Pointcuts in Java

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Pointcuts
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because static methods are not invoked on a object, the target() pointcut will not match calls to such a method. There are a few important differences in the way matching is performed between within() and this(): The former will match when the object in the lexical scope matches the type specified in the pointcut, whereas the latter will match when the current execution object is of a type that is specified in the pointcut or its subclass. The code snippet that follows shows the difference between the two pointcuts. We have a SavingsAccount class that extends the Account class. The Account class also contains a nested class: Helper. The join points that will be captured by within(Account) and this(Account) are annotated.
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public class Account { ... public void debit(float amount) throws InsufficientBalanceException { ... } private static class Helper { ... } } public class SavingsAccount extends Account { ... }
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Captured by within(Account) Captured by this(Account)
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Captured by within(Account)
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In this example, within(Account) will match all join points inside the definition of the Account class, including any nested classes, but no join points inside its subclasses, such as SavingsAccount. On the other hand, this(Account) will match all join points inside the definition of the Account class as well as SavingsAccount, but will exclude any join points inside either class s nested classes. You can match all the join points in subclasses of a type while excluding the type itself by using the this(Type) && !within(Type) idiom. Another difference between the two pointcuts is their context collection capability: within() cannot collect any context, but this() can. Also note that the two pointcuts call(* Account.*(..)) and call(* *.*(..)) && this(Account) won t capture the same join points. The first one will pick up all the instance and static methods defined in the Account class and all the parent classes in the inheritance hierarchy, whereas the latter will pick up the same instance methods and any methods in the subclasses of the Account class, but none of the static methods.
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AspectJ: syntax basics
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Argument pointcuts These pointcuts capture join points based on the argument type of a join point. For method and constructor join points, the arguments are simply the method and constructor arguments. For exception handler join points, the handled exception object is considered an argument, whereas for field write access join points, the new value to be set is considered the argument for the join point. Argument-based pointcuts take the form of args(TypePattern or ObjectIdentifier, ..). Similar to execution object pointcuts, these pointcuts can be used to capture the context, but again more will be said about this in section 3.2.6. Table 3.10 shows some examples of the usage of argument pointcuts.
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Table 3.10 Examples of argument pointcuts Pointcut args(String,.., int) args(RemoteException) Natural Language Description All the join points in all methods where the first argument is of type String and the last argument is of type int. All the join points with a single argument of type RemoteException. It would match a method taking a single RemoteException argument, a field write access setting a value of type RemoteException, or an exception handler of type RemoteException.
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Conditional check pointcuts This pointcut captures join points based on some conditional check at the join point. It takes the form of if(BooleanExpression). Table 3.11 shows some examples of the usage of conditional check pointcuts.
Table 3.11 Examples of conditional check pointcuts Pointcut if(System.currentTimeMillis() > triggerTime) if(circle.getRadius() < 5) Natural Language Description All the join points occurring after the current time has crossed the triggerTime value. All the join points where the circle s radius is smaller than 5. The circle object must be a context collected by the other parts of the pointcut. See section 3.2.6 for details about the context-collection mechanism.
We now have completed the overview of all the pointcuts supported in AspectJ. In the next section, we study the dynamic crosscutting concept of advice. Writing an advice entails first specifying a pointcut and then defining the action to be taken at the join points captured by the pointcut. Later, in section 3.3, we discuss using pointcuts for static crosscutting.
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