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Stateful session beans are guaranteed to maintain conversational state. They are not programmatically very different from their stateless cousins: as a matter of fact, the only real difference between stateless and stateful beans is how the container manages their lifecycle. Unlike with stateless beans, the container makes sure that subsequent method invocations by the same client are handled by the same stateful bean instance. Figure 3.6 shows the one-to-one mapping between a bean instance and a client enforced behind the scenes by the container. As far as you are concerned, this one-to-one relation management happens automagically. The one-to-one mapping between a client and a bean instance makes saving bean conversational state in a useful manner possible. However, this one-to-one correlation comes at a price. Bean instances cannot be readily returned to the pool and reused while a client session is still active. Instead, a bean instance must be squirreled away in memory to wait for the next request from the client owning the session. As a result, stateful session bean instances held by a large number of concurrent clients can have a significant memory footprint. An optimization technique called passivation, which we ll discuss soon, is used to alleviate this problem. Stateful session beans are ideal for multistep, workflow-oriented business processes. In this section, we explore stateful beans by using the ActionBazaar bidder account creation workflow as an example.

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Figure 3.6 Stateful bean session maintenance. There is a bean instance reserved for a client and each instance stores the client s state information. The bean instance exists until either removed by the client or timed out.

We describe a use case of our ActionBazaar application and implement it using a stateful session bean. We show you additional programming rules for stateful session beans, and then we examine stateful bean lifecycle callback methods and the @Remove annotation. Finally, we summarize differences between stateless and stateful session beans. However, before we jump into code, let s briefly examine the rules specific to developing a stateful session bean.

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When a managed array is created, the data for all elements is implicitly set to zero values, and the default constructor if available is called. This behavior differs from the initialization of native arrays. To initialize a native array, the default constructor would be called for every single argument. If no constructor is present, the native array s data is not initialized. Initializing a managed array with zero values first and then calling a potential default constructor sounds like an overhead. However, in most cases, there is no default constructor that could be called. None of the public value types from the FCL has a default constructor. To

3.3.1 Additional programming rules In section 3.1.3, we discussed the programming rules that apply to all session beans. Stateful session beans have a few minor twists on these rules:

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The sample solution that is presented here shows you how to secure an application using the UsernameForCertificate assertion. Figure 6-6 shows the Solution Explorer window for the Visual Studio .NET solution that we will use in this chapter. It is based on the StockTrader application presented in s 3 and 4 and includes the following: A Web service called StockTraderSecure, which provides methods for requesting stock quotes and executing trades. A client console application called StockTraderClient, which invokes the StockTrader Web service via a proxy class. A reference assembly called StockTraderTypes, which provides code definitions for the custom types that are used by the StockTrader Web service. (The source project is included in this chapter s solution for clarity. However, future chapter projects will simply reference the compiled StockTraderTypes assembly instead.) The type definitions are contained in a separate assembly in order to be accessible to any application that wants to interact with the StockTrader Web service. (Recall that these custom types are based on the StockTrader XSD schema, which is presented in 3.)

Stateful bean instance variables used to store conversational state must be Java primitives or Serializable objects. We ll talk more about this requirement when we cover passivation. Since stateful session beans cannot be pooled and reused like stateless beans, there is a real danger of accumulating too many of them if we don t have a way to destroy them. Therefore, we have to define a business method for removing the bean instance by the client using the @Remove annotation. We ll talk more about this annotation soon. In addition to the PostConstruct and PreDestroy lifecycle callback methods, stateful session beans have the PrePassivate and PostActivate lifecycle callback methods. A PrePassivate method is invoked before a stateful bean instance is passivated and PostActivate is invoked after a bean instance is brought back into the memory and is method ready.

You ll see these rules applied when we explore a concrete stateful session beans example next. As we did for stateless beans, we ll utilize the example as a jumping-off point to detail stateful features.

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