3.7. Principle of operation: message-driven EJBs
Figure 3.7 shows the basic principle of operation of a message-driven EJB.
Figure 3.7. Basic principle of operation of a message-driven EJB.
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The EJB container initializes a pool of instances of the EJB’s implementation class.
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The client looks up the queue or topic to which the desired EJB is listening.
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The client posts messages to this queue or topic.
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The messaging service supplies the messages to the EJB container.
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The container calls the implementation’s onMessage() method.
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