zookeeper持有者类

import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.imps.CuratorFrameworkState;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.Closeable;
import java.io.IOException;

/**
 * zookeeper连接持有者
 *
 * @author
 * @version V1.0
 * @modify by user: $author$ $date$
 * @modify by reason:{方法名}:{原因}
 */
public class ZookeeperHolder implements Closeable {
    // /日志
    private static final Logger LOG = LoggerFactory.getLogger(ZookeeperHolder.class);
    // zk超时时间
    private static final int SESSION_TIME = 30 * 1000;
    //出错尝试次数
    private static final int RETRY_TIMES = 3;
    private CuratorFramework client;
    private String zkUrl = null;

    public ZookeeperHolder(String zkUrl) {
        this.zkUrl = zkUrl;
        client = initClient(zkUrl);
    }

    public CuratorFramework getClient() {
        if (client == null) {
            client = initClient(zkUrl);
        }else if (!client.getState().equals(CuratorFrameworkState.STARTED)) {
            client.start();
        }
        return client;
    }

    /**
     * 初始化客户端
     *
     * @param zkUrl
     * @return
     */
    private CuratorFramework initClient(String zkUrl) {
        LOG.info("初始化Zookeeper连接...");
        try {
            RetryPolicy retryPolicy = new ExponentialBackoffRetry(SESSION_TIME, RETRY_TIMES);
            CuratorFramework client = CuratorFrameworkFactory.newClient(zkUrl, retryPolicy);
            client.start();
            return client;
        } catch (Throwable e) {
            LOG.error("Init zk client error with url [{}]", zkUrl, e);
            throw e;
        }
    }

    @Override
    protected void finalize() throws Throwable {
        if (client != null) {
            client.close();
        }
        super.finalize();
    }

    @Override
    public void close() throws IOException {
        if (client != null) {
            client.close();
        }
    }
}