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/*
* 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.zookeeper.test;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Timeout;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class DisconnectedWatcherTest extends ClientBase {
protected static final Logger LOG = LoggerFactory.getLogger(DisconnectedWatcherTest.class);
final int TIMEOUT = 5000;
private class MyWatcher extends CountdownWatcher {
LinkedBlockingQueue<WatchedEvent> events = new LinkedBlockingQueue<>();
public void process(WatchedEvent event) {
super.process(event);
if (event.getType() != Event.EventType.None) {
try {
events.put(event);
} catch (InterruptedException e) {
LOG.warn("ignoring interrupt during event.put");
}
}
}
}
private CountdownWatcher watcher1;
private ZooKeeper zk1;
private MyWatcher watcher2;
private ZooKeeper zk2;
@BeforeEach
public void setUp() throws Exception {
super.setUp();
watcher1 = new CountdownWatcher();
zk1 = createClient(watcher1);
watcher2 = new MyWatcher();
}
@AfterEach
public void tearDown() throws Exception {
if (zk2 != null) {
zk2.close();
}
if (zk1 != null) {
zk1.close();
}
super.tearDown();
}
// @see jira issue ZOOKEEPER-961
@Test
public void testChildWatcherAutoResetWithChroot() throws Exception {
zk1.create("/ch1", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
zk2 = createClient(watcher2, hostPort + "/ch1");
zk2.getChildren("/", true);
// this call shouldn't trigger any error or watch
zk1.create("/youdontmatter1", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
// this should trigger the watch
zk1.create("/ch1/youshouldmatter1", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
WatchedEvent e = watcher2.events.poll(TIMEOUT, TimeUnit.MILLISECONDS);
assertNotNull(e);
assertEquals(EventType.NodeChildrenChanged, e.getType());
assertEquals("/", e.getPath());
MyWatcher childWatcher = new MyWatcher();
zk2.getChildren("/", childWatcher);
stopServer();
watcher2.waitForDisconnected(3000);
startServer();
watcher2.waitForConnected(3000);
watcher1.waitForConnected(3000);
// this should trigger the watch
zk1.create("/ch1/youshouldmatter2", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
e = childWatcher.events.poll(TIMEOUT, TimeUnit.MILLISECONDS);
assertNotNull(e);
assertEquals(EventType.NodeChildrenChanged, e.getType());
assertEquals("/", e.getPath());
}
@Test
public void testDefaultWatcherAutoResetWithChroot() throws Exception {
zk1.create("/ch1", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
zk2 = createClient(watcher2, hostPort + "/ch1");
zk2.getChildren("/", true);
// this call shouldn't trigger any error or watch
zk1.create("/youdontmatter1", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
// this should trigger the watch
zk1.create("/ch1/youshouldmatter1", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
WatchedEvent e = watcher2.events.poll(TIMEOUT, TimeUnit.MILLISECONDS);
assertNotNull(e);
assertEquals(EventType.NodeChildrenChanged, e.getType());
assertEquals("/", e.getPath());
zk2.getChildren("/", true);
stopServer();
watcher2.waitForDisconnected(3000);
startServer();
watcher2.waitForConnected(3000);
watcher1.waitForConnected(3000);
// this should trigger the watch
zk1.create("/ch1/youshouldmatter2", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
e = watcher2.events.poll(TIMEOUT, TimeUnit.MILLISECONDS);
assertNotNull(e);
assertEquals(EventType.NodeChildrenChanged, e.getType());
assertEquals("/", e.getPath());
}
@Test
public void testDeepChildWatcherAutoResetWithChroot() throws Exception {
zk1.create("/ch1", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
zk1.create("/ch1/here", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
zk1.create("/ch1/here/we", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
zk1.create("/ch1/here/we/are", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
zk2 = createClient(watcher2, hostPort + "/ch1/here/we");
zk2.getChildren("/are", true);
// this should trigger the watch
zk1.create("/ch1/here/we/are/now", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
WatchedEvent e = watcher2.events.poll(TIMEOUT, TimeUnit.MILLISECONDS);
assertNotNull(e);
assertEquals(EventType.NodeChildrenChanged, e.getType());
assertEquals("/are", e.getPath());
MyWatcher childWatcher = new MyWatcher();
zk2.getChildren("/are", childWatcher);
stopServer();
watcher2.waitForDisconnected(3000);
startServer();
watcher2.waitForConnected(3000);
watcher1.waitForConnected(3000);
// this should trigger the watch
zk1.create("/ch1/here/we/are/again", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
e = childWatcher.events.poll(TIMEOUT, TimeUnit.MILLISECONDS);
assertNotNull(e);
assertEquals(EventType.NodeChildrenChanged, e.getType());
assertEquals("/are", e.getPath());
}
// @see jira issue ZOOKEEPER-706. Test auto reset of a large number of
// watches which require multiple SetWatches calls.
@Test
@Timeout(value = 14, unit = TimeUnit.MINUTES)
public void testManyChildWatchersAutoReset() throws Exception {
zk2 = createClient(watcher2);
// 110 character base path
String pathBase = "/long-path-000000000-111111111-222222222-333333333-444444444-"
+ "555555555-666666666-777777777-888888888-999999999";
zk1.create(pathBase, null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
// Create 10,000 nodes. This should ensure the length of our
// watches set below exceeds 1MB.
List<String> paths = new ArrayList<>();
for (int i = 0; i < 10000; i++) {
String path = zk1.create(pathBase + "/ch-", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT_SEQUENTIAL);
paths.add(path);
}
LOG.info("Created 10,000 nodes.");
MyWatcher childWatcher = new MyWatcher();
// Set a combination of child/exists/data watches
int i = 0;
for (String path : paths) {
if (i % 3 == 0) {
zk2.getChildren(path, childWatcher);
} else if (i % 3 == 1) {
zk2.exists(path + "/foo", childWatcher);
} else if (i % 3 == 2) {
zk2.getData(path, childWatcher, null);
}
i++;
}
stopServer();
watcher2.waitForDisconnected(30000);
startServer();
watcher2.waitForConnected(30000);
watcher1.waitForConnected(30000);
// Trigger the watches and ensure they properly propagate to the client
i = 0;
for (String path : paths) {
if (i % 3 == 0) {
zk1.create(path + "/ch", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
WatchedEvent e = childWatcher.events.poll(TIMEOUT, TimeUnit.MILLISECONDS);
assertNotNull(e);
assertEquals(EventType.NodeChildrenChanged, e.getType());
assertEquals(path, e.getPath());
} else if (i % 3 == 1) {
zk1.create(path + "/foo", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
WatchedEvent e = childWatcher.events.poll(TIMEOUT, TimeUnit.MILLISECONDS);
assertNotNull(e);
assertEquals(EventType.NodeCreated, e.getType());
assertEquals(path + "/foo", e.getPath());
} else if (i % 3 == 2) {
zk1.setData(path, new byte[] { 1, 2, 3 }, -1);
WatchedEvent e = childWatcher.events.poll(TIMEOUT, TimeUnit.MILLISECONDS);
assertNotNull(e);
assertEquals(EventType.NodeDataChanged, e.getType());
assertEquals(path, e.getPath());
}
i++;
}
}
}
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