Interceptor


1   package groovy.lang;
2   
3   /**
4    * Implementers of this interface can be registered in the ProxyMetaClass for
5    * notifications about method calls for objects managed by the ProxyMetaClass.
6    * See groovy/lang/InterceptorTest.groovy for details.
7    * @author Dierk Koenig
8    */
9   public interface Interceptor {
10      /**
11       * This code is executed before the method is optionally called.
12       * @param object        receiver object for the method call
13       * @param methodName    name of the method to call
14       * @param arguments     arguments to the method call
15       * @return any arbitrary result that replaces the result of the
16       * original method call only if doInvoke() returns false and afterInvoke()
17       * relays this result.
18       */
19      Object   beforeInvoke(Object   object, String   methodName, Object  [] arguments);
20      /**
21       * This code is executed after the method is optionally called.
22       * @param object        receiver object for the called method
23       * @param methodName    name of the called method
24       * @param arguments     arguments to the called method
25       * @param result        result of the executed method call or result of beforeInvoke if method was not called
26       * @return any arbitrary result that can replace the result of the
27       * original method call. Typically, the result parameter is returned.
28       */
29      Object   afterInvoke(Object   object, String   methodName, Object  [] arguments, Object   result);
30      /**
31       * @return whether the target method should be invoked at all.
32       */
33      boolean doInvoke();
34  }
35
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