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What is Composite Entity pattern?

Answer»

Composite Entity pattern is used in EJB persistence mechanism. A Composite entity is an EJB entity bean which represents a graph of objects. When a composite entity is updated, internally dependent objects beans get updated automatically as being managed by EJB entity bean. Following are the participants in Composite Entity Bean.

  • Composite Entity - It is primary entity bean. It can be coarse grained or can contain a coarse grained object to be used for persistence purpose.

  • Coarse-Grained Object - This object contains dependent objects. It has its own life cycle and also manages life cycle of dependent objects.

  • Dependent Object - Dependent object is an object which depends on coarse grained object for its persistence lifecycle.

  • Strategies - Strategies represents how to implement a Composite Entity.


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