org.dcache.util.histograms.CountingHistogramTest.java Source code

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/*
COPYRIGHT STATUS:
Dec 1st 2001, Fermi National Accelerator Laboratory (FNAL) documents and
software are sponsored by the U.S. Department of Energy under Contract No.
DE-AC02-76CH03000. Therefore, the U.S. Government retains a  world-wide
non-exclusive, royalty-free license to publish or reproduce these documents
and software for U.S. Government purposes.  All documents and software
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Redistribution and/or modification of the software shall be accompanied
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notice).
    
The user is asked to feed back problems, benefits, and/or suggestions
about the software to the Fermilab Software Providers.
    
Neither the name of Fermilab, the  URA, nor the names of the contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
    
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED  WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED  WARRANTIES OF MERCHANTABILITY AND FITNESS
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OR THE URA, OR THE U.S. DEPARTMENT of ENERGY, OR CONTRIBUTORS BE LIABLE
FOR  ANY  DIRECT, INDIRECT,  INCIDENTAL, SPECIAL, EXEMPLARY, OR
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This software is provided by URA, independent from its Prime Contract
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 */
package org.dcache.util.histograms;

import org.apache.commons.math3.util.FastMath;
import org.junit.Test;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

import static junit.framework.TestCase.assertEquals;
import static junit.framework.TestCase.assertNotNull;

public final class CountingHistogramTest extends HistogramModelTest {
    @Test
    public void binUnitShouldBe1ForMaxValue50Days() throws Exception {
        givenCountingHistogram();
        givenFilelifetimeValuesFor(50);
        givenBinCountOf(51);
        givenBinUnitOf((double) TimeUnit.DAYS.toMillis(1));
        givenBinLabelOf(TimeUnit.DAYS.name());
        givenDataLabelOf("COUNT");
        givenHistogramTypeOf("File Lifetime Count");
        whenConfigureIsCalled();
        assertThatBuildSucceeded();
        assertThatBinWidthIs(1);
    }

    @Test
    public void binUnitShouldBe2ForMaxValue100Days() throws Exception {
        givenCountingHistogram();
        givenFilelifetimeValuesFor(100);
        givenBinCountOf(51);
        givenBinUnitOf((double) TimeUnit.DAYS.toMillis(1));
        givenBinLabelOf(TimeUnit.DAYS.name());
        givenDataLabelOf("COUNT");
        givenHistogramTypeOf("File Lifetime Count");
        whenConfigureIsCalled();
        assertThatBuildSucceeded();
        assertThatBinWidthIs(2);
    }

    @Test
    public void binUnitShouldBe3ForMaxValue101Days() throws Exception {
        givenCountingHistogram();
        givenFilelifetimeValuesFor(101);
        givenBinCountOf(51);
        givenBinUnitOf((double) TimeUnit.DAYS.toMillis(1));
        givenBinLabelOf(TimeUnit.DAYS.name());
        givenDataLabelOf("COUNT");
        givenHistogramTypeOf("File Lifetime Count");
        whenConfigureIsCalled();
        assertThatBuildSucceeded();
        assertThatBinWidthIs(3);
    }

    @Test
    public void buildShouldFailWhenNoCountGivenToCounting() throws Exception {
        givenCountingHistogram();
        givenFilelifetimeValuesFor(150);
        givenBinUnitOf((double) TimeUnit.DAYS.toMillis(1));
        givenBinLabelOf(TimeUnit.DAYS.name());
        givenDataLabelOf("COUNT");
        givenHistogramTypeOf("File Lifetime Count");
        whenConfigureIsCalled();
        assertThatBuildFailed();
    }

    @Test
    public void buildShouldFailWhenNoDataGivenToCountingHistogram() throws Exception {
        givenCountingHistogram();
        whenConfigureIsCalled();
        assertThatBuildFailed();
    }

    @Test
    public void buildShouldFailWhenNoUnitGivenToCountingHistogram() throws Exception {
        givenCountingHistogram();
        givenFilelifetimeValuesFor(150);
        givenBinCountOf(51);
        givenBinLabelOf(TimeUnit.DAYS.name());
        givenDataLabelOf("COUNT");
        givenHistogramTypeOf("File Lifetime Count");
        whenConfigureIsCalled();
        assertThatBuildFailed();
    }

    private void assertThatBinWidthIs(int numUnits) {
        assertEquals("wrong binWidth", numUnits, (int) model.binWidth);
    }

    private void assertThatBuildFailed() {
        assertNotNull("Build succeeded but should have failed", error);
        model = null;
    }

    private List<Double> getRawLifetimes(int days) {
        List<Double> lifetimes = new ArrayList<>();
        long radix = TimeUnit.DAYS.toMillis(days);
        /*
         *  Ensure that the max is there so
         *  the assertion always works, regardless
         *  of the other random values.
         */
        lifetimes.add((double) radix);
        for (int i = 1; i < days; ++i) {
            long duration = FastMath.abs(RANDOM.nextLong()) % radix;
            lifetimes.add((double) duration);
        }
        return lifetimes;
    }

    private void givenCountingHistogram() {
        if (model == null) {
            model = new CountingHistogram();
        } else {
            model = new CountingHistogram((CountingHistogram) model);
        }
    }

    private void givenFilelifetimeValuesFor(int units) {
        model.setData(getRawLifetimes(units));
    }
}