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/*-
* ============LICENSE_START=======================================================
* ONAP : APPC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Copyright (C) 2017 Amdocs
* =============================================================================
* 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.
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
* ============LICENSE_END=========================================================
*/
package org.openecomp.appc.lockmanager.impl.inmemory;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.openecomp.appc.lockmanager.api.LockException;
import org.openecomp.appc.lockmanager.api.LockManager;
import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
public class LockManagerInMemoryImpl implements LockManager {
private static LockManagerInMemoryImpl instance = null;
private Map<String, LockValue> lockedVNFs;
private static final EELFLogger debugLogger = EELFManager.getInstance().getDebugLogger();
private LockManagerInMemoryImpl() {
lockedVNFs = new ConcurrentHashMap<>();
}
public static LockManager getLockManager() {
if(instance == null) {
instance = new LockManagerInMemoryImpl();
}
return instance;
}
@Override
public boolean acquireLock(String resource, String owner) throws LockException {
return acquireLock(resource, owner, 0);
}
@Override
public boolean acquireLock(String resource, String owner, long timeout) throws LockException {
debugLogger.debug("Try to acquire lock on resource " + resource + " with owner " + owner);
long now = System.currentTimeMillis();
LockValue lockValue = lockedVNFs.get(resource);
if (lockValue != null) {
if (lockIsMine(lockValue, owner, now) || hasExpired(lockValue, now)) {
setExpirationTime(resource, owner, timeout, now);
debugLogger.debug("Locked successfully resource " + resource + " with owner " + owner + " for " + timeout + " ms");
return hasExpired(lockValue, now);
}
else {
debugLogger.debug("Owner " + owner + " tried to lock resource " + resource + " but it is already locked by owner " + lockValue.getOwner());
throw new LockException("Owner " + owner + " tried to lock resource " + resource + " but it is already locked by owner " + lockValue.getOwner());
}
}
else {
setExpirationTime(resource, owner, timeout, now);
debugLogger.debug("Locked successfully resource " + resource + " with owner " + owner + " for " + timeout + " ms");
return true;
}
}
@Override
public void releaseLock(String resource, String owner) throws LockException {
debugLogger.debug("Try to release lock on resource " + resource + " with owner " + owner);
long now = System.currentTimeMillis();
LockValue lockValue = lockedVNFs.get(resource);
if (lockValue != null) {
if (!hasExpired(lockValue, now)) {
if (isOwner(lockValue, owner)) {
debugLogger.debug("Unlocked successfully resource " + resource + " with owner " + owner);
lockedVNFs.remove(resource);
}
else {
debugLogger.debug("Unlock failed. Tried to release lock on resource " + resource + " from owner " + owner + " but it is held by a different owner");
throw new LockException("Unlock failed. Tried to release lock on resource " + resource + " from owner " + owner + " but it is held by a different owner");
}
}
else {
lockedVNFs.remove(resource);
debugLogger.debug("Unlock failed. lock on resource " + resource + " has expired");
throw new LockException("Unlock failed. lock on resource " + resource + " has expired");
}
}
else {
debugLogger.debug("Tried to release lock on resource " + resource + " from owner " + owner + " but there is not lock on this resource");
throw new LockException("Tried to release lock on resource " + resource + " from owner " + owner + " but there is not lock on this resource");
}
}
@Override
public boolean isLocked(String resource) {
return lockedVNFs.get(resource)!=null?true:false;
}
private boolean lockIsMine(LockValue lockValue, String owner, long now) {
return isOwner(lockValue, owner) && !hasExpired(lockValue, now);
}
private boolean isOwner(LockValue lockValue, String owner) {
return lockValue.getOwner() != null && lockValue.getOwner().equals(owner);
}
private boolean hasExpired(LockValue lockValue, long now) {
return (lockValue.getExpirationTime() != 0 && now > lockValue.getExpirationTime());
}
private void setExpirationTime(String resource, String owner, long timeout, long now) {
long expirationTime = timeout == 0 ? 0 : now + timeout;
LockValue lockValue = new LockValue(owner, expirationTime);
lockedVNFs.put(resource, lockValue);
}
}
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