package com.baidu.disconf.client.watch;
import org.apache.zookeeper.CreateMode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.baidu.disconf.client.config.inner.DisClientComConfig;
import com.baidu.disconf.client.config.inner.DisClientConfig;
import com.baidu.disconf.client.config.inner.DisClientSysConfig;
import com.baidu.disconf.client.fetcher.FetcherMgr;
import com.baidu.disconf.client.watch.inner.DisconfSysUpdateCallback;
import com.baidu.disconf.client.watch.inner.NodeWatcher;
import com.baidu.disconf.core.common.constants.DisConfigTypeEnum;
import com.baidu.disconf.core.common.path.DisconfWebPathMgr;
import com.baidu.disconf.core.common.path.ZooPathMgr;
import com.baidu.disconf.core.common.utils.ZooUtils;
import com.baidu.disconf.core.common.zookeeper.ZookeeperMgr;
/**
* Watch ZOO 模块, 依赖 FetcherMgr模块
*
* @author liaoqiqi
* @version 2014-6-10
*/
public class WatchMgr {
protected static final Logger LOGGER = LoggerFactory
.getLogger(WatchMgr.class);
/**
* 类级的内部类，也就是静态的成员式内部类，该内部类的实例与外部类的实例 没有绑定关系，而且只有被调用到时才会装载，从而实现了延迟加载。
*/
private static class SingletonHolder {
/**
* 静态初始化器，由JVM来保证线程安全
*/
private static WatchMgr instance = new WatchMgr();
}
public static WatchMgr getInstance() {
return SingletonHolder.instance;
}
private WatchMgr() {
}
/**
* 应用程序的 Zoo 根目录
*/
private String clientRootZooPath = "";
/**
* 应用程序的Zoo 配置文件 目录
*/
private String clientDisconfFileZooPath = "";
/**
* 应用程序的Zoo 配置项 目录
*/
private String clientDisconfItemZooPath = "";
/**
* Zoo hosts
*/
private String hosts = "";
private boolean isInit = false;
/**
*
* @Description: 获取自己的主备类型
*
* @return void
* @author liaoqiqi
* @date 2013-6-16
*/
public void init() throws Exception {
// 下载模块必须先初始化
if (!FetcherMgr.isInit()) {
throw new Exception("FetcherMgr should be init before WatchMgr");
}
// 获取 Zoo Hosts
try {
hosts = FetcherMgr
.getValueFromServer(DisconfWebPathMgr
.getZooHostsUrl(DisClientSysConfig.getInstance().CONF_SERVER_ZOO_ACTION));
} catch (Exception e) {
throw new Exception("cannot get zoo hosts", e);
}
// init zookeeper
ZookeeperMgr.getInstance().init(hosts,
DisClientSysConfig.getInstance().ZOOKEEPER_URL_PREFIX);
// 新建初始化目录
setupPath();
this.isInit = true;
}
/**
*
* @throws Exception
*/
private void setupPath() throws Exception {
// 应用根目录
this.clientRootZooPath = ZooPathMgr.getZooBaseUrl(
DisClientSysConfig.getInstance().ZOOKEEPER_URL_PREFIX,
DisClientConfig.getInstance().APP,
DisClientConfig.getInstance().ENV,
DisClientConfig.getInstance().VERSION);
ZookeeperMgr.getInstance().makeDir(clientRootZooPath, ZooUtils.getIp());
// 新建Zoo Store目录
this.clientDisconfFileZooPath = ZooPathMgr
.getFileZooPath(clientRootZooPath);
ZookeeperMgr.getInstance().makeDir(clientDisconfFileZooPath,
ZooUtils.getIp());
// 新建Zoo Store目录
this.clientDisconfItemZooPath = ZooPathMgr
.getItemZooPath(clientRootZooPath);
ZookeeperMgr.getInstance().makeDir(clientDisconfItemZooPath,
ZooUtils.getIp());
}
/**
* 创建路径
*
* @param path
*/
private void makePath(String path, String data) {
ZookeeperMgr.getInstance().makeDir(path, data);
}
/**
* 在指定路径下创建一个临时结点
*/
private void makeTempChildPath(String path, String data) {
String finterPrint = DisClientComConfig.getInstance()
.getInstanceFingerprint();
String mainTypeFullStr = path + "/" + finterPrint;
try {
ZookeeperMgr.getInstance().createEphemeralNode(mainTypeFullStr,
data, CreateMode.EPHEMERAL);
} catch (Exception e) {
LOGGER.error("cannot create: " + mainTypeFullStr + "\t"
+ e.toString());
}
}
/**
* 监控路径,监控前会事先创建路径,并且会新建一个自己的Temp子结点
*/
public void watchPath(String monitorPath, String keyName,
DisConfigTypeEnum disConfigTypeEnum, String value) {
// 先新建路径
makePath(monitorPath, "");
// 新建一个代表自己的临时结点
makeTempChildPath(monitorPath, value);
// 进行监控
NodeWatcher nodeWatcher = new NodeWatcher(monitorPath, keyName,
disConfigTypeEnum, new DisconfSysUpdateCallback());
nodeWatcher.monitorMaster();
}
/**
*
* @return
*/
public boolean isInit() {
return isInit;
}
//
//
//
public String getClientDisconfFileZooPath() {
return clientDisconfFileZooPath;
}
public void setClientDisconfFileZooPath(String clientDisconfFileZooPath) {
this.clientDisconfFileZooPath = clientDisconfFileZooPath;
}
public String getClientDisconfItemZooPath() {
return clientDisconfItemZooPath;
}
public void setClientDisconfItemZooPath(String clientDisconfItemZooPath) {
this.clientDisconfItemZooPath = clientDisconfItemZooPath;
}
}