## org.springframework.aop.support
Class DelegatePerTargetObjectIntroductionInterceptor

    java.lang.Object
      org.springframework.aop.support.IntroductionInfoSupport
          org.springframework.aop.support.DelegatePerTargetObjectIntroductionInterceptor

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

    public class DelegatePerTargetObjectIntroductionInterceptor

extends IntroductionInfoSupport
implements IntroductionInterceptor

Convenient implementation of the `IntroductionInterceptor` interface.

This differs from `DelegatingIntroductionInterceptor` in that a single instance of this class can be used to advise multiple target objects, and each target object will have its own delegate (whereas DelegatingIntroductionInterceptor shares the same delegate, and hence the same state across all targets).

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

An instance of this class is serializable if the delegates are.

Note: There are some implementation similarities between this class and `DelegatingIntroductionInterceptor` that suggest a possible refactoring to extract a common ancestor class in the future.

Since:
  2.0
Author:
  Adrian Colyer, Juergen Hoeller
See Also:
  `IntroductionInfoSupport.suppressInterface(java.lang.Class)`, `DelegatingIntroductionInterceptor`, Serialized Form

Field Summary

Fields inherited from class org.springframework.aop.support.IntroductionInfoSupport
`logger, publishedInterfaces`

Constructor Summary
`DelegatePerTargetObjectIntroductionInterceptor(Class defaultImplType, Class interfaceType)`

Method Summary
`protected Object` `doProceed(MethodInvocation mi)` Proceed with the supplied `MethodInterceptor`.
`Object` `invoke(MethodInvocation mi)` Subclasses may need to override this if they want to perform custom behaviour in around advice.

Methods inherited from class org.springframework.aop.support.IntroductionInfoSupport
`getInterfaces, implementInterfacesOnObject, implementsInterface, isMethodOnIntroducedInterface, suppressInterface`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface org.springframework.aop.DynamicIntroductionAdvice
`implementsInterface`

Constructor Detail

### DelegatePerTargetObjectIntroductionInterceptor

    public DelegatePerTargetObjectIntroductionInterceptor(Class defaultImplType,
                                                          Class interfaceType)

Method Detail

### invoke

    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`
  Throws:
    `Throwable`

### doProceed

    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.

  Throws:
    `Throwable`

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