2 * ============LICENSE_START========================================== org.onap.music
3 * =================================================================== Copyright (c) 2017 AT&T
4 * Intellectual Property ===================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
6 * in compliance with the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software distributed under the License
11 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
12 * or implied. See the License for the specific language governing permissions and limitations under
15 * ============LICENSE_END=============================================
16 * ====================================================================
18 package org.onap.music.lockingservice;
21 import java.io.IOException;
22 import java.io.PrintWriter;
23 import java.io.StringWriter;
24 import java.util.StringTokenizer;
25 import java.util.concurrent.CountDownLatch;
27 import org.apache.zookeeper.KeeperException;
28 import org.apache.zookeeper.WatchedEvent;
29 import org.apache.zookeeper.Watcher;
30 import org.apache.zookeeper.Watcher.Event.KeeperState;
31 import org.apache.zookeeper.ZooKeeper;
32 import org.onap.music.eelf.logging.EELFLoggerDelegate;
33 import org.onap.music.eelf.logging.format.AppMessages;
34 import org.onap.music.eelf.logging.format.ErrorSeverity;
35 import org.onap.music.eelf.logging.format.ErrorTypes;
36 import org.onap.music.exceptions.MusicLockingException;
37 import org.onap.music.exceptions.MusicServiceException;
38 import org.onap.music.main.MusicUtil;
41 public class MusicLockingService implements Watcher {
44 private static final int SESSION_TIMEOUT = 180000;
45 ZkStatelessLockService zkLockHandle = null;
46 private CountDownLatch connectedSignal = new CountDownLatch(1);
47 private static EELFLoggerDelegate logger =
48 EELFLoggerDelegate.getLogger(MusicLockingService.class);
50 public MusicLockingService() throws MusicServiceException {
52 ZooKeeper zk = new ZooKeeper(MusicUtil.getMyZkHost(), SESSION_TIMEOUT, this);
53 connectedSignal.await();
54 zkLockHandle = new ZkStatelessLockService(zk);
55 } catch (IOException e) {
56 logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.IOERROR, ErrorSeverity.ERROR, ErrorTypes.CONNECTIONERROR);
57 throw new MusicServiceException("IO Error has occured" + e.getMessage());
58 } catch (InterruptedException e) {
59 logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.EXECUTIONINTERRUPTED, ErrorSeverity.ERROR, ErrorTypes.LOCKINGERROR);
60 throw new MusicServiceException("Exception Occured " + e.getMessage());
64 public ZkStatelessLockService getzkLockHandle() {
68 public MusicLockingService(String lockServer) {
70 ZooKeeper zk = new ZooKeeper(lockServer, SESSION_TIMEOUT, this);
71 connectedSignal.await();
72 zkLockHandle = new ZkStatelessLockService(zk);
73 } catch (IOException e) {
74 logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.IOERROR, ErrorSeverity.ERROR, ErrorTypes.CONNECTIONERROR);
75 }catch( InterruptedException e) {
76 logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.EXECUTIONINTERRUPTED, ErrorSeverity.ERROR, ErrorTypes.LOCKINGERROR);
78 logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.UNKNOWNERROR, ErrorSeverity.ERROR, ErrorTypes.LOCKINGERROR);
82 public void createLockaIfItDoesNotExist(String lockName) {
83 if (!zkLockHandle.checkIfLockExists(lockName)) {
84 String lockHolder = null;
85 MusicLockState ml = new MusicLockState(MusicLockState.LockStatus.UNLOCKED, lockHolder);
86 byte[] data = ml.serialize();
87 zkLockHandle.createLock(lockName, data);
91 public void setLockState(String lockName, MusicLockState mls) {
92 byte[] data = mls.serialize();
93 zkLockHandle.setNodeData(lockName, data);
96 public MusicLockState getLockState(String lockName) throws MusicLockingException {
100 data = zkLockHandle.getNodeData(lockName);
101 }catch (Exception ex){
102 StringWriter sw = new StringWriter();
103 ex.printStackTrace();
104 ex.printStackTrace(new PrintWriter(sw));
105 String exceptionAsString = sw.toString();
106 logger.error(EELFLoggerDelegate.errorLogger,exceptionAsString);
107 throw new MusicLockingException(exceptionAsString);
110 return MusicLockState.deSerialize(data);
112 logger.error(EELFLoggerDelegate.errorLogger,"",AppMessages.INVALIDLOCK, ErrorSeverity.ERROR, ErrorTypes.LOCKINGERROR);
113 throw new MusicLockingException("Invalid lock or acquire failed");
117 public String createLockId(String lockName) {
118 String lockIdWithSlash = zkLockHandle.createLockId(lockName);
119 return lockIdWithSlash.replace('/', '$');
122 public boolean isMyTurn(String lockIdWithDollar) {
123 String lockId = lockIdWithDollar.replace('$', '/');
124 StringTokenizer st = new StringTokenizer(lockId);
125 String lockName = "/" + st.nextToken("/");
127 return zkLockHandle.lock(lockName, lockId);
128 } catch (KeeperException e) {
129 logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.LOCKINGERROR, ErrorSeverity.ERROR, ErrorTypes.LOCKINGERROR);
130 }catch( InterruptedException e) {
131 logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.EXECUTIONINTERRUPTED, ErrorSeverity.ERROR, ErrorTypes.LOCKINGERROR);
132 }catch(Exception e) {
133 logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.UNKNOWNERROR, ErrorSeverity.ERROR, ErrorTypes.LOCKINGERROR);
138 public void unlockAndDeleteId(String lockIdWithDollar) throws KeeperException.NoNodeException {
139 String lockId = lockIdWithDollar.replace('$', '/');
140 zkLockHandle.unlock(lockId);
143 public void deleteLock(String lockName) throws MusicLockingException {
144 if(lockIdExists(lockName))
145 zkLockHandle.deleteLock(lockName);
147 throw new MusicLockingException("Lock does not exist.Please check the lock: " + lockName + " and try again");
151 public String whoseTurnIsIt(String lockName) {
152 String lockHolder = zkLockHandle.currentLockHolder(lockName);
153 return lockHolder.replace('/', '$');
157 public void process(WatchedEvent event) { // Watcher interface
158 if (event.getState() == KeeperState.SyncConnected) {
159 connectedSignal.countDown();
164 public void close() {
165 zkLockHandle.close();
168 public boolean lockIdExists(String lockIdWithDollar) {
169 String lockId = lockIdWithDollar.replace('$', '/');
170 return zkLockHandle.checkIfLockExists(lockId);