监听zookeeper事件变化

常青树

虽然自己实现了客户端监听zk节点变化，今天发现有现成的工具，着实不赖，记录一下。呵呵！
如何使用Cruator监听zookeeper事件变化

package curator;
import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.CuratorFrameworkFactory.Builder;
import org.apache.curator.framework.recipes.cache.PathChildrenCache;
import org.apache.curator.framework.recipes.cache.PathChildrenCacheEvent;
import org.apache.curator.framework.recipes.cache.PathChildrenCacheListener;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.curator.utils.ZKPaths;
public class CuratorWatch {
static CuratorFramework zkclient = null;
static String nameSpace = "wasu";// 根节点
static {
String zkhost = "127.0.0.1:2181";// zk的host
RetryPolicy rp = new ExponentialBackoffRetry(1000, 3);// 重试机制
Builder builder = CuratorFrameworkFactory.builder().connectString(zkhost).connectionTimeoutMs(5000).sessionTimeoutMs(5000).retryPolicy(rp);
builder.namespace(nameSpace);
CuratorFramework zclient = builder.build();
zkclient = zclient;
zkclient.start();// 放在这前面执行
zkclient.newNamespaceAwareEnsurePath(nameSpace);
}
public static void main(String[] args) throws Exception {
watch();
Thread.sleep(Long.MAX_VALUE);
}
/**
*
* 监听节点变化
*
* */
public static void watch() throws Exception {
PathChildrenCache cache = new PathChildrenCache(zkclient, "/rmi", false);
cache.start();
System.out.println("监听开始/zk........");
PathChildrenCacheListener plis = new PathChildrenCacheListener() {
@Override
public void childEvent(CuratorFramework client, PathChildrenCacheEvent event) throws Exception {
switch (event.getType()) {
case CHILD_ADDED: {
System.out.println("Node added: " + ZKPaths.getNodeFromPath(event.getData().getPath()));
break;
}
case CHILD_UPDATED: {
System.out.println("Node changed: " + ZKPaths.getNodeFromPath(event.getData().getPath()));
break;
}
case CHILD_REMOVED: {
System.out.println("Node removed: " + ZKPaths.getNodeFromPath(event.getData().getPath()));
break;
}
}
}
};
// 注册监听
cache.getListenable().addListener(plis);
}
}

执行命令窗口截图：

事件监听效果截图：

如何使用Curator操作zookeeper
ZooKeeper系列之二:Zookeeper常用命令