/*
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* JBoss, Home of Professional Open Source
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* Copyright 2005, JBoss Inc., and individual contributors as indicated
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* by the @authors tag. See the copyright.txt in the distribution for a
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* full listing of individual contributors.
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this software; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
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*/
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package org.jbpm.pvm.internal.jobexecutor;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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import javax.transaction.Synchronization;
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import org.jbpm.api.JbpmException;
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import org.jbpm.api.cmd.Command;
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import org.jbpm.api.cmd.Environment;
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import org.jbpm.internal.log.Log;
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import org.jbpm.pvm.internal.cmd.CommandService;
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import org.jbpm.pvm.internal.job.JobImpl;
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import org.jbpm.pvm.internal.session.DbSession;
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import org.jbpm.pvm.internal.tx.Transaction;
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/**
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* @author Tom Baeyens
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*/
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public class JobExceptionHandler implements Synchronization, Command<Object> {
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private static final Log log = Log.getLog(JobExceptionHandler.class.getName());
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private static final long serialVersionUID = 1L;
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protected CommandService commandService;
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protected long jobDbid;
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protected Throwable exception;
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public JobExceptionHandler(long jobDbid, Throwable exception, CommandService commandService) {
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this.commandService = commandService;
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this.jobDbid = jobDbid;
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this.exception = exception;
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}
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public void beforeCompletion() {
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}
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public void afterCompletion(int status) {
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// after the transaction rolled back,
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// execute this job exception handler object as a command with
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// the command service so that this gets done in a separate
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// transaction
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log.debug("starting new transaction for handling job exception");
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commandService.execute(this);
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log.debug("completed transaction for handling job exception");
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}
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public Object execute(Environment environment) throws Exception {
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log.debug("handling job "+jobDbid+" exception: "+exception.getMessage());
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// load the job from the db
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DbSession dbSession = environment.get(DbSession.class);
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if (dbSession==null) {
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throw new JbpmException("no job-session configured to handle job");
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}
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JobImpl<?> job = (JobImpl<?>) dbSession.get(JobImpl.class, jobDbid);
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// serialize the stack trace
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StringWriter sw = new StringWriter();
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exception.printStackTrace(new PrintWriter(sw));
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if (job != null) {
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// decrement the number of retries
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int decrementedRetries = job.getRetries()-1;
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log.debug("decrementing retries to "+decrementedRetries+" for "+job);
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job.release();
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job.setRetries(decrementedRetries);
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job.setException(sw.toString());
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// notify the job executor after the transaction is completed
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Transaction transaction = environment.get(Transaction.class);
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JobExecutor jobExecutor = environment.get(JobExecutor.class);
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if ( (transaction!=null)
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&& (jobExecutor!=null)
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) {
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log.trace("registering job executor notifier with "+transaction);
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transaction.registerSynchronization(new JobAddedNotification(jobExecutor));
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}
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}
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return null;
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}
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}
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