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From build...@apache.org
Subject svn commit: r996304 [2/2] - in /websites/production/activemq/content: activemq-connection-uris.html cache/main.pageCache configuring-transports.html configuring-version-5-transports.html per-destination-policies.html
Date Tue, 30 Aug 2016 19:22:14 GMT
Modified: websites/production/activemq/content/per-destination-policies.html
==============================================================================
--- websites/production/activemq/content/per-destination-policies.html (original)
+++ websites/production/activemq/content/per-destination-policies.html Tue Aug 30 19:22:14
2016
@@ -81,7 +81,7 @@
   <tbody>
         <tr>
         <td valign="top" width="100%">
-<div class="wiki-content maincontent"><p>We support a number of different policies
which can be attached to individual destinations (queues, topics) or to wildcards of queue/topic
hierarchies. This makes it easy to configure how different regions of the JMS destination
space are handled.</p><p>The properties you can set on a Destination are as follows:</p><div
class="table-wrap"><table class="confluenceTable"><tbody><tr><th colspan="1"
rowspan="1" class="confluenceTh"><p>Common Property</p></th><th colspan="1"
rowspan="1" class="confluenceTh"><p>Default Value</p></th><th colspan="1"
rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>producerFlowControl</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>If <strong><code>true</code></strong>
the broker will throttle (flow-control) the producer. Throttling is achieved eith
 er by withholding the producer's ACK or by raising a&#160;<strong><code>javax.jms.ResourceAllocationException</code></strong>
(that's propagated back to the client) when local resources e.g., memory and/or storage, have
been exhausted.</p><p>If&#160;<strong><code>false</code></strong>
excess messages will be written to the message store to prevent memory exhaustion. However,
when the message store reaches capacity the producer will be throttled until resources are
freed.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>enableAudit</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>When&#160;<strong><code>true</code></strong>
the broker will track duplicate messages. Duplicates can happen for non-persistent messages
during failover.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>useCache</code></p></td><td
colspan="1" rowspan="1" class="c
 onfluenceTd"><p><code>true</code></p></td><td colspan="1"
rowspan="1" class="confluenceTd"><p>If&#160;<strong><code>true</code></strong>
persistent messages are cached for fast retrieval from store.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>maxPageSize</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>200</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The maximum number of messages to
page in from the store at one time. Increase this value to improve performance for queue destination's
that contain grouped messages that are consumed by multiple concurrent consumers.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>maxBrowsePageSize</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>400</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The maximum number of messages to
page in from the store at one time for a browser.</p></td></tr><tr><td
colspa
 n="1" rowspan="1" class="confluenceTd"><p><code>memoryLimit</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The memory limit (in bytes) of the
destination's cursor.</p><p>This memory limit is subordinate to the system level
memory limit, as specified by the&#160;<a shape="rect" href="producer-flow-control.html"><code>&lt;systemUsage&gt;/&lt;memoryUsage&gt;</code></a>
<span class="confluence-link">attribute</span>. There is no default for this value;
it simply acts as a child to the overall broker memory until the broker memory is exhausted.</p><p><strong>Note</strong>:
when this limit is specified the destination's&#160;<strong><code>cursorMemoryHighWaterMark</code></strong>
will be applied against it and not the&#160;<strong><code>&lt;systemUsage&gt;/&gt;&lt;memoryUsage&gt;</code></strong>
memory limit.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>minimumMes
 sageSize</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>1024</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>For non-serialized messages (embedded
broker) - the assumed size of the message used for memory usage calculation. Serialized messages
use the serialized size as the basis for the memory calculation.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>cursorMemoryHighWaterMark</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>70</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The percentage (%) threshold applied
either to the&#160;<strong><code>&lt;systemUsage&gt;/&lt;memoryUsage&gt;</code></strong>
or the destination's&#160;<strong><code>memoryLimit</code></strong>
(when defined) which when exceeded will cause the destination's cursor to either block or
write to disk.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>storeUsageHighWaterMark</
 code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>100</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The percentage (%) threshold of the&#160;<strong><code>&lt;systemUsage&gt;/&lt;storeUsage&gt;</code></strong>
store limit which when exceeded causes a send to block.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>prioritizedMessages</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Persist message priority information.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>advisoryForConsumed</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message when a message
is consumed by a client.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><code>advisoryForDelivery</code></
 p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message when a message
is sent to a client.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><code>advisoryForSlowConsumers</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message if a consumer
is deemed slow.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>advsioryForFastProducers</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message if a producer
is deemed fast.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>advisoryWhenFull</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspa
 n="1" rowspan="1" class="confluenceTd"><p>Send an advisory message when a limit
(memory, store, temp disk) is full.</p></td></tr><tr><td colspan="1"
rowspan="1" class="confluenceTd"><p><code>includeBodyForAdvisory</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Includes the body of the original
message that triggered the advisory as part of the&#160;<strong><code>dataStructure</code></strong>
field in the advisory message (where applicable). Normally the message body is cleared.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>gcInactiveDestinations</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Garbage collect inactive destinations.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>inactiveTimoutBeforeGC</code></p></td><td
colspan="1" row
 span="1" class="confluenceTd"><p><code>5000</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The timeout (in ms) after which a
destination is considered inactive.</p></td></tr><tr><td colspan="1"
rowspan="1" class="confluenceTd"><p><span><code>usePrefetchExtension</code><br
clear="none"></span></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The prefetch extension is used when
a&#160;message is delivered but not ACK'ed, such that the broker can dispatch&#160;another
message, e.g., <code>prefetch == 0</code>, the idea being that there will always
be prefetch number of messages pending. It also allows a transaction batch to exceed the prefetch&#160;value.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>slowConsumerStrategy</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>null</code></p></td><td
colspan="1" rowspan="1" class="con
 fluenceTd"><p>Sets the strategy for handling slow consumers. See <a shape="rect"
class="external-link" href="http://svn.apache.org/repos/asf/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/policy/AbortSlowConsumerStrategy.java">abortSlowConsumerStrategy.</a></p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>maxDestinations</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>-1</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>(v5.12) If&#160;<strong><code>0</code></strong>
or greater, sets the maximum number of destinations that can be created. This parameter is
intended to limit the number of hierarchical destinations that can be created under a wildcard
destination.</p></td></tr></tbody></table></div><p>Additional
properties for a Queue</p><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th
colspan="1" rowspan="1" class="confluenceTh"><p>Queue only property</p></th><th
col
 span="1" rowspan="1" class="confluenceTh"><p>Default Value</p></th><th
colspan="1" rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>useConsumerPriority</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Use the priority of a consumer when
dispatching messages from a Queue.</p></td></tr><tr><td colspan="1"
rowspan="1" class="confluenceTd"><p><code>strictOrderDispatch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>If&#160;<strong><code>true</code></strong>
queue will not round robin consumers, but it'll use a single one until its prefetch buffer
is full.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>optimizedDispatch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false
 </code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>Don't
use a separate thread for dispatching from a Queue.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>lazyDispatch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Only page in from store the number
of messages that can be dispatched at time.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>consumersBeforeDispatchStarts</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>0</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>When the first consumer connects,
wait for specified number of consumers before message dispatching starts.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>timeBeforeDispatchStarts</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>0</code></p></td><td
colspan="
 1" rowspan="1" class="confluenceTd"><p>When the first consumer connects, wait for
specified time (in ms) before message dispatching starts.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>queuePrefetch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Sets the prefetch for consumers that
are using the default value.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><code>expireMessagesPeriod</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>30000</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The period (in ms) of checks for
message expiry on queued messages, value of 0 disables.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>persistJMSRedelivered</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="c
 onfluenceTd"><p>(v 5.10) If true, before a persistent message is dispatched by the
broker for the first time, the message is rewritten to reflect the possible delivery.</p><p>This
ensures the message&#160;<strong><code>JMSRedelivered</code></strong>
header is a reliable indication of possible duplicate delivery.</p></td></tr></tbody></table></div><p>Additional
properties for a Topic</p><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th
colspan="1" rowspan="1" class="confluenceTh"><p>Topic only property</p></th><th
colspan="1" rowspan="1" class="confluenceTh"><p>Default Value</p></th><th
colspan="1" rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>topicPrefetch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Sets the prefetch for topic consumers
that are using the default value.</p></td></tr><tr><t
 d colspan="1" rowspan="1" class="confluenceTd"><p><code>durableTopicPrefetch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Sets the prefetch for durable topic
consumers that are using the default value.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>advisoryForDiscardingMessages</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory when a message is
discarded from a non durable subscription.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><span style="color: rgb(0,0,0);"><code>alwaysRetroactive</code><br
clear="none"></span></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Makes all subscribers retroactive
negating the need to modify the clien
 ts to enable this feature.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><span style="color: rgb(0,0,0);"><code>expireMessagesPeriod</code><br
clear="none"></span></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>30000</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The interval (in ms) between message
expiration checks on inactive durable subscribers.</p><p><strong>Note</strong>:
set to <strong><code>0</code></strong> to disable message expiration
checking.</p></td></tr></tbody></table></div><p><span
style="line-height: 1.4285715;">The following are examples of different policies that can
be customized on a per destination basis:</span></p><ul><li><a
shape="rect" href="dispatch-policies.html">Dispatch Policies</a></li></ul><p>Here
is an <a shape="rect" class="external-link" href="http://svn.apache.org/repos/asf/activemq/trunk/activemq-unit-tests/src/test/resources/org/apache/activemq/xbean/activemq-policy.xml">example</a>
o
 f this in use:</p><div class="code panel pdl" style="border-width: 1px;"><div
class="codeContent panelContent pdl">
+<div class="wiki-content maincontent"><p>We support a number of different policies
which can be attached to individual destinations (queues, topics) or to wildcards of queue/topic
hierarchies. This makes it easy to configure how different regions of the JMS destination
space are handled.</p><p>The properties you can set on a Destination are as follows:</p><div
class="table-wrap"><table class="confluenceTable"><tbody><tr><th colspan="1"
rowspan="1" class="confluenceTh"><p>Common Property</p></th><th colspan="1"
rowspan="1" class="confluenceTh"><p>Default Value</p></th><th colspan="1"
rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>producerFlowControl</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>If <strong><code>true</code></strong>
the broker will throttle (flow-control) the producer. Throttling is achieved eith
 er by withholding the producer's ACK or by raising a&#160;<strong><code>javax.jms.ResourceAllocationException</code></strong>
(that's propagated back to the client) when local resources e.g., memory and/or storage, have
been exhausted.</p><p>If&#160;<strong><code>false</code></strong>
excess messages will be written to the message store to prevent memory exhaustion. However,
when the message store reaches capacity the producer will be throttled until resources are
freed.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>enableAudit</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>When&#160;<strong><code>true</code></strong>
the broker will track duplicate messages. Duplicates can happen for non-persistent messages
during failover.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>useCache</code></p></td><td
colspan="1" rowspan="1" class="c
 onfluenceTd"><p><code>true</code></p></td><td colspan="1"
rowspan="1" class="confluenceTd"><p>If&#160;<strong><code>true</code></strong>
persistent messages are cached for fast retrieval from store.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>maxPageSize</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>200</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The maximum number of messages to
page in from the store at one time. Increase this value to improve performance for queue destination's
that contain grouped messages that are consumed by multiple concurrent consumers.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>maxBrowsePageSize</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>400</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The maximum number of messages to
page in from the store at one time for a browser.</p></td></tr><tr><td
colspa
 n="1" rowspan="1" class="confluenceTd"><p><code>memoryLimit</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The memory limit (in bytes) of the
destination's cursor.</p><p>This memory limit is subordinate to the system level
memory limit, as specified by the&#160;<a shape="rect" href="producer-flow-control.html"><code>&lt;systemUsage&gt;/&lt;memoryUsage&gt;</code></a>
<span class="confluence-link">attribute</span>. There is no default for this value;
it simply acts as a child to the overall broker memory until the broker memory is exhausted.</p><p><strong>Note</strong>:
when this limit is specified the destination's&#160;<strong><code>cursorMemoryHighWaterMark</code></strong>
will be applied against it and not the&#160;<strong><code>&lt;systemUsage&gt;/&gt;&lt;memoryUsage&gt;</code></strong>
memory limit.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>minimumMes
 sageSize</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>1024</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>For non-serialized messages (embedded
broker) - the assumed size of the message used for memory usage calculation. Serialized messages
use the serialized size as the basis for the memory calculation.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>cursorMemoryHighWaterMark</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>70</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The percentage (%) threshold applied
either to the&#160;<strong><code>&lt;systemUsage&gt;/&lt;memoryUsage&gt;</code></strong>
or the destination's&#160;<strong><code>memoryLimit</code></strong>
(when defined) which when exceeded will cause the destination's cursor to either block or
write to disk.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>storeUsageHighWaterMark</
 code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>100</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The percentage (%) threshold of the&#160;<strong><code>&lt;systemUsage&gt;/&lt;storeUsage&gt;</code></strong>
store limit which when exceeded causes a send to block.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>prioritizedMessages</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Persist message priority information.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>advisoryForConsumed</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message when a message
is consumed by a client.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><code>advisoryForDelivery</code></
 p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message when a message
is sent to a client.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><code>advisoryForSlowConsumers</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message if a consumer
is deemed slow.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>advisoryForFastProducers</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message if a producer
is deemed fast.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>advisoryWhenFull</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspa
 n="1" rowspan="1" class="confluenceTd"><p>Send an advisory message when a limit
(memory, store, temp disk) is full.</p></td></tr><tr><td colspan="1"
rowspan="1" class="confluenceTd"><p><code>includeBodyForAdvisory</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Includes the body of the original
message that triggered the advisory as part of the&#160;<strong><code>dataStructure</code></strong>
field in the advisory message (where applicable). Normally the message body is cleared.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>gcInactiveDestinations</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Garbage collect inactive destinations.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>inactiveTimoutBeforeGC</code></p></td><td
colspan="1" row
 span="1" class="confluenceTd"><p><code>5000</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The timeout (in ms) after which a
destination is considered inactive.</p></td></tr><tr><td colspan="1"
rowspan="1" class="confluenceTd"><p><span><code>usePrefetchExtension</code><br
clear="none"></span></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The prefetch extension is used when
a&#160;message is delivered but not ACK'ed, such that the broker can dispatch&#160;another
message, e.g., <code>prefetch == 0</code>, the idea being that there will always
be prefetch number of messages pending. It also allows a transaction batch to exceed the prefetch&#160;value.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>slowConsumerStrategy</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>null</code></p></td><td
colspan="1" rowspan="1" class="con
 fluenceTd"><p>Sets the strategy for handling slow consumers. See <a shape="rect"
class="external-link" href="http://svn.apache.org/repos/asf/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/policy/AbortSlowConsumerStrategy.java">abortSlowConsumerStrategy.</a></p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>maxDestinations</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>-1</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>(v5.12) If&#160;<strong><code>0</code></strong>
or greater, sets the maximum number of destinations that can be created. This parameter is
intended to limit the number of hierarchical destinations that can be created under a wildcard
destination.</p></td></tr></tbody></table></div><p>Additional
properties for a Queue</p><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th
colspan="1" rowspan="1" class="confluenceTh"><p>Queue only property</p></th><th
col
 span="1" rowspan="1" class="confluenceTh"><p>Default Value</p></th><th
colspan="1" rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>useConsumerPriority</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Use the priority of a consumer when
dispatching messages from a Queue.</p></td></tr><tr><td colspan="1"
rowspan="1" class="confluenceTd"><p><code>strictOrderDispatch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>If&#160;<strong><code>true</code></strong>
queue will not round robin consumers, but it'll use a single one until its prefetch buffer
is full.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>optimizedDispatch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false
 </code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>Don't
use a separate thread for dispatching from a Queue.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>lazyDispatch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Only page in from store the number
of messages that can be dispatched at time.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>consumersBeforeDispatchStarts</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>0</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>When the first consumer connects,
wait for specified number of consumers before message dispatching starts.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>timeBeforeDispatchStarts</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>0</code></p></td><td
colspan="
 1" rowspan="1" class="confluenceTd"><p>When the first consumer connects, wait for
specified time (in ms) before message dispatching starts.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>queuePrefetch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Sets the prefetch for consumers that
are using the default value.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><code>expireMessagesPeriod</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>30000</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The period (in ms) of checks for
message expiry on queued messages, value of 0 disables.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>persistJMSRedelivered</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="c
 onfluenceTd"><p>(v 5.10) If true, before a persistent message is dispatched by the
broker for the first time, the message is rewritten to reflect the possible delivery.</p><p>This
ensures the message&#160;<strong><code>JMSRedelivered</code></strong>
header is a reliable indication of possible duplicate delivery.</p></td></tr></tbody></table></div><p>Additional
properties for a Topic</p><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th
colspan="1" rowspan="1" class="confluenceTh"><p>Topic only property</p></th><th
colspan="1" rowspan="1" class="confluenceTh"><p>Default Value</p></th><th
colspan="1" rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>topicPrefetch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Sets the prefetch for topic consumers
that are using the default value.</p></td></tr><tr><t
 d colspan="1" rowspan="1" class="confluenceTd"><p><code>durableTopicPrefetch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Sets the prefetch for durable topic
consumers that are using the default value.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>advisoryForDiscardingMessages</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory when a message is
discarded from a non durable subscription.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><span style="color: rgb(0,0,0);"><code>alwaysRetroactive</code><br
clear="none"></span></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Makes all subscribers retroactive
negating the need to modify the clien
 ts to enable this feature.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><span style="color: rgb(0,0,0);"><code>expireMessagesPeriod</code><br
clear="none"></span></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>30000</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The interval (in ms) between message
expiration checks on inactive durable subscribers.</p><p><strong>Note</strong>:
set to <strong><code>0</code></strong> to disable message expiration
checking.</p></td></tr></tbody></table></div><p><span
style="line-height: 1.4285715;">The following are examples of different policies that can
be customized on a per destination basis:</span></p><ul><li><a
shape="rect" href="dispatch-policies.html">Dispatch Policies</a></li></ul><p>Here
is an <a shape="rect" class="external-link" href="http://svn.apache.org/repos/asf/activemq/trunk/activemq-unit-tests/src/test/resources/org/apache/activemq/xbean/activemq-policy.xml">example</a>
o
 f this in use:</p><div class="code panel pdl" style="border-width: 1px;"><div
class="codeContent panelContent pdl">
 <pre class="brush: xml; gutter: true; theme: Default" style="font-size:12px;">&lt;beans
xmlns="http://www.springframework.org/schema/beans" 
        xmlns:amq="http://activemq.apache.org/schema/core"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"



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