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Server functionality for HBase

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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.hadoop.hbase.regionserver;

import java.io.IOException;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.replication.regionserver.ReplicationLoad;
import org.apache.hadoop.hbase.wal.WALProvider;
import org.apache.yetus.audience.InterfaceAudience;

/**
 * Gateway to Cluster Replication. Used by
 * {@link org.apache.hadoop.hbase.regionserver.HRegionServer}. One such application is a
 * cross-datacenter replication service that can keep two hbase clusters in sync.
 */
@InterfaceAudience.Private
public interface ReplicationService {

  /**
   * Initializes the replication service object.
   * @param walProvider can be null if not initialized inside a live region server environment, for
   *          example, {@code ReplicationSyncUp}.
   */
  void initialize(Server rs, FileSystem fs, Path logdir, Path oldLogDir, WALProvider walProvider)
      throws IOException;

  /**
   * Start replication services.
   */
  void startReplicationService() throws IOException;

  /**
   * Stops replication service.
   */
  void stopReplicationService();

  /**
   * Refresh and Get ReplicationLoad
   */
  public ReplicationLoad refreshAndGetReplicationLoad();
}