package backtype.storm.transactional.state;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.curator.framework.CuratorFramework;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import backtype.storm.Config;
import backtype.storm.serialization.KryoValuesDeserializer;
import backtype.storm.serialization.KryoValuesSerializer;
import backtype.storm.utils.Utils;
public class TransactionalState {
CuratorFramework _curator;
KryoValuesSerializer _ser;
KryoValuesDeserializer _des;
public static TransactionalState newUserState(Map conf, String id,
Map componentConf) {
return new TransactionalState(conf, id, componentConf, "user");
}
public static TransactionalState newCoordinatorState(Map conf, String id,
Map componentConf) {
return new TransactionalState(conf, id, componentConf, "coordinator");
}
protected TransactionalState(Map conf, String id, Map componentConf,
String subroot) {
try {
conf = new HashMap(conf);
// ensure that the serialization registrations are consistent with
// the declarations in this spout
if (componentConf != null) {
conf.put(Config.TOPOLOGY_KRYO_REGISTER,
componentConf.get(Config.TOPOLOGY_KRYO_REGISTER));
}
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);
_ser = new KryoValuesSerializer(conf);
_des = new KryoValuesDeserializer(conf);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public void setData(String path, Object obj) {
path = "/" + path;
byte[] ser = _ser.serializeObject(obj);
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 _des.deserializeObject(_curator.getData().forPath(path));
} 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;
}
}