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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.omid.transaction;

import org.apache.phoenix.thirdparty.com.google.common.base.Optional;

import java.io.IOException;

/**
 * An behavior that needs to be implemented by transaction managers 
 * to try to locate the possible commit timestamp for a cell. It
 * allows to the transaction managers implementing this interface to
 * search the commit timestamp in a local cache of their own or in 
 * their particular shadow cells implementation.
 */
public interface CommitTimestampLocator {

    Optional readCommitTimestampFromCache(long startTimestamp);

    Optional readCommitTimestampFromShadowCell(long startTimestamp) throws IOException;

}




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