ActiveMQ-删除不活动的队列（Delete Inactive Destinations）
<broker xmlns="http://activemq.apache.org/schema/core" schedulePeriodForDestinationPurge="10000"> <destinationPolicy> <policyMap> <policyEntries> <policyEntry queue=">" gcInactiveDestinations="true" inactiveTimoutBeforeGC="30000"/> </policyEntries> </policyMap> </destinationPolicy> </broker>
schedulePeriodForDestinationPurge：10000 ?每十秒检查一次，默认为0，此功能关闭
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gcInactiveDestinations： true ?删除掉不活动队列，默认为false
inactiveTimoutBeforeGC：30000 不活动30秒后删除，默认为60秒
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修改后的完整xml如下：
<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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd"> <bean schedulePeriodForDestinationPurge="10000" brokerName="localhost" dataDirectory="${activemq.data}"> <destinationPolicy> <policyMap> <policyEntries> <policyEntry topic=">" producerFlowControl="true" memoryLimit="1mb"> <pendingSubscriberPolicy> <vmCursor /> </pendingSubscriberPolicy> </policyEntry> <policyEntry queue=">" producerFlowControl="true" memoryLimit="1mb"> </policyEntry><policyEntry queue=">" gcInactiveDestinations="true" inactiveTimoutBeforeGC="30000"/> </policyEntries> </policyMap> </destinationPolicy> <managementContext> <managementContext createConnector="false"/> </managementContext> <persistenceAdapter> <kahaDB directory="${activemq.data}/kahadb"/> </persistenceAdapter> <systemUsage> <systemUsage> <memoryUsage> <memoryUsage limit="64 mb"/> </memoryUsage> <storeUsage> <storeUsage limit="100 gb"/> </storeUsage> <tempUsage> <tempUsage limit="50 gb"/> </tempUsage> </systemUsage> </systemUsage> <transportConnectors> <transportConnector name="openwire" uri="tcp://0.0.0.0:61616"/> </transportConnectors> </broker> <import resource="jetty.xml"/></beans>?
由于ActiveMQ使用时自动创建Destination，并且默认情况下不会删除掉，这种只增加不减少，导致在queue创建频繁的情况下，本功能非常有用。
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