Class DelegatingIntroductionInterceptor

All Implemented Interfaces:
Serializable, Advice, Interceptor, MethodInterceptor, DynamicIntroductionAdvice, IntroductionInfo, IntroductionInterceptor

public class DelegatingIntroductionInterceptor extends IntroductionInfoSupport implements IntroductionInterceptor
Convenient implementation of the IntroductionInterceptor interface.

Subclasses merely need to extend this class and implement the interfaces to be introduced themselves. In this case the delegate is the subclass instance itself. Alternatively a separate delegate may implement the interface, and be set via the delegate bean property.

Delegates or subclasses may implement any number of interfaces. All interfaces except IntroductionInterceptor are picked up from the subclass or delegate by default.

The suppressInterface method can be used to suppress interfaces implemented by the delegate but which should not be introduced to the owning AOP proxy.

An instance of this class is serializable if the delegate is.

Rod Johnson, Juergen Hoeller
See Also:
  • Constructor Details

    • DelegatingIntroductionInterceptor

      public DelegatingIntroductionInterceptor(Object delegate)
      Construct a new DelegatingIntroductionInterceptor, providing a delegate that implements the interfaces to be introduced.
      delegate - the delegate that implements the introduced interfaces
    • DelegatingIntroductionInterceptor

      protected DelegatingIntroductionInterceptor()
      Construct a new DelegatingIntroductionInterceptor. The delegate will be the subclass, which must implement additional interfaces.
  • Method Details

    • invoke

      @Nullable public Object invoke(MethodInvocation mi) throws Throwable
      Subclasses may need to override this if they want to perform custom behaviour in around advice. However, subclasses should invoke this method, which handles introduced interfaces and forwarding to the target.
      Specified by:
      invoke in interface MethodInterceptor
      mi - the method invocation joinpoint
      the result of the call to Joinpoint.proceed(); might be intercepted by the interceptor
      Throwable - if the interceptors or the target object throws an exception
    • doProceed

      @Nullable protected Object doProceed(MethodInvocation mi) throws Throwable
      Proceed with the supplied MethodInterceptor. Subclasses can override this method to intercept method invocations on the target object which is useful when an introduction needs to monitor the object that it is introduced into. This method is never called for MethodInvocations on the introduced interfaces.