/**
* 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.camel.component.zookeepermaster.group;
import java.io.File;
import java.net.ServerSocket;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import org.apache.camel.component.zookeepermaster.group.internal.ChildData;
import org.apache.camel.component.zookeepermaster.group.internal.ZooKeeperGroup;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.retry.RetryNTimes;
import org.apache.zookeeper.server.NIOServerCnxnFactory;
import org.apache.zookeeper.server.ServerConfig;
import org.apache.zookeeper.server.ZooKeeperServer;
import org.apache.zookeeper.server.persistence.FileTxnSnapLog;
import org.junit.Test;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertTrue;
public class GroupTest {
private GroupListener listener = new GroupListener<NodeState>() {
@Override
public void groupEvent(Group<NodeState> group, GroupListener.GroupEvent event) {
boolean connected = group.isConnected();
boolean master = group.isMaster();
if (connected) {
Collection<NodeState> members = group.members().values();
System.err.println("GroupEvent: " + event + " (connected=" + connected + ", master=" + master + ", members=" + members + ")");
} else {
System.err.println("GroupEvent: " + event + " (connected=" + connected + ", master=false)");
}
}
};
private int findFreePort() throws Exception {
ServerSocket ss = new ServerSocket(0);
int port = ss.getLocalPort();
ss.close();
return port;
}
private NIOServerCnxnFactory startZooKeeper(int port) throws Exception {
ServerConfig cfg = new ServerConfig();
cfg.parse(new String[] {Integer.toString(port), "target/zk/data"});
ZooKeeperServer zkServer = new ZooKeeperServer();
FileTxnSnapLog ftxn = new FileTxnSnapLog(new File(cfg.getDataLogDir()), new File(cfg.getDataDir()));
zkServer.setTxnLogFactory(ftxn);
zkServer.setTickTime(cfg.getTickTime());
zkServer.setMinSessionTimeout(6000);
zkServer.setMaxSessionTimeout(9000);
NIOServerCnxnFactory cnxnFactory = new NIOServerCnxnFactory();
cnxnFactory.configure(cfg.getClientPortAddress(), cfg.getMaxClientCnxns());
cnxnFactory.startup(zkServer);
return cnxnFactory;
}
@Test
public void testOrder() throws Exception {
int port = findFreePort();
CuratorFramework curator = CuratorFrameworkFactory.builder()
.connectString("localhost:" + port)
.retryPolicy(new RetryNTimes(10, 100))
.build();
curator.start();
final String path = "/singletons/test/Order" + System.currentTimeMillis();
ArrayList<ZooKeeperGroup> members = new ArrayList<ZooKeeperGroup>();
for (int i = 0; i < 4; i++) {
ZooKeeperGroup<NodeState> group = new ZooKeeperGroup<NodeState>(curator, path, NodeState.class);
group.add(listener);
members.add(group);
}
for (ZooKeeperGroup group : members) {
assertFalse(group.isConnected());
assertFalse(group.isMaster());
}
NIOServerCnxnFactory cnxnFactory = startZooKeeper(port);
curator.getZookeeperClient().blockUntilConnectedOrTimedOut();
// first to start should be master if members are ordered...
int i = 0;
for (ZooKeeperGroup group : members) {
group.start();
group.update(new NodeState("foo" + i));
i++;
// wait for registration
while (group.getId() == null) {
TimeUnit.MILLISECONDS.sleep(100);
}
}
boolean firsStartedIsMaster = members.get(0).isMaster();
for (ZooKeeperGroup group : members) {
group.close();
}
curator.close();
cnxnFactory.shutdown();
cnxnFactory.join();
assertTrue("first started is master", firsStartedIsMaster);
}
@Test
public void testJoinAfterConnect() throws Exception {
int port = findFreePort();
CuratorFramework curator = CuratorFrameworkFactory.builder()
.connectString("localhost:" + port)
.retryPolicy(new RetryNTimes(10, 100))
.build();
curator.start();
final Group<NodeState> group = new ZooKeeperGroup<NodeState>(curator, "/singletons/test" + System.currentTimeMillis(), NodeState.class);
group.add(listener);
group.start();
assertFalse(group.isConnected());
assertFalse(group.isMaster());
GroupCondition groupCondition = new GroupCondition();
group.add(groupCondition);
NIOServerCnxnFactory cnxnFactory = startZooKeeper(port);
curator.getZookeeperClient().blockUntilConnectedOrTimedOut();
assertTrue(groupCondition.waitForConnected(5, TimeUnit.SECONDS));
assertFalse(group.isMaster());
group.update(new NodeState("foo"));
assertTrue(groupCondition.waitForMaster(5, TimeUnit.SECONDS));
group.close();
curator.close();
cnxnFactory.shutdown();
cnxnFactory.join();
}
@Test
public void testJoinBeforeConnect() throws Exception {
int port = findFreePort();
CuratorFramework curator = CuratorFrameworkFactory.builder()
.connectString("localhost:" + port)
.retryPolicy(new RetryNTimes(10, 100))
.build();
curator.start();
Group<NodeState> group = new ZooKeeperGroup<NodeState>(curator, "/singletons/test" + System.currentTimeMillis(), NodeState.class);
group.add(listener);
group.start();
GroupCondition groupCondition = new GroupCondition();
group.add(groupCondition);
assertFalse(group.isConnected());
assertFalse(group.isMaster());
group.update(new NodeState("foo"));
NIOServerCnxnFactory cnxnFactory = startZooKeeper(port);
curator.getZookeeperClient().blockUntilConnectedOrTimedOut();
assertTrue(groupCondition.waitForConnected(5, TimeUnit.SECONDS));
assertTrue(groupCondition.waitForMaster(5, TimeUnit.SECONDS));
group.close();
curator.close();
cnxnFactory.shutdown();
cnxnFactory.join();
}
@Test
public void testRejoinAfterDisconnect() throws Exception {
int port = findFreePort();
CuratorFramework curator = CuratorFrameworkFactory.builder()
.connectString("localhost:" + port)
.retryPolicy(new RetryNTimes(10, 100))
.build();
curator.start();
NIOServerCnxnFactory cnxnFactory = startZooKeeper(port);
Group<NodeState> group = new ZooKeeperGroup<NodeState>(curator, "/singletons/test" + System.currentTimeMillis(), NodeState.class);
group.add(listener);
group.update(new NodeState("foo"));
group.start();
GroupCondition groupCondition = new GroupCondition();
group.add(groupCondition);
curator.getZookeeperClient().blockUntilConnectedOrTimedOut();
assertTrue(groupCondition.waitForConnected(5, TimeUnit.SECONDS));
assertTrue(groupCondition.waitForMaster(5, TimeUnit.SECONDS));
cnxnFactory.shutdown();
cnxnFactory.join();
groupCondition.waitForDisconnected(5, TimeUnit.SECONDS);
group.remove(groupCondition);
assertFalse(group.isConnected());
assertFalse(group.isMaster());
groupCondition = new GroupCondition();
group.add(groupCondition);
cnxnFactory = startZooKeeper(port);
curator.getZookeeperClient().blockUntilConnectedOrTimedOut();
curator.getZookeeperClient().blockUntilConnectedOrTimedOut();
assertTrue(groupCondition.waitForConnected(5, TimeUnit.SECONDS));
assertTrue(groupCondition.waitForMaster(5, TimeUnit.SECONDS));
group.close();
curator.close();
cnxnFactory.shutdown();
cnxnFactory.join();
}
//Tests that if close() is executed right after start(), there are no left over entries.
//(see https://github.com/jboss-fuse/fuse/issues/133)
@Test
public void testGroupClose() throws Exception {
int port = findFreePort();
NIOServerCnxnFactory cnxnFactory = startZooKeeper(port);
CuratorFrameworkFactory.Builder builder = CuratorFrameworkFactory.builder()
.connectString("localhost:" + port)
.connectionTimeoutMs(6000)
.sessionTimeoutMs(6000)
.retryPolicy(new RetryNTimes(10, 100));
CuratorFramework curator = builder.build();
curator.start();
curator.getZookeeperClient().blockUntilConnectedOrTimedOut();
String groupNode = "/singletons/test" + System.currentTimeMillis();
curator.create().creatingParentsIfNeeded().forPath(groupNode);
for (int i = 0; i < 100; i++) {
ZooKeeperGroup<NodeState> group = new ZooKeeperGroup<NodeState>(curator, groupNode, NodeState.class);
group.add(listener);
group.update(new NodeState("foo"));
group.start();
group.close();
List<String> entries = curator.getChildren().forPath(groupNode);
assertTrue(entries.isEmpty() || group.isUnstable());
if (group.isUnstable()) {
// let's wait for session timeout
curator.close();
curator = builder.build();
curator.start();
curator.getZookeeperClient().blockUntilConnectedOrTimedOut();
}
}
curator.close();
cnxnFactory.shutdown();
cnxnFactory.join();
}
@Test
public void testAddFieldIgnoredOnParse() throws Exception {
int port = findFreePort();
NIOServerCnxnFactory cnxnFactory = startZooKeeper(port);
CuratorFramework curator = CuratorFrameworkFactory.builder()
.connectString("localhost:" + port)
.retryPolicy(new RetryNTimes(10, 100))
.build();
curator.start();
curator.getZookeeperClient().blockUntilConnectedOrTimedOut();
String groupNode = "/singletons/test" + System.currentTimeMillis();
curator.create().creatingParentsIfNeeded().forPath(groupNode);
curator.getZookeeperClient().blockUntilConnectedOrTimedOut();
final ZooKeeperGroup<NodeState> group = new ZooKeeperGroup<NodeState>(curator, groupNode, NodeState.class);
group.add(listener);
group.start();
GroupCondition groupCondition = new GroupCondition();
group.add(groupCondition);
group.update(new NodeState("foo"));
assertTrue(groupCondition.waitForConnected(5, TimeUnit.SECONDS));
assertTrue(groupCondition.waitForMaster(5, TimeUnit.SECONDS));
ChildData currentData = group.getCurrentData().get(0);
final int version = currentData.getStat().getVersion();
NodeState lastState = group.getLastState();
String json = lastState.toString();
System.err.println("JSON:" + json);
String newValWithNewField = json.substring(0, json.lastIndexOf('}')) + ",\"Rubbish\":\"Rubbish\"}";
curator.getZookeeperClient().getZooKeeper().setData(group.getId(), newValWithNewField.getBytes(), version);
assertTrue(group.isMaster());
int attempts = 0;
while (attempts++ < 5 && version == group.getCurrentData().get(0).getStat().getVersion()) {
TimeUnit.SECONDS.sleep(1);
}
assertNotEquals("We see the updated version", version, group.getCurrentData().get(0).getStat().getVersion());
System.err.println("CurrentData:" + group.getCurrentData());
group.close();
curator.close();
cnxnFactory.shutdown();
cnxnFactory.join();
}
private class GroupCondition implements GroupListener<NodeState> {
private CountDownLatch connected = new CountDownLatch(1);
private CountDownLatch master = new CountDownLatch(1);
private CountDownLatch disconnected = new CountDownLatch(1);
@Override
public void groupEvent(Group<NodeState> group, GroupEvent event) {
switch (event) {
case CONNECTED:
case CHANGED:
connected.countDown();
if (group.isMaster()) {
master.countDown();
}
break;
case DISCONNECTED:
disconnected.countDown();
break;
default:
// noop
}
}
public boolean waitForConnected(long time, TimeUnit timeUnit) throws InterruptedException {
return connected.await(time, timeUnit);
}
public boolean waitForDisconnected(long time, TimeUnit timeUnit) throws InterruptedException {
return disconnected.await(time, timeUnit);
}
public boolean waitForMaster(long time, TimeUnit timeUnit) throws InterruptedException {
return master.await(time, timeUnit);
}
}
}