Examples of net.sourceforge.stat4j.Metric

net.sourceforge.stat4j.Metric
Name: Metric.java Date: Aug 29, 2004 Description: A metric is collected from a log either at a point in time (single reading) or over 2 points in time (dual reading). A dual reading enables deltas such as durations and memory usage to be calculated. A metric will only be generated for a statsictic if the log message matches the statistic filter. The filter also defines an optional expression for scaping user defined values from the log. A reading holds the time,free memory and a user defined value for a point in time. Typically metrics that require dual readings will be cached for the first reading and then sent to the statstic calculator once the second reading has been captured. The statistic defines the filters for each reading. Calculators may override caching by setting setApplyImmediate to true. RunningTotals are examples of calculators that must be sent metrics when a match occurs on either statisitic filter. Metrics may be collected across all threads or locally within a given thread (thread local). This is so that we can support metrics for a given call stack such as method duration and global metrics such as average user session duration. @see Filter @see Reading @see Calculator @see Statistic value scraped from the log taken at one or 2 points in time @author Lara D'Abreo

        generateReading(statistic, statistic.getSecond(), log);
      if (reading == null)
        continue;


      if (calculator.isApplyImmediate()) {
        Metric metric = new Metric(statistic.getName(), null, reading);
        calculateStatistic(calculator, metric);


      } else {
        matchReading(statistic, calculator, reading);
      }

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        generateReading(statistic, statistic.getFirst(), log);
      if (reading == null)
        continue;


      if (calculator.isApplyImmediate()) {
        Metric metric = new Metric(statistic.getName(), reading);
        calculateStatistic(calculator, metric);


      } else {
        cacheReading(statistic, reading);
      }

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    Reading first = (Reading) cache.get(statistic.getName());


    // found match to this reading
    if (first != null) {
      // generate metric
      Metric metric = new Metric(statistic.getName(), first, reading);
      calculateStatistic(calculator, metric);
      
      // clear first reading from cache 
      // ready to collect again
      cache.remove(statistic.getName());

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    }




    public void testShouldAccumulateOccurrences() throws Exception {


        Metric metric = new Metric("metric", new Reading());


        for (int i = 0; i < 5; i++) {
            rate.applyMetric(metric);
        }

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    public void testShouldResetWhenLivingLongerThenItsPeriod() throws Exception {


        long timePeriodPlusOne = rate.starttimestamp + rate.period + 1;


        Reading reading = new SettableReading().withTimestamp(timePeriodPlusOne);
        Metric muchYoungerMetric = new Metric("metric", reading);


        // Old period's readings
        Metric oldMetric = new Metric("metric", new Reading());
        rate.applyMetric(oldMetric);
        assertEquals(1, (int) rate.getResult());


        // Force new period by pretending a measure from far future
        rate.applyMetric(muchYoungerMetric);

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Related Classes of net.sourceforge.stat4j.Metric

net.sourceforge.stat4j.calculators.RunningRateTest

net.sourceforge.stat4j.filter.MetricCollector

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