Examples with ExponentiallyDecayingReservoir io.dropwizard.metrics.ExponentiallyDecayingReservoir used on opensource projects

Example 1 with ExponentiallyDecayingReservoir

use of io.dropwizard.metrics.ExponentiallyDecayingReservoir in project light-4j by networknt.

the class ExponentiallyDecayingReservoirTest method spotLift.

@Test
public void spotLift() {
    final ManualClock clock = new ManualClock();
    final ExponentiallyDecayingReservoir reservoir = new ExponentiallyDecayingReservoir(1000, 0.015, clock);
    final int valuesRatePerMinute = 10;
    final int valuesIntervalMillis = (int) (TimeUnit.MINUTES.toMillis(1) / valuesRatePerMinute);
    // mode 1: steady regime for 120 minutes
    for (int i = 0; i < 120 * valuesRatePerMinute; i++) {
        reservoir.update(177);
        clock.addMillis(valuesIntervalMillis);
    }
    // switching to mode 2: 10 minutes more with the same rate, but larger value
    for (int i = 0; i < 10 * valuesRatePerMinute; i++) {
        reservoir.update(9999);
        clock.addMillis(valuesIntervalMillis);
    }
    // expect that quantiles should be more about mode 2 after 10 minutes
    assertThat(reservoir.getSnapshot().getMedian()).isEqualTo(9999);
}

Example 2 with ExponentiallyDecayingReservoir

use of io.dropwizard.metrics.ExponentiallyDecayingReservoir in project light-4j by networknt.

the class ExponentiallyDecayingReservoirTest method spotFall.

@Test
public void spotFall() {
    final ManualClock clock = new ManualClock();
    final ExponentiallyDecayingReservoir reservoir = new ExponentiallyDecayingReservoir(1000, 0.015, clock);
    final int valuesRatePerMinute = 10;
    final int valuesIntervalMillis = (int) (TimeUnit.MINUTES.toMillis(1) / valuesRatePerMinute);
    // mode 1: steady regime for 120 minutes
    for (int i = 0; i < 120 * valuesRatePerMinute; i++) {
        reservoir.update(9998);
        clock.addMillis(valuesIntervalMillis);
    }
    // switching to mode 2: 10 minutes more with the same rate, but smaller value
    for (int i = 0; i < 10 * valuesRatePerMinute; i++) {
        reservoir.update(178);
        clock.addMillis(valuesIntervalMillis);
    }
    // expect that quantiles should be more about mode 2 after 10 minutes
    assertThat(reservoir.getSnapshot().get95thPercentile()).isEqualTo(178);
}

Example 3 with ExponentiallyDecayingReservoir

use of io.dropwizard.metrics.ExponentiallyDecayingReservoir in project light-4j by networknt.

the class ExponentiallyDecayingReservoirTest method aReservoirOf100OutOf1000Elements.

@Test
public void aReservoirOf100OutOf1000Elements() throws Exception {
    final ExponentiallyDecayingReservoir reservoir = new ExponentiallyDecayingReservoir(100, 0.99);
    for (int i = 0; i < 1000; i++) {
        reservoir.update(i);
    }
    assertThat(reservoir.size()).isEqualTo(100);
    final Snapshot snapshot = reservoir.getSnapshot();
    assertThat(snapshot.size()).isEqualTo(100);
    assertAllValuesBetween(reservoir, 0, 1000);
}

Example 4 with ExponentiallyDecayingReservoir

use of io.dropwizard.metrics.ExponentiallyDecayingReservoir in project light-4j by networknt.

the class ExponentiallyDecayingReservoirTest method quantiliesShouldBeBasedOnWeights.

@Test
public void quantiliesShouldBeBasedOnWeights() {
    final ManualClock clock = new ManualClock();
    final ExponentiallyDecayingReservoir reservoir = new ExponentiallyDecayingReservoir(1000, 0.015, clock);
    for (int i = 0; i < 40; i++) {
        reservoir.update(177);
    }
    clock.addSeconds(120);
    for (int i = 0; i < 10; i++) {
        reservoir.update(9999);
    }
    assertThat(reservoir.getSnapshot().size()).isEqualTo(50);
    // the first added 40 items (177) have weights 1
    // the next added 10 items (9999) have weights ~6
    // so, it's 40 vs 60 distribution, not 40 vs 10
    assertThat(reservoir.getSnapshot().getMedian()).isEqualTo(9999);
    assertThat(reservoir.getSnapshot().get75thPercentile()).isEqualTo(9999);
}

Example 5 with ExponentiallyDecayingReservoir

use of io.dropwizard.metrics.ExponentiallyDecayingReservoir in project light-4j by networknt.

the class ExponentiallyDecayingReservoirTest method aHeavilyBiasedReservoirOf100OutOf1000Elements.

@Test
public void aHeavilyBiasedReservoirOf100OutOf1000Elements() throws Exception {
    final ExponentiallyDecayingReservoir reservoir = new ExponentiallyDecayingReservoir(1000, 0.01);
    for (int i = 0; i < 100; i++) {
        reservoir.update(i);
    }
    assertThat(reservoir.size()).isEqualTo(100);
    final Snapshot snapshot = reservoir.getSnapshot();
    assertThat(snapshot.size()).isEqualTo(100);
    assertAllValuesBetween(reservoir, 0, 100);
}