本篇文章为大家展示了Curator该如何入门,内容简明扼要并且容易理解,绝对能使你眼前一亮,通过这篇文章的详细介绍希望你能有所收获。
Curator是Netflix公司开源的一个Zookeeper客户端,与Zookeeper提供的原生客户端相比,Curator的抽象层次更高,简化了Zookeeper客户端编程。
Maven依赖
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.9</version>
</dependency>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-recipes</artifactId>
<version>2.7.0</version>
</dependency>
1.创建Curator 连接实例(2种方式)
CuratorFramework client = CuratorFrameworkFactory.newClient(address, new ExponentialBackoffRetry(1000, 3));
CuratorFramework client = CuratorFrameworkFactory.builder()
.connectString(address)
.sessionTimeoutMs(1000)
.retryPolicy(retryPolicy)
.build();
CuratorFramework 使用之前必须先调用
client.start();
完成一系列操作后,调用client.close();方法,可以使用try-finally语句:
CuratorFramework client = CuratorFrameworkFactory.newClient(address, new ExponentialBackoffRetry(1000, 3));
try{
client.start();
...
}finally {
if(client!=null)
client.close();
}
2.创建节点
a. 创建永久性节点
client.create()
.creatingParentContainersIfNeeded()
.withMode(CreateMode.PERSISTENT)
.withACL(ZooDefs.Ids.OPEN_ACL_UNSAFE)
.forPath(path, "hello, zk".getBytes());
b. 创建临时节点
client.create().withMode(CreateMode.EPHEMERAL).forPath(path, "hello".getBytes());
3.获取节点值
byte[] buf = client.getData().forPath(path);System.out.println("get data path:"+path+", data:"+new String(buf));
4.设置节点值
client.setData().inBackground().forPath(path, "ricky".getBytes());
5.checkExists
Stat stat = client.checkExists().forPath(path);
if(stat==null){
System.out.println("exec create path:"+path);
}else {
System.out.println("exec getData");
}
6.删除节点
client.delete().deletingChildrenIfNeeded().forPath("/pandora");
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