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so on. To navigate from one type to another one, each of these types offers functions with the prefix Get. The following code uses Assembly::GetTypes to iterate through all type definitions of an assembly: // dumpAssemblyTypes.cpp // build with "CL /clr:safe dumpAssemblyTypes.cpp" using namespace System; using namespace System::Reflection; int main( array<String^>^ args) { for each (String^ url in args) { Assembly^ a = Assembly::LoadFrom(url); Console::WriteLine(a->Location); for each (Type^ t in a->GetTypes()) { Console::WriteLine(t); Console::WriteLine("Base class: {0}", t->BaseType); if (t->IsValueType) Console::WriteLine("This is a value type"); } } } Assembly::GetTypes returns an array of System::Type handles. Instances of System::Type are called type objects. Each handle refers to a type object that describes a public type of the assembly. System::Type allows you to find out almost everything about a type, including its name, base class, and supported interfaces. When a handle to a type object is passed to Console::WriteLine, then Type s overload for ToString is called. Type::ToString simply returns the namespace-qualified type name. However, the string returned is not a C++-like type name, but a language-neutral type name. Since most .NET languages use the dot character (.) as a namespace separator, Type::ToString does the same. There are various ways to get a type information object. As mentioned before, System::Object has a function called GetType(). Using this method, you can easily find out the type of any managed object and of any managed value. If the requested type is known at build time, the keyword typeid can be used. The following code checks if an object passed is of type String: bool IsString(Object^ o) { return o != nullptr && o->GetType() == String::typeid; }

String memberStatus = (String) invocationContext.getContextData().get("MemberStatus");

The following is the AroundInvoke method of the DiscountVerifierInterceptor that actually uses the invocation context as well as most of the methods we discussed earlier:

This is yet another reason all Web services logic should be abstracted out to dedicated business components The architecture in Figure 1-3 is a good start, but it quickly breaks down under the demand of more sophisticated SOA applications Figure 1-4 provides one example of a more complex SOA solution..

@AroundInvoke public Object giveDiscount(InvocationContext context) throws Exception { System.out.println("*** DiscountVerifier Interceptor" + " invoked for " + context.getMethod().getName() + " ***"); if (context.getMethod().getName().equals("chargePostingFee") && (((String)(context.getContextData().get("MemberStatus"))) .equals("Gold"))) { Object[] parameters = context.getParameters(); parameters[2] = new Double ((Double) parameters[2] * 0.99); System.out.println ( "*** DiscountVerifier Reducing Price by 1 percent ***"); context.setParameters(parameters); } return context.proceed(); }

If you have a string representing the type s name in the language-neutral form, you can use Type::GetType(String^) to retrieve a type information object. As an example, the following expression is true: Type::GetType("System.Int32") == int::typeid

You can throw or handle a runtime or checked exception in a business method interceptor. If a business method interceptor throws an exception before invoking the proceed method, the processing of other interceptors in the invocation chain and the target business method will be terminated. Recall our discussion on lifecycle callback methods in chapters 3 and 4. This isn t readily obvious, but lifecycle callbacks are a form of interception as well. While method interceptors are triggered when a business method is invoked, lifecycle callbacks are triggered when a bean transitions from one lifecycle state to another. Although this was not the case in our previous lifecycle examples, in some cases such methods can be used for crosscutting concerns (e.g., logging and profiling) that can be shared across beans. For this reason, you can define lifecycle callbacks in interceptor classes in addition to business method interceptors. Let s take a look at how to do this next.

Recall that the @PostConstruct, @PrePassivate, @PostActivate, and @PreDestroy annotations can be applied to bean methods to receive lifecycle callbacks. When applied to interceptor class methods, lifecycle callbacks work in exactly the same way. Lifecycle callbacks defined in an interceptor class are known as lifecycle callback interceptors or lifecycle callback listeners. When the target bean transitions lifecycles, annotated methods in the interceptor class are triggered. The following interceptor class logs when ActionBazaar beans allocate and release resources when beans instances are constructed and destroyed:

public class ActionBazaarResourceLogger { @PostConstruct public void initialize (InvocationContext context) { System.out.println ("Allocating resources for bean: " + context.getTarget()); context.proceed(); } @PreDestroy public void cleanup (InvocationContext context) { System.out.println ("Releasing resources for bean: " + context.getTarget()); context.proceed(); } }

As the code sample shows, lifecycle interceptor methods cannot throw checked exceptions (it doesn t make sense since there is no client for lifecycle callbacks to bubble a problem up to).

Figure 1-4. Complex SOA solution Figure 1-4 illustrates an architecture in which two separate Web services access the same back-end business components. Each Web service provides a distinct service interface, each of which is suitable for a different type of client. For example, Web Service 1 may provide access to a public, unsecured subset of functions, whereas Web Service 2 provides access to a restricted, secured subset of functions. In addition, Figure 1-4 introduces two new entities that play an important role in complex SOA solutions: Service agent: The service agent manages communications between one service and another, or between a business object and an external service. In doing so, it simplifies those interactions by shielding translation quirks between the consumer and the provider. Business facade: The business facade acts as a trust boundary between incoming service requests (from a client, another service, or a service agent) and the middle-tier business components that service those requests. Let s consider each of these in turn.