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interactive session may have just one user Like an interactive session, a session bean is not persistent (That is, its data is not saved to a database) When the client terminates, its session bean appears to terminate and is no longer associated with the client For code samples, see 4
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There are two types of session beans: stateful and stateless
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Stateful Session Beans
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The state of an object consists of the values of its instance variables In a stateful session bean, the instance variables represent the state of a unique client-bean session Because the client interacts ( talks ) with its bean, this state is often called the conversational state The state is retained for the duration of the client-bean session If the client removes the bean or terminates, the session ends and the state disappears This transient nature of the state is not a problem, however, because when the conversation between the client and the bean ends there is no need to retain the state
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Stateless Session Beans
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A stateless session bean does not maintain a conversational state for a particular client When a client invokes the method of a stateless bean, the bean s instance variables may contain a state, but only for the duration of the invocation When the method is finished, the state is no longer retained Except during method invocation, all instances of a stateless bean are equivalent, allowing the EJB container to assign an instance to any client Because stateless session beans can support multiple clients, they can offer better scalability for applications that require large numbers of clients Typically, an application requires fewer stateless session beans than stateful session beans to support the same number of clients At times, the EJB container may write a stateful session bean to secondary storage However, stateless session beans are never written to secondary storage Therefore, stateless beans may offer better performance than stateful beans
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When to Use Session Beans
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In general, you should use a session bean if the following circumstances hold: At any given time, only one client has access to the bean instance The state of the bean is not persistent, existing only for a short period of time (perhaps a few hours) Stateful session beans are appropriate if any of the following conditions are true: The bean s state represents the interaction between the bean and a specific client The bean needs to hold information about the client across method invocations The bean mediates between the client and the other components of the application, presenting a simplified view to the client Behind the scenes, the bean manages the work flow of several enterprise session bean in beans For an example, see the 18 To improve performance, you might choose a stateless session bean if it has any of these traits: The bean s state has no data for a specific client In a single method invocation, the bean performs a generic task for all clients For example, you might use a stateless session bean to send an e-mail that confirms an online order The bean fetches from a database a set of read-only data that is often used by clients Such a bean, for example, could retrieve the table rows that represent the products that are on sale this month
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What Is an Entity Bean
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An entity bean represents a business object in a persistent storage mechanism Some examples of business objects are customers, orders, and products In the J2EE SDK, the persistent storage mechanism is a relational database Typically, each entity bean has an underlying table in a relational database, and each instance of the bean corresponds to a row in that table For code examples of entity beans, please refer to chapters 5 and 6
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