Examples of hirondelle.web4j.webmaster.PerformanceSnapshot

hirondelle.web4j.webmaster.PerformanceSnapshot

Statistics on server response time.

This class uses the metaphor of a 'photographic exposure' of, say, 10 minutes, whereby response times for a specific time interval are grouped together in a single bin, and average and maximum response times for that interval are derived for that group.

A particular PerformanceSnapshot is used only if its 'exposure time' has not yet ended. A typical 'exposure' lasts a few minutes. (See {@link hirondelle.web4j.webmaster.PerformanceMonitor} and the web.xml of the example application for more information.) By inspecting the return value of {@link #getEndTime}, the caller determines if a PerformanceSnapshot object can still be used, or if a new PerformanceSnapshot object must be created for the 'next exposure'.

This class is immutable. In particular, {@link #addResponseTime} returns a new object, instead of changing the state of an existing one.

  public void testCtor(){
    assertState(fSnapshot, EXPOSURE_TIME.intValue(), 0, 0, 0, Consts.EMPTY_STRING);
  }


  public void testAddResponses() {
    PerformanceSnapshot snapshot1 = fSnapshot.addResponseTime(1000, URL);
    assertState(snapshot1, EXPOSURE_TIME.intValue(), 1, 1000, 1000, URL);
    
    PerformanceSnapshot snapshot2 = snapshot1.addResponseTime(3000, URL);
    assertState(snapshot2, EXPOSURE_TIME.intValue(), 2, 3000, 2000, URL);
    
    PerformanceSnapshot snapshot3 = snapshot2.addResponseTime(1000, URL);
    assertState(snapshot3, EXPOSURE_TIME.intValue(), 3, 3000, 1666, URL);
    
    PerformanceSnapshot snapshot4 = snapshot3.addResponseTime(6000, MAX_URL);
    assertState(snapshot4, EXPOSURE_TIME.intValue(), 4, 6000, 2749, MAX_URL);
  }

   each test, such that the tests will always start with the same
   set of test objects, and the execution of one test will not interfere
   with the execution of another.
  */
  protected void setUp(){
    fSnapshot = new PerformanceSnapshot(EXPOSURE_TIME);
  }

Examples of hirondelle.web4j.webmaster.PerformanceSnapshot

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