/*
 * Copyright 2017 The Netty Project
 *
 * The Netty Project 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.
 */
package io.netty.util.concurrent;

import org.junit.Assert;
import org.junit.Test;

import java.util.concurrent.CountDownLatch;

public class UnorderedThreadPoolEventExecutorTest {

    // See https://github.com/netty/netty/issues/6507
    @Test
    public void testNotEndlessExecute() throws Exception {
        UnorderedThreadPoolEventExecutor executor = new UnorderedThreadPoolEventExecutor(1);

        try {
            final CountDownLatch latch = new CountDownLatch(3);
            Runnable task = new Runnable() {
                @Override
                public void run() {
                    latch.countDown();
                }
            };
            executor.execute(task);
            Future<?> future = executor.submit(task).addListener(new FutureListener<Object>() {
                @Override
                public void operationComplete(Future<Object> future) throws Exception {
                    latch.countDown();
                }
            });
            latch.await();
            future.syncUninterruptibly();

            // Now just check if the queue stays empty multiple times. This is needed as the submit to execute(...)
            // by DefaultPromise may happen in an async fashion
            for (int i = 0; i < 10000; i++) {
                Assert.assertTrue(executor.getQueue().isEmpty());
            }
        } finally {
            executor.shutdownGracefully();
        }
    }
}