geode-core/src/main/java/org/apache/geode/internal/cache/versions/VersionSource.java

/*
 * 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.geode.internal.cache.versions;

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

import org.apache.geode.internal.serialization.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.
 */
public interface VersionSource<T> extends DataSerializableFixedID, Comparable<T> {

  void writeEssentialData(DataOutput out) throws IOException;

  default boolean isDiskStoreId() {
    return false;
  }
}