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.policies;
020
021import org.apache.hadoop.hbase.IntegrationTestingUtility;
022import org.apache.hadoop.hbase.chaos.actions.Action;
023import org.apache.hadoop.hbase.util.StoppableImplementation;
024import org.slf4j.Logger;
025import org.slf4j.LoggerFactory;
026
027/**
028 * A policy to introduce chaos to the cluster
029 */
030public abstract class Policy extends StoppableImplementation implements Runnable {
031
032  protected static final Logger LOG = LoggerFactory.getLogger(Policy.class);
033
034  protected PolicyContext context;
035
036  public void init(PolicyContext context) throws Exception {
037    this.context = context;
038
039    // Used to wire up stopping.
040    context.setPolicy(this);
041  }
042
043  /**
044   * A context for a Policy
045   */
046  public static class PolicyContext extends Action.ActionContext {
047
048    Policy policy = null;
049
050    public PolicyContext(IntegrationTestingUtility util) {
051      super(util);
052    }
053
054    @Override
055    public boolean isStopping() {
056      return policy.isStopped();
057    }
058
059    public void setPolicy(Policy policy) {
060      this.policy = policy;
061    }
062  }
063}