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The code that is executed before and after a method-execution joinpoint is defined in the invoke method. This method takes a unique parameter that implements the MethodInvocation type, returns an Object, and throws the Throwable type. The definition of MethodInvocation is detailed in the Joinpoint Introspection section later in this chapter. The declaration of the invoke method is shown here:
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CHAPTER 4 JAVA ASPECT COMPONENTS
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public Object invoke( MethodInvocation mi ) throws Throwable; The proceed method can be called by the invoke method to execute the intercepted method. Several aspects can be woven around the same joinpoint. In such a case, a chain of wrappers is created around the joinpoint. The proceed method executes the next wrapper in the chain or, if the end of the chain is reached, the intercepted method. The proceed method can be called several times in the same invoke method. In such a case, several executions of the same method are performed. This can be useful when you need to rerun a method that previously failed. On the other hand, the proceed method might never be called. In such a case, the intercepted method is not executed, and the call is returned to the caller. The general format of the invoke method is shown in Listing 4-7. Listing 4-7. The General Format of the invoke Method public Object invoke( MethodInvocation mi ) throws Throwable { // before code Object ret = proceed(mi); // after code return ret; } The invoke method is mandatory even if no code is defined.
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Like method executions, constructor executions can be aspectized with the construct method. The signature of this method is as follows: public Object construct( ConstructorInvocation ci ) throws Throwable; The proceed method plays the same role for construct as for invoke. No particular characteristics distinguish invoke from construct, except the difference in their names.
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Joinpoint Introspection
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The term introspection refers to examining the inner cause of a given phenomenon and gaining information about it. In the context of AOP, the phenomenon is the joinpoint, and you want to retrieve information about the part of the actual program that allows the joinpoint to occur. With JAC, the introspection mechanism is made available by the MethodInvocation and ConstructorInvocation parameters that are passed when the invoke and construct methods are called. These types are defined in the AOP Alliance API, which is included in JAC. Figure 4-1 illustrates the interface hierarchy that defines MethodInvocation and ConstructorInvocation.
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Figure 4-1. The org.aopalliance.intercept interface hierarchy The JoinPoint interface is the root type for all interceptions. For each joinpoint, three methods are defined: proceed, which executes the joinpoint; getThis, which returns the object where the joinpoint occurred; and getStaticPart, which returns the code element defining the joinpoint. This code element can be either a method or a constructor. It is represented by the java.lang.reflect.AccessibleObject class which, in the J2SE reflection API, is the superclass of all the code elements where reflection applies. The Invocation interface extends JoinPoint with the getArguments method to manipulate the arguments of the intercepted execution. These arguments are returned as an array of objects that can be read or written. The last two interfaces, ConstructorInvocation and MethodInvocation, correspond to constructor executions and method executions. Each provides a method that returns the intercepted constructor (as a parameter of type java.lang.reflect.Constructor) or the intercepted method (as a parameter of type java.lang.reflect.Method).
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Wrapper Chains
Several wrappers can be attached to the same joinpoint. These wrappers are referred to as chained. In a wrapper, the call to proceed executes the next wrapper in the chain. When the end of the chain has been reached, the joinpoint will be executed. Figure 4-2 illustrates this mechanism with a chain of three wrappers. Each arrow represents either a method call or a method return. The arrows are numbered to indicate the execution-flow order.
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