SortedServiceReferenceListTest.java

/**
 * Copyright (c) Codice Foundation
 * <p/>
 * This is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser
 * General Public License as published by the Free Software Foundation, either version 3 of the
 * License, or any later version.
 * <p/>
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details. A copy of the GNU Lesser General Public License
 * is distributed along with this program and can be found at
 * <http://www.gnu.org/licenses/lgpl.html>.
 */
package ddf.catalog.util.impl;

import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.lessThanOrEqualTo;
import static org.junit.Assert.assertThat;

import java.util.Random;

import org.junit.Test;
import org.osgi.framework.Constants;
import org.osgi.framework.ServiceReference;
import org.slf4j.LoggerFactory;
import org.slf4j.ext.XLogger;

public class SortedServiceReferenceListTest {

    private static XLogger logger = new XLogger(
            LoggerFactory.getLogger(SortedServiceReferenceListTest.class));

    @Test
    public void testAscending() {

        SortedServiceReferenceList refList = new SortedServiceReferenceList();

        int loopAmount = 100;

        for (int i = 0; i < loopAmount; i++) {
            refList.bindService(new ServiceReferenceImpl(i));
        }

        assertThat(refList.size(), is(loopAmount));

        assertInOrder(refList, loopAmount);

    }

    @Test
    public void testDescending() {

        SortedServiceReferenceList refList = new SortedServiceReferenceList();

        int loopAmount = 100;

        for (int i = loopAmount; i > 0; i--) {
            refList.bindService(new ServiceReferenceImpl(i));
        }

        assertThat(refList.size(), is(loopAmount));

        assertInOrder(refList, loopAmount);

    }

    @Test
    public void testRandomOrder() {

        SortedServiceReferenceList refList = new SortedServiceReferenceList();

        int loopAmount = 100;

        Random random = new Random(System.currentTimeMillis());

        for (int i = 0; i < loopAmount; i++) {
            refList.bindService(new ServiceReferenceImpl(random.nextInt()));
        }

        assertThat(refList.size(), is(loopAmount));

        assertInOrder(refList, Integer.MAX_VALUE);

    }

    protected void assertInOrder(SortedServiceReferenceList refList, int startingLowestRank) {
        int lowestRanking = startingLowestRank;

        for (ServiceReference s : refList) {

            Integer ranking = (Integer) s.getProperty(Constants.SERVICE_RANKING);
            logger.info(
                    "service is ranked [" + ranking + "], lowest current ranking [" + lowestRanking
                            + "]");
            assertThat(ranking, lessThanOrEqualTo(lowestRanking));

            lowestRanking = ranking;
        }
    }

}