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Advanced Features

JMSPool

• JMSPool is an advanced JMS instance that allow multiple threading messaging for incoming and outgoing messages. It is built on Java 5 concurrency library and also utilize the ActiveMQ Pooled Connection Factory.
• For simple JMS usage,
  • a new connection and session are created on every JMS execution block. Resources are closed after usage.
  • user has to manage threads and concurrency. Without special coding, messages are sent and received in a single connection and session. 
• The currently JMSPool is fairly simple. It does not support features like transaction, connection recovery etc. If you need a full feature JMS Pooling product, you are highly recommended to use Spring JMS or Jencks.
• With JMSPool
  • You could use a JMSPool intance with multiple threads for incoming and outgoing messaging
  • The threads are managed by Java 5 ThreadExecutor
  • Each thread uses a JMS instance
• Diagrams
  • JMSPool works differently in different scenarios
  • For outgoing messages to Queue or Topic, it works like the following diagram
    • Without the pool, multiple clients will have to send message in a serial manner. The JMSPool supports clients from multiple threads to send message concurrently. When there are more concurrent message than worker threads, the messages will be put on a an internal buffer.
    • Worker threads are spawn to handle connection in parallel, each thread makes a connection to the JMS server.