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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.master.balancer;

import org.apache.yetus.audience.InterfaceAudience;

@InterfaceAudience.Private
public class SwapRegionsAction extends BalanceAction {
  private final int fromServer;
  private final int fromRegion;
  private final int toServer;
  private final int toRegion;

  SwapRegionsAction(int fromServer, int fromRegion, int toServer, int toRegion) {
    super(Type.SWAP_REGIONS);
    this.fromServer = fromServer;
    this.fromRegion = fromRegion;
    this.toServer = toServer;
    this.toRegion = toRegion;
  }

  public int getFromServer() {
    return fromServer;
  }

  public int getFromRegion() {
    return fromRegion;
  }

  public int getToServer() {
    return toServer;
  }

  public int getToRegion() {
    return toRegion;
  }

  @Override
  public BalanceAction undoAction() {
    return new SwapRegionsAction(fromServer, toRegion, toServer, fromRegion);
  }

  @Override
  public String toString() {
    return getType() + ": " + fromRegion + ":" + fromServer + " <-> " + toRegion + ":" + toServer;
  }
}