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Introducing the Entity Access Object pattern 9 demonstrated how to use the EntityManager API directly from the business logic in a session bean. The problem with this approach is that entity access code gets sprinkled throughout the business logic, which is a maintenance nightmare. The Entity Access Object (EAO) pattern decouples the entity access logic from the business logic and improves code maintainability. It allows you to easily change your underlying entity access code without affecting the business logic. If you implement the EAO pattern in your applications, it is significantly easier to change your persistence-tier mechanism from JDBC, EJB 2 CMP, or some proprietary persistence mechanism to JPA. You can learn more about data access objects from Sun s blueprints website (http://java.sun.com/blueprints/corej2eepatterns/Patterns/DataAccessObject. html). Just replace all references to DAO with EAO, and references to transfer objects with entities. The EAO pattern abstracts data access code, for example, using JPA from the business logic code. Usually you have one EAO object for every domain object (entity) that performs the CRUD operations for the domain objects (entities). Figure 12.1 shows the class diagram of the EAO defined for the Bid entity of the ActionBazaar system. As shown in figure 12.1, BidEAO is the entity access object that manipulates the Bid entity. A business object such as the PlaceBid EJB will persist and retrieve instances of the Bid entity by using BidEAO. It hides from the PlaceBid EJB the actual persistence mechanism used to store the entity. Now let s explore how to implement an entity access object for the Bid entity.

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Since all the primitives shown here, and their native equivalents, have the same binary layout, a primitive type in managed code can still be used as a native primitive, if this is required by the context. The following sample code shows this. Even though a variable of type System::Double is passed to std::cout, the code compiles and works as expected. // primitives.cpp // build with "CL /clr primitives.cpp" #include <iostream> using namespace std; int main() { System::Double PI = 3.14159265358979; cout << PI; }

Figure 12.1 BidEAO is the interface for the EAO object. BidEAOImpl is the EAO class that implements the logic for CRUD operations for the Bid entity.

CHAPTER 9 BEYOND WSE 3.0: LOOKING AHEAD TO WINDOWS COMMUNICATION FOUNDATION (WCF)

Implementing the entity access object The following code for the BidEAO interface exposes the operations that can be performed on a Bid:

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public interface BidEAO { public Bid addBid(Item item, String bidderId, double bidPrice); public Bid cancelBid(Long bidId); ... }

To distinguish the definition of CTS types from native type definitions, a set of new keywords has been introduced. These new keywords include white spaces, which avoids conflicts with

Some developers believe that using an interface for the entity access object is too much trouble. However, you ll learn just how advantageous it is do so when we discuss using the EJB 3 JPA with Spring in chapter 16. An interface allows you to change the underlying persistence provider with no effect on the classes that use the EAO interface. Listing 12.1 shows the implementation class for the EAO that performs the CRUD operations.

public class BidEAOImpl implements BidEAO { private static String EM_NAME = "java:comp/env/actionBazaar"; public BidEAOImpl() { } private EntityManager getEntityManager() { try {

Context ctx = new InitialContext(); return (EntityManager)ctx.lookup(EM_NAME); } catch (Exception e) { e.printStackTrace(); return null; } } public Bid addBid(Item item, String bidderId, double bidPrice) throws BidException { EntityManager em = getEntityManager(); if (em != null) { Gets EntityManager Bid bid = new Bid(); instance ... em.persist(bid); Persists Entity return bid; } ... }

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The transport and formatter layer is what enables messages to be moved across the wire. WCF supports a wide range of transport protocols, as shown in Table 9-2, which indicates the associated WCF object that abstracts the transport protocol information. Table 9-2. WCF-Supported Transport Protocols

public Bid cancelBid(Long bidId) { ... } }

identifiers (names for variables, types, and type members) in existing C++ code. As an example, the keyword ref class is used to define a custom CTS class. The following code shows a simple managed type definition: ref class ManagedReferenceType { int aPrivateField; public: void APublicFunction(); }; The CTS supports the definition of various other kinds of types and type members. These will be discussed in 5.

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