FunctionMonitor


1   package jfun.yan.monitoring;
2   
3   import jfun.yan.function.Function;
4   /**
5    * <p>
6    * This interface represents something that monitors the invocation of a function.
7    * </p>
8    * @author Michelle Lei
9    *
10   */
11  public interface FunctionMonitor {
12    /**
13     * This method is called right before the function is called.
14     * @param f the function to be called.
15     * @param args the arguments passed to the function.
16     */
17    void calling(Function f, Object  [] args);
18    /**
19     * This method is called right after the function is called successfully.
20     * @param f the function. 
21     * @param args the arguments passed to the function.
22     * @param result the value returned by the function.
23     * @param duration excactly how long the function call takes. (in milliseconds)
24     */
25    void called(Function f, Object  [] args, Object   result, long duration);
26    /**
27     * This method is called after the function failed.
28     * @param f the function.
29     * @param args the arguments passed to the function.
30     * @param err the exception thrown out of the function.
31     * @param duration exactly how long the function call takes. (in milliseconds)
32     */
33    void callFailed(Function f, Object  [] args, Throwable   err, long duration);
34  }
35

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