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.chaos.policies;
019
020import java.util.ArrayList;
021import java.util.Arrays;
022import java.util.List;
023import org.apache.hadoop.hbase.chaos.actions.Action;
024import org.apache.hadoop.util.StringUtils;
025
026/** A policy which performs a sequence of actions deterministically. */
027public class DoActionsOncePolicy extends PeriodicPolicy {
028  private List<Action> actions;
029
030  public DoActionsOncePolicy(long periodMs, List<Action> actions) {
031    super(periodMs);
032    this.actions = new ArrayList<>(actions);
033  }
034
035  public DoActionsOncePolicy(long periodMs, Action... actions) {
036    this(periodMs, Arrays.asList(actions));
037  }
038
039  @Override
040  protected void runOneIteration() {
041    if (actions.isEmpty()) {
042      this.stop("done");
043      return;
044    }
045    Action action = actions.remove(0);
046
047    try {
048      action.perform();
049    } catch (Exception ex) {
050      LOG
051        .warn("Exception occurred during performing action: " + StringUtils.stringifyException(ex));
052    }
053  }
054
055  @Override
056  public void init(PolicyContext context) throws Exception {
057    super.init(context);
058    for (Action action : actions) {
059      action.init(this.context);
060    }
061  }
062}