Message-Driven Bean

What is Message-Driven Bean?

Definition and meaning of Message-Driven Bean

A message-pushed bean is a part of a light-Weight Enterprise Software this is used to technique messages in Asynchronous Mode, in which the user does now not always receive imMediate consequences. Any issue can send those messages irrespective of whether it uses J2EE technology.

The awesome Functions that differentiate message-pushed beans from Session and Entity Beans are that message-pushed beans can not be Accessed through Interfaces and they have handiest a bean elegance.

What Does Message-Driven Bean Mean?

Message beans also are referred to for the following Characteristics:

• Message-driven beans’ Instances maintain no facts or conversational nation for a particular patron.
• All instances of a message-driven bean are equivalent, allowing the EJB Field to assign a message to any message-pushed bean example. The field can pool these times to allow streams of messages to be processed conCurrently.
• A unmarried message-pushed bean can Method messages from more than one customers.

Message-pushed beans are used in aSynchronous communique among Business enterprise utility Components. A message is processed as follows:

1. When a brand new message arrives, the corporation JavaBeans box calls the message-driven bean’s onMessage method to method the message.
2. The message is forged as a JMS message, that's dealt with based on the application’s business common sense. Then, if the onMessage approach desires to method the message simplest, it invokes a Session Bean. If, however, the approach wants to save the message in a Database, it invokes an Entity bean.
3. The message is then added to a message-driven bean so that the above operations become part of a single and complete Transaction. A message is every so often redelivered if there is a Rollback in message processing.

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