001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.master.balancer;
019
020import java.util.List;
021import org.apache.hadoop.hbase.master.RegionPlan;
022import org.apache.yetus.audience.InterfaceAudience;
023
024import org.apache.hbase.thirdparty.com.google.common.collect.ImmutableList;
025
026@InterfaceAudience.Private
027class MoveRegionAction extends BalanceAction {
028  private final int region;
029  private final int fromServer;
030  private final int toServer;
031
032  public MoveRegionAction(int region, int fromServer, int toServer) {
033    super(Type.MOVE_REGION);
034    this.fromServer = fromServer;
035    this.region = region;
036    this.toServer = toServer;
037  }
038
039  public int getRegion() {
040    return region;
041  }
042
043  public int getFromServer() {
044    return fromServer;
045  }
046
047  public int getToServer() {
048    return toServer;
049  }
050
051  @Override
052  public BalanceAction undoAction() {
053    return new MoveRegionAction(region, toServer, fromServer);
054  }
055
056  @Override
057  List<RegionPlan> toRegionPlans(BalancerClusterState cluster) {
058    return ImmutableList.of(new RegionPlan(cluster.regions[getRegion()],
059      cluster.servers[getFromServer()], cluster.servers[getToServer()]));
060  }
061
062  @Override
063  public String toString() {
064    return getType() + ": " + region + ":" + fromServer + " -> " + toServer;
065  }
066}