/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase.chaos.policies;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.hadoop.hbase.chaos.actions.Action;
import org.apache.hadoop.util.StringUtils;
/** A policy which performs a sequence of actions deterministically. */
public class DoActionsOncePolicy extends PeriodicPolicy {
private List<Action> actions;
public DoActionsOncePolicy(long periodMs, List<Action> actions) {
super(periodMs);
this.actions = new ArrayList<Action>(actions);
}
public DoActionsOncePolicy(long periodMs, Action... actions) {
this(periodMs, Arrays.asList(actions));
}
@Override
protected void runOneIteration() {
if (actions.isEmpty()) {
this.stop("done");
return;
}
Action action = actions.remove(0);
try {
action.perform();
} catch (Exception ex) {
LOG.warn("Exception occured during performing action: "
+ StringUtils.stringifyException(ex));
}
}
@Override
public void init(PolicyContext context) throws Exception {
super.init(context);
for (Action action : actions) {
action.init(this.context);
}
}
}