package com.alibaba.jstorm.cluster;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.curator.framework.CuratorFramework;
import org.apache.log4j.Logger;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import backtype.storm.Config;
import com.alibaba.jstorm.callback.ClusterStateCallback;
import com.alibaba.jstorm.callback.WatcherCallBack;
import com.alibaba.jstorm.utils.PathUtils;
import com.alibaba.jstorm.zk.Zookeeper;
/**
* All ZK interface implementation
*
* @author yannian.mu
*
*/
public class DistributedClusterState implements ClusterState {
private static Logger LOG = Logger.getLogger(DistributedClusterState.class);
private Zookeeper zkobj = new Zookeeper();
private CuratorFramework zk;
private WatcherCallBack watcher;
/**
* why run all callbacks, when receive one event
*/
private ConcurrentHashMap<UUID, ClusterStateCallback> callbacks = new ConcurrentHashMap<UUID, ClusterStateCallback>();
private Map<Object, Object> conf;
private AtomicBoolean active;
public DistributedClusterState(Map<Object, Object> _conf) throws Exception {
conf = _conf;
// just mkdir STORM_ZOOKEEPER_ROOT dir
CuratorFramework _zk = mkZk();
String path = String.valueOf(conf.get(Config.STORM_ZOOKEEPER_ROOT));
zkobj.mkdirs(_zk, path);
_zk.close();
active = new AtomicBoolean(true);
watcher = new WatcherCallBack() {
@Override
public void execute(KeeperState state, EventType type, String path) {
if (active.get()) {
if (!(state.equals(KeeperState.SyncConnected))) {
LOG.warn("Received event " + state + ":" + type + ":"
+ path + " with disconnected Zookeeper.");
} else {
LOG.info("Received event " + state + ":" + type + ":"
+ path);
}
if (!type.equals(EventType.None)) {
for (Entry<UUID, ClusterStateCallback> e : callbacks
.entrySet()) {
ClusterStateCallback fn = e.getValue();
fn.execute(type, path);
}
}
}
}
};
zk = null;
zk = mkZk(watcher);
}
@SuppressWarnings("unchecked")
private CuratorFramework mkZk() throws IOException {
return zkobj.mkClient(conf,
(List<String>) conf.get(Config.STORM_ZOOKEEPER_SERVERS),
conf.get(Config.STORM_ZOOKEEPER_PORT), "");
}
@SuppressWarnings("unchecked")
private CuratorFramework mkZk(WatcherCallBack watcher)
throws NumberFormatException, IOException {
return zkobj.mkClient(conf,
(List<String>) conf.get(Config.STORM_ZOOKEEPER_SERVERS),
conf.get(Config.STORM_ZOOKEEPER_PORT),
String.valueOf(conf.get(Config.STORM_ZOOKEEPER_ROOT)), watcher);
}
@Override
public void close() {
this.active.set(false);
zk.close();
}
@Override
public void delete_node(String path) throws Exception {
zkobj.deletereRcursive(zk, path);
}
@Override
public List<String> get_children(String path, boolean watch)
throws Exception {
return zkobj.getChildren(zk, path, watch);
}
@Override
public byte[] get_data(String path, boolean watch) throws Exception {
return zkobj.getData(zk, path, watch);
}
@Override
public void mkdirs(String path) throws Exception {
zkobj.mkdirs(zk, path);
}
@Override
public void set_data(String path, byte[] data) throws Exception {
if (zkobj.exists(zk, path, false)) {
zkobj.setData(zk, path, data);
} else {
zkobj.mkdirs(zk, PathUtils.parent_path(path));
zkobj.createNode(zk, path, data, CreateMode.PERSISTENT);
}
}
@Override
public void set_ephemeral_node(String path, byte[] data) throws Exception {
zkobj.mkdirs(zk, PathUtils.parent_path(path));
if (zkobj.exists(zk, path, false)) {
zkobj.setData(zk, path, data);
} else {
zkobj.createNode(zk, path, data, CreateMode.EPHEMERAL);
}
}
@Override
public UUID register(ClusterStateCallback callback) {
UUID id = UUID.randomUUID();
this.callbacks.put(id, callback);
return id;
}
@Override
public ClusterStateCallback unregister(UUID id) {
return this.callbacks.remove(id);
}
@Override
public boolean node_existed(String path, boolean watch) throws Exception {
// TODO Auto-generated method stub
return zkobj.existsNode(zk, path, watch);
}
@Override
public void tryToBeLeader(String path, byte[] host) throws Exception {
// TODO Auto-generated method stub
zkobj.createNode(zk, path, host, CreateMode.EPHEMERAL);
}
}