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APPENDIX B
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You could map an entity bean to each table. The individual entity bean instances map one-to-one to the table rows. The entity bean logic maps the fields in the persistent store with methods in a Java interface. Entity beans come in two flavors, those using BMP and those using CMP. The developer is responsible for the persistence logic in a BMP entity bean. For example, if a relational database backs a BMP entity bean, the bean developer implements the SQL for creating objects, accessing an object s fields and querying for objects. The EJB container automatically manages the persistence logic for CMP entity beans. Although CMP has its limitations, it is a rapidly maturing technology. If possible, CMP is definitely the advisable road to take. First, CMP abstracts the persistence details from the entity bean. A CMP entity bean user can reconfigure a bean backed by a relational database to use an object-oriented database without modifying even the entity bean logic not to mention the business logic that uses the entity bean. CMP also gives the container more control over the persistence details, increasing its ability to optimize updates and cache data. Many application server vendors even provide functionality to automatically set up the database tables based on CMP entity beans. Processing asynchronous messages with message-driven beans JMS provides a framework for asynchronous message passing. Whereas a normal method call blocks until the processing finishes, JMS enables you to fire off a message and immediately go about your business without waiting for a return value. A JMS-based system consists of two types of actors: producers and consumers. Producers send messages to JMS destinations where a consumer pulls and processes the message. JMS supports two production-consumption models: point-topoint and publish-subscribe. In the point-to-point model, each message is processed only once. The JMS destination type is referred to as a queue. Producers put messages on a queue in the same location used by a consumer to pull and process the messages. The publish-subscribe model supports multiple consumers or subscribers that can subscribe to a JMS destination called a topic. The JMS server removes a message from the topic once all subscribers have had a chance to process it. Message-driven beans provide a convenient means to implement JMS consumers. A message driven bean operates as and plays by similar rules as a stateless session bean. However, a bean client directly invokes methods on a session bean while a message-driven bean only implements the method that the container fires in response to messages on a JMS destination. One goal of the JMS architecture is
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to keep developers from worrying about multithreaded programming; messagedriven beans help to further alleviate synchronization concerns.
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B.1.2 Know your host, the EJB container
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EJB live in a runtime environment provided by the EJB container. The container bridges the bean client interface and the actual bean implementation, both of which are defined by the bean provider. The container uses this bridge to intercept bean method invocations, allowing the application server to hook systemlevel tasks at the beginning and end of method invocations. The EJB specification makes services such as transaction management mandatory, while others such as hot deployment are left to vendors devices.
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Container services Remote Method Invocation (RMI) Because EJB is fundamentally a distributed architecture, EJB are typically meant to be remotely accessible. The EJB container abstracts these details. Clients can access EJB components remotely using Java RMI, a pure Java to Java network protocol, or CORBAIIOP, a platform- and language-independent protocol that slightly predates RMI. In the EJB 2.0 specification, container support for IIOP is mandatory. This exposes your bean s functionality to other CORBA-compliant applications including the Microsoft COM architecture among others. The container also ensures that the values you pass back and forth across the remote interface abide by the rules of the underlying transport mechanism. For example, parameters and return values must be serializable.
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Java Naming and Directory Interface (JNDI) The EJB container provides a JNDI service. JNDI is a flexible API used to bind and retrieve objects and other data using URL-like keys. The EJB container makes beans and system resources such as database and JMS connection factories available through a special implementation of the JNDI class called InitialContext. Depending on the vendor s implementation, the information in the InitialContext can be accessed locally or remotely or shared across a cluster. Containers typically bind EJB references under the java:comp/env context. However, as of the EJB 2.0 specification, this is not required. Object life cycle management The EJB container manages the life cycles of EJB components. The container creates, caches, pools, and disposes of EJB instances, optimally servicing client needs. The container also reads and
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