MethodMonitor


1   package jfun.yan.monitoring;
2   
3   import java.lang.reflect.Method  ;
4   /**
5    * <p>
6    * This interface represents something that monitors the invocation of a method.
7    * </p>
8    * @author Michelle Lei
9    *
10   */
11  public interface MethodMonitor {
12    /**
13     * This method is called right before the target method is invoked.
14     * @param obj the object to which the target method belongs.
15     * @param mtd the target method.
16     * @param args the arguments passed to the target method.
17     */
18    void invoking(Object   obj, Method   mtd, Object  [] args);
19    /**
20     * This method is called after the target method is successfully executed.
21     * @param obj the object to which the target method belongs.
22     * @param mtd the target method.
23     * @param args the arguments passed to the target method.
24     * @param result the return value from the target method.
25     * @param duration exactly how long it took to execute the target method. (in milliseconds)
26     */
27    void invoked(Object   obj, Method   mtd, Object  [] args, Object   result, long duration);
28    /**
29     * This method is called after the target method failed.
30     * @param obj the object to which the target method belongs.
31     * @param mtd the target method.
32     * @param args the arguments passed to the target method.
33     * @param err the exception thrown out from the target method.
34     * @param duration exactly how long it took to execute the target method. (in milliseconds)
35     */
36    void invocationFailed(Object   obj, Method   mtd, Object  [] args, Throwable   err, long duration);
37  }
38

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