Question

使用Stomp WebSockets连接到ActiveMQ服务器，我的extjs5浏览器webapp有很多主题订阅作用于面板。

以下是带标题的主题订阅示例：

var sub = this.mqClient.subscribe('/topic/Status', this.onStatusMsg, 
{"ack":"auto","persistent":true,"activemq.retroactive":true,"selector":"TaskId = 1531","activemq.subscriptionName":"status-1531"} );

当用户完成主题订阅后，她会关闭触发this.mqClient.unsubscribe（sub）调用的面板。

重新打开该面板会创建一个具有相同activemq.subscriptionName的订阅，该订阅会触发此错误响应：

javax.jms.JMSException: Durable consumer is in use for client: 2015-05-28 15:29:32-0700.0.9276173142716289 and subscriptionName: status-1531
    at org.apache.activemq.broker.region.TopicRegion.addConsumer(TopicRegion.java:127)
    at org.apache.activemq.broker.region.RegionBroker.addConsumer(RegionBroker.java:427)
    at org.apache.activemq.broker.jmx.ManagedRegionBroker.addConsumer(ManagedRegionBroker.java:244)
    at org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:102)
    at org.apache.activemq.advisory.AdvisoryBroker.addConsumer(AdvisoryBroker.java:104)
    at org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:102)
    at org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:102)
    at org.apache.activemq.broker.MutableBrokerFilter.addConsumer(MutableBrokerFilter.java:107)
    at org.apache.activemq.broker.TransportConnection.processAddConsumer(TransportConnection.java:667)
    at org.apache.activemq.command.ConsumerInfo.visit(ConsumerInfo.java:348)
    at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:335)
    at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:189)
    at org.apache.activemq.transport.AbstractInactivityMonitor.onCommand(AbstractInactivityMonitor.java:270)
    at org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:83)
    at org.apache.activemq.transport.ws.jetty8.StompSocket.sendToActiveMQ(StompSocket.java:125)
    at org.apache.activemq.transport.stomp.ProtocolConverter.sendToActiveMQ(ProtocolConverter.java:199)
    at org.apache.activemq.transport.stomp.ProtocolConverter.onStompSubscribe(ProtocolConverter.java:663)
    at org.apache.activemq.transport.stomp.ProtocolConverter.onStompCommand(ProtocolConverter.java:257)
    at org.apache.activemq.transport.ws.jetty8.StompSocket.onMessage(StompSocket.java:82)
    at org.eclipse.jetty.websocket.WebSocketConnectionRFC6455$WSFrameHandler.onFrame(WebSocketConnectionRFC6455.java:850)
    at org.eclipse.jetty.websocket.WebSocketParserRFC6455.parseNext(WebSocketParserRFC6455.java:349)
    at org.eclipse.jetty.websocket.WebSocketConnectionRFC6455.handle(WebSocketConnectionRFC6455.java:225)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
    at java.lang.Thread.run(Thread.java:745)

如何关闭持久主题订阅？

Answer 1

如果订阅当前处于活动状态（意味着订户已连接并且当前订阅），则在STOMP中删除持久订阅是一个两步过程。

首先，客户必须取消订阅才能使订阅变为非活动状态：

String frame = "UNSUBSCRIBE\n" + "destination:/topic/MyTopic" + "\n\n" + Stomp.NULL;

现在订阅处于非活动状态，可以通过发布取消订阅最终用于创建订阅的订阅名称来永久删除订阅：

String frame = "UNSUBSCRIBE\n" + "destination:/topic/MyTopic" + "\n" + "activemq.subscriptionName:MySubscriptionName\n\n" + Stomp.NULL;

这将删除订阅以及它从ActiveMQ消息存储中保存的所有存储消息。

如何取消订阅持久主题订阅

1 个答案: