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From jaikit <jktsa...@gmail.com>
Subject Discard messages for Slow consumers on "Queue"
Date Tue, 19 Mar 2013 06:00:33 GMT
Hi Docs,

I have running Active MQ 5.8 and have setup VirtualDestinations (2 queues).
One of the queue is slow and it is not discarding messages. Could some one
please suggest how should I enable discarding messages for that queue ?

please find below my code snippet:

        broker.setDeleteAllMessagesOnStartup(true);
        broker.setUseJmx(true);
        broker.setAdvisorySupport(false);
        PolicyMap policyMap = new PolicyMap();
        List<PolicyEntry> entries = new ArrayList<PolicyEntry>();
        PolicyEntry topicPolicy = new PolicyEntry();
        topicPolicy.setTopic(">");
        topicPolicy.setTopicPrefetch(100);
        // topicPolicy.setProducerFlowControl(false);
        entries.add(topicPolicy);

        PolicyEntry queuePolicy = new PolicyEntry();
        // queuePolicy.setProducerFlowControl(false);
        queuePolicy.setQueue(">");

        queuePolicy.setMemoryLimit(100);
        ConstantPendingMessageLimitStrategy
constantPendingMessageLimitStrategy = new
ConstantPendingMessageLimitStrategy();
        constantPendingMessageLimitStrategy.setLimit(1);

       
queuePolicy.setPendingMessageLimitStrategy(constantPendingMessageLimitStrategy);
        OldestMessageEvictionStrategy oldestMessageEvictionStrategy = new
OldestMessageEvictionStrategy();
       
oldestMessageEvictionStrategy.setEvictExpiredMessagesHighWatermark(1);
       
queuePolicy.setMessageEvictionStrategy(oldestMessageEvictionStrategy);
        /* the period (in ms) of checks for message expiry on queued
messages, value of 0 disables */
        queuePolicy.setExpireMessagesPeriod(1000);
        /* Set the PrefetchSize for all topics. You can override this value
while creating consumer. */
        // policy.setTopicPrefetch(10);
        queuePolicy.setQueuePrefetch(10);
        entries.add(queuePolicy);
        policyMap.setPolicyEntries(entries);
        broker.setDestinationPolicy(policyMap);

        /* All undeliverable messages will be sent to ActiveMQ.DLQ which has
fixed size. If it reaches fixed size,
         * producers will be throttled. Drop dead letter queue. Enable it
case by case basis. */
        DiscardingDLQBrokerPlugin dlqBrokerPlugin = new
DiscardingDLQBrokerPlugin();
        dlqBrokerPlugin.setDropAll(true);
        dlqBrokerPlugin.setDropTemporaryTopics(true);
        dlqBrokerPlugin.setDropTemporaryQueues(true);
        BrokerPlugin[] plugins = { dlqBrokerPlugin };
        broker.setPlugins(plugins);

        VirtualTopic virtualTopic = new VirtualTopic();
        // the new config that enables selectors on the intercepter
        virtualTopic.setSelectorAware(true);
        VirtualDestinationInterceptor interceptor = new
VirtualDestinationInterceptor();
        interceptor.setVirtualDestinations(new VirtualDestination[] {
virtualTopic });
        broker.setDestinationInterceptors(new DestinationInterceptor[] {
interceptor });
        broker.start();



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