package storm.kafka;
import backtype.storm.Config;
import backtype.storm.utils.Utils;
import com.netflix.curator.framework.CuratorFramework;
import com.netflix.curator.framework.CuratorFrameworkFactory;
import com.netflix.curator.retry.RetryNTimes;
import org.apache.zookeeper.CreateMode;
import org.json.simple.JSONValue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.nio.charset.Charset;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class ZkState {
public static final Logger LOG = LoggerFactory.getLogger(ZkState.class);
CuratorFramework _curator;
private CuratorFramework newCurator(Map stateConf) throws Exception {
Integer port = (Integer) stateConf.get(Config.TRANSACTIONAL_ZOOKEEPER_PORT);
String serverPorts = "";
for (String server : (List<String>) stateConf.get(Config.TRANSACTIONAL_ZOOKEEPER_SERVERS)) {
serverPorts = serverPorts + server + ":" + port + ",";
}
return CuratorFrameworkFactory.newClient(serverPorts,
Utils.getInt(stateConf.get(Config.STORM_ZOOKEEPER_SESSION_TIMEOUT)),
15000,
new RetryNTimes(Utils.getInt(stateConf.get(Config.STORM_ZOOKEEPER_RETRY_TIMES)),
Utils.getInt(stateConf.get(Config.STORM_ZOOKEEPER_RETRY_INTERVAL))));
}
public CuratorFramework getCurator() {
assert _curator != null;
return _curator;
}
public ZkState(Map stateConf) {
stateConf = new HashMap(stateConf);
try {
_curator = newCurator(stateConf);
_curator.start();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public void writeJSON(String path, Map<Object, Object> data) {
LOG.info("Writing " + path + " the data " + data.toString());
writeBytes(path, JSONValue.toJSONString(data).getBytes(Charset.forName("UTF-8")));
}
public void writeBytes(String path, byte[] bytes) {
try {
if (_curator.checkExists().forPath(path) == null) {
_curator.create()
.creatingParentsIfNeeded()
.withMode(CreateMode.PERSISTENT)
.forPath(path, bytes);
} else {
_curator.setData().forPath(path, bytes);
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public Map<Object, Object> readJSON(String path) {
try {
byte[] b = readBytes(path);
if (b == null) {
return null;
}
return (Map<Object, Object>) JSONValue.parse(new String(b, "UTF-8"));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public byte[] readBytes(String path) {
try {
if (_curator.checkExists().forPath(path) != null) {
return _curator.getData().forPath(path);
} else {
return null;
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public void close() {
_curator.close();
_curator = null;
}
}