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The most basic persistence layer for a Java application could consist of saving and retrieving domain objects using the JDBC API directly. To flush out the particularly rough spots in the object-relational mismatch, we ll assume automated ORM does not exist and that we are following the direct JDBC route to persistence. Later we ll see that the EJB 3 Persistence API irons out these rough spots through simple configuration. Scott Ambler has written an interesting article that discusses the

problem of mapping objects to a relational database (www.agiledata.org/essays/ mappingObjects.html). One-to-one mapping As we discussed in the previous chapter, one-to-one relationships between entities, though rare in applications, make a great deal of sense in the domain-modeling world. For example, the User and BillingInfo objects represent two logically separate concepts in the real world (we assume) that are bound by a one-to-one relationship. Moreover, we also know that it does not make very much sense for a BillingInfo object to exist without an associated User. The relationship could be unidirectional from User to BillingInfo. Figure 8.1 shows this relationship, and listing 8.1 implements it.

public class User { protected String userId; protected String email; protected BillingInfo billing; }

Digitally sign the message, including the body and header information 2 Encrypt the message headers 3 Add a message ID Digital signing allows you to detect whether a message has been tampered with or compromised Digital signing alone will not encrypt or hide the contents of the message, but it will ensure that a tampered message will be automatically rejected by the receiving Web service Encrypting the message headers will clearly protect its contents, but this approach works best if the message is not being routed or referred to another Web service endpoint Intermediary Web services will need access to the addressing header information, so there is an additional burden on the developer to ensure that the intermediaries can encrypt the message header contents This leads to key management issues and also performance issues if each endpoint is required to decrypt and encrypt message headers.

Figure 5-8. A delegate type under the hood As this figure shows, the generated SampleDelegate has a constructor (named .ctor) that expects a tracking handle to any object, and a native int (a type of the native pointer size). If the target function is a global function or a static function, a nullptr is expected. For nonstatic functions, a tracking handle to the target object is expected. The second argument is used to pass a pointer to the target function. The following code implements a global and a non-static target function and instantiates a delegate for both targets: // delegates.cpp // compile with "cl /clr:safe delegates.cpp" public delegate bool SampleDelegate(int); bool GlobalTargetFunction(int i) {

Using JPA in a web container and the ThreadLocal pattern If you are using an application-managed entity manager in a web container such as Tomcat or Jetty, some persistence providers such as Hibernate recommend that you use the ThreadLocal pattern. This is widely known as the ThreadLocal session pattern in the Hibernate community. It associates a single instance of the EntityManager with a particular request. You have to bind the EntityManager to a thread-local variable and set the EntityManager instance to the associated thread, as shown here:

private static EntityManagerFactory emf; public static final ThreadLocal<EntityManager> _ threadLocal = new ThreadLocal<EntityManager>();

public static EntityManagerFactory getEntityManagerFactory() { if (emf == null) { emf = Persistence.createEntityManagerFactory("actionBazaar"); } return emf; }

public static EntityManager getEntityManager() { EntityManager entityManager = _threadLocal.get(); if (entityManager == null) { EntityManager entityManager = emf.createEntityManager(); _threadLocal.set(entityManager); Associates EntityManager } with a thread return entityManager; }