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/*
* ============LICENSE_START========================================== org.onap.music
* =================================================================== Copyright (c) 2017 AT&T
* Intellectual Property ===================================================================
* Licensed 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.
*
* ============LICENSE_END=============================================
* ====================================================================
*/
package org.onap.music.lockingservice;
import java.io.IOException;
import java.util.StringTokenizer;
import java.util.concurrent.CountDownLatch;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooKeeper;
import org.onap.music.eelf.logging.EELFLoggerDelegate;
import org.onap.music.eelf.logging.format.AppMessages;
import org.onap.music.eelf.logging.format.ErrorSeverity;
import org.onap.music.eelf.logging.format.ErrorTypes;
import org.onap.music.exceptions.MusicLockingException;
import org.onap.music.exceptions.MusicServiceException;
import org.onap.music.main.CachingUtil;
import org.onap.music.main.MusicUtil;
public class MusicLockingService implements Watcher {
private static final int SESSION_TIMEOUT = 180000;
ZkStatelessLockService zkLockHandle = null;
private CountDownLatch connectedSignal = new CountDownLatch(1);
private static EELFLoggerDelegate logger =
EELFLoggerDelegate.getLogger(MusicLockingService.class);
public MusicLockingService() throws MusicServiceException {
try {
ZooKeeper zk = new ZooKeeper(MusicUtil.getMyZkHost(), SESSION_TIMEOUT, this);
connectedSignal.await();
zkLockHandle = new ZkStatelessLockService(zk);
} catch (IOException e) {
logger.error("Error", e);
logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.IOERROR, ErrorSeverity.ERROR, ErrorTypes.CONNECTIONERROR);
throw new MusicServiceException("IO Error has occured" + e.getMessage());
} catch (InterruptedException e) {
logger.error("Error", e);
logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.EXECUTIONINTERRUPTED, ErrorSeverity.ERROR, ErrorTypes.LOCKINGERROR);
throw new MusicServiceException("Exception Occured " + e.getMessage());
}
}
public MusicLockingService(String lockServer) {
try {
ZooKeeper zk = new ZooKeeper(lockServer, SESSION_TIMEOUT, this);
connectedSignal.await();
zkLockHandle = new ZkStatelessLockService(zk);
} catch (IOException e) {
logger.error("Error", e);
logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.IOERROR, ErrorSeverity.ERROR, ErrorTypes.CONNECTIONERROR);
}catch( InterruptedException e) {
logger.error("Error", e);
logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.EXECUTIONINTERRUPTED, ErrorSeverity.ERROR, ErrorTypes.LOCKINGERROR);
}catch(Exception e) {
logger.error("Error", e);
logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.UNKNOWNERROR, ErrorSeverity.ERROR, ErrorTypes.LOCKINGERROR);
}
}
public ZkStatelessLockService getzkLockHandle() {
return zkLockHandle;
}
public void createLockaIfItDoesNotExist(String lockName) {
if (!zkLockHandle.checkIfLockExists(lockName)) {
String lockHolder = null;
MusicLockState ml = new MusicLockState(MusicLockState.LockStatus.UNLOCKED, lockHolder);
byte[] data = ml.serialize();
zkLockHandle.createLock(lockName, data);
}
}
public void setLockState(String lockName, MusicLockState mls) {
byte[] data = mls.serialize();
zkLockHandle.setNodeData(lockName, data);
}
public MusicLockState getLockState(String lockName) throws MusicLockingException {
byte[] data = null;
try{
data = zkLockHandle.getNodeData(lockName);
}catch (Exception ex){
logger.error(EELFLoggerDelegate.errorLogger, ex,AppMessages.UNKNOWNERROR, ErrorSeverity.ERROR, ErrorTypes.LOCKINGERROR);
}
if(data !=null)
return MusicLockState.deSerialize(data);
else {
logger.error(EELFLoggerDelegate.errorLogger,"",AppMessages.INVALIDLOCK, ErrorSeverity.ERROR, ErrorTypes.LOCKINGERROR);
throw new MusicLockingException("Invalid lock or acquire failed");
}
}
public String createLockId(String lockName) {
String lockIdWithSlash = zkLockHandle.createLockId(lockName);
return lockIdWithSlash.replace('/', '$');
}
public boolean isMyTurn(String lockIdWithDollar) {
String lockId = lockIdWithDollar.replace('$', '/');
StringTokenizer st = new StringTokenizer(lockId);
String lockName = "/" + st.nextToken("/");
try {
return zkLockHandle.lock(lockName, lockId);
} catch (KeeperException e) {
logger.error("Error", e);
logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.LOCKINGERROR, ErrorSeverity.ERROR, ErrorTypes.LOCKINGERROR);
}catch( InterruptedException e) {
logger.error("Error", e);
logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.EXECUTIONINTERRUPTED, ErrorSeverity.ERROR, ErrorTypes.LOCKINGERROR);
}catch(Exception e) {
logger.error("Error", e);
logger.error(EELFLoggerDelegate.errorLogger, e.getMessage(),AppMessages.UNKNOWNERROR, ErrorSeverity.ERROR, ErrorTypes.LOCKINGERROR);
}
return false;
}
public void unlockAndDeleteId(String lockIdWithDollar) throws KeeperException.NoNodeException {
String lockId = lockIdWithDollar.replace('$', '/');
zkLockHandle.unlock(lockId);
CachingUtil.deleteKeysFromDB("'"+lockId+"'");
}
public void deleteLock(String lockName) throws MusicLockingException {
if(lockIdExists(lockName))
zkLockHandle.deleteLock(lockName);
else{
throw new MusicLockingException("Lock does not exist.Please check the lock: " + lockName + " and try again");
}
}
public String whoseTurnIsIt(String lockName) {
String lockHolder = zkLockHandle.currentLockHolder(lockName);
return lockHolder.replace('/', '$');
}
public void process(WatchedEvent event) { // Watcher interface
if (event.getState() == KeeperState.SyncConnected) {
connectedSignal.countDown();
}
}
public void close() {
zkLockHandle.close();
}
public boolean lockIdExists(String lockIdWithDollar) {
String lockId = lockIdWithDollar.replace('$', '/');
return zkLockHandle.checkIfLockExists(lockId);
}
}
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