Figure 3 5 Life Cycle of an Entity Bean in Java

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Figure 3 5 Life Cycle of an Entity Bean
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THE LIFE CYCLES OF ENTERPRISE BEANS
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In the pooled state, an instance is not associated with any particular EJB object identity With bean-managed persistence, when the EJB container moves an instance from the pooled state to the ready state, it does not automatically set the primary key Therefore, the and methods must set the primary key If the primary key is incorrect, the and methods cannot synchronize the instance variables with the database In the The SavingsAccountEJB Example, page (84), the method assigns the primary key from one of the input parameters The method sets the primary key ( ) as follows:
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In the pooled state, the values of the instance variables are not needed You can make these instance variables eligible for garbage collection by setting them to in the method
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The Life Cycle of a Message-Driven Bean
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Figure 3 6 illustrates the stages in the life cycle of a message-driven bean
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Figure 3 6 Life Cycle of a Message-Driven Bean
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ENTERPRISE BEANS
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The EJB container usually creates a pool of message-driven bean instances For each instance, the EJB container instantiates the bean and performs these tasks:
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1 It calls the to the instance 2 It calls the instance s
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method to pass the context object
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Like a stateless session bean, a message-driven bean is never passivated, and it has only two states: nonexistent and ready to receive messages
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At the end of the life cycle, the container calls the bean s instance is then ready for garbage collection
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4 A Session Bean Example
Dale Green
SESSION beans are powerful because they extend the reach of your clients into
remote servers yet they re easy to build In 2, you built a stateless ses This chapter examines the source code of a sion bean named stateful session bean called
In This
The CartEJB Example 70 Session Bean Class 70 Home Interface 75 Remote Interface 76 Helper Classes 76 Running the CartEJB Example 76 Other Enterprise Bean Features 78 Accessing Environment Entries 78 Comparing Enterprise Beans 80 Passing an Enterprise Bean s Object Reference 80
BJ Et r aC B JE r et re v no C
A SESSION BEAN EXAMPLE
The CartEJB Example
The session bean represents a shopping cart in an online bookstore The bean s client may add a book to the cart, remove a book, or retrieve the cart s contents To construct , you need the following code:
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All session beans require a session bean class All enterprise beans that permit remote access must have a home and remote interface To meet the needs of a specific application, an enterprise bean may also need some helper classes The session bean uses two helper classes, and , which are discussed in the section Helper Classes, page (76)
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