{"id":24398,"date":"2014-04-23T19:00:59","date_gmt":"2014-04-23T16:00:59","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?p=24398"},"modified":"2014-04-23T10:46:44","modified_gmt":"2014-04-23T07:46:44","slug":"activemq-network-of-brokers-explained-part-2","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2014\/04\/activemq-network-of-brokers-explained-part-2.html","title":{"rendered":"ActiveMQ – Network of Brokers Explained – Part 2"},"content":{"rendered":"

In this blog we will see how\u00a0duplex network connectors<\/b>\u00a0work.<\/p>\n

In the previous\u00a0part 1<\/a>\u00a0we created a network connector from broker-1 and broker-2. We were able to see how messages for queue “foo.bar” on broker-1 were forwarded queue “foo.bar” on broker-2 when there was a consumer on broker-2 for queue “foo.bar”<\/p>\n

Let’s try doing the reverse by producing messages into broker-2’s queue foo.bar and consume from broker-1’s queue “foo.bar”<\/p>\n

 <\/p>\n

Ashwinis-MacBook-Pro:example akuntamukkala$\u00a0ant producer -Durl=tcp:\/\/localhost:61626 -Dtopic=false -Ddurable=true -Dsubject=foo.bar -Dmax=100<\/pre>\n
Ashwinis-MacBook-Pro:example akuntamukkala$\u00a0ant consumer -Durl=tcp:\/\/localhost:61616 -Dtopic=false -Dsubject=foo.bar<\/pre>\n
\"broker-2-100-msg-enqueue\"<\/a><\/p>\n
In the previous blog post, we had enqueued\/dequeued 100 messages. Hence the #messages enqueued now shows as 200 here.<\/p>\n
As shown above, 100 new messages are enqueued on foo.bar queue on broker-2 but there are no consumers though there is a network connector for all queues from broker-1 to broker-2.<\/p>\n
\n
The reason is that a network connector unless specified as “duplex” is unidirectional from the source to the destination broker.\u00a0<\/p>\n<\/blockquote>\n
Let’s change the following attribute highlighted in yellow in <\/p>\n
 \/Users\/akuntamukkala\/apache-activemq- 5.8.0\/bridge-demo\/broker-1\/conf\/activemq.xml<\/pre>\n
 configuration file for broker-1.<\/p>\n
 <networkConnectors>\r\n         <networkConnector \r\n            name=\"T:broker1->broker2\" \r\n            uri=\"static:(tcp:\/\/localhost:61626)\" \r\n            duplex=\"false\" \r\n            decreaseNetworkConsumerPriority=\"true\" \r\n            networkTTL=\"2\" \r\n            dynamicOnly=\"true\">\r\n            <excludedDestinations>\r\n                  <queue physicalName=\">\" \/>\r\n            <\/excludedDestinations>\r\n         <\/networkConnector>\r\n         <networkConnector \r\n            name=\"Q:broker1->broker2\" \r\n            uri=\"static:(tcp:\/\/localhost:61626)\" \r\n            duplex=\"true\" \r\n            decreaseNetworkConsumerPriority=\"true\" \r\n            networkTTL=\"2\" \r\n            dynamicOnly=\"true\">\r\n            <excludedDestinations>\r\n                  <topic physicalName=\">\" \/>\r\n            <\/excludedDestinations>\r\n         <\/networkConnector>\r\n     <\/networkConnectors><\/pre>\n
Let’s restart the brokers and connect to the brokers using jConsole.
 
<\/div> <\/div><\/p>\n
Here is broker-1 jConsole MBean tab screenshot which shows the following:<\/p>\n
    \n
  1. Q:broker1->broker2 network connector is duplex.<\/li>\n
  2. There is now a dynamic producer into broker-1 from broker-2 because the
    \nQ:broker1->broker2 network connector is “duplex”.<\/li>\n<\/ol>\n
    \"broker-1-jconsole\"<\/a><\/p>\n
    Here is broker-2 jConsole MBean tab screenshot which shows the following:<\/p>\n
      \n
    1. Duplex network connector from broker-2 to broker-1<\/li>\n
    2. Two dynamic message producers from broker-1 to broker-2\n
        \n
      1. Please note that “Q:broker1->broker2” network connector shows as duplex as configured in activemq.xml<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n
        \"broker-2-jconsole\"<\/a><\/p>\n
        Let’s see this in action<\/h2>\n
          \n
        1. Producer 100 messages into broker-2<\/li>\n
          Ashwinis-MacBook-Pro:example akuntamukkala$\u00a0ant producer -Durl=tcp:\/\/localhost:61626 -Dtopic=false -Ddurable=true -Dsubject=foo.bar -Dmax=100<\/pre>\n
          Screenshot of queues in broker-2: http:\/\/localhost:9161\/admin\/queues.jsp<\/p>\n
          \"broker-2-duplex-noconsumers\"<\/a><\/p>\n
        2. Create a consumer on foo.bar on broker-1<\/li>\n
          Ashwinis-MacBook-Pro:example akuntamukkala$\u00a0ant consumer -Durl=tcp:\/\/localhost:61616 -Dtopic=false -Dsubject=foo.bar<\/pre>\n
          The following screenshot from broker-2 shows that all the 100 messages have been dequeued by a consumer (dynamically forwarded to broker-1).<\/p>\n
          http:\/\/localhost:9161\/admin\/queues.jsp<\/p>\n
          \"broker-2-duplex-msg-dequeued\"<\/a><\/p>\n
          The following screenshot shows the details of this dynamic consumer on broker-2’s foo.bar queue.<\/p>\n
          http:\/\/localhost:9161\/admin\/queueConsumers.jsp?JMSDestination=foo.bar<\/p>\n
          \"broker-2-duplex-dynamicconsumer\"<\/a><\/p>\n
          The following screenshot shows that the 100 messages which were dynamically moved from broker-2’s foo.bar queue to broker-1’s foo.bar queue have been successfully consumed by the consumer which we created in step #2<\/p>\n
          \"broker-1-duplex-msg-consumed\"<\/a><\/p>\n
          This concludes part 2 of this series where we saw how duplex network connectors work.<\/p>\n
          As always your comments are very welcome.<\/p>\n
          Stay tuned for part 3 where we will go over load balancing consumers on local\/remote brokers…<\/p>\n
          \n\n\n\n
          Reference: <\/span><\/td>\nActiveMQ – Network of Brokers Explained – Part 2<\/a> from our JCG partner<\/a> Ashwini Kuntamukkala at the Ashwini Kuntamukkala – Technology Enthusiast<\/a> blog.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
          In this blog we will see how\u00a0duplex network connectors\u00a0work. In the previous\u00a0part 1\u00a0we created a network connector from broker-1 and broker-2. We were able to see how messages for queue “foo.bar” on broker-1 were forwarded queue “foo.bar” on broker-2 when there was a consumer on broker-2 for queue “foo.bar” Let’s try doing the reverse by …<\/p>\n","protected":false},"author":547,"featured_media":48,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[173,59],"class_list":["post-24398","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-apache-activemq","tag-jms"],"yoast_head":"\nActiveMQ - Network of Brokers Explained - Part 2<\/title>\n<meta name=\"description\" content=\"In this blog we will see how\u00a0duplex network connectors\u00a0work. 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