| <!DOCTYPE html> |
| <!-- |
| - |
| - Licensed to the Apache Software Foundation (ASF) under one |
| - or more contributor license agreements. See the NOTICE file |
| - distributed with this work for additional information |
| - regarding copyright ownership. The ASF licenses this file |
| - to you under the Apache License, Version 2.0 (the |
| - "License"); you may not use this file except in compliance |
| - with the License. You may obtain a copy of the License at |
| - |
| - http://www.apache.org/licenses/LICENSE-2.0 |
| - |
| - Unless required by applicable law or agreed to in writing, |
| - software distributed under the License is distributed on an |
| - "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| - KIND, either express or implied. See the License for the |
| - specific language governing permissions and limitations |
| - under the License. |
| - |
| --> |
| <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> |
| <head> |
| <title>Chapter 4. Concepts - Apache Qpid™</title> |
| <meta http-equiv="X-UA-Compatible" content="IE=edge"/> |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"/> |
| <link rel="stylesheet" href="/site.css" type="text/css" async="async"/> |
| <link rel="stylesheet" href="/deferred.css" type="text/css" defer="defer"/> |
| <script type="text/javascript">var _deferredFunctions = [];</script> |
| <script type="text/javascript" src="/deferred.js" defer="defer"></script> |
| <!--[if lte IE 8]> |
| <link rel="stylesheet" href="/ie.css" type="text/css"/> |
| <script type="text/javascript" src="/html5shiv.js"></script> |
| <![endif]--> |
| |
| <!-- Redirects for `go get` and godoc.org --> |
| <meta name="go-import" |
| content="qpid.apache.org git https://gitbox.apache.org/repos/asf/qpid-proton.git"/> |
| <meta name="go-source" |
| content="qpid.apache.org |
| https://github.com/apache/qpid-proton/blob/go1/README.md |
| https://github.com/apache/qpid-proton/tree/go1{/dir} |
| https://github.com/apache/qpid-proton/blob/go1{/dir}/{file}#L{line}"/> |
| </head> |
| <body> |
| <div id="-content"> |
| <div id="-top" class="panel"> |
| <a id="-menu-link"><img width="16" height="16" src="" alt="Menu"/></a> |
| |
| <a id="-search-link"><img width="22" height="16" src="" alt="Search"/></a> |
| |
| <ul id="-global-navigation"> |
| <li><a id="-logotype" href="/index.html">Apache Qpid<sup>™</sup></a></li> |
| <li><a href="/documentation.html">Documentation</a></li> |
| <li><a href="/download.html">Download</a></li> |
| <li><a href="/discussion.html">Discussion</a></li> |
| </ul> |
| </div> |
| |
| <div id="-menu" class="panel" style="display: none;"> |
| <div class="flex"> |
| <section> |
| <h3>Project</h3> |
| |
| <ul> |
| <li><a href="/overview.html">Overview</a></li> |
| <li><a href="/components/index.html">Components</a></li> |
| <li><a href="/releases/index.html">Releases</a></li> |
| </ul> |
| </section> |
| |
| <section> |
| <h3>Messaging APIs</h3> |
| |
| <ul> |
| <li><a href="/proton/index.html">Qpid Proton</a></li> |
| <li><a href="/components/jms/index.html">Qpid JMS</a></li> |
| <li><a href="/components/messaging-api/index.html">Qpid Messaging API</a></li> |
| </ul> |
| </section> |
| |
| <section> |
| <h3>Servers and tools</h3> |
| |
| <ul> |
| <li><a href="/components/broker-j/index.html">Broker-J</a></li> |
| <li><a href="/components/cpp-broker/index.html">C++ broker</a></li> |
| <li><a href="/components/dispatch-router/index.html">Dispatch router</a></li> |
| </ul> |
| </section> |
| |
| <section> |
| <h3>Resources</h3> |
| |
| <ul> |
| <li><a href="/dashboard.html">Dashboard</a></li> |
| <li><a href="https://cwiki.apache.org/confluence/display/qpid/Index">Wiki</a></li> |
| <li><a href="/resources.html">More resources</a></li> |
| </ul> |
| </section> |
| </div> |
| </div> |
| |
| <div id="-search" class="panel" style="display: none;"> |
| <form action="http://www.google.com/search" method="get"> |
| <input type="hidden" name="sitesearch" value="qpid.apache.org"/> |
| <input type="text" name="q" maxlength="255" autofocus="autofocus" tabindex="1"/> |
| <button type="submit">Search</button> |
| <a href="/search.html">More ways to search</a> |
| </form> |
| </div> |
| |
| <div id="-middle" class="panel"> |
| <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li><a href="/releases/index.html">Releases</a></li><li><a href="/releases/qpid-broker-j-7.1.9/index.html">Qpid Broker-J 7.1.9</a></li><li><a href="/releases/qpid-broker-j-7.1.9/book/index.html">Apache Qpid Broker-J</a></li><li>Chapter 4. Concepts</li></ul> |
| |
| <div id="-middle-content"> |
| <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">Chapter 4. Concepts</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Getting-Started-CommandLine.html">Prev</a> </td><th align="center" width="60%"> </th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Concepts-Broker.html">Next</a></td></tr></table><hr /></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a id="Java-Broker-Concepts"></a>Chapter 4. Concepts</h1></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="section"><a href="Java-Broker-Concepts.html#Java-Broker-Concepts-Overview">4.1. Overview</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Broker.html">4.2. Broker</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Virtualhost-Nodes.html">4.3. Virtualhost Nodes</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-RemoteReplicationNodes.html">4.4. Remote Replication Nodes</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Virtualhosts.html">4.5. Virtualhosts</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Exchanges.html">4.6. Exchanges</a></span></dt><dd><dl><dt><span class="section"><a href="Java-Broker-Concepts-Exchanges.html#Java-Broker-Concepts-Exchanges-Predeclared">4.6.1. Predeclared Exchanges</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Exchanges.html#Java-Broker-Concepts-Exchanges-Types">4.6.2. Exchange Types</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Exchanges.html#Java-Broker-Concepts-Exchanges-BindingArguments">4.6.3. Binding Arguments</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Exchanges.html#Java-Broker-Concepts-Exchanges-UnroutableMessage">4.6.4. Unrouteable Messages</a></span></dt></dl></dd><dt><span class="section"><a href="Java-Broker-Concepts-Queues.html">4.7. Queues</a></span></dt><dd><dl><dt><span class="section"><a href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queues-Types">4.7.1. Types</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queues-Message-Grouping">4.7.2. Messaging Grouping</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queue-EnsureNonDestructiveConsumers">4.7.3. Forcing all consumers to be non-destructive</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queue-HoldingEntries">4.7.4. Holding messages on a Queue</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queue-OverflowPolicy">4.7.5. Controlling Queue Size</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queues-SetLowPrefetch">4.7.6. Using low pre-fetch with special queue types</a></span></dt></dl></dd><dt><span class="section"><a href="Java-Broker-Concepts-Ports.html">4.8. Ports</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Authentication-Providers.html">4.9. Authentication Providers</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Other-Services.html">4.10. Other Services</a></span></dt><dd><dl><dt><span class="section"><a href="Java-Broker-Concepts-Other-Services.html#Java-Broker-Concepts-Access-Control-Providers">4.10.1. Access Control Providers</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Other-Services.html#Java-Broker-Concepts-Group-Providers">4.10.2. Group Providers</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Other-Services.html#Java-Broker-Concepts-Keystores">4.10.3. Keystores</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Other-Services.html#Java-Broker-Concepts-Truststores">4.10.4. Truststores</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Other-Services.html#Java-Broker-Concepts-Loggers">4.10.5. Loggers</a></span></dt></dl></dd></dl></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Java-Broker-Concepts-Overview"></a>4.1. Overview</h2></div></div></div><p>The Broker comprises a number of entities. This section summaries the purpose of each of |
| the entities and describes the relationships between them. These details are developed further |
| in the sub-sections that follow.</p><p>The most important entity is the <span class="emphasis"><em>Virtualhost</em></span>. A virtualhost is an |
| independent container in which messaging is performed. A <span class="emphasis"><em>virtualhost</em></span> exists |
| in a container called a <span class="emphasis"><em>virtualhost node</em></span>. A virtualhost node has exactly |
| one virtualhost.</p><p>An <span class="emphasis"><em>Exchange</em></span> accepts messages from a producer application and routes these |
| to one or more <span class="emphasis"><em>Queues</em></span> according to pre-arranged criteria called |
| <span class="emphasis"><em>bindings</em></span>. Exchange are an AMQP 0-8, 0-9, 0-9-1, 0-10 concept. They exist to |
| produce useful messaging behaviours such as fanout. When using AMQP 0-8, 0-9, 0-9-1, or 0-10, the |
| exchange is the only way ingressing a message into the virtualhost. When using AMQP |
| 1.0, the application may route messages using an exchange (to take advantage of advanced behaviours) |
| or it may publish messages direct to a queue. |
| </p><p><span class="emphasis"><em>Queue</em></span>s are named entities that hold/buffer messages for later delivery to |
| consumer applications. |
| </p><p><span class="emphasis"><em>Ports</em></span> accept connections for messaging and management. The Broker |
| supports any number of ports. When connecting for messaging, the user specifies a virtualhost |
| name to indicate the virtualhost to which it is to be connected.</p><p><span class="emphasis"><em>Authentication Providers</em></span> assert the identity of the user as it connects |
| for messaging or management. The Broker supports any number of authentication providers. Each |
| port is associated with exactly one authentication provider. The port uses the authentication |
| provider to assert the identity of the user as new connections are received.</p><p><span class="emphasis"><em>Group Providers</em></span> provide mechanisms that provide grouping of users. A |
| Broker supports zero or more group providers.</p><p><span class="emphasis"><em>Access Control Provider</em></span> allows the abilities of users (or groups of |
| users) to be restrained. A Broker can have zero or one access control providers.</p><p><span class="emphasis"><em>Keystores</em></span> provide a repositories of certificates and are used when the |
| Broker accepts SSL connections. Any number of keystore providers can be defined. Keystores are |
| be associated with Ports defined to accepts SSL.</p><p><span class="emphasis"><em>Truststores</em></span> provide a repositories of trust and are used to validate a |
| peer. Any number of truststore provides can be defined. Truststores can be associated with Ports |
| and other entities that form SSL connections.</p><p><span class="emphasis"><em>Remote Replication Nodes</em></span> are used when the high availability feature is |
| in use. It is the remote representation of other virtualhost nodes that form part of the same |
| group.</p><p><span class="emphasis"><em>Loggers</em></span>, at this point in the hierarchy, are responsible for the |
| production of a log for the Broker.</p><p>These concepts will be developed over the forthcoming pages. The diagrams below also help |
| put these entities in context of one and other.</p><p> |
| </p><div class="figure"><a id="d0e399"></a><p class="title"><strong>Figure 4.1. Message Flow through Key Entities</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Message Flow through the Key Entities of the Broker" src="images/Broker-MessageFlow.png" /></div></div></div><p><br class="figure-break" /> |
| </p><p> |
| </p><div class="figure"><a id="d0e411"></a><p class="title"><strong>Figure 4.2. Broker Structure showing major entities</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Broker Structure" src="images/Broker-Model.png" /></div></div></div><p><br class="figure-break" /> |
| </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-Getting-Started-CommandLine.html">Prev</a> </td><td align="center" width="20%"> </td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Concepts-Broker.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">3.5. Using the command line </td><td align="center" width="20%"><a accesskey="h" href="Apache-Qpid-Broker-J-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 4.2. Broker</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="/security.html">Security</a></li> |
| <li><a href="http://www.apache.org/"><img id="-apache-feather" width="48" height="14" src="" alt="Apache"/></a></li> |
| </ul> |
| |
| <p id="-legal"> |
| Apache Qpid, Messaging built on AMQP; Copyright © 2015 |
| 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> |
| </div> |
| </body> |
| </html> |
