net.oschina.j2cache.hibernate4.strategy.ReadOnlyJ2CacheNaturalIdRegionAccessStrategy Maven / Gradle / Ivy

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/**
 * 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 ReadOnlyJ2CacheNaturalIdRegionAccessStrategy extends AbstractJ2CacheAccessStrategy implements NaturalIdRegionAccessStrategy {

    public ReadOnlyJ2CacheNaturalIdRegionAccessStrategy(J2CacheNaturalIdRegion region, Settings settings) {
        super(region, settings);
    }

    @Override
    public NaturalIdRegion getRegion() {
        return region();
    }

    @Override
    public Object get(Object key, long txTimestamp) throws CacheException {
        return region().get(key);
    }

    @Override
    public boolean putFromLoad(Object key, Object value, long txTimestamp, Object version, boolean minimalPutOverride) throws CacheException {
        if (minimalPutOverride && region().contains(key)) {
            return false;
        } else {
            region().put(key, value);
            return true;
        }
    }

    @Override
    public SoftLock lockItem(Object key, Object version) throws UnsupportedOperationException {
        return null;
    }

    @Override
    public void unlockItem(Object key, SoftLock lock) throws CacheException {
        region().remove(key);
    }

    @Override
    public boolean insert(Object key, Object value) throws CacheException {
        return false;
    }

    @Override
    public boolean afterInsert(Object key, Object value) throws CacheException {
        region().put(key, value);
        return true;
    }

    @Override
    public boolean update(Object key, Object value) throws UnsupportedOperationException {
        throw new UnsupportedOperationException("Can't write to a readonly object");
    }

    @Override
    public boolean afterUpdate(Object key, Object value, SoftLock lock) throws UnsupportedOperationException {
        throw new UnsupportedOperationException("Can't write to a readonly object");
    }
}