org.apache.oozie.command.StartTransitionXCommand Maven / Gradle / Ivy
/**
* 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;
/**
* Transition command for start the job. The derived class has to override these following functions:
*
* loadState() : load the job's and/or actions' state
* updateJob() : update job status and attributes
* StartChildren() : submit or queue commands to start children
* notifyParent() : update the status to upstream if any
*/
public abstract class StartTransitionXCommand extends TransitionXCommand {
/**
* The constructor for abstract class {@link StartTransitionXCommand}
*
* @param name the command name
* @param type the command type
* @param priority the command priority
*/
public StartTransitionXCommand(String name, String type, int priority) {
super(name, type, priority);
}
/**
* The constructor for abstract class {@link StartTransitionXCommand}
*
* @param name the command name
* @param type the command type
* @param priority the command priority
* @param dryrun true if dryrun is enable
*/
public StartTransitionXCommand(String name, String type, int priority, boolean dryrun) {
super(name, type, priority, dryrun);
}
/**
* Start actions associated with the job
*
* @throws CommandException thrown if failed to start actions
*/
public abstract void StartChildren() 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.RUNNING);
job.resetPending();
}
/* (non-Javadoc)
* @see org.apache.oozie.command.TransitionXCommand#execute()
*/
@Override
protected Void execute() throws CommandException {
transitToNext();
updateJob();
StartChildren();
notifyParent();
return null;
}
}