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If we create an instance of this class, we could use this Identifier property to get and set its identifier. Example 3-3 shows this in a modified version of the Main function in our Program.cs file.

This looks like a normal method, except for the parameter it takes: playerDelegate, which is not an int, as you might expect, but rather a delegate, of type PlayMedia, which you declared earlier. It s not easy to think of a method in the same terms that you might normally think of an object, but that s how delegates work. In the body of the method, you can t declare playerDelegate directly as an integer, because playerDelegate is a reference to a method. Instead, you evaluate the method that the delegate points to, and compare the result. That s why you re testing playerDelegate( ) == 0. From there, you just output an appropriate message. Take a look now at one of the media player classes:

SOAP 1.2, still under development, looks to be moving away from an RPC model, in which the caller blocks till the response is received, to a more asynchronous model in which SOAP messages are routed to a destination. Some of the low-level APIs used to support XML messaging in Java can work with this model, specifically the JAXM API for XML messaging. 356 WORKING WITH WEB SERVICES

ErrorHandler: GeneralError("GroupName.DeleteRecord", Err.GetException( )) TransactionRollback( ) Return False End Function

When we specify patterns that will match these signatures in pointcuts, we refer to them as signature patterns. At times, a pointcut will specify a join point using one particular signature, but often it identifies join points specified by multiple signatures that are grouped together using matching patterns. In this section, we first examine three kinds of signature patterns in AspectJ type, method, and field and we then see how they are used in pointcut definitions in section 3.1.3. Pointcuts that use the wildcards *, .., and + in order to capture join points that share common characteristics in their signatures are called property-based pointcuts. We have already seen an example of a signature that uses * and .. in figure 3.1. Note that these wildcards have different usages in the type, method, and field signatures. We will point out these usages as we discuss the signatures and how they are matched. Type signature patterns The term type collectively refers to classes, interfaces, and primitive types. In AspectJ, type also refers to aspects. A type signature pattern in a pointcut specifies the join points in a type, or a set of types, at which you want to perform some crosscutting action. For a set of types, it can use wildcards, unary, and binary operators. The * wildcard is used in a type signature pattern to specify a part of the class, interface, or package name. The wildcard .. is used to denote all direct and indirect subpackages. The + wildcard is used to denote a subtype (subclass or subinterface). For example, the following signature matches JComponent and all its direct and indirect subclasses, such as JTable, JTree, JButton, and so on:

You can also use an anonymous pointcut as part of another pointcut. For example, the following pointcut uses an anonymous within() pointcut to limit the join points captured by calls to accountOperations() that are made from classes with banking as the root package:

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