2 * ============LICENSE_START==========================================
4 * ===================================================================
5 * Copyright (c) 2017 AT&T Intellectual Property
6 * ===================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
19 * ============LICENSE_END=============================================
20 * ====================================================================
22 package org.onap.music.lockingservice;
25 import java.io.IOException;
26 import java.util.StringTokenizer;
27 import java.util.concurrent.CountDownLatch;
28 import org.apache.zookeeper.KeeperException;
29 import org.apache.zookeeper.WatchedEvent;
30 import org.apache.zookeeper.Watcher;
31 import org.apache.zookeeper.Watcher.Event.KeeperState;
32 import org.onap.music.exceptions.MusicServiceException;
33 import org.onap.music.main.MusicCore;
34 import org.onap.music.main.MusicUtil;
35 import org.apache.zookeeper.ZooKeeper;
36 import com.att.eelf.configuration.EELFLogger;
37 import com.att.eelf.configuration.EELFManager;
38 import org.onap.music.datastore.MusicDataStore;
39 import org.onap.music.eelf.logging.EELFLoggerDelegate;
41 public class MusicLockingService implements Watcher {
43 private static final int SESSION_TIMEOUT = 180000;
44 ZkStatelessLockService zkLockHandle = null;
45 private CountDownLatch connectedSignal = new CountDownLatch(1);
46 private static EELFLogger logger =
47 EELFManager.getInstance().getLogger(MusicLockingService.class);
48 // private static EELFLoggerDelegate logger =
49 // EELFLoggerDelegate.getLogger(MusicLockingService.class);
51 public MusicLockingService() throws MusicServiceException {
53 ZooKeeper zk = new ZooKeeper(MusicUtil.getMyZkHost(), SESSION_TIMEOUT, this);
54 connectedSignal.await();
55 zkLockHandle = new ZkStatelessLockService(zk);
56 } catch (IOException e) {
57 logger.error(e.getMessage());
58 throw new MusicServiceException("IO Error has occured" + e.getMessage());
59 } catch (InterruptedException e) {
60 logger.error(e.getMessage());
61 throw new MusicServiceException("Exception Occured " + e.getMessage());
65 public ZkStatelessLockService getzkLockHandle() {
69 public MusicLockingService(String lockServer) {
71 ZooKeeper zk = new ZooKeeper(lockServer, SESSION_TIMEOUT, this);
72 connectedSignal.await();
73 zkLockHandle = new ZkStatelessLockService(zk);
74 } catch (IOException | InterruptedException e) {
75 logger.error(e.getMessage());
79 public void createLockaIfItDoesNotExist(String lockName) {
80 if (zkLockHandle.checkIfLockExists(lockName) == false) {
81 String lockHolder = null;
82 MusicLockState ml = new MusicLockState(MusicLockState.LockStatus.UNLOCKED, lockHolder);
83 byte[] data = ml.serialize();
84 zkLockHandle.createLock(lockName, data);
88 public void setLockState(String lockName, MusicLockState mls) {
89 byte[] data = mls.serialize();
90 zkLockHandle.setNodeData(lockName, data);
93 public MusicLockState getLockState(String lockName) {
95 byte[] data = zkLockHandle.getNodeData(lockName);
96 return MusicLockState.deSerialize(data);
99 public String createLockId(String lockName) {
100 String lockIdWithSlash = zkLockHandle.createLockId(lockName);
101 return lockIdWithSlash.replace('/', '$');
104 public boolean isMyTurn(String lockIdWithDollar) {
105 String lockId = lockIdWithDollar.replace('$', '/');
106 StringTokenizer st = new StringTokenizer(lockId);
107 String lockName = "/" + st.nextToken("/");
109 return zkLockHandle.lock(lockName, lockId);
110 } catch (KeeperException | InterruptedException e) {
111 logger.error(e.getMessage());
116 public void unlockAndDeleteId(String lockIdWithDollar) {
117 String lockId = lockIdWithDollar.replace('$', '/');
118 zkLockHandle.unlock(lockId);
121 public void deleteLock(String lockName) {
122 zkLockHandle.deleteLock(lockName);
125 public String whoseTurnIsIt(String lockName) {
126 String lockHolder = zkLockHandle.currentLockHolder(lockName);
127 return lockHolder.replace('/', '$');
131 public void process(WatchedEvent event) { // Watcher interface
132 if (event.getState() == KeeperState.SyncConnected) {
133 connectedSignal.countDown();
138 public void close() {
139 zkLockHandle.close();