net.oschina.j2cache.hibernate4.strategy.ReadWriteJ2CacheNaturalIdRegionAccessStrategy Maven / Gradle / Ivy
/**
* Copyright (c) 2015-2017.
*
* 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.
*/
package net.oschina.j2cache.hibernate4.strategy;
import net.oschina.j2cache.hibernate4.regions.J2CacheNaturalIdRegion;
import org.hibernate.cache.CacheException;
import org.hibernate.cache.spi.NaturalIdRegion;
import org.hibernate.cache.spi.access.NaturalIdRegionAccessStrategy;
import org.hibernate.cache.spi.access.SoftLock;
import org.hibernate.cfg.Settings;
public class ReadWriteJ2CacheNaturalIdRegionAccessStrategy extends AbstractReadWriteJ2CacheAccessStrategy implements NaturalIdRegionAccessStrategy {
public ReadWriteJ2CacheNaturalIdRegionAccessStrategy(J2CacheNaturalIdRegion region, Settings settings) {
super(region, settings);
}
@Override
public NaturalIdRegion getRegion() {
return region();
}
@Override
public boolean insert(Object key, Object value) throws CacheException {
return false;
}
@Override
public boolean afterInsert(Object key, Object value) throws CacheException {
region().writeLock(key);
try {
final Lockable item = (Lockable) region().get(key);
if (item == null) {
region().put(key, new Item(value, null, region().nextTimestamp()));
return true;
} else {
return false;
}
} finally {
region().writeUnlock(key);
}
}
@Override
public boolean update(Object key, Object value) throws CacheException {
return false;
}
@Override
public boolean afterUpdate(Object key, Object value, SoftLock lock) throws CacheException {
region().writeLock(key);
try {
final Lockable item = (Lockable) region().get(key);
if (item != null && item.isUnlockable(lock)) {
final Lock lockItem = (Lock) item;
if (lockItem.wasLockedConcurrently()) {
decrementLock(key, lockItem);
return false;
} else {
region().put(key, new Item(value, null, region().nextTimestamp()));
return true;
}
} else {
handleLockExpiry(key, item);
return false;
}
} finally {
region().writeUnlock(key);
}
}
}