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/* 
 * Copyright (c) 2008-2010, Hazel Ltd. 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.
 *
 */

package com.hazelcast.hibernate.access;

import java.util.logging.Level;

import org.hibernate.cache.CacheException;
import org.hibernate.cache.access.SoftLock;

import com.hazelcast.hibernate.region.HazelcastRegion;
import com.hazelcast.logging.ILogger;
import com.hazelcast.logging.Logger;


/**
 * @author Leo Kim ([email protected])
 */

public class ReadOnlyAccessDelegate extends NonStrictReadWriteAccessDelegate {

    private static final ILogger LOG = Logger.getLogger(ReadOnlyAccessDelegate.class.getName());

    public ReadOnlyAccessDelegate(final T hazelcastRegion) {
        super(hazelcastRegion);
    }

    /**
     * @throws UnsupportedOperationException
     */
    @Override
    public boolean afterUpdate(final Object key, final Object value, final Object currentVersion,
                               final Object previousVersion, final SoftLock lock) throws CacheException {
        throw new UnsupportedOperationException("Cannot update an item in a read-only cache: "
                + getHazelcastRegion().getName());
    }

    /**
     * @throws UnsupportedOperationException
     */
    @Override
    public SoftLock lockItem(final Object key, final Object version) throws CacheException {
        throw new UnsupportedOperationException("Attempting to lock an item in a read-only cache region: "
                + getHazelcastRegion().getName());
    }

    /**
     * @throws UnsupportedOperationException
     */
    @Override
    public SoftLock lockRegion() throws CacheException {
        throw new UnsupportedOperationException("Attempting to lock a read-only cache region: "
                + getHazelcastRegion().getName());
    }

    /**
     * This will issue a log warning stating that an attempt was made to unlock an item from a read-only cache region.
     */
    @Override
    public void unlockItem(final Object key, final SoftLock lock) throws CacheException {
        LOG.log(Level.WARNING, "Attempting to unlock an item from a read-only cache region");
    }

    /**
     * This will issue a log warning stating that an attempt was made to unlock a read-only cache region.
     */
    @Override
    public void unlockRegion(final SoftLock lock) throws CacheException {
        LOG.log(Level.WARNING, "Attempting to unlock a read-only cache region");
    }

    /**
     * @throws UnsupportedOperationException
     */
    @Override
    public boolean update(final Object key, final Object value, final Object currentVersion,
                          final Object previousVersion) throws CacheException {
        throw new UnsupportedOperationException("Attempting to update an item in a read-only cache: "
                + getHazelcastRegion().getName());
    }
}