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Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache.

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/**
 *  Copyright 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.Store;
import net.sf.ehcache.transaction.local.LocalTransactionContext;

import java.util.Set;

/**
 * A factory for {@link SoftLock}s
 *
 * @author Ludovic Orban
 */
public interface SoftLockManager {

    /**
     * Create a new soft lock ID and associated soft lock if necessary.
     *
     * @param transactionID the transaction ID under which the soft lock will operate
     * @param key the key of the Element this soft lock is protecting
     * @param newElement the new Element
     * @param oldElement the actual Element
     * @return the soft lock ID
     */
    SoftLockID createSoftLockID(TransactionID transactionID, Object key, Element newElement, Element oldElement);

    /**
     * Clear a soft lock
     * @param softLock the lock to clear
     */
    void clearSoftLock(SoftLock softLock);

    /**
     * Find a previously created and still existing soft lock
     * @param softLockId the soft lock's ID
     * @return the soft lock
     */
    SoftLock findSoftLockById(SoftLockID softLockId);

    /**
     * Get a Set of keys protected by soft locks which must not be visible to a transaction context
     * according to the isolation level.
     * @param transactionContext the transaction context
     * @return a Set of keys invisible to the context
     */
    Set