Question

我正在使用activeMQ 5.3通过blazeds 3.2向Flex客户端发送消息。

当客户端第一次连接时，我可以看到正在进行的activeMQ代理订阅。但是，在我终止运行客户端的浏览器之后，即使没有消息被消耗，订阅仍保持打开状态。这最终导致Web服务器的内存不足。从日志中看起来Blazeds取消了订阅源。

当没有客户连接时，不应该停止订阅，为什么他不这样做？

您可以在下面找到日志文件中的代码段。

...
STARTING WEB SERVER
...
14 Dec 2009 15:54:59,015 [main] DEBUG activemq.transport.vm.VMTransportFactory  - binding to broker: localhost
14 Dec 2009 15:54:59,031 [main] INFO  apache.activemq.broker.TransportConnector  - Connector vm://localhost Started
14 Dec 2009 15:54:59,031 [main] INFO  apache.activemq.broker.BrokerService  - ActiveMQ JMS Message Broker (localhost, ID:pcjbe-2026-1260802498843-0:0) started
...
CONNECTING WITH CLIENT
...
14 Dec 2009 15:55:03,953 [VMTransport] DEBUG apache.activemq.broker.TransportConnection  - Setting up new connection: vm://localhost#4
14 Dec 2009 15:55:03,968 [VMTransport] DEBUG activemq.broker.region.AbstractRegion  - localhost adding consumer: ID:pcjbe-2026-1260802498843-2:2:-1:1 for destination: topic://ActiveMQ.Advisory.TempQueue,topic://ActiveMQ.Advisory.TempTopic
14 Dec 2009 15:55:03,968 [http-8000-3] INFO  flex.messaging.jms.JmsAdapter  - client [AEE95CCE-816B-EBCC-2ACE-41508E3338AC] subscribed to destination [detectorsFeed]
14 Dec 2009 15:55:03,968 [VMTransport] DEBUG activemq.broker.region.AbstractRegion  - localhost adding consumer: ID:pcjbe-2026-1260802498843-2:2:1:1 for destination: topic://tmsng.topic.detectors
14 Dec 2009 15:55:03,968 [VMTransport] DEBUG activemq.broker.region.AbstractRegion  - localhost adding destination: topic://tmsng.topic.detectors
14 Dec 2009 15:55:03,968 [VMTransport] DEBUG activemq.broker.region.AbstractRegion  - localhost adding destination: topic://tmsng.topic.detectors
14 Dec 2009 15:55:03,968 [VMTransport] DEBUG activemq.broker.region.AbstractRegion  - localhost adding destination: topic://ActiveMQ.Advisory.Consumer.Topic.tmsng.topic.detectors
[BlazeDS]12/14/2009 15:55:03.968 [DEBUG] [Client.MessageClient] MessageClient created with clientId 'AEE95CCE-816B-EBCC-2ACE-41508E3338AC' for destination 'detectorsFeed'.
...
DISCONNECTING CLIENT
...
14 Dec 2009 15:58:55,156 [http-8000-8] INFO  flex.messaging.jms.JmsAdapter  - client [AEF0AC64-7B6C-2749-8860-252B8A302EBA] unsubscribed from destination [detectorsFeed]
[BlazeDS]12/14/2009 15:58:55.156 [DEBUG] [Client.MessageClient] MessageClient with clientId 'AEF0AC64-7B6C-2749-8860-252B8A302EBA' for destination 'detectorsFeed' has been invalidated.

您可以在下面找到用于ActiveMQ的配置

<beans xmlns="http://www.springframework.org/schema/beans" ...>

<amq:broker brokerName="localhost" useJmx="true" persistent="false" dataDirectory="${INSTALLDIR}/var" >
    <amq:destinationPolicy>
        <amq:policyMap>
            <amq:policyEntries>
                <amq:policyEntry topic=">" producerFlowControl="false">
                    <amq:pendingSubscriberPolicy>
                        <amq:vmCursor/>
                    </amq:pendingSubscriberPolicy>
                </amq:policyEntry>
            </amq:policyEntries>
        </amq:policyMap>
    </amq:destinationPolicy>

    <amq:managementContext>
        <amq:managementContext createConnector="false"/>
    </amq:managementContext>

    <amq:systemUsage>
        <amq:systemUsage sendFailIfNoSpace="true">
            <amq:memoryUsage>
                <amq:memoryUsage limit="10mb" />
            </amq:memoryUsage>
        </amq:systemUsage>
    </amq:systemUsage>

    <amq:transportConnectors>
        <amq:transportConnector uri="vm://localhost" />
    </amq:transportConnectors>
</amq:broker>

<!-- JMS ConnectionFactory to use, configuring the embedded broker using XML -->
<amq:connectionFactory id="connectionFactory" brokerURL="vm://localhost" alwaysSessionAsync="true">
    <amq:prefetchPolicy>
        <!-- For pooled connections, set the prefetch to 1 to avoid out-of-order messages. (see http://activemq.apache.org/what-is-the-prefetch-limit-for.html) -->
        <amq:prefetchPolicy all="1"/>   
    </amq:prefetchPolicy>
</amq:connectionFactory>

<!-- a pooling based JMS provider -->
<bean id="jmsFactory" class="org.apache.activemq.pool.PooledConnectionFactory" destroy-method="stop">
    <property name="connectionFactory" ref="connectionFactory" />
</bean>

<amq:topic id="detectorTopic" physicalName="tmsng.topic.detectors" />

祝你好运扬

Answer 1

看起来像是没有关闭连接的blazeds问题

当Flex客户端断开连接时，ActiveMQ不会停止订阅

1 个答案: