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.oozie.command;
020
021import org.apache.oozie.client.Job;
022
023/**
024 * This is transition Base commands for all the jobs.
025 */
026public abstract class KillTransitionXCommand<T> extends TransitionXCommand<T> {
027    protected T ret;
028
029    public KillTransitionXCommand(String name, String type, int priority) {
030        super(name, type, priority);
031    }
032
033    public abstract void killChildren() throws CommandException;
034
035    /* (non-Javadoc)
036     * @see org.apache.oozie.command.TransitionXCommand#transitToNext()
037     */
038    @Override
039    public void transitToNext() {
040        if (job == null) {
041            job = this.getJob();
042        }
043        job.setStatus(Job.Status.KILLED);
044        job.setPending();
045    }
046
047    /* (non-Javadoc)
048     * @see org.apache.oozie.command.TransitionXCommand#execute()
049     */
050    @Override
051    protected T execute() throws CommandException {
052        try {
053            transitToNext();
054            killChildren();
055            updateJob();
056            performWrites();
057        }
058        finally {
059            notifyParent();
060        }
061        return ret;
062    }
063}