package org.apache.helix.manager.zk;
/*
* 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.
*/
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import org.apache.helix.HelixDataAccessor;
import org.apache.helix.HelixManager;
import org.apache.helix.HelixManagerFactory;
import org.apache.helix.InstanceType;
import org.apache.helix.LiveInstanceChangeListener;
import org.apache.helix.NotificationContext;
import org.apache.helix.PropertyKey;
import org.apache.helix.ZkUnitTestBase;
import org.apache.helix.manager.zk.ZNRecordSerializer;
import org.apache.helix.manager.zk.ZkClient;
import org.apache.helix.model.LiveInstance;
import org.apache.helix.tools.ClusterSetup;
import org.testng.Assert;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;
public class TestZKLiveInstanceData extends ZkUnitTestBase
{
private final String clusterName = CLUSTER_PREFIX + "_" + getShortClassName();
@Test
public void testDataChange() throws Exception
{
// Create an admin and add LiveInstanceChange listener to it
HelixManager adminManager =
HelixManagerFactory.getZKHelixManager(clusterName,
null,
InstanceType.ADMINISTRATOR,
ZK_ADDR);
adminManager.connect();
final BlockingQueue<List<LiveInstance>> changeList =
new LinkedBlockingQueue<List<LiveInstance>>();
adminManager.addLiveInstanceChangeListener(new LiveInstanceChangeListener()
{
@Override
public void onLiveInstanceChange(List<LiveInstance> liveInstances,
NotificationContext changeContext)
{
// The queue is basically unbounded, so shouldn't throw exception when calling
// "add".
changeList.add(deepCopy(liveInstances));
}
});
// Check the initial condition
List<LiveInstance> instances = changeList.poll(1, TimeUnit.SECONDS);
Assert.assertNotNull(instances, "Expecting a list of live instance");
Assert.assertTrue(instances.isEmpty(), "Expecting an empty list of live instance");
// Join as participant, should trigger a live instance change event
HelixManager manager =
HelixManagerFactory.getZKHelixManager(clusterName,
"localhost_54321",
InstanceType.PARTICIPANT,
ZK_ADDR);
manager.connect();
instances = changeList.poll(1, TimeUnit.SECONDS);
Assert.assertNotNull(instances, "Expecting a list of live instance");
Assert.assertEquals(instances.size(), 1, "Expecting one live instance");
Assert.assertEquals(instances.get(0).getInstanceName(), manager.getInstanceName());
// Update data in the live instance node, should trigger another live instance change
// event
HelixDataAccessor helixDataAccessor = manager.getHelixDataAccessor();
PropertyKey propertyKey =
helixDataAccessor.keyBuilder().liveInstance(manager.getInstanceName());
LiveInstance instance = helixDataAccessor.getProperty(propertyKey);
Map<String, String> map = new TreeMap<String, String>();
map.put("k1", "v1");
instance.getRecord().setMapField("test", map);
Assert.assertTrue(helixDataAccessor.updateProperty(propertyKey, instance),
"Failed to update live instance node");
instances = changeList.poll(1, TimeUnit.SECONDS);
Assert.assertNotNull(instances, "Expecting a list of live instance");
Assert.assertEquals(instances.get(0).getRecord().getMapField("test"),
map,
"Wrong map data.");
manager.disconnect();
Thread.sleep(1000); // wait for callback finish
instances = changeList.poll(1, TimeUnit.SECONDS);
Assert.assertNotNull(instances, "Expecting a list of live instance");
Assert.assertTrue(instances.isEmpty(), "Expecting an empty list of live instance");
adminManager.disconnect();
}
@BeforeClass()
public void beforeClass() throws Exception
{
ZkClient zkClient = null;
try
{
zkClient = new ZkClient(ZK_ADDR);
zkClient.setZkSerializer(new ZNRecordSerializer());
if (zkClient.exists("/" + clusterName))
{
zkClient.deleteRecursive("/" + clusterName);
}
}
finally
{
if (zkClient != null)
{
zkClient.close();
}
}
ClusterSetup.processCommandLineArgs(getArgs("-zkSvr",
ZK_ADDR,
"-addCluster",
clusterName));
ClusterSetup.processCommandLineArgs(getArgs("-zkSvr",
ZK_ADDR,
"-addNode",
clusterName,
"localhost:54321"));
ClusterSetup.processCommandLineArgs(getArgs("-zkSvr",
ZK_ADDR,
"-addNode",
clusterName,
"localhost:54322"));
}
private String[] getArgs(String... args)
{
return args;
}
private List<LiveInstance> deepCopy(List<LiveInstance> instances)
{
List<LiveInstance> result = new ArrayList<LiveInstance>();
for (LiveInstance instance : instances)
{
result.add(new LiveInstance(instance.getRecord()));
}
return result;
}
}