/**
 * Copyright (c) 2010 Yahoo! Inc. All rights reserved.
 * Licensed 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. See accompanying LICENSE file.
 */
package org.apache.oozie.command;

import org.apache.oozie.client.Job;

/**
 * This is transition Base commands for all the jobs.
 */
public abstract class KillTransitionXCommand extends TransitionXCommand<Void> {

    public KillTransitionXCommand(String name, String type, int priority) {
        super(name, type, priority);
    }

    public abstract void killChildren() throws CommandException;

    /* (non-Javadoc)
     * @see org.apache.oozie.command.TransitionXCommand#transitToNext()
     */
    @Override
    public final void transitToNext() {
        if (job == null) {
            job = this.getJob();
        }
        job.setStatus(Job.Status.KILLED);
        job.setPending();
    }

    /* (non-Javadoc)
     * @see org.apache.oozie.command.TransitionXCommand#execute()
     */
    @Override
    protected Void execute() throws CommandException {
        try {
            transitToNext();
            killChildren();
            updateJob();
        }
        finally {
            notifyParent();
        }
        return null;
    }
}