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/*-
* ============LICENSE_START=======================================================
* openECOMP : SDN-C
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights
* reserved.
* ================================================================================
* 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.openecomp.sdnc.lock.comp;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import org.openecomp.sdnc.lock.dao.ResourceLockDao;
import org.openecomp.sdnc.lock.data.ResourceLock;
public class LockHelperImpl implements LockHelper {
private ResourceLockDao resourceLockDao;
private int retryCount = 10;
private int lockWait = 5; // Seconds
@Override
public void lock(String resourceName, String lockRequester, int lockTimeout /* Seconds */) {
lock(Collections.singleton(resourceName), lockRequester, lockTimeout);
}
@Override
public void unlock(String resourceName, boolean force) {
unlock(Collections.singleton(resourceName), force);
}
@Override
public void lock(Collection<String> resourceNameList, String lockRequester, int lockTimeout /* Seconds */) {
for (int i = 0; true; i++) {
try {
tryLock(resourceNameList, lockRequester, lockTimeout);
return;
} catch (ResourceLockedException e) {
if (i > retryCount)
throw e;
try {
Thread.sleep(lockWait * 1000);
} catch (InterruptedException ex) {
}
}
}
}
@Override
public void unlock(Collection<String> lockNames, boolean force) {
if (lockNames == null || lockNames.size() == 0)
return;
resourceLockDao.lockTable();
try {
for (String name : lockNames) {
ResourceLock l = resourceLockDao.getByResourceName(name);
if (l != null)
if (force || l.lockCount == 1)
resourceLockDao.delete(l.id);
else
resourceLockDao.decrementLockCount(l.id);
}
} finally {
resourceLockDao.unlockTable();
}
}
public void tryLock(Collection<String> resourceNameList, String lockRequester, int lockTimeout /* Seconds */) {
if (resourceNameList == null || resourceNameList.size() == 0)
return;
lockRequester = generateLockRequester(lockRequester, 100);
resourceLockDao.lockTable();
try {
// First check if all requested records are available to lock
Date now = new Date();
List<ResourceLock> dbLockList = new ArrayList<ResourceLock>();
List<String> insertLockNameList = new ArrayList<String>();
for (String name : resourceNameList) {
ResourceLock l = resourceLockDao.getByResourceName(name);
boolean canLock =
l == null || now.getTime() > l.expirationTime.getTime() || lockRequester != null &&
lockRequester.equals(l.lockHolder) || l.lockCount <= 0;
if (!canLock)
throw new ResourceLockedException(l.resourceName, l.lockHolder, lockRequester);
if (l != null)
dbLockList.add(l);
else
insertLockNameList.add(name);
}
// Update the lock info in DB
for (ResourceLock l : dbLockList)
resourceLockDao.update(l.id, now, new Date(now.getTime() + lockTimeout * 1000), l.lockCount + 1);
// Insert records for those that are not yet there
for (String lockName : insertLockNameList) {
ResourceLock l = new ResourceLock();
l.resourceName = lockName;
l.lockHolder = lockRequester;
l.lockTime = now;
l.expirationTime = new Date(now.getTime() + lockTimeout * 1000);
l.lockCount = 1;
resourceLockDao.add(l);
}
} finally {
resourceLockDao.unlockTable();
}
}
private static String generateLockRequester(String name, int maxLength) {
if (name == null)
name = "";
int l1 = name.length();
String tname = Thread.currentThread().getName();
int l2 = tname.length();
if (l1 + l2 + 1 > maxLength) {
int maxl1 = maxLength / 2;
if (l1 > maxl1) {
name = name.substring(0, maxl1);
l1 = maxl1;
}
int maxl2 = maxLength - l1 - 1;
if (l2 > maxl2)
tname = tname.substring(0, 6) + "..." + tname.substring(l2 - maxl2 + 9);
}
return tname + '-' + name;
}
public void setResourceLockDao(ResourceLockDao resourceLockDao) {
this.resourceLockDao = resourceLockDao;
}
public void setRetryCount(int retryCount) {
this.retryCount = retryCount;
}
public void setLockWait(int lockWait /* Seconds */) {
this.lockWait = lockWait;
}
}
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