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    package org.apache.oozie.command;
019    
020    import org.apache.oozie.client.Job;
021    
022    public abstract class SuspendTransitionXCommand extends TransitionXCommand<Void> {
023    
024        /**
025         * Suspend all children of the job
026         *
027         * @throws CommandException
028         */
029        public abstract void suspendChildren() throws CommandException;
030    
031        public SuspendTransitionXCommand(String name, String type, int priority) {
032            super(name, type, priority);
033        }
034    
035        public SuspendTransitionXCommand(String name, String type, int priority, boolean dryrun) {
036            super(name, type, priority, dryrun);
037        }
038    
039        /**
040         * Transit job to suspended from running or to prepsuspended from prep.
041         *
042         * @see org.apache.oozie.command.TransitionXCommand#transitToNext()
043         */
044        @Override
045        public void transitToNext() {
046            if (job == null) {
047                job = this.getJob();
048            }
049            if (job.getStatus() == Job.Status.PREP) {
050                job.setStatus(Job.Status.PREPSUSPENDED);
051            }
052            else if (job.getStatus() == Job.Status.RUNNING) {
053                job.setStatus(Job.Status.SUSPENDED);
054            }
055            else if (job.getStatus() == Job.Status.RUNNINGWITHERROR || job.getStatus() == Job.Status.PAUSEDWITHERROR){
056                job.setStatus(Job.Status.SUSPENDEDWITHERROR);
057            }
058            else if (job.getStatus() == Job.Status.PAUSED) {
059                job.setStatus(Job.Status.SUSPENDED);
060            }
061            else if (job.getStatus() == Job.Status.PREPPAUSED) {
062                job.setStatus(Job.Status.PREPSUSPENDED);
063            }
064            job.setPending();
065        }
066    
067        /* (non-Javadoc)
068         * @see org.apache.oozie.command.XCommand#execute()
069         */
070        @Override
071        protected Void execute() throws CommandException {
072            transitToNext();
073            try {
074                suspendChildren();
075                updateJob();
076                performWrites();
077            } finally {
078                notifyParent();
079            }
080            return null;
081        }
082    }