com.netflix.curator.framework.recipes.shared.TestSharedCount.java Source code

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Here is the source code for com.netflix.curator.framework.recipes.shared.TestSharedCount.java

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/*
 * Copyright 2012 Netflix, Inc.
 *
 *    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.netflix.curator.framework.recipes.shared;

import java.util.List;
import java.util.Random;
import java.util.concurrent.Callable;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

import org.apache.commons.io.IOUtils;
import org.testng.Assert;
import org.testng.annotations.Test;

import com.google.common.collect.Lists;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import com.netflix.curator.framework.CuratorFramework;
import com.netflix.curator.framework.CuratorFrameworkFactory;
import com.netflix.curator.framework.recipes.BaseClassForTests;
import com.netflix.curator.framework.state.ConnectionState;
import com.netflix.curator.retry.RetryOneTime;

public class TestSharedCount extends BaseClassForTests {
    @Test
    public void testMultiClients() throws Exception {
        final int CLIENT_QTY = 5;

        List<Future<List<Integer>>> futures = Lists.newArrayList();
        final List<CuratorFramework> clients = new CopyOnWriteArrayList<CuratorFramework>();
        try {
            final CountDownLatch startLatch = new CountDownLatch(CLIENT_QTY);
            final Semaphore semaphore = new Semaphore(0);
            ExecutorService service = Executors
                    .newCachedThreadPool(new ThreadFactoryBuilder().setNameFormat("Test-%d").build());
            for (int i = 0; i < CLIENT_QTY; ++i) {
                Future<List<Integer>> future = service.submit(new Callable<List<Integer>>() {
                    @Override
                    public List<Integer> call() throws Exception {
                        final List<Integer> countList = Lists.newArrayList();
                        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(),
                                new RetryOneTime(1));
                        clients.add(client);
                        client.start();

                        SharedCount count = new SharedCount(client, "/count", 10);

                        final CountDownLatch latch = new CountDownLatch(1);
                        count.addListener(new SharedCountListener() {
                            @Override
                            public void countHasChanged(SharedCountReader sharedCount, int newCount)
                                    throws Exception {
                                if (newCount < 0) {
                                    latch.countDown();
                                } else {
                                    countList.add(newCount);
                                }

                                semaphore.release();
                            }

                            @Override
                            public void stateChanged(CuratorFramework client, ConnectionState newState) {
                            }
                        });
                        count.start();
                        startLatch.countDown();
                        latch.await();
                        return countList;
                    }
                });
                futures.add(future);
            }

            CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(),
                    new RetryOneTime(1));
            clients.add(client);
            client.start();

            Assert.assertTrue(startLatch.await(10, TimeUnit.SECONDS));

            SharedCount count = new SharedCount(client, "/count", 10);
            count.start();

            List<Integer> countList = Lists.newArrayList();
            Random random = new Random();
            for (int i = 0; i < 100; ++i) {
                Thread.sleep(random.nextInt(10));

                int next = random.nextInt(100);
                countList.add(next);
                count.setCount(next);

                Assert.assertTrue(semaphore.tryAcquire(CLIENT_QTY, 10, TimeUnit.SECONDS));
            }
            count.setCount(-1);

            for (Future<List<Integer>> future : futures) {
                List<Integer> thisCountList = future.get();
                Assert.assertEquals(thisCountList, countList);
            }
        } finally {
            for (CuratorFramework client : clients) {
                IOUtils.closeQuietly(client);
            }
        }
    }

    @Test
    public void testSimple() throws Exception {
        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1));
        client.start();
        try {
            SharedCount count = new SharedCount(client, "/count", 0);
            count.start();

            Assert.assertTrue(count.trySetCount(1));
            Assert.assertTrue(count.trySetCount(2));
            Assert.assertTrue(count.trySetCount(10));
            Assert.assertEquals(count.getCount(), 10);
        } finally {
            client.close();
        }
    }
}