Java Composite entity Mode ~

The combined entity pattern is used for the EJB persistence mechanism. A composite entity is an EJB entity bean that represents an object graph. When a composite entity is updated, the internal dependency object Bean is automatically updated to be managed by the EJB entity Bean. The following are the participants in the composite entity bean.

• Composite Entities -it is the primary entity bean. It can be coarse-grained or can contain coarse-grained objects for persistence purposes.

• coarse-Grained object -This object contains dependent objects. It has its own life cycle and manages the life cycle of the dependent objects.

• Dependent object -a dependent object is an object, depending on its persistent life-cycle coarse-grained object.

• Policy -policy represents how to implement complex composite entities.

Implementing an instance

In the example of this implementation, the object is created CompositeEntity as a CompositeEntity . CoarseGrainedObjectis a class that contains dependent objects. CompositeEntityPatternDemois a demo class that uses Client classes to demonstrate the use of composite entity patterns.

The structure of the composite entity pattern example is as shown in-

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Java Composite entity Mode ~