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