EJB Fundamentals 45 Client Code, Such as Servlets (Free web hosting music)
EJB Fundamentals 45 Client Code, Such as Servlets or Applets EJB Container/Server 3: Return EJB Object Reference 1: Create a New EJB Object Enterprise Beans Home Interface 2: Create EJB Object Home Object EJB Object Remote Interface Figure 2.6 Home interfaces and objects. 1. The client calls a local stub. 2. The stub marshals parameters into a form suitable for the network. 3. The stub sends the parameters over a network connection to the skeleton. 4. The skeleton de-marshals parameters into a form suitable for Java. 5. The skeleton calls the EJB object. 6. The EJB object performs needed middleware, such as connection pooling, transactions, security, and life cycle services. 7. Once the EJB object calls the enterprise bean instance, and the bean does its work, each of the preceding steps must be repeated for the return trip home. Ouch! That s a lot of overhead. Figure 2.4 shows this process. Since version 2.0 of EJB, you can call enterprise beans in a fast, efficient way through their local objects rather than EJB objects. Local objects implement a local interface rather than a remote interface. The local objects are speed demons that enable you to make high-performance enterprise beans. The process works as follows: 1. The client calls a local object. 2. The local object performs needed middleware, such as connection pooling, transactions, security, and life cycle services. 3. Once the enterprise bean instance does its work, it returns control to the local object, which then returns control to the client.
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