GetterMonitor


1   package jfun.yan.monitoring;
2   
3   import java.beans.PropertyDescriptor  ;
4   /**
5    * <p>
6    * This interface represents something that monitors the invocation of a java bean getter.
7    * </p>
8    * @author Michelle Lei
9    *
10   */
11  public interface GetterMonitor {
12    /**
13     * This method is called right before the getter is called.
14     * @param obj the java bean object.
15     * @param desc the descriptor for the property.
16     */
17    void propertyGetting(Object   obj, PropertyDescriptor   desc);
18    /**
19     * This method is called after the getter is called successfully.
20     * @param obj the java bean object.
21     * @param desc the descriptor for the property.
22     * @param result the property value.
23     * @param duration exactly how long it took to run the getter. (in milliseconds)
24     */
25    void propertyGot(Object   obj, PropertyDescriptor   desc, Object   result, long duration);
26    /**
27     * This method is called after the getter failed.
28     * @param obj the java bean object.
29     * @param desc the descriptor for the property.
30     * @param err the exception thrown out of the getter.
31     * @param duration exactly how long it took to run the getter. (in milliseconds)
32     */
33    void propertyGetFailed(Object   obj, PropertyDescriptor   desc, 
34            Throwable   err, long duration);
35  }
36

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