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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. 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. See accompanying
 * LICENSE file.
 */
package com.gemstone.gemfire.internal.cache.versions;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

import com.gemstone.gemfire.internal.DataSerializableFixedID;

/**
 * The member that originated an update that is stored in the version
 * information of a region entry, or in the regions version vector.
 * 
 * A VersionMember could either be an InternalDistributedMember (for an in
 * memory region), or a UUID (for a persistent region).
 * 
 * VersionMembers should implement equals and hashcode.
 * 
 * @author dsmith
 *
 */
public interface VersionSource extends DataSerializableFixedID, Comparable {
  
  public void writeEssentialData(DataOutput out) throws IOException;
  
  public int getSizeInBytes();

}