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.HConstants;
022import org.apache.hadoop.hbase.master.RegionPlan;
023import org.apache.yetus.audience.InterfaceAudience;
024
025import org.apache.hbase.thirdparty.com.google.common.collect.ImmutableList;
026
027@InterfaceAudience.Private
028class AssignRegionAction extends BalanceAction {
029  private final int region;
030  private final int server;
031
032  public AssignRegionAction(int region, int server) {
033    super(Type.ASSIGN_REGION);
034    this.region = region;
035    this.server = server;
036  }
037
038  public int getRegion() {
039    return region;
040  }
041
042  public int getServer() {
043    return server;
044  }
045
046  @Override
047  public BalanceAction undoAction() {
048    // TODO implement this. This action is not being used by the StochasticLB for now
049    // in case it uses it, we should implement this function.
050    throw new UnsupportedOperationException(HConstants.NOT_IMPLEMENTED);
051  }
052
053  @Override
054  List<RegionPlan> toRegionPlans(BalancerClusterState cluster) {
055    return ImmutableList
056      .of(new RegionPlan(cluster.regions[getRegion()], null, cluster.servers[getServer()]));
057  }
058
059  @Override
060  public String toString() {
061    return getType() + ": " + region + ":" + server;
062  }
063}