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Message-driven beans (added to the EJB 2.0 specification) are assigned to receive messages from a particular JMS message destination. These EJBs are ideal for executing business logic asynchronously and for exposing EJB applications to enterprise messaging systems. Message-driven beans use the same transaction models (see chapter 5) and declarative security (see chapter 7) as do session and entity beans. Another advantage of message-driven beans is that they can be used to process messages concurrently. EJB containers can create a pool of identical messagedriven beans that are able to process messages at the same time, generating a great deal of processing power.

Around invoke methods It s important to realize that an interceptor must always have only one method that is designated as the around invoke (AroundInvoke) method. Around invoke methods must not be business methods, which means that they should not be public methods in the bean s business interface(s). An around invoke method is automatically triggered by the container when a client invokes a method that has designated it to be its interceptor. In listing 5.2, the triggered method is marked with the @AroundInvoke annotation:

@AroundInvoke public Object logMethodEntry( InvocationContext invocationContext) throws Exception { System.out.println("Entering method: " + invocationContext.getMethod().getName()); return invocationContext.proceed(); }

This recipe illustrates how to build a simple message-driven bean and create its XML descriptor. The class in listing 6.3 defines a message-driven bean. It implements the required MessageDrivenBean interface and the necessary MessageListener interface that allows the bean to receive JMS messages.

target keyword, AspectJ joinpoint filtering, 40 joinpoints, 43 pointcut parameterization, 41 testing applications, 180 191 this keyword, AspectJ, 43 thisJoinPoint keyword, AspectJ, 34 threads using JMX with AOP 196 , throws advice, Spring AOP, 127 128 ThrowsAdvice interface, Spring AOP, 127 tiers sample application architecture, 205 206 toBeTraced pointcut descriptor, AspectJ, 27 topology property, jac, 78 trace aspect, AspectJ, 24 trace aspects, JAC, 61 trace aspects, Spring AOP, 120 trace method, JAC, 65 TraceAspect aspect, AspectJ, 27, 28 TraceAspect class, JAC, 62 TraceInterceptor class, Spring AOP, 121 TraceInterceptor.java files defining JBoss AOP aspect, 91 TraceWrapper class, JAC creating aspect, 62 creating wrapper, 63 Transaction aspect, 266 anchoring protocol technique, 268 transaction aspect, JAC, 83 Transaction Controller interface, 212 transaction management modular integration of transactions, 266 268 parameter precondition aspect, 255 Spring AOP, 119 TransactionAC aspect, JAC, 83 TransactionAttributeSourceAdvisor, Spring AOP, 134 transaction-demarcation aspect, JAC, 64 transactions declarative mechanism in J2EE, 265 EJBs for automatic integration of, 264 266 manual control with JTA, 262 transfer object aspect (client side), 290 transfer object aspect (server side), 289 transfer object pattern J2EE design solutions, 221 transferFunds method TxControllerBean class, 230, 262, 264 TxControllerPOJO class, 260 TransferOptimizer aspect client/server communication, 292 transparency

In effect, this means that the logMethodEntry method will be executed whenever the ActionBazaarLogger interceptor is triggered. As you might gather from this code, any method designated AroundInvoke must follow this pattern:

The InvocationContext interface passed in as the single parameter to the method provides a number of features that makes the AOP mechanism extremely flexible. The logMethodEntry method uses just two of the methods included in the interface. The getMethod().getName() call returns the name of the method being intercepted addBid in our case.

public class SampleMDB implements MessageDrivenBean, MessageListener { Implements the private MessageDrivenContext ctx; public void ejbRemove() { } public void ejbPassivate() { }

The call to the proceed method is extremely critical to the functioning of the interceptor. In our case, we always return the object returned by InvocationContext.proceed in the logMethodEntry method. This tells the container that it should proceed to the next interceptor in the execution chain or call the intercepted business method. On the other hand, not calling the proceed method will bring processing to a halt and avoid the business method (and any other interceptor down the execution chain) from being called. This feature can be extremely useful for procedures like security validation. For example, the following interceptor method prevents the intercepted business method from being executed if security validation fails:

see also composition transparency Singleton pattern, 151 Tx interface sample application, 214 TX_BEAN_MANAGED attribute, 264 265 TX_MANDATORY attribute, 264 TX_NOT_SUPPORTED attribute, 264 TX_REQUIRED attribute, 264 TX_REQUIRES_NEW attribute, 264 TX_SUPPORTS attribute, 264 TxCheckArgs aspect, 255 TxController facade, 212 business tier aspects, 258 precondition factorization, 254 resolving object references, 248 session facade pattern, 228, 232 TxControllerBean class, 229 anchoring protocol, transferFunds method, 267 manual control of transactions, JTA, 262 withdraw method, 258 TxControllerPOJO class business tier aspects, 259 business tier improvements, 250 withdraw method, 253

@AroundInvoke public Object validateSecurity(InvocationContext invocationContext) throws Exception { if (!validate(...)) { throw new SecurityException("Security cannot be validated. " + "The method invocation is being blocked."); } return invocationContext.proceed(); }

public void setMessageDrivenContext(MessageDrivenContext ctx) { this.ctx = ctx; } public void ejbCreate () throws CreateException { public void ejbActivate() { } }