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implementation of business object pattern, 239 code scattering, 8 limitations of OOP, 5 collaborators, Spring AOP auto-wiring collaborators, 119 Command design pattern, 161 165 description, 161 evaluating AOP implementation, 164 AspectJ implementation, 161 164 interfaces to be used with, 162 command objects, 298 comments application-descriptor files, JAC, 78 Commons project, Eclipse IDE, 207 service locator pattern, 221 communications distributed communications, 271, 291 comparator coverage analysis, 181 component containers AOP or component containers, 227 composition transparency Chain of Responsibility pattern, 167 design patterns in AOP, 150 Observer pattern, 161 computeAmount method, Order Class, AspectJ, 25 concerns, 10 AOP as integration technique, 261 component containers, 227 manual control of transactions with JTA, 264 nonfunctional concerns, 10 configured aspects, Spring AOP Advised interface, 132 133 programmatically configured aspects, 132 configuring aspects, JAC, 75 78 configuring JAC applications, 78 confirmation aspect, JAC, 81, 83 ConfirmationAC aspect, JAC, 83 consistency aspect, JAC, 84 ConsistencyAC aspect, JAC, 84 construct method, JAC creating JAC wrapper, 64 creating wrappers, 73 construction tag, jboss-aop.xml file mix-in mechanism, JBoss AOP 103 , constructor execution joinpoint type comparing AOP tools, 140 constructor value, autowire attribute bean data element, Spring AOP 119 , constructor-execution pointcuts, JBoss AOP, 97 ConstructorInvocation class joinpoint introspection, JBoss AOP 102 , ConstructorInvocation parameter

as you need them to be. They can include literals, identifiers, whitespace, expressions, standard brackets, logical and comparison operators, arithmetic operators, and null comparisons. Using our JMS message selector example, we could specify in our MDB that we want to handle only fragile shipping requests as follows:

@ActivationConfigProperty( propertyName="messageSelector", propertyValue="Fragile IS TRUE")

public class SimpleBean implements SessionBean { public void businessMethodOne() { UserTransaction transaction = ejbContext.getUserTransaction(); transaction.begin(); //do some work } public void businessMethodTwo() { // do some work UserTransaction transaction = ejbContext.getUserTransaction(); transaction.commit(); } }

Table 4.2 Commonly used message selector types. The selector syntax is almost identical to the SQL WHERE clause. Type Literals Description Can be strings, exact or approximate numeric values, or booleans. Example BidManagerMDB 100 TRUE RECIPIENT NumOfBids Fragile JMSTimestamp

joinpoint introspection, JAC, 73 constructors bean class definition, Spring AOP 116 , creating wrappers, JAC, 73 evaluation of Singleton pattern, 156 157 introduction mechanism, AspectJ, 47 joinpoint types, AspectJ, 37 container managed solutions, 224 AOP as integration technique, 261 containsBean method, BeanFactory class Spring AOP, 116 context object pattern using AOP in web presentation tier, 304 306 context objects, 299 contracts see also Design by Contract AOP implementing, 174 179 conflict handling, 173 contracting parties, 172 control-flow filtering joinpoints, AspectJ, 40 CounterMonitor monitor type MBeanServer component, 193 coverage analysis, 181 185 introduction, 171 recorder, 181 create method resolving object references, 247 crosscutting concerns manual control of transactions with JTA, 263 resolving object references, 248 service locator pattern, 277 crosscutting functionalities AOP summary, 20 aspects and classes compared, 9 integration of, 10 data-persistence functionality, 10 limitations of OOP, 4 crosscutting structure definition of aspect, 8 Cunningham, Ward, 149 Customer Class, AspectJ, 24 CustomerAndAccountInfos class data transfer objects, 288

Same as defined in the Java language specification: space, tab, form feed, and line terminator. Comparison operators, such as =, >, >=, <=, <>. All three types of logical operators NOT, AND, OR are supported. IS NULL and IS NOT NULL comparisons. IS [NOT] TRUE and IS [NOT] FALSE comparisons. RECIPIENT='BidManagerMDB' NumOfBids>=100 RECIPIENT='BidManagerMDB' AND NumOfBids>=100 FirstName IS NOT NULL Fragile IS TRUE Fragile IS FALSE

As you recall from chapter 3, similar to stateless session beans, MDBs have a simple lifecycle (see figure 4.8 for a refresher). The container is responsible for the following:

This recipe does not apply to stateless session beans. Because stateless beans are shared across multiple clients, it does not make sense to share transactions across them. Per the EJB specification, one transaction cannot start in one stateless method or bean and complete in another. For stateless bean methods, transactions must be started and completed within the method invocation. This solution should therefore be applied only to stateful beans or entity beans as needed.

Creates MDB instances and sets them up Injects resources, including the message-driven context (discussed in the next chapter in detail) Places instances in a managed pool Pulls an idle bean out of the pool when a message arrives (the container may have to increase the pool size at this point) Executes the message listener method; e.g., the onMessage method When the onMessage method finishes executing, pushes the idle bean back into the method-ready pool As needed, retires (or destroys) beans out of the pool

Figure 4.8 The MDB lifecycle has three states: does not exist, idle, and busy. There are only two lifecycle callbacks corresponding to bean creation and destruction; you can use PostConstruct and PreDestroy methods to receive these callbacks.

D language, 23 data elements, XML Spring AOP, 117 data tier sample application, 206, 208 209 data transfer object pattern aspect-oriented implementation, 287 transfer object aspect (client side), 290 debugging applications

5.1 Tuning the container transaction control for your EJB 5.2 Handling transaction management without the container 5.13 Propagating a transaction to a nonEJB class