zookeeper session过期 Curator
zookeeper 中 session 过期解释：当client 和 server 连接后，不是100%保证一直可以连上的。比如网络问题。那么client需要重连，这种机制自己实现比较复杂，还在有Curator客户端帮我们解决了，只需要在连接后注册一个监听器就可以了。
模拟服务端线路不通可以开启防火墙方法，或者，
开启81端口：
iptables -I INPUT -i eth0 -p tcp --dport 81 -j ACCEPT
iptables -I OUTPUT -o eth0 -p tcp --sport 81 -j ACCEPT
关闭81端口：
iptables -I INPUT -i eth0 -p tcp --dport 81 -j DROP
iptables -I OUTPUT -o eth0 -p tcp --sport 81 -j DROP
然后保存
具体代码如下：
代码如下：
String path = "/session/service-";
SessionConnectionStateListener listener = new SessionConnectionStateListener(path,zookeeperConnectionString);
client.getConnectionStateListenable().addListener(listener);
client.create().creatingParentsIfNeeded().withMode(CreateMode.EPHEMERAL_SEQUENTIAL)
.forPath(path,"haha".getBytes());
下面是监听器：
package com.mmblue.demo;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.state.ConnectionState;
import org.apache.curator.framework.state.ConnectionStateListener;
import org.apache.zookeeper.CreateMode;
public class SessionConnectionStateListener implements ConnectionStateListener {
private String zkRegPathPrefix;
private String regContent;
public SessionConnectionStateListener(String zkRegPathPrefix, String regContent) {
this.zkRegPathPrefix = zkRegPathPrefix;
this.regContent = regContent;
}
@Override
public void stateChanged(CuratorFramework curatorFramework, ConnectionState connectionState){
if(connectionState == ConnectionState.LOST){
while(true){
try {
System.err.println("我来了，嘿嘿");
if(curatorFramework.getZookeeperClient().blockUntilConnectedOrTimedOut()){
curatorFramework.create().creatingParentsIfNeeded().withMode(CreateMode.EPHEMERAL_SEQUENTIAL).forPath(zkRegPathPrefix, regContent.getBytes("UTF-8"));
break;
}
} catch (InterruptedException e) {
break;
} catch (Exception e){
}
}
}
}
}
参考文章：
http://www.codelast.com/?p=6049
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