jetty-util/src/test/java/org/eclipse/jetty/util/DateCacheTest.java

//
//  ========================================================================
//  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.util;


import java.util.Locale;
import java.util.TimeZone;
import java.util.concurrent.TimeUnit;

import org.eclipse.jetty.toolchain.test.AdvancedRunner;
import org.eclipse.jetty.toolchain.test.annotation.Slow;
import org.hamcrest.Matchers;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;


/**
 * Util meta Tests.
 */
@RunWith(AdvancedRunner.class)
public class DateCacheTest
{
    /* ------------------------------------------------------------ */
    @Test
    @Slow
    public void testDateCache() throws Exception
    {
        //@WAS: Test t = new Test("org.eclipse.jetty.util.DateCache");
        //                            012345678901234567890123456789
        DateCache dc = new DateCache("EEE, dd MMM yyyy HH:mm:ss zzz ZZZ",Locale.US,TimeZone.getTimeZone("GMT"));

        Thread.sleep(2000);

        long now=System.currentTimeMillis();
        long end=now+3000;
        String f=dc.formatNow(now);
        String last=f;

        int hits=0;
        int misses=0;

        while (now<end)
        {
            last=f;
            f=dc.formatNow(now);
            // System.err.printf("%s %s%n",f,last==f);
            if (last==f)
                hits++;
            else
                misses++;

            TimeUnit.MILLISECONDS.sleep(100);
            now=System.currentTimeMillis();
        }
        Assert.assertThat(hits,Matchers.greaterThan(misses));
    }
}