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State the Benefits and Costs of Container-Managed Persistence
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One of the evolving aspects of the entity bean is its persistence. Before this persistence can be meaningful, you need to understand the details of developing entity beans. Here, you will learn about the uses of entity beans, the entity bean life cycle states, and the steps involved in developing entity beans. You will take a close look at developing entity beans and review how to manage persistence. You ll also learn the benefits and drawbacks of both CMP and BMP.
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Managing Persistence (Prior to EJB 3.0)
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Bean persistence can be managed in two ways: You can let the container manage the persistence of the bean via container-managed persistence (CMP), or you can use bean-managed persistence (BMP). This method requires that the developer implement the interaction code between the EJB and the persistence engine. This is a much more complicated task than opting for the first option. This mode should not be seen as a standard development model, but more as a means to get to and implement the lower level persistence mechanism. In other words, use BMP only
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State the Bene ts and Costs of Container-Managed Persistence
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when the limits of CMP have been exceeded. It is not realistic to consider using this far more complicated model for every EJB that you need to build. The CMP model should be considered as the general persistence model for most of an application s development. When the container handles the overhead necessary to support a bean in a manner that is satisfactory to the enterprise bean provider, it stands to reason that more of the enterprise bean provider s development efforts can be focused on actually writing business logic. However, if the CMP engine provided with the Application Server at hand is not sufficient and there are no available resources to implement BMP and there is already so much commitment to the current Application Server that changing Application Servers is not an option, then integrating a third-party CMP engine with the current Application Server is another option that may be considered. Even though being able to plug-in a third-party CMP engine into an Application Server is not part of the Java EE specification, certain Application Servers will allow the integration of certain third-party CMP engines. This ability of should be considered when deciding which Application Server is to be used for a project.
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In CMP, entity bean data is maintained automatically by the container that uses the mechanism of its choosing. For example, a container implemented on top of a RDBMS may manage persistence by storing each bean s data as a row in a table. The container may also use the Java programming language serialization functionality for persistence. When a programmer chooses to utilize CMP beans, the programmer specifies which fields are to be retained. A persistence manager is used to separate the management of bean relationships from the container. With this separation, a container has the responsibility for managing security, transactions, and so on, while the persistence manager is able to manage different databases via different containers. Using this architecture allows entity beans to become more portable across EJB vendors. Entity beans are mapped to the database using a bean-persistence manager contract called the abstract persistence schema. The persistence manager is responsible for implementing and executing find methods based on EJB QL. The persistence manager generates a mapping of CMP objects to a persistent data store s objects based on the information provided by the deployment descriptor, the bean s abstract persistence schema, and settings set by the deployer. Persistent data stores may include relational databases, flat files, Enterprise Resource Planning (ERP) systems, and so on.
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7: Enterprise JavaBeans and the EJB Container Model
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A contract between the CMP entity bean and the persistence manager allows for defining complex and portable bean-to-bean, bean-to-dependent, and even dependentto-dependent object relationships within an entity bean. For the persistence manager to be separated from the container, a contract between the bean and the persistence manager is defined. When EJB is deployed, the persistence manager is used to generate an instantiated implementation of the EJB class and its dependent object classes. It does this based on its XML deployment descriptor and the bean class. The instantiated implementation will include the data access code that will read and write the state of the EJB to the database at runtime. When this happens, the container uses the subclasses generated by the persistence manager instead of the EJBs abstract classes defined by the bean provider. The persistence manager of the EJB container is also used to manage the persistence of the bean state or data. As previously mentioned, the enterprise bean provider in this scenario is able to concentrate on implementing business logic with Java code. A bean using CMP is simpler than one that uses BMP; however, it is also dependent on a container for database access. Using CMP, the EJB container is responsible for saving the bean s state. Because the persistence process is container managed, the Java code used to retrieve and store data is independent of the data source. On the other hand, the containermanaged fields do need to be specified in the deployment descriptor file so the EJB container s persistence manager can automatically handle the persistence process. Some benefits and drawbacks of CMP are detailed next.
CMP Pros Benefits of container-managed persistence include the following:
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