></li><li class="listitem"><p>Headers</p></li></ul></div><p> These exchange types are described in the following sub-sections.</p><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Concepts-Exchanges-Types-Direct"></a>4.6.2.1. Direct</h4></div></div></div><p>The direct exchange type routes messages to queues based on an exact match between the routing key of the message, and the binding key used to bind the queue to the exchange. Additional filter rules may be specified using a <a class="link" href="Java-Broker-Concepts-Exchanges.html#Java-Broker-Concepts-Exchanges-BindingArguments-JMSSelector" title="4.6.3.1. JMS Selector"> binding argument specifying a JMS message selector</a>. </p><p>This exchange type is often used to implement point to point messaging. When used in this manner, the normal convention is that the binding key matches the name of the queue. It is also possible to use this exchange type - for multi-cast, in this case the same binding key is associated with many queues.</p><div class="figure"><a id="idm140601093578080"></a><p class="title"><strong>Figure 4.4. Direct exchange</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Direct exchange" src="images/Exchange-Direct.png" /></div></div></div><br class="figure-break" /><p>The figure above illustrates the operation of direct exchange type. The yellow messages published with the routing key + for multi-cast, in this case the same binding key is associated with many queues.</p><div class="figure"><a id="d0e619"></a><p class="title"><strong>Figure 4.4. Direct exchange</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Direct exchange" src="images/Exchange-Direct.png" /></div></div></div><br class="figure-break" /><p>The figure above illustrates the operation of direct exchange type. The yellow messages published with the routing key "<code class="literal">myqueue</code>" match the binding key corresponding to queue "<code class="literal">myqueue</code>" and so are routed there. The red messages published with the routing key "<code class="literal">foo</code>" match two bindings in the table so a copy of the message is routed to both the "<code class="literal">bar1</code>" and "<code class="literal">bar2</code>" queues.</p><p>The routing key of the blue message matches no binding keys, so the message is unroutable. It is handled as described @@ -140,36 +140,36 @@ https://github.com/apache/qpid-proton/bl binding key pattern defined by the queue binding. Routing keys are formed from one or more words, with each word delimited by a full-stop (.). The pattern matching characters are the * and # symbols. The * symbol matches a single word and the # symbol matches zero or more words.</p><p>Additional filter rules may be specified using a <a class="link" href="Java-Broker-Concepts-Exchanges.html#Java-Broker-Concepts-Exchanges-BindingArguments-JMSSelector" title="4.6.3.1. JMS Selector"> - binding argument specifying a JMS message selector</a>.</p><p>The following three figures help explain how the topic exchange functions.</p><p /><div class="figure"><a id="idm140601093566656"></a><p class="title"><strong>Figure 4.5. Topic exchange - exact match on topic name</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Topic exchange - exact match on topic name" src="images/Exchange-Topic.png" /></div></div></div><br class="figure-break" /><p>The figure above illustrates publishing messages with routing key "<code class="literal">weather</code>". The exchange routes each - message to every bound queue whose binding key matches the routing key.</p><p>In the case illustrated, this means that each subscriber's queue receives every yellow message.</p><div class="figure"><a id="idm140601093438576"></a><p class="title"><strong>Figure 4.6. Topic exchange - matching on hierarchical topic patterns</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Topic exchange - matching on hierarchical topic patterns" src="images/Exchange-Topic-Hierarchical.png" /></div></div></div><br class="figure-break" /><p>The figure above illustrates publishing messages with hierarchical routing keys. As before, the exchange routes each + binding argument specifying a JMS message selector</a>.</p><p>The following three figures help explain how the topic exchange functions.</p><p /><div class="figure"><a id="d0e661"></a><p class="title"><strong>Figure 4.5. Topic exchange - exact match on topic name</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Topic exchange - exact match on topic name" src="images/Exchange-Topic.png" /></div></div></div><br class="figure-break" /><p>The figure above illustrates publishing messages with routing key "<code class="literal">weather</code>". The exchange routes each + message to every bound queue whose binding key matches the routing key.</p><p>In the case illustrated, this means that each subscriber's queue receives every yellow message.</p><div class="figure"><a id="d0e674"></a><p class="title"><strong>Figure 4.6. Topic exchange - matching on hierarchical topic patterns</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Topic exchange - matching on hierarchical topic patterns" src="images/Exchange-Topic-Hierarchical.png" /></div></div></div><br class="figure-break" /><p>The figure above illustrates publishing messages with hierarchical routing keys. As before, the exchange routes each message to every bound queue whose binding key matches the routing key but as the binding keys contain wildcards, the wildcard rules described above apply.</p><p>In the case illustrated, <code class="literal">sub1</code> has received the red and green message as "<code class="literal">news.uk</code>" and "<code class="literal">news.de</code>" match binding key "<code class="literal">news.#</code>". The red message has also gone to <code class="literal">sub2</code> and <code class="literal">sub3</code> as it's routing key is matched exactly by "<code class="literal">news.uk</code>" and by "<code class="literal">*.uk</code>".</p><p>The routing key of the yellow message matches no binding keys, so the message is unroutable. It is handled as described - in <a class="xref" href="Java-Broker-Concepts-Exchanges.html#Java-Broker-Concepts-Exchanges-UnroutableMessage" title="4.6.4. Unrouteable Messages">Section 4.6.4, “Unrouteable Messages”</a>.</p><div class="figure"><a id="idm140601093429680"></a><p class="title"><strong>Figure 4.7. Topic exchange - matching on JMS message selector</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Topic exchange - matching on JMS message selector" src="images/Exchange-Topic-JMSSelector.png" /></div></div></div><br class="figure-break" /><p>The figure above illustrates messages with properties published with routing key "<code class="literal">shipping</code>".</p><p>As before, the exchange routes each message to every bound queue whose binding key matches the routing key but as a JMS selector + in <a class="xref" href="Java-Broker-Concepts-Exchanges.html#Java-Broker-Concepts-Exchanges-UnroutableMessage" title="4.6.4. Unrouteable Messages">Section 4.6.4, “Unrouteable Messages”</a>.</p><div class="figure"><a id="d0e712"></a><p class="title"><strong>Figure 4.7. Topic exchange - matching on JMS message selector</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Topic exchange - matching on JMS message selector" src="images/Exchange-Topic-JMSSelector.png" /></div></div></div><br class="figure-break" /><p>The figure above illustrates messages with properties published with routing key "<code class="literal">shipping</code>".</p><p>As before, the exchange routes each message to every bound queue whose binding key matches the routing key but as a JMS selector argument has been specified, the expression is evaluated against each matching message. Only messages whose message header values or properties match the expression are routed to the queue.</p><p>In the case illustrated, <code class="literal">sub1</code> has received the yellow and blue message as their property "<code class="literal">area</code>" cause expression "<code class="literal">area in ('Forties', 'Cromarty')</code>" to evaluate true. Similarly, the yellow message has also gone to <code class="literal">gale_alert</code> as its property "<code class="literal">speed</code>" causes expression "<code class="literal">speed > 7 and speed < 10</code>" to evaluate true.</p><p>The properties of purple message cause no expressions to evaluate true, so the message is unroutable. It is handled as described in <a class="xref" href="Java-Broker-Concepts-Exchanges.html#Java-Broker-Concepts-Exchanges-UnroutableMessage" title="4.6.4. Unrouteable Messages">Section 4.6.4, “Unrouteable Messages”</a>.</p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Concepts-Exchanges-Types-Fanout"></a>4.6.2.3. Fanout</h4></div></div></div><p>The fanout exchange type routes messages to all queues bound to the exchange, regardless of the message's routing key.</p><p>Filter rules may be specified using a <a class="link" href="Java-Broker-Concepts-Exchanges.html#Java-Broker-Concepts-Exchanges-BindingArguments-JMSSelector" title="4.6.3.1. JMS Selector"> - binding argument specifying a JMS message selector</a>.</p><div class="figure"><a id="idm140601093417696"></a><p class="title"><strong>Figure 4.8. Fanout exchange</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Fanout exchange" src="images/Exchange-Fanout.png" /></div></div></div><br class="figure-break" /></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Concepts-Exchanges-Types-Headers"></a>4.6.2.4. Headers</h4></div></div></div><p>The headers exchange type routes messages to queues based on header properties within the message. The message is passed to + binding argument specifying a JMS message selector</a>.</p><div class="figure"><a id="d0e759"></a><p class="title"><strong>Figure 4.8. Fanout exchange</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Fanout exchange" src="images/Exchange-Fanout.png" /></div></div></div><br class="figure-break" /></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Concepts-Exchanges-Types-Headers"></a>4.6.2.4. Headers</h4></div></div></div><p>The headers exchange type routes messages to queues based on header properties within the message. The message is passed to a queue if the header properties of the message satisfy the <a class="link" href="Java-Broker-Concepts-Exchanges.html#Java-Broker-Concepts-Exchanges-BindingArguments-x-match" title="4.6.3.2. x-match"> x-match expression</a> specified by the binding arguments with which the queue was bound. </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Exchanges-BindingArguments"></a>4.6.3. Binding Arguments</h3></div></div></div><p>Binding arguments are used by certain exchange types to further filter messages.</p><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Concepts-Exchanges-BindingArguments-JMSSelector"></a>4.6.3.1. JMS Selector</h4></div></div></div><p>The binding argument <code class="literal">x-filter-jms-selector</code> specifies a JMS selector conditional expression. The expression is written in terms of message header and message property names. If the expression evaluates to true, the message is routed to the queue. - This type of binding argument is understood by exchange types direct, topic and fanout.<a class="footnote" href="#ftn.idm140601093408192" id="idm140601093408192"><sup class="footnote">[5]</sup></a>.</p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Concepts-Exchanges-BindingArguments-x-match"></a>4.6.3.2. x-match</h4></div></div></div><p>The binding argument <code class="literal">x-match</code> is understood by exchange type headers. It can take two values, dictating how the - rest of the name value pairs are treated during matching.</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p><code class="literal">all</code> implies that all the other pairs must match the headers property of a message for that message to be routed + This type of binding argument is understood by exchange types direct, topic and fanout.<a class="footnote" href="#ftn.d0e786" id="d0e786"><sup class="footnote">[5]</sup></a>.</p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Concepts-Exchanges-BindingArguments-x-match"></a>4.6.3.2. x-match</h4></div></div></div><p>The binding argument <code class="literal">x-match</code> is understood by exchange type headers. It can take two values, dictating how the + rest of the name value pairs are treated during matching.</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p><code class="literal">all</code> implies that all the other pairs must match the headers property of a message for that message to be routed (i.e. an AND match)</p></li><li class="listitem"><p><code class="literal">any</code> implies that the message should be routed if any of the fields in the headers property match one of the fields in the arguments table (i.e. an OR match)</p></li></ul></div><p>A field in the bind arguments matches a field in the message if either the field in the bind arguments has no value and a field of the same name is present in the message headers or if the field in the bind arguments has a value and a field of the same name exists in the message headers and has that same value.</p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Exchanges-UnroutableMessage"></a>4.6.4. Unrouteable Messages</h3></div></div></div><p>If an exchange is unable to route a message to any queues, the Broker will: - </p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>If using AMQP 0-10 protocol, and an alternate exchange has been set on the exchange, the message is routed to the alternate exchange. + </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>If using AMQP 0-10 protocol, and an alternate exchange has been set on the exchange, the message is routed to the alternate exchange. The alternate exchange routes the message according to its routing algorithm and its binding table. If the messages is still unroutable, - the message is discarded.</p></li><li class="listitem"><p>If using AMQP protocols 0-8..0-9-1, and the publisher set the mandatory flag and the<a class="link" href="Java-Broker-Close-Connection-When-No-Route.html" title="9.5. Closing client connections on unroutable mandatory messages"> + the message is discarded.</p></li><li class="listitem"><p>If using AMQP protocols 0-8..0-9-1, and the publisher set the mandatory flag and the<a class="link" href="Java-Broker-Runtime-Close-Connection-When-No-Route.html" title="9.5. Closing client connections on unroutable mandatory messages"> close when no route</a> feature did not close the connection, the message is returned to the Producer.</p></li><li class="listitem"><p>Otherwise, the message is discarded.</p></li></ul></div><p> - </p></div><div class="footnotes"><br /><hr align="left" width="100" /><div class="footnote" id="ftn.idm140601093408192"><p><a class="para" href="#idm140601093408192"><sup class="para">[5] </sup></a> - This is a Qpid specific extension.</p></div></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Concepts-Virtualhosts.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Concepts.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Concepts-Queues.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">4.5. Virtualhosts </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> 4.7. Queues</td></tr></table></div></div> + </p></div><div class="footnotes"><br /><hr style="width:100; text-align:left;margin-left: 0" /><div class="footnote" id="ftn.d0e786"><p><a class="para" href="#d0e786"><sup class="para">[5] </sup></a> + This is a Qpid specific extension.</p></div></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Concepts-Virtualhosts.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Concepts.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Concepts-Queues.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">4.5. Virtualhosts </td><td align="center" width="20%"><a accesskey="h" href="AMQP-Messaging-Broker-Java-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 4.7. Queues</td></tr></table></div></div> <hr/> Modified: qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Other-Services.html URL: http://svn.apache.org/viewvc/qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Other-Services.html?rev=1722689&r1=1722688&r2=1722689&view=diff ============================================================================== --- qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Other-Services.html (original) +++ qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Other-Services.html Sat Jan 2 23:59:48 2016 @@ -114,14 +114,14 @@ https://github.com/apache/qpid-proton/bl <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-java-trunk/index.html">Qpid Java Trunk</a></li><li><a href="/releases/qpid-java-trunk/java-broker/book/index.html">AMQP Messaging Broker (Java)</a></li><li>4.10. Other Services</li></ul> <div id="-middle-content"> - <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">4.10. Other Services</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Concepts-Authentication-Providers.html">Prev</a> </td><th align="center" width="60%">Chapter 4. Concepts</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Initial-Configuration.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="Java-Broker-Concepts-Other-Services"></a>4.10. Other Services</h2></div></div></div><p> + <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">4.10. Other Services</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Concepts-Authentication-Providers.html">Prev</a> </td><th align="center" width="60%">Chapter 4. Concepts</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Initial-Configuration.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Java-Broker-Concepts-Other-Services"></a>4.10. Other Services</h2></div></div></div><p> The Broker can also have <span class="emphasis"><em>Access Control Providers</em></span>, <span class="emphasis"><em>Group Providers</em></span>, <span class="emphasis"><em>Keystores</em></span>, <span class="emphasis"><em>Trustores</em></span> and [Management] <span class="emphasis"><em>Plugins</em></span> configured. </p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Access-Control-Providers"></a>4.10.1. Access Control Providers</h3></div></div></div><p><span class="emphasis"><em>Access Control Providers</em></span> are used to authorize various operations relating to Broker objects.</p><p>Access Control Provider configuration and management details are covered in <a class="xref" href="Java-Broker-Security-ACLs.html" title="8.3. Access Control Lists">Section 8.3, “Access Control Lists”</a>.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Group-Providers"></a>4.10.2. Group Providers</h3></div></div></div><p><span class="emphasis"><em>Group Providers</em></span> are used to aggregate authenticated user principals into groups - which can be then be used in Access Control rules applicable to the whole group.</p><p>Group Provider configuration and management is covered in <a class="xref" href="Java-Broker-Security-Group-Providers.html" title="8.2. Group Providers">Section 8.2, “Group Providers”</a>.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Keystores"></a>4.10.3. Keystores</h3></div></div></div><p><span class="emphasis"><em>Keystores</em></span> are used to configure details of keystores holding SSL keys and certificates - for the SSL transports on Ports.</p><p>Keystore configuration and management is covered in <a class="xref" href="Java-Broker-Management-Managing-Keystores.html" title="7.12. Keystores">Section 7.12, “Keystores”</a>.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Truststores"></a>4.10.4. Truststores</h3></div></div></div><p><span class="emphasis"><em>Truststores </em></span> are used to configure details of keystores holding SSL certificates - for trusting Client Certificate on SSL ports. - </p><p>Truststore configuration and management is covered in <a class="xref" href="Java-Broker-Management-Managing-Truststores.html" title="7.13. Truststores">Section 7.13, “Truststores”</a>.</p></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Concepts-Authentication-Providers.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Concepts.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Initial-Configuration.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">4.9. Authentication Providers </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> Chapter 5. Initial Configuration</td></tr></table></div></div> + which can be then be used in Access Control rules applicable to the whole group.</p><p>Group Provider configuration and management is covered in <a class="xref" href="Java-Broker-Security-Group-Providers.html" title="8.2. Group Providers">Section 8.2, “Group Providers”</a>.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Keystores"></a>4.10.3. Keystores</h3></div></div></div><p><span class="emphasis"><em>Keystores</em></span> are used to configure SSL private and public keys and certificates + for the SSL transports on Ports.</p><p>Keystore configuration and management is covered in <a class="xref" href="Java-Broker-Management-Managing-Keystores.html" title="7.12. Keystores">Section 7.12, “Keystores”</a>.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Truststores"></a>4.10.4. Truststores</h3></div></div></div><p><span class="emphasis"><em>Truststores</em></span> are used to configure SSL certificates for trusting Client Certificate + on SSL ports or making SSL connections to other external services like LDAP, etc.</p><p>Truststore configuration and management is covered in <a class="xref" href="Java-Broker-Management-Managing-Truststores.html" title="7.13. Truststores">Section 7.13, “Truststores”</a>.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Loggers"></a>4.10.5. Loggers</h3></div></div></div><p><span class="emphasis"><em>Loggers</em></span> are responsible for producing a log of events from either the Broker as a whole, or + an individual Virtualhost. These are described in <a class="xref" href="Java-Broker-Runtime.html#Java-Broker-Runtime-Logging" title="9.1. Logging">Section 9.1, “Logging”</a>.</p></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Concepts-Authentication-Providers.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Concepts.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Initial-Configuration.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">4.9. Authentication Providers </td><td align="center" width="20%"><a accesskey="h" href="AMQP-Messaging-Broker-Java-Book.html">Home</a></td><td align="right" valign="top" width="40%"> Chapter 5. Initial Configuration</td></tr></table></div></div> <hr/> Modified: qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Ports.html URL: http://svn.apache.org/viewvc/qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Ports.html?rev=1722689&r1=1722688&r2=1722689&view=diff ============================================================================== --- qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Ports.html (original) +++ qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Ports.html Sat Jan 2 23:59:48 2016 @@ -114,18 +114,18 @@ https://github.com/apache/qpid-proton/bl <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-java-trunk/index.html">Qpid Java Trunk</a></li><li><a href="/releases/qpid-java-trunk/java-broker/book/index.html">AMQP Messaging Broker (Java)</a></li><li>4.8. Ports</li></ul> <div id="-middle-content"> - <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">4.8. Ports</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Concepts-Queues.html">Prev</a> </td><th align="center" width="60%">Chapter 4. Concepts</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Concepts-Authentication-Providers.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="Java-Broker-Concepts-Ports"></a>4.8. Ports</h2></div></div></div><p> The Broker supports configuration of <span class="emphasis"><em>Ports</em></span> to specify the particular - AMQP messaging and HTTP/JMX management connectivity it offers for use. </p><p> Each Port is configured with the particular <span class="emphasis"><em>Protocols</em></span> and + <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">4.8. Ports</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Concepts-Queues.html">Prev</a> </td><th align="center" width="60%">Chapter 4. Concepts</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Concepts-Authentication-Providers.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Java-Broker-Concepts-Ports"></a>4.8. Ports</h2></div></div></div><p> The Broker supports configuration of <span class="emphasis"><em>Ports</em></span> to specify the particular + AMQP messaging and HTTP management connectivity it offers for use. </p><p> Each Port is configured with the particular <span class="emphasis"><em>Protocols</em></span> and <span class="emphasis"><em>Transports</em></span> it supports, as well as the <span class="emphasis"><em>Authentication Provider</em></span> to be used to authenticate connections. Where SSL is in use, the <span class="emphasis"><em>Port</em></span> configuration also defines which <span class="emphasis"><em>Keystore</em></span> to use and (where supported) which <span class="emphasis"><em>TrustStore(s)</em></span> and whether Client Certificates should be requested/required. </p><p> Different <span class="emphasis"><em>Ports</em></span> can support different protocols, and many - <span class="emphasis"><em>Ports</em></span> can be configured on the Broker.</p><p> The following AMQP protocols are currently supported by the Broker: </p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p><span class="emphasis"><em>AMQP 0-8</em></span></p></li><li class="listitem"><p><span class="emphasis"><em>AMQP 0-9</em></span></p></li><li class="listitem"><p><span class="emphasis"><em>AMQP 0-9-1</em></span></p></li><li class="listitem"><p><span class="emphasis"><em>AMQP 0-10</em></span></p></li><li class="listitem"><p><span class="emphasis"><em>AMQP 1.0</em></span></p></li></ul></div><p> - </p><p> Additionally, HTTP and JMX ports can be configured for use by the associated management - plugins. </p><p>This diagram explains how Ports, <a class="link" href="Java-Broker-Concepts-Authentication-Providers.html" title="4.9. Authentication Providers">Authentication Providers</a> + <span class="emphasis"><em>Ports</em></span> can be configured on the Broker.</p><p> The following AMQP protocols are currently supported by the Broker: </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p><span class="emphasis"><em>AMQP 0-8</em></span></p></li><li class="listitem"><p><span class="emphasis"><em>AMQP 0-9</em></span></p></li><li class="listitem"><p><span class="emphasis"><em>AMQP 0-9-1</em></span></p></li><li class="listitem"><p><span class="emphasis"><em>AMQP 0-10</em></span></p></li><li class="listitem"><p><span class="emphasis"><em>AMQP 1.0</em></span></p></li></ul></div><p> + </p><p> Additionally, HTTP ports can be configured for use by the associated management + plugin. </p><p>This diagram explains how Ports, <a class="link" href="Java-Broker-Concepts-Authentication-Providers.html" title="4.9. Authentication Providers">Authentication Providers</a> and an Access Control Provider work together to allow an application to form a connection to - a Virtualhost.</p><div class="figure"><a id="idm140601093275232"></a><p class="title"><strong>Figure 4.9. Control flow during Authentication</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Control flow during Authentication" src="images/Broker-PortAuthFlow.png" /></div></div></div><p><br class="figure-break" /></p></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Concepts-Queues.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Concepts.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Concepts-Authentication-Providers.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">4.7. Queues </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> 4.9. Authenticat ion Providers</td></tr></table></div></div> + a Virtualhost.</p><div class="figure"><a id="d0e1261"></a><p class="title"><strong>Figure 4.9. Control flow during Authentication</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Control flow during Authentication" src="images/Broker-PortAuthFlow.png" /></div></div></div><p><br class="figure-break" /></p></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Concepts-Queues.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Concepts.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Concepts-Authentication-Providers.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">4.7. Queues </td><td align="center" width="20%"><a accesskey="h" href="AMQP-Messaging-Broker-Java-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 4.9.&# 160;Authentication Providers</td></tr></table></div></div> <hr/> Modified: qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Queues.html URL: http://svn.apache.org/viewvc/qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Queues.html?rev=1722689&r1=1722688&r2=1722689&view=diff ============================================================================== --- qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Queues.html (original) +++ qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Queues.html Sat Jan 2 23:59:48 2016 @@ -114,23 +114,24 @@ https://github.com/apache/qpid-proton/bl <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-java-trunk/index.html">Qpid Java Trunk</a></li><li><a href="/releases/qpid-java-trunk/java-broker/book/index.html">AMQP Messaging Broker (Java)</a></li><li>4.7. Queues</li></ul> <div id="-middle-content"> - <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">4.7. Queues</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Concepts-Exchanges.html">Prev</a> </td><th align="center" width="60%">Chapter 4. Concepts</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Concepts-Ports.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="Java-Broker-Concepts-Queues"></a>4.7. Queues</h2></div></div></div><p><span class="emphasis"><em>Queue</em></span>s are named entities within a <a class="link" href="Java-Broker-Concepts-Virtualhosts.html" title="4.5. Virtualhosts">Virtualhost</a> that + <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">4.7. Queues</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Concepts-Exchanges.html">Prev</a> </td><th align="center" width="60%">Chapter 4. Concepts</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Concepts-Ports.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Java-Broker-Concepts-Queues"></a>4.7. Queues</h2></div></div></div><p><span class="emphasis"><em>Queue</em></span>s are named entities within a <a class="link" href="Java-Broker-Concepts-Virtualhosts.html" title="4.5. Virtualhosts">Virtualhost</a> that hold/buffer messages for later delivery to consumer applications. An <a class="link" href="Java-Broker-Concepts-Exchanges.html" title="4.6. Exchanges">Exchange</a> for passing messages to a queue. - Consumers subscribe to a queue in order to receive messages for it. </p><p>The Broker supports different queue types, each with different delivery semantics. It also messages on a queue to be treated as a group.</p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Queues-Types"></a>4.7.1. Types</h3></div></div></div><p>The Broker supports four different queue types, each with different delivery semantics.</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p><a class="link" href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queues-Types-Standard" title="4.7.1.1. Standard">Standard</a> - a simple First-In-First-Out (FIFO) queue</p></li><li class="listitem"><p><a class="link" href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queues-Types-Priority" title="4.7.1.2. Priority">Priority</a> - delivery order depends on the priority of each message</p></li><li class="lis titem"><p><a class="link" href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queues-Types-Sorted" title="4.7.1.3. Sorted Queues">Sorted</a> - + Consumers subscribe to a queue in order to receive messages for it. </p><p>The Broker supports different queue types, each with different delivery semantics. Queues also have the ability to group messages + together for delivery to a single consumer.</p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Queues-Types"></a>4.7.1. Types</h3></div></div></div><p>The Broker supports four different queue types, each with different delivery semantics.</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p><a class="link" href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queues-Types-Standard" title="4.7.1.1. Standard">Standard</a> - a simple First-In-First-Out (FIFO) queue</p></li><li class="listitem"><p><a class="link" href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queues-Types-Priority" title="4.7.1.2. Priority">Priority</a> - delivery order depends on the priority of each message</p></li><li class="listitem"><p><a class="link" href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queues-Types-Sorted" title="4.7.1.3. Sorted Queues">Sorte d</a> - delivery order depends on the value of the sorting key property in each message</p></li><li class="listitem"><p><a class="link" href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queues-Types-LVQ" title="4.7.1.4. Last Value Queues (LVQ)">Last Value Queue</a> - also known as an LVQ, retains only the last (newest) message received with a given LVQ key value</p></li></ul></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Concepts-Queues-Types-Standard"></a>4.7.1.1. Standard</h4></div></div></div><p>A simple First-In-First-Out (FIFO) queue</p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Concepts-Queues-Types-Priority"></a>4.7.1.2. Priority</h4></div></div></div><p>In a priority queue, messages on the queue are delivered in an order determined by the - <a class="ulink" href="http://docs.oracle.com/javaee/6/api/javax/jms/Message.html#getJMSPriority()" target="_top">JMS priority message + <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/Message.html#getJMSPriority()" target="_top">JMS priority message header</a> within the message. By default Qpid supports the 10 priority levels - mandated by JMS, with priority value 0 as the lowest priority and 9 as the highest. </p><p>It is possible to reduce the effective number of priorities if desired.</p><p>JMS defines the <a class="ulink" href="http://docs.oracle.com/javaee/6/api/javax/jms/Message.html#DEFAULT_PRIORITY"; target="_top"> + mandated by JMS, with priority value 0 as the lowest priority and 9 as the highest. </p><p>It is possible to reduce the effective number of priorities if desired.</p><p>JMS defines the <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/Message.html#DEFAULT_PRIORITY"; target="_top"> default message priority</a> as 4. Messages sent without a specified priority use this default. </p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Concepts-Queues-Types-Sorted"></a>4.7.1.3. Sorted Queues</h4></div></div></div><p>Sorted queues allow the message delivery order to be determined by value of an arbitrary - <a class="ulink" href="http://docs.oracle.com/javaee/6/api/javax/jms/Message.html#getStringProperty()" target="_top">JMS message + <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/Message.html#getStringProperty()" target="_top">JMS message property</a>. Sort order is alpha-numeric and the property value must have a type java.lang.String.</p><p>Messages sent to a sorted queue without the specified JMS message property will be - inserted into the 'last' position in the queue.</p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Concepts-Queues-Types-LVQ"></a>4.7.1.4. Last Value Queues (LVQ)</h4></div></div></div><p>LVQs (or conflation queues) are special queues that automatically discard any message + put at the head of the queue.</p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Concepts-Queues-Types-LVQ"></a>4.7.1.4. Last Value Queues (LVQ)</h4></div></div></div><p>LVQs (or conflation queues) are special queues that automatically discard any message when a newer message arrives with the same key value. The key is specified by arbitrary - <a class="ulink" href="http://docs.oracle.com/javaee/6/api/javax/jms/Message.html#getPropertyNames()" target="_top">JMS message + <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/Message.html#getPropertyNames()" target="_top">JMS message property</a>.</p><p>An example of an LVQ might be where a queue represents prices on a stock exchange: when you first consume from the queue you get the latest quote for each stock, and then as new prices come in you are sent only these updates. </p><p>Like other queues, LVQs can either be browsed or consumed from. When browsing an @@ -138,8 +139,8 @@ https://github.com/apache/qpid-proton/bl allows for many subscriptions to browse the same LVQ (i.e. you do not need to create and bind a separate LVQ for each subscriber who wishes to receive the contents of the LVQ).</p><p>Messages sent to an LVQ without the specified property will be delivered as normal and - will never be "replaced".</p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Queues-QueueDeclareArguments"></a>4.7.2. Queue Declare Arguments</h3></div></div></div><p>To create a priority, sorted or LVQ queue programmatically from JMX or AMQP, pass the - appropriate queue-declare arguments.</p><div class="table"><a id="idm140601093367072"></a><p class="title"><strong>Table 4.1. Queue-declare arguments understood for priority, sorted and LVQ queues</strong></p><div class="table-contents"><table border="1" summary="Queue-declare arguments understood for priority, sorted and LVQ queues"><colgroup><col /><col /><col /><col /></colgroup><thead><tr><th>Queue type</th><th>Argument name</th><th>Argument name</th><th>Argument Description</th></tr></thead><tbody><tr><td>priority</td><td>x-qpid-priorities</td><td>java.lang.Integer</td><td>Specifies a priority queue with given number priorities</td></tr><tr><td>sorted</td><td>qpid.queue_sort_key</td><td>java.lang.String</td><td>Specifies sorted queue with given message property used to sort the + will never be "replaced".</p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Queues-QueueDeclareArguments"></a>4.7.2. Queue Declare Arguments</h3></div></div></div><p>To create a priority, sorted or LVQ queue programmatically from AMQP, pass the + appropriate queue-declare arguments.</p><div class="table"><a id="d0e921"></a><p class="title"><strong>Table 4.1. Queue-declare arguments understood for priority, sorted and LVQ queues</strong></p><div class="table-contents"><table border="1" summary="Queue-declare arguments understood for priority, sorted and LVQ queues"><colgroup><col /><col /><col /><col /></colgroup><thead><tr><th>Queue type</th><th>Argument name</th><th>Argument name</th><th>Argument Description</th></tr></thead><tbody><tr><td>priority</td><td>x-qpid-priorities</td><td>java.lang.Integer</td><td>Specifies a priority queue with given number priorities</td></tr><tr><td>sorted</td><td>qpid.queue_sort_key</td><td>java.lang.String</td><td>Specifies sorted queue with given message property used to sort the entries</td></tr><tr><td>lvq</td><td>qpid.last_value_queue_key</td><td>java.lang.String</td><td>Specifies lvq queue with given message property used to conflate the entries</td></tr></tbody></table></div></div><br class="table-break" /></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Queues-Message-Grouping"></a>4.7.3. Messaging Grouping</h3></div></div></div><p> The broker allows messaging applications to classify a set of related messages as belonging to a group. This allows a message producer to indicate to the consumer that a group @@ -160,10 +161,10 @@ https://github.com/apache/qpid-proton/bl same group would have the same group identifier value. The key that identifies the header must also be known to the message consumers. This allows the consumers to determine a message's assigned group. </p><p> The header that is used to hold the group identifier, as well as the values used as - group identifiers, are totally under control of the application. </p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Concepts-Queues-BrokerRole"></a>4.7.3.2.  The Role of the Broker in Message Grouping </h4></div></div></div><p> The broker will apply the following processing on each grouped message: </p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>Enqueue a received message on the destination queue.</p></li><li class="listitem"><p>Determine the message's group by examining the message's group identifier + group identifiers, are totally under control of the application. </p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Concepts-Queues-BrokerRole"></a>4.7.3.2.  The Role of the Broker in Message Grouping </h4></div></div></div><p> The broker will apply the following processing on each grouped message: </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>Enqueue a received message on the destination queue.</p></li><li class="listitem"><p>Determine the message's group by examining the message's group identifier header.</p></li><li class="listitem"><p>Enforce <span class="emphasis"><em>consumption ordering</em></span> among messages belonging to the same group. <span class="emphasis"><em>Consumption ordering</em></span> means one of two things - depending on how the queue has been configured. </p><div class="itemizedlist"><ul class="itemizedlist" type="circle"><li class="listitem"><p> In default mode, a group gets assigned to a single consumer for the lifetime + depending on how the queue has been configured. </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; "><li class="listitem"><p> In default mode, a group gets assigned to a single consumer for the lifetime of that consumer, and the broker will pass all subsequent messages in the group to that consumer. </p></li><li class="listitem"><p>In 'shared groups' mode (which gives the same behaviour as the Qpid C++ Broker) the broker enforces a looser guarantee, namely that all the @@ -174,7 +175,7 @@ https://github.com/apache/qpid-proton/bl all of its acquired messages then the broker <span class="emphasis"><em>may</em></span> pass the next pending message in that group to a different consumer. </p></li></ul></div></li></ul></div><p> </p><p> The absence of a value in the designated group header field of a message is treated as - follows: </p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p> In default mode, failure for a message to specify a group is treated as a desire + follows: </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> In default mode, failure for a message to specify a group is treated as a desire for the message not to be grouped at all. Such messages will be distributed to any available consumer, without the ordering quarantees imposed by grouping. </p></li><li class="listitem"><p> In 'shared groups' mode (which gives the same behaviour as the Qpid C++ Broker) the broker assigns messages without a group value to a 'default group'. Therefore, all @@ -198,46 +199,46 @@ https://github.com/apache/qpid-proton/bl environment (using -D) before creating your consumer. </p><p>A default for all client connections can be set via a system property: </p><pre class="programlisting"> -Dmax_prefetch=1 </pre><p> The prefetch can be also be adjusted on a per connection basis by adding a - <code class="varname">maxprefetch</code> value to the <a class="ulink" href="../../Programming-In-Apache-Qpid/html/QpidJNDI.html#section-jms-connection-url" target="_top">Connection URLs</a> + <code class="varname">maxprefetch</code> value to the <a class="link" href="../../jms-client-0-8/book/JMS-Client-0-8-Connection-URL.html" target="_top">Connection URLs</a> </p><pre class="programlisting"> amqp://guest:guest@client1/development?maxprefetch='1'&brokerlist='tcp://localhost:5672' </pre><p>Setting the Qpid pre-fetch to 1 will give exact queue-type semantics as perceived by the client however, this brings a performance cost. You could test with a slightly higher - pre-fetch to trade-off between throughput and exact semantics.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Queue-EnsureNonDestructiveConsumers"></a>4.7.5. Forcing all consumers to be non-destructive</h3></div></div></div><p>When a consumer attaches to a queue, the normal behaviour is that messages are + pre-fetch to trade-off between throughput and exact semantics.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Queue-EnsureNonDestructiveConsumers"></a>4.7.5. Forcing all consumers to be non-destructive</h3></div></div></div><p>When a consumer attaches to a queue, the normal behaviour is that messages are sent to that consumer are acquired exclusively by that consumer, and when the consumer - acknowledges them, the messages are removed from the queue.</p><p>Another common pattern is to have queue "browsers" which send all messages to the - browser, but do not prevent other consumers from receiving the messages, and do not - remove them from the queue when the browser is done with them. Such a browser is an + acknowledges them, the messages are removed from the queue.</p><p>Another common pattern is to have queue "browsers" which send all messages to the + browser, but do not prevent other consumers from receiving the messages, and do not + remove them from the queue when the browser is done with them. Such a browser is an instance of a "non-destructive" consumer.</p><p>If every consumer on a queue is non destructive then we can obtain some interesting behaviours. In the case of a LVQ then the queue will always contain the most up to date value for every key. For a standard queue, if every consumer is non-destructive then we have something that behaves like a topic (every consumer receives every message) except that instead of only seeing messages that arrive after the point at which the consumer is created, all - messages which have not been removed due to TTL expiry (or, in the case of LVQs, + messages which have not been removed due to TTL expiry (or, in the case of LVQs, overwirtten by newer values for the same key).</p><p>A queue can be created to enforce all consumers are non-destructive. This can be - be achieved using the following queue declare argument:</p><div class="table"><a id="idm140601093315856"></a><p class="title"><strong>Table 4.2. </strong></p><div class="table-contents"><table border="1"><colgroup><col /><col /><col /></colgroup><thead><tr><th>Argument Name</th><th>Argument Type</th><th>Argument Description</th></tr></thead><tbody><tr><td>qpid.ensure_nondestructive_consumers</td><td>java.lang.Boolean</td><td>Set to true if the queue should make all consumers attached to it behave - non-destructively. (Default is false).</td></tr></tbody></table></div></div><br class="table-break" /><p>Through the <a class="link" href="Java-Broker-Management-Channel-REST-API.html" title="6.3. REST API">REST</a> api, + be achieved using the following queue declare argument:</p><div class="table"><a id="d0e1104"></a><p class="title"><strong>Table 4.2. </strong></p><div class="table-contents"><table border="1"><colgroup><col /><col /><col /></colgroup><thead><tr><th>Argument Name</th><th>Argument Type</th><th>Argument Description</th></tr></thead><tbody><tr><td>qpid.ensure_nondestructive_consumers</td><td>java.lang.Boolean</td><td>Set to true if the queue should make all consumers attached to it behave + non-destructively. (Default is false).</td></tr></tbody></table></div></div><br class="table-break" /><p>Through the <a class="link" href="Java-Broker-Management-Channel-REST-API.html" title="6.3. REST API">REST</a> api, the equivalent attribute is named <code class="varname">ensureNondestructiveConsumers</code>. - </p><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="idm140601093308400"></a>4.7.5.1. Bounding size using min/max TTL</h4></div></div></div><p>For queues other than LVQs, having only non-destructive consumers could mean that - messages would never get deleted, leaving the queue to grow unconstrainedly. To + </p><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e1130"></a>4.7.5.1. Bounding size using min/max TTL</h4></div></div></div><p>For queues other than LVQs, having only non-destructive consumers could mean that + messages would never get deleted, leaving the queue to grow unconstrainedly. To prevent this you can use the ability to set the maximum TTL of the queue. To ensure all messages have the same TTL you could also set the minimum TTL to the same value. </p><p>Minimum/Maximum TTL for a queue can be set though the HTTP Management UI, using the - REST API or by hand editing the configuration file (for JSON configuration stores). - The attribute names are <code class="varname">minimumMessageTtl</code> and - <code class="varname">maximumMessageTtl</code> and the TTL value is given in milliseconds.</p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="idm140601093305088"></a>4.7.5.2. Choosing to receive messages based on arrival time</h4></div></div></div><p>A queue with no destructive consumers will retain all messages until they expire - due to TTL. It may be the case that a consumer only wishes to receive messages - that have been sent in the last 60 minutes, and any new messages that arrive, or + REST API or by hand editing the configuration file (for JSON configuration stores). + The attribute names are <code class="varname">minimumMessageTtl</code> and + <code class="varname">maximumMessageTtl</code> and the TTL value is given in milliseconds.</p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e1143"></a>4.7.5.2. Choosing to receive messages based on arrival time</h4></div></div></div><p>A queue with no destructive consumers will retain all messages until they expire + due to TTL. It may be the case that a consumer only wishes to receive messages + that have been sent in the last 60 minutes, and any new messages that arrive, or alternatively it may wish only to receive newly arriving messages and not any that are already in the queue. This can be achieved by using a filter on the arrival time.</p><p>A special parameter <code class="varname">x-qpid-replay-period</code> can be used in the consumer declaration to control the messages the consumer wishes to receive. The value of <code class="varname">x-qpid-replay-period</code> is the time, in seconds, for which - the consumer wishes to see messages. A replay period of 0 indicates only newly - arriving messages should be sent. A replay period of 3600 indicates that only + the consumer wishes to see messages. A replay period of 0 indicates only newly + arriving messages should be sent. A replay period of 3600 indicates that only messages sent in the last hour - along with any newly arriving messages - should be - sent.</p><div class="table"><a id="idm140601093301648"></a><p class="title"><strong>Table 4.3. Setting the replay period</strong></p><div class="table-contents"><table border="1" summary="Setting the replay period"><colgroup><col /><col /></colgroup><thead><tr><th>Syntax</th><th>Example</th></tr></thead><tbody><tr><td>Addressing</td><td>myqueue : { link : { x-subscribe: { arguments : { x-qpid-replay-period : '3600' } } } }</td></tr><tr><td>Binding URL</td><td>direct://amq.direct/myqueue/myqueue?x-qpid-replay-period='3600'</td></tr></tbody></table></div></div><br class="table-break" /></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="idm140601093294816"></a>4.7.5.3. Setting a default filter</h4></div></div></div><p>A common case might be that the desired default behaviour is that newly attached consumers + sent.</p><div class="table"><a id="d0e1156"></a><p class="title"><strong>Table 4.3. Setting the replay period</strong></p><div class="table-contents"><table border="1" summary="Setting the replay period"><colgroup><col /><col /></colgroup><thead><tr><th>Syntax</th><th>Example</th></tr></thead><tbody><tr><td>Addressing</td><td>myqueue : { link : { x-subscribe: { arguments : { x-qpid-replay-period : '3600' } } } }</td></tr><tr><td>Binding URL</td><td>direct://amq.direct/myqueue/myqueue?x-qpid-replay-period='3600'</td></tr></tbody></table></div></div><br class="table-break" /></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e1177"></a>4.7.5.3. Setting a default filter</h4></div></div></div><p>A common case might be that the desired default behaviour is that newly attached consumers see only newly arriving messages (i.e. standard topic-like behaviour) but other consumers may wish to start their message stream from some point in the past. This can be achieved by setting a default filter on the queue so that consumers which do not explicitly set a replay @@ -250,7 +251,7 @@ amqp://guest:guest@client1/development?m If the desired default behaviour is that each consumer should see all messages arriving in the last minute, as well as all new messages then the value would need to be:</p><pre class="screen"> { "x-qpid-replay-period" : { "x-qpid-replay-period" : [ "60" ] } } - </pre></div></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Concepts-Exchanges.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Concepts.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Concepts-Ports.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">4.6. Exchanges </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> 4.8. Ports</td></tr></table></div></div> + </pre></div></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Concepts-Exchanges.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Concepts.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Concepts-Ports.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">4.6. Exchanges </td><td align="center" width="20%"><a accesskey="h" href="AMQP-Messaging-Broker-Java-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 4.8. Ports</td></tr></table></div></div> <hr/> Modified: qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-RemoteReplicationNodes.html URL: http://svn.apache.org/viewvc/qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-RemoteReplicationNodes.html?rev=1722689&r1=1722688&r2=1722689&view=diff ============================================================================== --- qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-RemoteReplicationNodes.html (original) +++ qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-RemoteReplicationNodes.html Sat Jan 2 23:59:48 2016 @@ -114,8 +114,8 @@ https://github.com/apache/qpid-proton/bl <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-java-trunk/index.html">Qpid Java Trunk</a></li><li><a href="/releases/qpid-java-trunk/java-broker/book/index.html">AMQP Messaging Broker (Java)</a></li><li>4.4. Remote Replication Nodes</li></ul> <div id="-middle-content"> - <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">4.4. Remote Replication Nodes</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Concepts-Virtualhost-Nodes.html">Prev</a> </td><th align="center" width="60%">Chapter 4. Concepts</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Concepts-Virtualhosts.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="Java-Broker-Concepts-RemoteReplicationNodes"></a>4.4. Remote Replication Nodes</h2></div></div></div><p>Used for HA only. A <span class="emphasis"><em>remote replication node</em></span> is a representation of - another virtualhost node in the group.</p></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Concepts-Virtualhost-Nodes.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Concepts.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Concepts-Virtualhosts.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">4.3. Virtualhost Nodes </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> 4.5. Virtualhosts</td></tr></table></div></div> + <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">4.4. Remote Replication Nodes</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Concepts-Virtualhost-Nodes.html">Prev</a> </td><th align="center" width="60%">Chapter 4. Concepts</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Concepts-Virtualhosts.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Java-Broker-Concepts-RemoteReplicationNodes"></a>4.4. Remote Replication Nodes</h2></div></div></div><p>Used for HA only. A <span class="emphasis"><em>remote replication node</em></span> is a representation of + another virtualhost node in the group.</p></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Concepts-Virtualhost-Nodes.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Concepts.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Concepts-Virtualhosts.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">4.3. Virtualhost Nodes </td><td align="center" width="20%"><a accesskey="h" href="AMQP-Messaging-Broker-Java-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 4.5. Virtualhosts</td></tr></table></div></div> <hr/> Modified: qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Virtualhost-Nodes.html URL: http://svn.apache.org/viewvc/qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Virtualhost-Nodes.html?rev=1722689&r1=1722688&r2=1722689&view=diff ============================================================================== --- qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Virtualhost-Nodes.html (original) +++ qpid/site/docs/releases/qpid-java-trunk/java-broker/book/Java-Broker-Concepts-Virtualhost-Nodes.html Sat Jan 2 23:59:48 2016 @@ -114,13 +114,13 @@ https://github.com/apache/qpid-proton/bl <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-java-trunk/index.html">Qpid Java Trunk</a></li><li><a href="/releases/qpid-java-trunk/java-broker/book/index.html">AMQP Messaging Broker (Java)</a></li><li>4.3. Virtualhost Nodes</li></ul> <div id="-middle-content"> - <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">4.3. Virtualhost Nodes</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Concepts-Broker.html">Prev</a> </td><th align="center" width="60%">Chapter 4. Concepts</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Concepts-RemoteReplicationNodes.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="Java-Broker-Concepts-Virtualhost-Nodes"></a>4.3. Virtualhost Nodes</h2></div></div></div><p>A <span class="emphasis"><em>virtualhost node</em></span> is a container for the virtualhost. It has exactly + <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">4.3. Virtualhost Nodes</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Concepts-Broker.html">Prev</a> </td><th align="center" width="60%">Chapter 4. Concepts</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Concepts-RemoteReplicationNodes.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Java-Broker-Concepts-Virtualhost-Nodes"></a>4.3. Virtualhost Nodes</h2></div></div></div><p>A <span class="emphasis"><em>virtualhost node</em></span> is a container for the virtualhost. It has exactly one virtualhost.</p><p>A <span class="emphasis"><em>virtualhost node</em></span> is backed by storage. This storage is used to record the durable entities that exist beneath the virtualhost node (the virtualhost, queues, exchanges etc).</p><p>When HA is in use, it is the virtualhost nodes of many Brokers that come together to form the group. The virtualhost nodes together elect a master. When the high availability feature is in use, the virtualhost node has <a class="link" href="Java-Broker-Concepts-RemoteReplicationNodes.html" title="4.4. Remote Replication Nodes">remote replications nodes</a>. There is a remote replication node corresponding to each - remote virtualhost node that form part of the group.</p></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Concepts-Broker.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Concepts.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Concepts-RemoteReplicationNodes.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">4.2. Broker </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> 4.4. Remote Replication Nodes</td></tr></table></div></div> + remote virtualhost node that form part of the group.</p></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Concepts-Broker.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Concepts.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Concepts-RemoteReplicationNodes.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">4.2. Broker </td><td align="center" width="20%"><a accesskey="h" href="AMQP-Messaging-Broker-Java-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 4.4. Remote Replication Nodes</td></tr></table></div></div> <hr/> --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
