AbstractNanosReservoirTest.java

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package org.glassfish.jersey.server.internal.monitoring;

import java.util.concurrent.TimeUnit;

import static org.junit.Assert.assertEquals;

/**
 * @author Stepan Vavra (stepan.vavra at oracle.com)
 */
public class AbstractNanosReservoirTest {

    protected static final double DELTA = 0.0001;
    protected static final int COLLISION_BUFFER = 256;

    protected void reservoirUpdateInNanos(TimeReservoir reservoir, long value, long time) {
        reservoir.update(value, time, TimeUnit.NANOSECONDS);
    }

    protected void checkInNanos(final TimeReservoir reservoir,
                                final long snapshotTime,
                                final int expectedSize,
                                final int expectedMin,
                                final int expectedMax,
                                final double expectedMean) {
        checkInNanos(reservoir, snapshotTime, expectedSize, expectedMin, expectedMax, expectedMean,
                reservoir.getSnapshot(snapshotTime, TimeUnit.NANOSECONDS).getTimeInterval(TimeUnit.NANOSECONDS));
    }

    /**
     * Checks whether the snapshot of given reservoir exhibits with expected measurements.
     *
     * @param reservoir        The reservoir to assert.
     * @param snapshotTime     The time for which to get the snapshot
     * @param expectedSize     Expected size of the snapshot
     * @param expectedMin      Expected minimum
     * @param expectedMax      Expected maximum
     * @param expectedMean     Expected mean
     * @param expectedInterval Expected interval
     */
    protected void checkInNanos(final TimeReservoir reservoir,
                                final long snapshotTime,
                                final long expectedSize,
                                final long expectedMin,
                                final long expectedMax,
                                final double expectedMean, final long expectedInterval) {
        final UniformTimeSnapshot snapshot = reservoir.getSnapshot(snapshotTime, TimeUnit.NANOSECONDS);

        assertEquals("Total count does not match!", expectedSize, snapshot.size());
        assertEquals("Min exec time does not match!", expectedMin, snapshot.getMin());
        assertEquals("Max exec time does not match!", expectedMax, snapshot.getMax());
        assertEquals("Average exec time does not match!", expectedMean, snapshot.getMean(), DELTA);
        assertEquals("Expected interval does not match!", expectedInterval, snapshot.getTimeInterval(TimeUnit.NANOSECONDS));
    }

}