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 */
018
019package org.apache.hadoop.hbase.chaos.actions;
020
021import java.io.IOException;
022
023import org.apache.hadoop.hbase.DistributedHBaseCluster;
024import org.apache.hadoop.hbase.HBaseCluster;
025import org.apache.hadoop.hbase.HBaseClusterManager;
026import org.slf4j.Logger;
027import org.slf4j.LoggerFactory;
028
029/**
030 * Base class for performing Actions based on linux commands requiring sudo privileges
031 */
032abstract public class SudoCommandAction extends Action {
033  private static final Logger LOG = LoggerFactory.getLogger(SudoCommandAction.class);
034
035  protected long timeout;
036  protected HBaseClusterManager clusterManager;
037
038  public SudoCommandAction(long timeout) {
039    this.timeout = timeout;
040  }
041
042  @Override
043  public void init(ActionContext context) throws IOException {
044    super.init(context);
045    HBaseCluster cluster = context.getHBaseCluster();
046    if(cluster != null && cluster instanceof DistributedHBaseCluster){
047      Object manager = ((DistributedHBaseCluster)cluster).getClusterManager();
048      if(manager != null && manager instanceof HBaseClusterManager){
049        clusterManager = (HBaseClusterManager) manager;
050      }
051    }
052  }
053
054  @Override
055  public void perform() throws Exception {
056    if(clusterManager == null){
057      LOG.info("Couldn't perform command action, it requires a distributed cluster.");
058      return;
059    }
060
061    // Don't try the modify if we're stopping
062    if (context.isStopping()) {
063      return;
064    }
065
066    localPerform();
067  }
068
069  abstract protected void localPerform() throws IOException;
070}