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.wf;
019    
020    import java.io.IOException;
021    import java.net.URI;
022    import java.net.URISyntaxException;
023    
024    import org.apache.hadoop.conf.Configuration;
025    import org.apache.hadoop.fs.FileSystem;
026    import org.apache.hadoop.fs.Path;
027    import org.apache.oozie.ErrorCode;
028    import org.apache.oozie.client.WorkflowJob;
029    import org.apache.oozie.command.CommandException;
030    import org.apache.oozie.command.PreconditionException;
031    import org.apache.oozie.service.HadoopAccessorException;
032    import org.apache.oozie.service.HadoopAccessorService;
033    import org.apache.oozie.service.Services;
034    
035    /**
036     * This Command is expected to be called when a Workflow moves to any terminal
037     * state ( such as SUCCEEDED, KILLED, FAILED). This class primarily removes the
038     * temporary directory created for specific workflow id
039     */
040    public class WfEndXCommand extends WorkflowXCommand<Void> {
041    
042        private WorkflowJob job = null;
043    
044        public WfEndXCommand(WorkflowJob job) {
045            super("wf_end", "wf_end", 1);
046            this.job = job;
047        }
048    
049        @Override
050        protected Void execute() throws CommandException {
051            LOG.debug("STARTED WFEndXCommand " + job.getId());
052            deleteWFDir();
053            LOG.debug("ENDED WFEndXCommand " + job.getId());
054            return null;
055        }
056    
057        private void deleteWFDir() throws CommandException {
058            FileSystem fs;
059            try {
060                fs = getAppFileSystem(job);
061                String wfDir = Services.get().getSystemId() + "/" + job.getId();
062                Path wfDirPath = new Path(fs.getHomeDirectory(), wfDir);
063                LOG.debug("WF tmp dir :" + wfDirPath);
064                if (fs.exists(wfDirPath)) {
065                    fs.delete(wfDirPath, true);
066                }
067                else {
068                    LOG.debug("Tmp dir doesn't exist :" + wfDirPath);
069                }
070            }
071            catch (Exception e) {
072                LOG.error("Unable to delete WF temp dir of wf id :" + job.getId(), e);
073                throw new CommandException(ErrorCode.E0819, job.getId(), e);
074            }
075    
076        }
077    
078        protected FileSystem getAppFileSystem(WorkflowJob workflow) throws HadoopAccessorException, IOException,
079                URISyntaxException {
080            URI uri = new URI(workflow.getAppPath());
081            HadoopAccessorService has = Services.get().get(HadoopAccessorService.class);
082            Configuration fsConf = has.createJobConf(uri.getAuthority());
083            return has.createFileSystem(workflow.getUser(), uri, fsConf);
084        }
085    
086        @Override
087        public String getEntityKey() {
088            return job.getId();
089        }
090    
091        @Override
092        protected boolean isLockRequired() {
093            return false;
094        }
095    
096        @Override
097        protected void loadState() throws CommandException {
098    
099        }
100    
101        @Override
102        protected void verifyPrecondition() throws CommandException, PreconditionException {
103    
104        }
105    
106    }