test/unit/org/apache/cassandra/concurrent/DebuggableThreadPoolExecutorTest.java

package org.apache.cassandra.concurrent;
/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 */


import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;

import org.junit.Test;

import org.apache.cassandra.utils.WrappedRunnable;

public class DebuggableThreadPoolExecutorTest
{
    @Test
    public void testSerialization()
    {
        LinkedBlockingQueue<Runnable> q = new LinkedBlockingQueue<Runnable>(1);
        DebuggableThreadPoolExecutor executor = new DebuggableThreadPoolExecutor(1,
                                                                                 Integer.MAX_VALUE,
                                                                                 TimeUnit.MILLISECONDS,
                                                                                 q,
                                                                                 new NamedThreadFactory("TEST"));
        WrappedRunnable runnable = new WrappedRunnable()
        {
            public void runMayThrow() throws InterruptedException
            {
                Thread.sleep(50);
            }
        };
        long start = System.nanoTime();
        for (int i = 0; i < 10; i++)
        {
            executor.execute(runnable);
        }
        assert q.size() > 0 : q.size();
        while (executor.getCompletedTaskCount() < 10)
            continue;
        long delta = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - start);
        assert delta >= 9 * 50 : delta;
    }
}