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.oozie.command;
019
020import org.apache.oozie.client.Job;
021
022/**
023 * This is transition Base commands for all the jobs.
024 */
025public abstract class KillTransitionXCommand<T> extends TransitionXCommand<T> {
026    protected T ret;
027
028    public KillTransitionXCommand(String name, String type, int priority) {
029        super(name, type, priority);
030    }
031
032    public abstract void killChildren() throws CommandException;
033
034    /* (non-Javadoc)
035     * @see org.apache.oozie.command.TransitionXCommand#transitToNext()
036     */
037    @Override
038    public void transitToNext() {
039        if (job == null) {
040            job = this.getJob();
041        }
042        job.setStatus(Job.Status.KILLED);
043        job.setPending();
044    }
045
046    /* (non-Javadoc)
047     * @see org.apache.oozie.command.TransitionXCommand#execute()
048     */
049    @Override
050    protected T execute() throws CommandException {
051        try {
052            transitToNext();
053            killChildren();
054            updateJob();
055            performWrites();
056        }
057        finally {
058            notifyParent();
059        }
060        return ret;
061    }
062}