com.linkedin.parseq.zk.client.TestReaper.java Source code

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Here is the source code for com.linkedin.parseq.zk.client.TestReaper.java

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/*
 * Copyright 2016 LinkedIn Corp.
 *
 * Licensed 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 com.linkedin.parseq.zk.client;

import com.linkedin.parseq.BaseEngineTest;
import com.linkedin.parseq.Task;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import junit.framework.Assert;
import org.apache.zookeeper.KeeperException;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

/**
 * @author Ang Xu
 */
public class TestReaper extends BaseEngineTest {

    private Reaper _reaper;

    @BeforeMethod
    public void setUp() throws Exception {
        super.setUp();
        _reaper = new Reaper(getEngine());
    }

    @AfterMethod
    public void tearDown() throws Exception {
        super.tearDown();
    }

    @Test
    public void testReaper() throws InterruptedException {
        final int COUNT = 10;
        final List<Reaper.Zombie> zombies = new ArrayList<>();
        final CountDownLatch latch = new CountDownLatch(COUNT);

        for (int i = 0; i < COUNT; ++i) {
            zombies.add(() -> Task.action("countDown", () -> latch.countDown()));
        }

        zombies.forEach(z -> _reaper.submit(z));
        Assert.assertTrue(latch.await(10, TimeUnit.SECONDS));
    }

    @Test
    public void testReaperRetry() throws InterruptedException {
        final int MAX_RETRY = 3;
        final CountDownLatch failure = new CountDownLatch(MAX_RETRY);
        final CountDownLatch success = new CountDownLatch(1);

        Reaper.Zombie zombie = new Reaper.Zombie() {
            private int count = 0;

            @Override
            public Task<Void> reap() {
                if (count++ < MAX_RETRY) {
                    return Task.action(() -> failure.countDown())
                            .andThen(Task.failure(KeeperException.create(KeeperException.Code.CONNECTIONLOSS)));
                } else {
                    return Task.action(() -> success.countDown());
                }
            }
        };
        _reaper.submit(zombie);

        Assert.assertTrue(failure.await(10, TimeUnit.SECONDS));
        Assert.assertTrue(success.await(10, TimeUnit.SECONDS));
    }
}