/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package storm.trident.topology.state;
import backtype.storm.Config;
import backtype.storm.utils.Utils;
import org.apache.curator.framework.CuratorFramework;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.json.simple.JSONValue;
public class TransactionalState {
CuratorFramework _curator;
public static TransactionalState newUserState(Map conf, String id) {
return new TransactionalState(conf, id, "user");
}
public static TransactionalState newCoordinatorState(Map conf, String id) {
return new TransactionalState(conf, id, "coordinator");
}
protected TransactionalState(Map conf, String id, String subroot) {
try {
conf = new HashMap(conf);
String rootDir = conf.get(Config.TRANSACTIONAL_ZOOKEEPER_ROOT) + "/" + id + "/" + subroot;
List<String> servers = (List<String>) getWithBackup(conf, Config.TRANSACTIONAL_ZOOKEEPER_SERVERS, Config.STORM_ZOOKEEPER_SERVERS);
Object port = getWithBackup(conf, Config.TRANSACTIONAL_ZOOKEEPER_PORT, Config.STORM_ZOOKEEPER_PORT);
CuratorFramework initter = Utils.newCuratorStarted(conf, servers, port);
try {
initter.create().creatingParentsIfNeeded().forPath(rootDir);
} catch(KeeperException.NodeExistsException e) {
}
initter.close();
_curator = Utils.newCuratorStarted(conf, servers, port, rootDir);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public void setData(String path, Object obj) {
path = "/" + path;
byte[] ser;
try {
ser = JSONValue.toJSONString(obj).getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
try {
if(_curator.checkExists().forPath(path)!=null) {
_curator.setData().forPath(path, ser);
} else {
_curator.create()
.creatingParentsIfNeeded()
.withMode(CreateMode.PERSISTENT)
.forPath(path, ser);
}
} catch(Exception e) {
throw new RuntimeException(e);
}
}
public void delete(String path) {
path = "/" + path;
try {
_curator.delete().forPath(path);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public List<String> list(String path) {
path = "/" + path;
try {
if(_curator.checkExists().forPath(path)==null) {
return new ArrayList<String>();
} else {
return _curator.getChildren().forPath(path);
}
} catch(Exception e) {
throw new RuntimeException(e);
}
}
public void mkdir(String path) {
setData(path, 7);
}
public Object getData(String path) {
path = "/" + path;
try {
if(_curator.checkExists().forPath(path)!=null) {
return JSONValue.parse(new String(_curator.getData().forPath(path), "UTF-8"));
} else {
return null;
}
} catch(Exception e) {
throw new RuntimeException(e);
}
}
public void close() {
_curator.close();
}
private Object getWithBackup(Map amap, Object primary, Object backup) {
Object ret = amap.get(primary);
if(ret==null) return amap.get(backup);
return ret;
}
}