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pointcuts, AspectJ 5 defining aspects with annotations, 55 @Pointcut annotation, 55 pointcuts, JAC aspect configuration, 65 associating wrapper with, 71 72 brief summary, 88 creating, 68 72 associating wrapper with pointcut, 71 72 pointcut expressions, 68 71 creating JAC aspect, 62 distributed aspects, 84 pointcut expressions class expression, 68 creating pointcuts, 68 72 method expression, 69 method-type operators, 70 71 object expression, 68 regular expressions, 69 subexpressions, 68 pointcut method parameters, 62 pointcut method, AspectComponent class, 62 creating pointcuts, 68 pointcuts, JBoss AOP, 95 99 annotations in pointcut definitions, 105 associating interceptor with pointcut, 98 99 extending manageable resource with an aspect, 203 filtering joinpoints, 98 implementing preconditions, 177 introduction, 92 pointcut tag, pointcut-naming, 97 @PointcutDef annotation, 106 types of JBoss AOP pointcuts, 96 weaving, dynamic AOP, 108 XML definition of pointcut, 92 pointcuts, Spring AOP 120, 122 126 , definition of, 122 linking to interceptor, 121 Pointcut interface, 122 pointcut property, 126 PointcutAdvisor interface, 125 programmatically defined pointcuts, 123 124 regexp pointcuts, 124 POJO (Plain Old Java Objects) AccountPOJO class, 245 implementing EJBs, 228 POJOEntity aspect, 240, 242, 258 POJOSession aspect, 232 233, 242 business tier improvements using AOP 250, , 252 description, 258 postcondition assertions, 177 179 precondition assertions, 173, 174 177

@Resource EJBContext context;

different JDBC connections to commit. If both connections succeed, the transaction is considered a success.

Using this code in a session bean would make a lot of sense if you did not plan to use any of the bean-type specific methods available through the SessionContext interface anyway. Accessing environment entries If you have been working with enterprise applications for any length of time, it is likely you have encountered situations where some parameters of your application change from one deployment to another (customer site information, product version, and so on). It is overkill to save this kind of semi-static information in the database. This is exactly the situation environment entry values are designed to solve. For example, in the ActionBazaar application, suppose we want to set the censorship flag for certain countries. If this flag is on, the ActionBazaar application checks items posted against a censorship list specific to the country the application deployment instance is geared toward. We can inject an instance of an environment entry as follows:

@Resource private boolean censorship;

precondition factorization, 254 AOP based implementation, 255 parameter precondition aspect, 255 regular implementation, 254 255 preinitialization joinpoint types, AspectJ, 42 @Prepare annotation, JBoss AOP, 108 prepare tag, jboss-aop.xml, 108 presentation tier see also web presentation tier J2EE design patterns, 223 sample application, 206 web presentation tier, 219 PresentationAC aspect, JAC, 76 priceList hash map, Catalog Class, AspectJ, 26 privileged aspect, AspectJ, 52 procedural programming, 2 proceed keyword, AspectJ, 45 proceed method execution of program with around advice code, 28 29 FrontController class, 300 implementing empty methods within aspects, 246 JAC, 64, 73 JBoss AOP 111 , Spring AOP, 121, 126 program control flow joinpoints, 14 programming paradigms, 1 OOP 2 , procedural programming, 2 properties application-descriptor files, JAC, 66, 78 initialization of properties, Spring AOP, 115 props data element, Spring AOP, 118 protocols implicit protocol technique, 246 proxies auto-proxy feature, Spring AOP 133 134 , Proxy design pattern, 168 170 ProxyFactory class, Spring AOP, 133

Environment entries are specified in the deployment descriptor and are accessible via JNDI. The ActionBazaar censorship flag could be specified like this:

3.2 Creating EJB 2.0 container-managed persistence 5.1 Tuning the container transaction control for your EJB 5.7 Combining entity updates into a single transaction

<env-entry> <env-entry-name>censorship</env-entry-name> <env-entry-type>java.lang.Boolean</env-entry-type> <env-entry-value>true</env-entry-value> </env-entry>

Environment entries are essentially meant to be robust application constants and support a relatively small range of data types. Specifically, the values of the <env-entry-type> tag are limited to these Java types: String, Character, Byte, Short, Integer, Long, Boolean, Double, and Float. Because environment entries are accessible via JNDI they can be injected by name. We could inject the censorship flag environment entry into any EJB by explicitly specifying the JNDI name as follows:

With the introduction of the message-driven bean in the EJB 2.0 specification, Enterprise JavaBean applications can now easily be integrated with messaging systems. Java 2 Platform Enterprise Edition (J2EE)-compliant application servers are required to provide messaging capabilities. Before the message-driven bean, EJB applications could still send Java Message Service (JMS) messages and listen for those messages by including a JMS listener object; however, messages had to be processed in a synchronous manner. Message-driven beans are now the ideal way to expose business logic to messaging applications. This chapter primarily focuses on problems associated with message-driven bean development. In this chapter, you will find recipes dealing with these topics:

Quality of Service Design by Contract, 171 180coverage analysis, 181 185 Java Management Extensions (JMX), 191 202 nonregression tests, 185 190 testing applications, 180 190

@Resource(name="censorship") private boolean censorship;

As you might gather, the data types of the environment entry and the injected variable must be compatible. Otherwise, the container throws a runtime exception while attempting DI.