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Posted to commits@qpid.apache.org by or...@apache.org on 2018/09/02 21:01:56 UTC
[47/51] [partial] qpid-site git commit: QPID-8237: Update site for
Qpid Java release 6.1.7
http://git-wip-us.apache.org/repos/asf/qpid-site/blob/d1947fd4/content/releases/qpid-java-6.1.7/java-broker/book/Java-Broker-Concepts-Ports.html
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+
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+ <input type="text" name="q" maxlength="255" autofocus="autofocus" tabindex="1"/>
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+
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+ <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li><a href="/releases/index.html">Releases</a></li><li><a href="/releases/qpid-java-6.1.7/index.html">Qpid for Java 6.1.7</a></li><li><a href="/releases/qpid-java-6.1.7/java-broker/book/index.html">Apache Qpid Broker for 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" 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" 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="d0e1289"></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>
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http://git-wip-us.apache.org/repos/asf/qpid-site/blob/d1947fd4/content/releases/qpid-java-6.1.7/java-broker/book/Java-Broker-Concepts-Queues.html
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+https://github.com/apache/qpid-proton/blob/go1{/dir}/{file}#L{line}"/>
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+ <li><a href="/proton/index.html">Qpid Proton</a></li>
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+ </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>
+
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+ <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>
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+ <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"/>
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+
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+ <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li><a href="/releases/index.html">Releases</a></li><li><a href="/releases/qpid-java-6.1.7/index.html">Qpid for Java 6.1.7</a></li><li><a href="/releases/qpid-java-6.1.7/java-broker/book/index.html">Apache Qpid Broker for 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" 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. 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="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="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="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
+ 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="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
+ individual subscriber does not remove the message from the queue when receiving it. This
+ 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 AMQP, pass the
+ appropriate queue-declare arguments.</p><div class="table"><a id="d0e933"></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
+ of messages should be considered a single logical operation with respect to the application. </p><p> The broker can use this group identification to enforce policies controlling how messages
+ from a given group can be distributed to consumers. For instance, the broker can be configured
+ to guarantee all the messages from a particular group are processed in order across multiple
+ consumers. </p><p> For example, assume we have a shopping application that manages items in a virtual
+ shopping cart. A user may add an item to their shopping cart, then change their mind and
+ remove it. If the application sends an <span class="emphasis"><em>add</em></span> message to the broker,
+ immediately followed by a <span class="emphasis"><em>remove</em></span> message, they will be queued in the
+ proper order - <span class="emphasis"><em>add</em></span>, followed by <span class="emphasis"><em>remove</em></span>. </p><p> However, if there are multiple consumers, it is possible that once a consumer acquires
+ the <span class="emphasis"><em>add</em></span> message, a different consumer may acquire the
+ <span class="emphasis"><em>remove</em></span> message. This allows both messages to be processed in parallel,
+ which could result in a "race" where the <span class="emphasis"><em>remove</em></span> operation is incorrectly
+ performed before the <span class="emphasis"><em>add</em></span> operation. </p><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Concepts-Queues-GroupingMessages"></a>4.7.3.1. Grouping Messages</h4></div></div></div><p> In order to group messages, the application would designate a particular message header
+ as containing a message's <span class="emphasis"><em>group identifier</em></span>. The group identifier stored
+ in that header field would be a string value set by the message producer. Messages from the
+ 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" 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" 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
+ <span class="emphasis"><em>currently unacknowledged messages</em></span> in a group are sent to
+ the same consumer, but the consumer used may change over time even if the
+ consumers do not. This means that only one consumer can be processing messages
+ from a particular group at any given time, however if the consumer acknowledges
+ 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" 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
+ such "unidentified" messages are considered by the broker as part of the same group,
+ which will handled like any other group. The name of this default group is
+ "qpid.no-group", although it can be customised as detailed below. </p></li></ul></div><p>
+ </p><p> Note that message grouping has no effect on queue browsers.</p><p> Note well that distinct message groups would not block each other from delivery. For
+ example, assume a queue contains messages from two different message groups - say group "A"
+ and group "B" - and they are enqueued such that "A"'s messages are in front of "B". If the
+ first message of group "A" is in the process of being consumed by a client, then the
+ remaining "A" messages are blocked, but the messages of the "B" group are available for
+ consumption by other consumers - even though it is "behind" group "A" in the queue. </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Queues-SetLowPrefetch"></a>4.7.4. Using low pre-fetch with special queue types</h3></div></div></div><p>Qpid clients receive buffered messages in batches, sized according to the pre-fetch value.
+ The current default is 500. </p><p>However, if you use the default value you will probably <span class="emphasis"><em>not</em></span> see
+ desirable behaviour when using priority, sorted, lvq or grouped queues. Once the broker has
+ sent a message to the client its delivery order is then fixed, regardless of the special
+ behaviour of the queue. </p><p>For example, if using a priority queue and a prefetch of 100, and 100 messages arrive with
+ priority 2, the broker will send these messages to the client. If then a new message arrives
+ with priority 1, the broker cannot leap frog messages of lower priority. The priority 1 will
+ be delivered at the front of the next batch of messages to be sent to the client.</p><p> So, you need to set the prefetch values for your client (consumer) to make this sensible.
+ To do this set the Java system property <code class="varname">max_prefetch</code> on the client
+ 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="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
+ 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
+ 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,
+ 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="d0e1116"></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="d0e1142"></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="d0e1155"></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
+ messages sent in the last hour - along with any newly arriving messages - should be
+ sent.</p><div class="table"><a id="d0e1168"></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="d0e1189"></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
+ period get a default (in this case the desired default would be 0).</p><p>The default filter set for a queue can be set via the REST API using the attribute named
+ <code class="varname">defaultFilters</code>. This value is a map from filter name to type and arguments.
+ To set the default behaviour for the queue to be that consumers only receive newly arrived
+ messages, then you should set this attribute to the value:</p><pre class="screen">
+ { "x-qpid-replay-period" : { "x-qpid-replay-period" : [ "0" ] } }
+ </pre><p>
+ 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 class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Concepts-Queue-HoldingEntries"></a>4.7.6. Holding messages on a Queue</h3></div></div></div><p>Sometimes it is required that while a message has been placed on a queue, it is not released to consumers
+ until some external condition is met. </p><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e1210"></a>4.7.6.1. Hold until valid</h4></div></div></div><p>Currently Queues support the "holding" of messages until a (per-message) provided point in time.
+ By default this support is not enabled (since it requires extra work to be performed against every
+ message entering the queue. To enable support, the attribute <code class="varname">holdOnPublishEnabled</code>
+ must evaluate to true for the Queue. When enabled messages on the queue will be checked for the header
+ (for AMQP 0-8, 0-9, 0-9-1 and 0-10 messages) or message annotation (for AMQP 1.0 messages)
+ <code class="varname">x-qpid-not-valid-before</code>. If this header/annotation exists and contains a numeric value,
+ it will be treated as a point in time given in milliseconds since the UNIX epoch. The message will not
+ be released from the Queue to consumers until this time has been reached.
+ </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-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>
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+
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+ <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>
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+https://github.com/apache/qpid-proton/blob/go1/README.md
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+https://github.com/apache/qpid-proton/blob/go1{/dir}/{file}#L{line}"/>
+ </head>
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+ <li><a href="/components/index.html">Components</a></li>
+ <li><a href="/releases/index.html">Releases</a></li>
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+ </section>
+
+ <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"/>
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+
+ <div id="-middle" class="panel">
+ <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li><a href="/releases/index.html">Releases</a></li><li><a href="/releases/qpid-java-6.1.7/index.html">Qpid for Java 6.1.7</a></li><li><a href="/releases/qpid-java-6.1.7/java-broker/book/index.html">Apache Qpid Broker for 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" 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="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/>
+
+ <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>
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+ The Apache Software Foundation; Licensed under
+ the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache
+ License, Version 2.0</a>; Apache Qpid, Qpid, Qpid Proton,
+ Proton, Apache, the Apache feather logo, and the Apache Qpid
+ project logo are trademarks of The Apache Software
+ Foundation; All other marks mentioned may be trademarks or
+ registered trademarks of their respective owners
+ </p>
+ </div>
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+ </body>
+</html>
http://git-wip-us.apache.org/repos/asf/qpid-site/blob/d1947fd4/content/releases/qpid-java-6.1.7/java-broker/book/Java-Broker-Concepts-Virtualhosts.html
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@@ -0,0 +1,158 @@
+<!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.
+ -
+-->
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+ <head>
+ <title>4.5. Virtualhosts - Apache Qpid™</title>
+ <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
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+ </ul>
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+
+ <div id="-menu" class="panel" style="display: none;">
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+
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+ <li><a href="/components/index.html">Components</a></li>
+ <li><a href="/releases/index.html">Releases</a></li>
+ </ul>
+ </section>
+
+ <section>
+ <h3>Messaging APIs</h3>
+
+ <ul>
+ <li><a href="/proton/index.html">Qpid Proton</a></li>
+ <li><a href="/components/jms/index.html">Qpid JMS</a></li>
+ <li><a href="/components/messaging-api/index.html">Qpid Messaging API</a></li>
+ </ul>
+ </section>
+
+ <section>
+ <h3>Servers and tools</h3>
+
+ <ul>
+ <li><a href="/components/broker-j/index.html">Broker-J</a></li>
+ <li><a href="/components/cpp-broker/index.html">C++ broker</a></li>
+ <li><a href="/components/dispatch-router/index.html">Dispatch router</a></li>
+ </ul>
+ </section>
+
+ <section>
+ <h3>Resources</h3>
+
+ <ul>
+ <li><a href="/dashboard.html">Dashboard</a></li>
+ <li><a href="https://cwiki.apache.org/confluence/display/qpid/Index">Wiki</a></li>
+ <li><a href="/resources.html">More resources</a></li>
+ </ul>
+ </section>
+ </div>
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+
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+ <form action="http://www.google.com/search" method="get">
+ <input type="hidden" name="sitesearch" value="qpid.apache.org"/>
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+ </form>
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+
+ <div id="-middle" class="panel">
+ <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li><a href="/releases/index.html">Releases</a></li><li><a href="/releases/qpid-java-6.1.7/index.html">Qpid for Java 6.1.7</a></li><li><a href="/releases/qpid-java-6.1.7/java-broker/book/index.html">Apache Qpid Broker for Java</a></li><li>4.5. Virtualhosts</li></ul>
+
+ <div id="-middle-content">
+ <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">4.5. Virtualhosts</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Concepts-RemoteReplicationNodes.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-Exchanges.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-Virtualhosts"></a>4.5. Virtualhosts</h2></div></div></div><p>A virtualhost is a namespace in which messaging is performed. Virtualhosts are independent;
+ the messaging that goes on within one virtualhost is independent of any messaging that goes on
+ in another virtualhost. For instance, a queue named <span class="emphasis"><em>foo</em></span> defined in one
+ virtualhost is completely independent of a queue named <span class="emphasis"><em>foo</em></span> in another
+ virtualhost.</p><p>A virtualhost is identified by a name which must be unique broker-wide. Clients use the name
+ to identify the virtualhost to which they wish to connect when they connect.</p><p>A virtualhost exists in a container called a virtualhost node.</p><p>The virtualhost 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><span class="emphasis"><em>Exchanges</em></span> is a named entity within the Virtual Host which receives
+ messages from producers and routes them to matching Queues.</p><p><span class="emphasis"><em>Queues</em></span> are named entities that hold messages for delivery to consumer
+ applications.</p><p><span class="emphasis"><em>Bindings</em></span> are relationships between Exchanges and Queue that facilitate
+ routing of messages from the Exchange to the Queue.</p><p><span class="emphasis"><em>Connections</em></span> represent a live connection to the virtualhost from a
+ messaging client.</p><p>A <span class="emphasis"><em>Session</em></span> represents a context for the production or consumption of
+ messages. A Connection can have many Sessions.</p><p>A <span class="emphasis"><em>Consumer</em></span> represents a live consumer that is attached to queue.</p><p><span class="emphasis"><em>Loggers</em></span> are responsible for producing logs for this virtualhost.</p><p> The following diagram depicts the Virtualhost model: </p><div class="figure"><a id="d0e503"></a><p class="title"><strong>Figure 4.3. Virtualhost Model showing major entities</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Virtual Host Model" src="images/VirtualHost-Model.png" /></div></div></div><p><br class="figure-break" />
+ </p><p>A <span class="emphasis"><em>virtualhost</em></span> is backed by storage which is used to store the
+ messages.</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-RemoteReplicationNodes.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-Exchanges.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">4.4. Remote Replication 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%"> 4.6. Exchanges</td></tr></table></div></div>
+
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+
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+
+ <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
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+</html>
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diff --git a/content/releases/qpid-java-6.1.7/java-broker/book/Java-Broker-Concepts.html b/content/releases/qpid-java-6.1.7/java-broker/book/Java-Broker-Concepts.html
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@@ -0,0 +1,168 @@
+<!DOCTYPE html>
+<!--
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+ - Licensed to the Apache Software Foundation (ASF) under one
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+ - 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
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+ - KIND, either express or implied. See the License for the
+ - specific language governing permissions and limitations
+ - under the License.
+ -
+-->
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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+ <title>Chapter 4. Concepts - Apache Qpid™</title>
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+https://github.com/apache/qpid-proton/blob/go1{/dir}/{file}#L{line}"/>
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+ <div id="-content">
+ <div id="-top" class="panel">
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+
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+ <li><a href="/documentation.html">Documentation</a></li>
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+ <li><a href="/discussion.html">Discussion</a></li>
+ </ul>
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+ <li><a href="/components/index.html">Components</a></li>
+ <li><a href="/releases/index.html">Releases</a></li>
+ </ul>
+ </section>
+
+ <section>
+ <h3>Messaging APIs</h3>
+
+ <ul>
+ <li><a href="/proton/index.html">Qpid Proton</a></li>
+ <li><a href="/components/jms/index.html">Qpid JMS</a></li>
+ <li><a href="/components/messaging-api/index.html">Qpid Messaging API</a></li>
+ </ul>
+ </section>
+
+ <section>
+ <h3>Servers and tools</h3>
+
+ <ul>
+ <li><a href="/components/broker-j/index.html">Broker-J</a></li>
+ <li><a href="/components/cpp-broker/index.html">C++ broker</a></li>
+ <li><a href="/components/dispatch-router/index.html">Dispatch router</a></li>
+ </ul>
+ </section>
+
+ <section>
+ <h3>Resources</h3>
+
+ <ul>
+ <li><a href="/dashboard.html">Dashboard</a></li>
+ <li><a href="https://cwiki.apache.org/confluence/display/qpid/Index">Wiki</a></li>
+ <li><a href="/resources.html">More resources</a></li>
+ </ul>
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+ <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li><a href="/releases/index.html">Releases</a></li><li><a href="/releases/qpid-java-6.1.7/index.html">Qpid for Java 6.1.7</a></li><li><a href="/releases/qpid-java-6.1.7/java-broker/book/index.html">Apache Qpid Broker for Java</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 Messa
ges</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-QueueDeclareArguments">4.7.2. Queue Declare Arguments</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queues-Message-Grouping">4.7.3. Messaging Grouping</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queues-SetLowPrefetch">4.7.4. Using low pre-fetch with special queue types</a></span></dt><dt><span class="section"><a href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queue-EnsureNonDestructiveConsumers">4.7.5. Forcing all consumers to be non-destructive</a></span></dt><dt><span class="section"><a href="Java-Br
oker-Concepts-Queues.html#Java-Broker-Concepts-Queue-HoldingEntries">4.7.6. Holding messages on a Queue</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 namespace 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><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="d0e392"></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="d0e404"></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="AMQP-Messaging-Broker-Java-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 4.2. Broker</td></tr></table></div></div>
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