com.netflix.curator.framework.imps.TestWithCluster.java Source code

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Here is the source code for com.netflix.curator.framework.imps.TestWithCluster.java

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/*
 *
 *  Copyright 2011 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.imps;

import java.util.Iterator;
import java.util.concurrent.CountDownLatch;

import org.apache.commons.io.IOUtils;
import org.apache.zookeeper.CreateMode;
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.framework.state.ConnectionState;
import com.netflix.curator.framework.state.ConnectionStateListener;
import com.netflix.curator.retry.ExponentialBackoffRetry;
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 TestWithCluster {
    @Test
    public void testReadOnly() throws Exception {
        System.setProperty("readonlymode.enabled", "true");
        try {
            Timing timing = new Timing();

            CuratorFramework client = null;
            TestingCluster cluster = new TestingCluster(2);
            try {
                cluster.start();

                client = CuratorFrameworkFactory.builder().connectString(cluster.getConnectString())
                        .canBeReadOnly(true).connectionTimeoutMs(timing.connection())
                        .sessionTimeoutMs(timing.session()).retryPolicy(new ExponentialBackoffRetry(100, 3))
                        .build();
                client.start();

                client.create().forPath("/test");

                final CountDownLatch readOnlyLatch = new CountDownLatch(1);
                final CountDownLatch reconnectedLatch = new CountDownLatch(1);
                ConnectionStateListener listener = new ConnectionStateListener() {
                    @Override
                    public void stateChanged(CuratorFramework client, ConnectionState newState) {
                        if (newState == ConnectionState.READ_ONLY) {
                            readOnlyLatch.countDown();
                        } else if (newState == ConnectionState.RECONNECTED) {
                            reconnectedLatch.countDown();
                        }
                    }
                };
                client.getConnectionStateListenable().addListener(listener);

                InstanceSpec ourInstance = cluster
                        .findConnectionInstance(client.getZookeeperClient().getZooKeeper());
                Iterator<InstanceSpec> iterator = cluster.getInstances().iterator();
                InstanceSpec killInstance = iterator.next();
                if (killInstance.equals(ourInstance)) {
                    killInstance = iterator.next(); // kill the instance we're not connected to
                }
                cluster.killServer(killInstance);

                Assert.assertEquals(reconnectedLatch.getCount(), 1);
                Assert.assertTrue(timing.awaitLatch(readOnlyLatch));

                Assert.assertEquals(reconnectedLatch.getCount(), 1);
                cluster.restartServer(killInstance);
                Assert.assertTrue(timing.awaitLatch(reconnectedLatch));
            } finally {
                IOUtils.closeQuietly(client);
                IOUtils.closeQuietly(cluster);
            }
        } finally {
            System.clearProperty("readonlymode.enabled");
        }
    }

    @Test
    public void testSessionSurvives() throws Exception {
        Timing timing = new Timing();

        CuratorFramework client = null;
        TestingCluster cluster = new TestingCluster(3);
        cluster.start();
        try {
            client = CuratorFrameworkFactory.newClient(cluster.getConnectString(), timing.session(),
                    timing.connection(), new ExponentialBackoffRetry(100, 3));
            client.start();

            client.create().withMode(CreateMode.EPHEMERAL).forPath("/temp", "value".getBytes());
            Assert.assertNotNull(client.checkExists().forPath("/temp"));

            for (InstanceSpec spec : cluster.getInstances()) {
                cluster.killServer(spec);
                timing.forWaiting().sleepABit();
                cluster.restartServer(spec);
                timing.sleepABit();
            }

            timing.sleepABit();
            Assert.assertNotNull(client.checkExists().forPath("/temp"));
        } finally {
            IOUtils.closeQuietly(client);
            IOUtils.closeQuietly(cluster);
        }
    }

    @Test
    public void testSplitBrain() throws Exception {
        Timing timing = new Timing();

        CuratorFramework client = null;
        TestingCluster cluster = new TestingCluster(3);
        cluster.start();
        try {
            // make sure all instances are up
            for (InstanceSpec instanceSpec : cluster.getInstances()) {
                client = CuratorFrameworkFactory.newClient(instanceSpec.getConnectString(), new RetryOneTime(1));
                client.start();
                client.checkExists().forPath("/");
                client.close();
                client = null;
            }

            client = CuratorFrameworkFactory.newClient(cluster.getConnectString(), timing.session(),
                    timing.connection(), new RetryOneTime(1));
            client.start();

            final CountDownLatch latch = new CountDownLatch(2);
            client.getConnectionStateListenable().addListener(new ConnectionStateListener() {
                @Override
                public void stateChanged(CuratorFramework client, ConnectionState newState) {
                    if ((newState == ConnectionState.SUSPENDED) || (newState == ConnectionState.LOST)) {
                        latch.countDown();
                    }
                }
            });

            client.checkExists().forPath("/");

            for (InstanceSpec instanceSpec : cluster.getInstances()) {
                if (!instanceSpec
                        .equals(cluster.findConnectionInstance(client.getZookeeperClient().getZooKeeper()))) {
                    Assert.assertTrue(cluster.killServer(instanceSpec));
                }
            }

            Assert.assertTrue(timing.awaitLatch(latch));
        } finally {
            IOUtils.closeQuietly(client);
            IOUtils.closeQuietly(cluster);
        }
    }
}