com.netflix.curator.framework.recipes.cache.TestPathChildrenCacheInCluster.java Source code

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Here is the source code for com.netflix.curator.framework.recipes.cache.TestPathChildrenCacheInCluster.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.cache;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;

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

import com.netflix.curator.framework.CuratorFramework;
import com.netflix.curator.framework.CuratorFrameworkFactory;
import com.netflix.curator.retry.RetryOneTime;
import com.netflix.curator.test.InstanceSpec;
import com.netflix.curator.test.TestingCluster;
import com.netflix.curator.test.Timing;

public class TestPathChildrenCacheInCluster {
    @Test
    public void testServerLoss() throws Exception {
        Timing timing = new Timing();

        CuratorFramework client = null;
        PathChildrenCache cache = null;
        TestingCluster cluster = new TestingCluster(3);
        try {
            cluster.start();

            client = CuratorFrameworkFactory.newClient(cluster.getConnectString(), timing.session(),
                    timing.connection(), new RetryOneTime(1));
            client.start();
            client.create().creatingParentsIfNeeded().forPath("/test");

            cache = new PathChildrenCache(client, "/test", false);
            cache.start();

            final CountDownLatch resetLatch = new CountDownLatch(1);
            final CountDownLatch reconnectLatch = new CountDownLatch(1);
            final AtomicReference<CountDownLatch> latch = new AtomicReference<CountDownLatch>(
                    new CountDownLatch(3));
            cache.getListenable().addListener(new PathChildrenCacheListener() {
                @Override
                public void childEvent(CuratorFramework client, PathChildrenCacheEvent event) throws Exception {
                    if (event.getType() == PathChildrenCacheEvent.Type.CONNECTION_SUSPENDED) {
                        resetLatch.countDown();
                    } else if (event.getType() == PathChildrenCacheEvent.Type.CONNECTION_RECONNECTED) {
                        reconnectLatch.countDown();
                    } else if (event.getType() == PathChildrenCacheEvent.Type.CHILD_ADDED) {
                        latch.get().countDown();
                    }
                }
            });

            client.create().forPath("/test/one");
            client.create().forPath("/test/two");
            client.create().forPath("/test/three");

            Assert.assertTrue(latch.get().await(10, TimeUnit.SECONDS));

            InstanceSpec connectionInstance = cluster
                    .findConnectionInstance(client.getZookeeperClient().getZooKeeper());
            cluster.killServer(connectionInstance);

            Assert.assertTrue(timing.awaitLatch(reconnectLatch));

            Assert.assertEquals(cache.getCurrentData().size(), 3);
        } finally {
            IOUtils.closeQuietly(cache);
            IOUtils.closeQuietly(client);
            IOUtils.closeQuietly(cluster);
        }
    }
}