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I want to use interceptors in a Java-SE application and I am using weld as CDI implementation and i'm testing this here:
The Main-Class:
public static void main(String[] args) {
WeldContainer weldContainer = new Weld().initialize();
Service service = weldContainer.instance().select(Service.class).get();
service.methodCall();
service.methodCallNumberTwo();
}
The Service-Class:
public class Service {
@TestAnnotation
public void methodCall(){
System.out.println("methodCall...!");
methodCallNumberTwo();
}
@TestAnnotation
public void methodCallNumberTwo(){
System.out.println("methodCallNumberTwo...!");
}
}
The Interceptor-Class:
@Interceptor
@TestAnnotation
public class TestInterceptor {
@AroundInvoke
public Object interceptorMethod(InvocationContext invocationContext) throws Exception {
System.out.println("I'm the TestInterceptor of "+invocationContext.getMethod());
return invocationContext.proceed();
}
}
Aaaand the output:
I'm the TestInterceptor of public void Service.methodCall()
methodCall...!
methodCallNumberTwo...!
I'm the TestInterceptor of public void Service.methodCallNumberTwo()
methodCallNumberTwo...!
My Questions
First: Why isn't the interceptor called in methodCall() when i'm calling methodCallNumberTwo()?
Second: Is there a way to change that?
I'm only studying the behavior of interceptors and want to understand. Thank you in advance!
645
Use the @AroundInvoke annotation to designate interceptor methods for managed object methods. Only one around-invoke interceptor method per class is allowed. Around-invoke interceptor methods have the following form: @AroundInvoke visibility Object method-name(InvocationContext) throws Exception { ... }
An interceptor is defined using one of the interceptor metadata annotations listed in Table 50-1 within the target class, or in a separate interceptor class. The following code declares an @AroundTimeout interceptor method within a target class. @Stateless public class TimerBean { ...
Interceptors are used in conjunction with Java EE managed classes to allow developers to invoke interceptor methods on an associated target class, in conjunction with method invocations or lifecycle events. Common uses of interceptors are logging, auditing, and profiling.
An interceptor is a class used to interpose in method invocations or lifecycle events that occur in an associated target class. The interceptor performs tasks, such as logging or auditing, that are separate from the business logic of the application and are repeated often within an application.
The interceptor is not called because you are calling it on the same instance of the object. If you're familiar with EJBs it's the same as calling a method on the same object instead of through the EJB context.
If you debug through it you'll notic that the method call on the injected objects goes through a proxy. The method call from methodOne to methodTwo isn't proxied.
149
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