zookeeper分布式配置管理

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配置中心代码：

package test2;

import java.io.IOException;
import java.io.PrintStream;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooDefs;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.data.Stat;

public class ConfigCenter implements Watcher {
ZooKeeper zk = null;
String znode;

ConfigCenter(String address, String znode) {
  this.znode = znode;
  try {
   this.zk = new ZooKeeper(address, 3000, this);
   Stat st = this.zk.exists("/root1", true);
   if (st == null) {
         this.zk.create(znode, new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE,
                CreateMode.PERSISTENT);
   }
  } catch (IOException e) {
   e.printStackTrace();
   this.zk = null;
  } catch (KeeperException e) {
   e.printStackTrace();
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
}

public void process(WatchedEvent event) {
  System.out.println(event.toString());
  try {
   this.zk.exists("/root1", true);
  } catch (KeeperException e) {
   e.printStackTrace();
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
}

void updateConfig(String str) {
  try {
   Stat s = this.zk.exists(this.znode, true);
   this.zk.setData(this.znode, str.getBytes(), s.getVersion());
  } catch (Exception e) {
   e.printStackTrace();
  }
}
}

监听客户端代码：

package test2;

import java.io.IOException;
import java.io.PrintStream;
import java.util.concurrent.CountDownLatch;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.data.Stat;
import org.apache.zookeeper.ZooKeeper;

//public class ConfigCenter implements Watcher

public class ZooKeeperWatcher implements Watcher ,Runnable {

private ZooKeeper zooKeeper = null;
private String znode;

public ZooKeeper getZooKeeper() {
return this.zooKeeper;
}

//zw1.connect("127.0.0.1", "/root1");

public void connect(String hosts, String znode) throws IOException,
   InterruptedException, KeeperException {
  this.zooKeeper = new ZooKeeper(hosts, 2000, this);
  this.znode = znode;
  this.zooKeeper.exists(znode, true);
}

public void setData(byte[] data) {
  try {
   Stat s = this.zooKeeper.exists(znode, false);
   this.zooKeeper.setData(znode, data, s.getVersion());
  } catch (Exception e) {
   e.printStackTrace();
  }
}

public void process(WatchedEvent event) {
  System.out.println(event.toString());
  try {
   this.zooKeeper.exists(znode, true);//不知道为什么一定要加上这句话，下次事件到来时，才会触发process事件
  } catch (KeeperException e) {
   e.printStackTrace();
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
}

public void run() {
  try {
   synchronized (this) {
                           while (true) {
                              wait();
                            }
                        }
  } catch (InterruptedException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
}

}

测试代码：

package test2;

import java.io.IOException;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.ZooKeeper;

public class test {
public static void main(String[] args) throws IOException, InterruptedException, KeeperException {
  ZooKeeperWatcher zw1 = new ZooKeeperWatcher();
  zw1.connect("127.0.0.1", "/root1");
  ZooKeeperWatcher zw2 = new ZooKeeperWatcher();
  zw2.connect("127.0.0.1", "/root1");
  new Thread(zw1).start();
  new Thread(zw2).start();
  ConfigCenter cc = new ConfigCenter("127.0.0.1","/root1");
  cc.updateConfig("a");
  cc.updateConfig("b");
  cc.updateConfig("c");
  cc.updateConfig("d");
}
}

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