java方法设置切点_Spring AOP 多个切点实现:JdkDynamicAopProxy

太过爱你忘了你带给我的痛 2022-11-08 11:25 17阅读 0赞

1 /\*\*

2 \* Implementation of `InvocationHandler.invoke`.3 \*

Callers will see exactly the exception thrown by the target,4 \* unless a hook method throws an exception.5 \*/

6 public Object invoke(Object proxy, Method method, Object\[\] args) throwsThrowable \{7 MethodInvocation invocation;8 Object oldProxy = null;9 boolean setProxyContext = false;10

11 TargetSource targetSource = this.advised.targetSource;12 Class targetClass = null;13 Object target = null;14

15 try\{16 if (!this.equalsDefined &&AopUtils.isEqualsMethod(method)) \{17 //The target does not implement the equals(Object) method itself.

18 return equals(args\[0\]);19 \}20 if (!this.hashCodeDefined &&AopUtils.isHashCodeMethod(method)) \{21 //The target does not implement the hashCode() method itself.

22 returnhashCode();23 \}24 if (!this.advised.opaque && method.getDeclaringClass().isInterface() &&

25 method.getDeclaringClass().isAssignableFrom(Advised.class)) \{26 //Service invocations on ProxyConfig with the proxy config...

27 return AopUtils.invokeJoinpointUsingReflection(this.advised, method, args);28 \}29

30 Object retVal;31

32 if (this.advised.exposeProxy) \{33 //Make invocation available if necessary.

34 oldProxy =AopContext.setCurrentProxy(proxy);35 setProxyContext = true;36 \}37

38 //May be null. Get as late as possible to minimize the time we "own" the target,39 //in case it comes from a pool.

40 target =targetSource.getTarget();41 if (target != null) \{42 targetClass =target.getClass();43 \}44

45 //Get the interception chain for this method.

46 List chain = this.advised.getInterceptorsAndDynamicInterceptionAdvice(method, targetClass);47

48 //Check whether we have any advice. If we don't, we can fallback on direct49 //reflective invocation of the target, and avoid creating a MethodInvocation.

50 if(chain.isEmpty()) \{51 //We can skip creating a MethodInvocation: just invoke the target directly52 //Note that the final invoker must be an InvokerInterceptor so we know it does53 //nothing but a reflective operation on the target, and no hot swapping or fancy proxying.

54 retVal =AopUtils.invokeJoinpointUsingReflection(target, method, args);55 \}56 else\{57 //We need to create a method invocation...

58 invocation = new ReflectiveMethodInvocation(proxy, target, method, args, targetClass, chain);59 //Proceed to the joinpoint through the interceptor chain.

60 retVal = invocation.proceed();61 \}62

63 //Massage return value if necessary.

64 if (retVal != null && retVal == target && method.getReturnType().isInstance(proxy) &&

65 !RawTargetAccess.class.isAssignableFrom(method.getDeclaringClass())) \{66 //Special case: it returned "this" and the return type of the method67 //is type-compatible. Note that we can't help if the target sets68 //a reference to itself in another returned object.

69 retVal =proxy;70 \}71 returnretVal;72 \}73 finally\{74 if (target != null && !targetSource.isStatic()) \{75 //Must have come from TargetSource.

76 targetSource.releaseTarget(target);77 \}78 if(setProxyContext) \{79 //Restore old proxy.

80 AopContext.setCurrentProxy(oldProxy);81 \}82 \}83 \}