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Business logic should be decoupled and modularized away from messaging-specific concerns We followed this principle by coding the processShippingRequest method and invoking it from onMessage An excellent practice (but one that would have made this chapter unnecessarily complicated) is to put business logic in session beans and invoke them from the onMessage method Make good use of message filters There are some valid reasons for using a single messaging destination for multiple purposes Message selectors come in handy in these circumstances For example, if you re using the same queue for both shipping requests and order cancellation notices, you can have the client set a message property identifying the type of request You can then use message selectors on two separate MDBs to isolate and handle each kind of request.

benefits of implementing contracts, 172 declarative management solutions, 224 declare precedence keywords, AspectJ, 51 52 declare soft keywords, AspectJ, 49 declare statements, AspectJ 5 defining aspects with annotations, 57 declare warning keywords, AspectJ, 52 DefaultAdvisorAutoProxyCreator, Spring AOP, 134 DelegatingIntroductionInterceptor, Spring AOP, 130 131 deleteRow method, AccountBean class, 237 Dependency Injection, Spring AOP, 113 constructor-based dependency injection, 117 description, 135 setter-based dependency injection, 117 dependency inversion, 12 deployment aspect, JAC, 84 deployment descriptor file sample application, 215 DeploymentAC aspect, JAC, 84 deploySunONE.bat file deploying sample application, 208 design aspect composition, 20 sample application, 225 Design by Contract, 171 180 contracts in Java, 174 foundations of, 172 174 implementing contracts with AOP 174 179 , implementing invariants, 179 implementing postconditions, 177 179 implementing preconditions, 174 177 introduction, 171 design patterns, 149 application controller pattern, 302 304 business delegate pattern, 272 277 business layer access, 272 business object pattern, 233 246 Chain of Responsibility pattern, 165 168 Command pattern, 161 164 context object pattern, 304 306 crosscutting, 150 data transfer object pattern, 278 280 evaluating benefit of AOP implementation, 170 filter object pattern, 308 front controller pattern, 298 302 implementation with AOP 150 , improving business tier patterns, 228 246 interception filter, 306 308 J2EE client tier patterns, 223 J2EE design solutions, 219 225 business object pattern, 220 context object pattern, 223

Conversely, in some cases, you might dramatically improve performance and keep your code simple by using separate destinations instead of using selectors In our example, using separate queues and MDBs for shipping requests and cancellation orders could make message delivery much faster In this case, the client would have to send each request type to the appropriate queue Choose message types carefully The choice of message type is not always as obvious as it seems For example, it is a compelling idea to use XML strings for.

To start a transaction in the client layer, first create an instance of the JNDI context and use it to acquire a UserTransaction instance (see listing 5.12).

The EntityManager API is probably the most important and interesting part of the Java Persistence API. It manages the lifecycle of entities. In this section you ll learn about the EntityManager interface and its methods. We ll explore the entity lifecycle, and you ll also learn about persistence contexts and their types.

In a sense, the EntityManager is the bridge between the OO and relational worlds, as depicted in figure 9.1. When you request that a domain entity be created, the EntityManager translates the entity into a new database record. When you request

Figure 9.1 The EntityManager acts as a bridge between the OO and relational worlds. It interprets the O/R mapping specified for an entity and saves the entity in the database.

Properties props = new Properties(); //put any necessary vendor props Context myJNDIContext = new InitialContext( props ); UserTransaction transaction = (UserTransaction) myJNDIContext.lookup( "java:comp/env/UserTransaction" ); try { transaction.begin(); //do some work with EJBs transaction.commit(); } catch( Exception e ) { transaction.rollback(); }

front controller pattern, 223 intercepting filter pattern, 223 service locator pattern, 221 Observer pattern, 157 161 Proxy pattern, 168 170 service locator pattern, 277 session facade pattern, 228 233 Singleton pattern, 151 157 using AOP in web presentation tier, 298 309 view helper pattern, 309 DisTransAC aspect, JAC, 83 distributed aspects distributed applications, 83 pointcuts, JAC, 84 distributed communications using AOP for, 271 292 distributed services layer, JMX, 192, 193 distributed transactions, 262 264 distributed transactions aspect, JAC, 83 documentation benefits of implementing contracts, 172 Duke s Bank application sample application architecture, 205 219 sample application design, 219 225 dynamic AOP JBoss AOP 108 , , dynamic shadow selection, AOP, 123 dynaop, AOP Alliance framework, 64