/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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 org.apache.curator.framework.imps;
import com.google.common.collect.Queues;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.state.ConnectionState;
import org.apache.curator.framework.state.ConnectionStateListener;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.curator.retry.RetryNTimes;
import org.apache.curator.retry.RetryOneTime;
import org.apache.curator.test.InstanceSpec;
import org.apache.curator.test.TestingCluster;
import org.apache.curator.test.Timing;
import org.apache.curator.utils.CloseableUtils;
import org.testng.Assert;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;
import java.util.Iterator;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
public class TestReadOnly
{
@BeforeMethod
public void setup()
{
System.setProperty("readonlymode.enabled", "true");
}
@AfterMethod
public void tearDown()
{
System.setProperty("readonlymode.enabled", "false");
}
@Test
public void testConnectionStateNewClient() throws Exception
{
Timing timing = new Timing();
TestingCluster cluster = new TestingCluster(3);
CuratorFramework client = null;
try
{
cluster.start();
client = CuratorFrameworkFactory.newClient(cluster.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(100));
client.start();
client.checkExists().forPath("/");
client.close();
client = null;
Iterator<InstanceSpec> iterator = cluster.getInstances().iterator();
for ( int i = 0; i < 2; ++i )
{
cluster.killServer(iterator.next());
}
client = CuratorFrameworkFactory.builder()
.connectString(cluster.getConnectString())
.sessionTimeoutMs(timing.session())
.connectionTimeoutMs(timing.connection())
.retryPolicy(new RetryNTimes(3, timing.milliseconds()))
.canBeReadOnly(true)
.build();
final BlockingQueue<ConnectionState> states = Queues.newLinkedBlockingQueue();
client.getConnectionStateListenable().addListener
(
new ConnectionStateListener()
{
@Override
public void stateChanged(CuratorFramework client, ConnectionState newState)
{
states.add(newState);
}
}
);
client.start();
client.checkExists().forPath("/");
ConnectionState state = states.poll(timing.forWaiting().milliseconds(), TimeUnit.MILLISECONDS);
Assert.assertEquals(state, ConnectionState.READ_ONLY);
}
finally
{
CloseableUtils.closeQuietly(client);
CloseableUtils.closeQuietly(cluster);
}
}
@Test
public void testReadOnly() throws Exception
{
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
{
CloseableUtils.closeQuietly(client);
CloseableUtils.closeQuietly(cluster);
}
}
}