net.sf.ehcache.transaction.ReadCommittedSoftLockFactoryImpl Maven / Gradle / Ivy

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This is the ehcache core module. Pair it with other modules for added functionality.

There is a newer version: 2.6.11

/**
 *  Copyright 2003-2010 Terracotta, Inc.
 *
 *  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.sf.ehcache.transaction;

import net.sf.ehcache.Element;
import net.sf.ehcache.store.chm.ConcurrentHashMap;
import net.sf.ehcache.transaction.local.LocalTransactionContext;

import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ConcurrentMap;

/**
 * A SoftLockFactory implementation which creates soft locks with Read-Committed isolation level
 *
 * @author Ludovic Orban
 */
public class ReadCommittedSoftLockFactoryImpl implements SoftLockFactory {

    private final static Object MARKER = new Object();

    private final String cacheName;

    // actually all we need would be a ConcurrentSet...
    private final ConcurrentMap newKeyLocks = new ConcurrentHashMap();

    private final ConcurrentMap allLocks = new ConcurrentHashMap();

    /**
     * Create a new ReadCommittedSoftLockFactoryImpl instance for a cache
     * @param cacheName the name of the cache
     */
    public ReadCommittedSoftLockFactoryImpl(String cacheName) {
        this.cacheName = cacheName;
    }

    /**
     * {@inheritDoc}
     */
    public SoftLock createSoftLock(TransactionID transactionID, Object key, Element newElement, Element oldElement) {
        ReadCommittedSoftLockImpl softLock = new ReadCommittedSoftLockImpl(this, transactionID, key, newElement, oldElement);

        allLocks.put(softLock, MARKER);

        if (oldElement == null) {
            newKeyLocks.put(softLock, MARKER);
        }
        return softLock;
    }

    /**
     * {@inheritDoc}
     */
    public Set