| /** |
| * 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 org.apache.s4.comm.topology; |
| |
| import java.util.concurrent.Callable; |
| |
| import org.I0Itec.zkclient.IZkConnection; |
| import org.I0Itec.zkclient.ZkConnection; |
| import org.I0Itec.zkclient.exception.ZkNoNodeException; |
| import org.I0Itec.zkclient.serialize.ZkSerializer; |
| import org.apache.zookeeper.data.Stat; |
| /** |
| * |
| * Overwriting the ZKclient since the org.I0Itec.zkclient.ZkClient does not expose some important methods |
| */ |
| public class ZkClient extends org.I0Itec.zkclient.ZkClient { |
| |
| public ZkClient(IZkConnection connection, int connectionTimeout, |
| ZkSerializer zkSerializer) { |
| super(connection, connectionTimeout, zkSerializer); |
| } |
| |
| public ZkClient(IZkConnection connection, int connectionTimeout) { |
| super(connection, connectionTimeout); |
| } |
| |
| public ZkClient(IZkConnection connection) { |
| super(connection); |
| } |
| |
| public ZkClient(String zkServers, int sessionTimeout, int connectionTimeout) { |
| super(zkServers, sessionTimeout, connectionTimeout); |
| } |
| |
| public ZkClient(String zkServers, int connectionTimeout) { |
| super(zkServers, connectionTimeout); |
| } |
| |
| public ZkClient(String serverstring) { |
| super(serverstring); |
| } |
| |
| public IZkConnection getConnection() { |
| return _connection; |
| } |
| |
| public long getSessionId(){ |
| return ((ZkConnection)_connection).getZookeeper().getSessionId(); |
| } |
| |
| public Stat getStat(final String path) { |
| Stat stat = retryUntilConnected(new Callable<Stat>() { |
| |
| @Override |
| public Stat call() throws Exception { |
| Stat stat = ((ZkConnection) _connection).getZookeeper().exists( |
| path, false); |
| return stat; |
| } |
| }); |
| |
| return stat; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public <T extends Object> T readData(String path, |
| boolean returnNullIfPathNotExists) { |
| T data = null; |
| try { |
| data = (T) readData(path, null); |
| } catch (ZkNoNodeException e) { |
| if (!returnNullIfPathNotExists) { |
| throw e; |
| } |
| } |
| return data; |
| } |
| |
| } |