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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.tuscany.sca.endpoint.zookeeper;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.KeeperException.Code;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.data.ACL;
import org.apache.zookeeper.data.Stat;
import org.apache.zookeeper.server.ZooKeeperServer;
import org.apache.zookeeper.server.ZooKeeperServerMain;
import org.apache.zookeeper.server.ZooKeeperServer.DataTreeBuilder;
import org.apache.zookeeper.server.persistence.FileTxnSnapLog;
/**
*
*/
public class ZooKeeperHelper implements Watcher {
public ZooKeeper connect(String host, int port, int timeout) throws IOException {
return new ZooKeeper(host + ":" + port, timeout, this);
}
public String getName(String uri) {
String name = uri.replace("$", "$$");
return name.replace('/', '$');
}
private byte[] getBytes(String str) {
try {
return str.getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
throw new IllegalArgumentException(e);
}
}
public String join(ZooKeeper zooKeeper, String domainURI, String nodeURI) throws KeeperException,
InterruptedException {
String domain = "/" + getName(domainURI);
Stat stat = zooKeeper.exists(domain, false);
String path = domain;
if (stat == null) {
path = zooKeeper.create(domain, getBytes(domainURI), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}
path = path + "/" + getName(nodeURI);
stat = zooKeeper.exists(path, false);
if (stat != null) {
return zooKeeper.create(path, getBytes(nodeURI), Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
} else {
return path;
}
}
public String getPath(String... uris) {
StringBuffer buffer = new StringBuffer();
for (String uri : uris) {
buffer.append('/').append(getName(uri));
}
return buffer.toString();
}
public void put(ZooKeeper zooKeeper, String domainURI, String nodeURI, String endpointURI, byte[] endpoint)
throws KeeperException, InterruptedException {
String path = join(zooKeeper, domainURI, nodeURI);
path = path + "/" + getName(endpointURI);
Stat stat = zooKeeper.exists(path, false);
if (stat == null) {
zooKeeper.create(path, endpoint, Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
} else {
zooKeeper.setData(path, endpoint, -1);
}
}
public void remove(ZooKeeper zooKeeper, String domainURI, String nodeURI, String endpointURI)
throws KeeperException, InterruptedException {
String path = getPath(domainURI, nodeURI, endpointURI);
zooKeeper.delete(path, -1);
}
public void remove(ZooKeeper zooKeeper, String domainURI, String nodeURI) throws InterruptedException,
KeeperException {
String node = getPath(domainURI, nodeURI);
zooKeeper.delete(node, -1);
}
public byte[] get(ZooKeeper zooKeeper, String domainURI, String nodeURI, String endpointURI)
throws KeeperException, InterruptedException {
String path = getPath(domainURI, nodeURI, endpointURI);
return zooKeeper.getData(path, false, new Stat());
}
public List<byte[]> get(ZooKeeper zooKeeper, String domainURI, String nodeURI) throws KeeperException,
InterruptedException {
String node = getPath(domainURI, nodeURI);
List<String> endpoints = zooKeeper.getChildren(node, false);
List<byte[]> data = new ArrayList<byte[]>();
for (String endpoint : endpoints) {
Stat stat = new Stat();
data.add(zooKeeper.getData(endpoint, false, stat));
}
return data;
}
public List<byte[]> get(ZooKeeper zooKeeper, String domainURI) throws KeeperException, InterruptedException {
String path = getPath(domainURI);
List<String> nodes = zooKeeper.getChildren(path, false);
List<byte[]> data = new ArrayList<byte[]>();
for (String node : nodes) {
List<String> endpoints = zooKeeper.getChildren(node, false);
for (String endpoint : endpoints) {
Stat stat = new Stat();
data.add(zooKeeper.getData(endpoint, false, stat));
}
}
return data;
}
public ZooKeeper create(String connectString, int timeout, long sessionId, byte[] password) throws IOException {
return new ZooKeeper(connectString, timeout, this, sessionId, password);
}
public void process(WatchedEvent event) {
System.out.println(event);
}
public ZooKeeperServer createServer(File dataDir, File snapDir, int tickTime) throws IOException {
FileTxnSnapLog log = new FileTxnSnapLog(dataDir, snapDir);
DataTreeBuilder builder = new ZooKeeperServer.BasicDataTreeBuilder();
return new ZooKeeperServer(log, tickTime, builder);
}
public void put(ZooKeeper zooKeeper, String key, Object value) throws KeeperException, InterruptedException {
byte[] data = serialize(value);
List<ACL> acls = Collections.emptyList();
zooKeeper.create(key, data, acls, CreateMode.PERSISTENT);
}
public byte[] serialize(Object value) {
return null;
}
public static void main(final String[] args) throws Exception {
final String options[] =
args.length != 0 ? args
: new String[] {"9999", System.getProperty("java.io.tmpdir") + File.separator + "zookeeper"};
Thread thread = new Thread() {
public void run() {
ZooKeeperServerMain.main(options);
}
};
thread.start();
Thread.sleep(1000);
ZooKeeper zooKeeper = new ZooKeeperHelper().connect("localhost", 9999, 500);
System.out.println(zooKeeper.getSessionId());
try {
String data = new String(zooKeeper.getData("/x", false, null));
System.out.println(data);
} catch (KeeperException e) {
if (e.code() == Code.NONODE) {
zooKeeper.create("/x", "X".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}
}
zooKeeper.create("/x/y", "XY".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
Thread.sleep(1000);
String data = new String(zooKeeper.getData("/x/y", true, null));
System.out.println(data);
zooKeeper.close();
Thread.sleep(500);
System.exit(0);
}
}
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