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2012-01-09T19:41:38.280
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The virtual topics feature is very simple and quite powerful once you understand it. <ol> <li>When using virtual topics - there is no need for durable consumers. That is because for each client you will get an instance of regular queue created. If you have 5 clients (application A, B, C, D, E) you will get 5 queues created and populated with the copy of the messages every time message is sent to the virtual topic.</li> <li>Actually it is a limitation of durable consumer - that only ONE connection is allowed per clientId. Being a regular queue, you can create as many consumers as you like and queue will guarantee that 1 message will be received only by 1 consumer. So if you have application A that takes 1 minute to process a message, you can create 5 instances of it listening to the same queue. When you will post 5 messages within 1 second, each of your application will receive its own message to process.</li> <li>There are not well documented requirements which are not intuitive. To make virtual topic work you need <ul> <li>Use <code>VirtualTopic.</code> in your topic name, for example <code>VirtualTopic.Orders</code> (this prefix can be configured)</li> <li>Use <code>Consumer.</code> in the name of the queue you. Like <code>Consumer.ApplicationA.VirtualTopic.Orders</code> where ApplicationA is actually your client id</li> <li>Use regular subscribers not durable ones for the queue above.</li> </ul></li> </ol> Example: <pre><code>string activeMqConsumerTopic = "Consumer.AmqTestConsumer.VirtualTopic.Orders"; IQueue queue = SessionUtil.GetQueue(session, activeMqConsumerTopic); IMessageConsumer consumer = session.CreateConsumer(queue); </code></pre> Queue is created for automatically whenever the first instance of consumer is subscribed to it. Since that moment all messages that are sent to topic are duplicated/copied into all associated queues. Hope this helps.
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1. POhow to create multiple instances of activemq topic subscribers using virtual destinations?
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