package cgl.iotcloud.transport.kafka.consumer; import org.apache.curator.framework.CuratorFramework; import org.apache.curator.framework.CuratorFrameworkFactory; import org.apache.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.Map; public class ZkState { public static final Logger LOG = LoggerFactory.getLogger(ZkState.class); CuratorFramework _curator; private CuratorFramework newCurator(String zkServers) throws Exception { return CuratorFrameworkFactory.newClient(zkServers, 30000, 15000, new RetryNTimes(3, 500)); } public CuratorFramework getCurator() { assert _curator != null; return _curator; } public ZkState(String zkServers, String zkPath) { try { _curator = newCurator(zkServers); _curator.start(); } catch (Exception e) { throw new RuntimeException(e); } } public void writeJSON(String path, Map<Object, Object> data) { LOG.debug("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; } }