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Since annotations are added to the bytecode of classes and are part of class and method declarations, they are static and immutable. This means Spring AOP can get annotations with static (nondynamic) pointcuts. We will continue to look at binding annotation objects to advice method arguments that come from two locations: Annotations declared on methods Annotations declared on classes In this section, we will extend the @Audit example we used when we introduced annotations earlier in this chapter. First, we will add a property to the @Audit annotation, as shown in Listing 4-61. Listing 4-61. Adding a Property to the @Audit Annotation package com.apress.springbook.chapter04; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; @Retention(RetentionPolicy.RUNTIME) public @interface Audit { String value() default ""; }
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CHAPTER 4 SPRING AOP 2.0
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By adding a value to the @Audit annotation, we can pass specific information that we can use while retaining audit information. Next, we ll change the auditableMethods() pointcut declaration on the SystemPointcutsAdvice to work with argument binding, as shown in Listing 4-62. Listing 4-62. Changing the auditableMethods() Pointcut Declaration to Work with Argument Binding package com.apress.springbook.chapter04.aspects; import com.apress.springbook.chapter04.Audit; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Pointcut; @Aspect public class SystemPointcutsAspect { @Pointcut("@annotation(audit)") public void auditableMethods(Audit audit) {} } We ve changed the pointcut declaration to support binding @Audit annotation objects that are declared on method execution join points. The @annotation() pointcut designator takes the name of the audit argument in the auditableMethods() method. @annotation() takes a variable name, instead of a type, to specify that we want to bind an annotation object. auditableMethods() declares an argument of type Audit to tell Spring AOP that only @Audit annotations are to be selected by this pointcut. Listing 4-63 shows the BusinessOperations class with the @Audit annotation. Listing 4-63. Declaring the @Audit Annotation with Additional Information package com.apress.springbook.chapter04; public class BusinessOperations { @Audit("top secret") public void sensitiveOperation(long recordId) { } } We need to change the AuditInformationRetentionAspect aspect slightly from Listing 4-50 to enable the argument binding of the annotation object that is declared on a join point, as shown in Listing 4-64. Listing 4-64. Binding Annotation Objects Declared on Objects package com.apress.springbook.chapter04.aspects; import com.apress.springbook.chapter04.Audit; import com.apress.springbook.chapter04.CurrentUserInformation; import com.apress.springbook.chapter04.AuditInformationRetentionPolicy; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.JoinPoint;
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CHAPTER 4 SPRING AOP 2.0
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@Aspect public class AuditInformationRetentionAspect { private AuditInformationRetentionPolicy auditInformationRetentionPolicy; private CurrentUserInformation currentUserInformation; public void setAuditInformationRetentionPolicy( AuditInformationRetentionPolicy auditInformationRetentionPolicy) { this.auditInformationRetentionPolicy = auditInformationRetentionPolicy; } public void setCurrentUserInformation( CurrentUserInformation currentUserInformation) { this.currentUserInformation = currentUserInformation; } public void init() { if (this.auditInformationRetentionPolicy == null) { throw new IllegalStateException("AuditInformationRetentionPolicy " + "object is not set!"); } if (this.currentUserInformation == null) { throw new IllegalStateException("CurrentUserInformation " + "object is not set!"); } } @Before("com.apress.springbook.chapter04.aspects." + "SystemPointcutsAspect.auditableMethods(audit)") public void retainMethodInvocationInformation(JoinPoint joinPoint, Audit audit) { String currentUser = this.currentUserInformation.getUsername(); String methodDescription = audit.value() + ":" + joinPoint.getSignature().toLongString(); Object[] arguments = joinPoint.getArgs(); this.auditInformationRetentionPolicy.retainMethodInvocationInformation( currentUser, methodDescription, arguments); } } The auditableMethods() pointcut on SystemPointcutsAspect takes the name of the argument in the retainMethodInvocationInformation() advice method. Notice this advice method still has the JoinPoint argument as its first argument and the audit annotation type as the second argument. The JoinPoint argument is bound automatically by Spring AOP, and auditableMethods() calls @annotation() to bind the Audit annotation argument. Because the pointcut doesn t specify the annotation type, Spring AOP decides that the argument in @annotation() is referred to by name. In this way, the retainMethodInvocationInformation() advice method is executed only for join points that declare the @Audit annotation. Notice the pointcut in Listing 4-64 doesn t reuse another pointcut. The reuse of pointcuts doesn t support binding arguments to advice methods. We can also bind annotations that are declared on classes to advice methods using the @within() pointcut designator. Consider again the MoreBusinessOperations class, as shown in Listing 4-65.
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