/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jbpm.jpdl.internal.activity;
import java.util.ArrayList;
import java.util.List;
import org.jbpm.api.Execution;
import org.jbpm.api.activity.ActivityExecution;
import org.jbpm.pvm.internal.model.Activity;
import org.jbpm.pvm.internal.model.Condition;
import org.jbpm.pvm.internal.model.ExecutionImpl;
import org.jbpm.pvm.internal.model.Transition;
/**
* @author Tom Baeyens
*/
public class ForkActivity extends JpdlActivity {
private static final long serialVersionUID = 1L;
public void execute(ActivityExecution execution) {
execute((ExecutionImpl)execution);
}
public void execute(ExecutionImpl execution) {
Activity activity = execution.getActivity();
// evaluate the conditions and find the transitions that should be forked
List<Transition> forkingTransitions = new ArrayList<Transition>();
List<Transition> outgoingTransitions = activity.getOutgoingTransitions();
for (Transition transition: outgoingTransitions) {
Condition condition = transition.getCondition();
if ( (condition==null)
|| (condition.evaluate(execution))
) {
forkingTransitions.add(transition);
}
}
// if no outgoing transitions should be forked,
if (forkingTransitions.size()==0) {
// end this execution
execution.end();
// if there is exactly 1 transition to be taken, just use the incoming execution
} else if (forkingTransitions.size()==1) {
execution.take(forkingTransitions.get(0));
// if there are more transitions
} else {
ExecutionImpl concurrentRoot = null;
if (Execution.STATE_ACTIVE_ROOT.equals(execution.getState())) {
concurrentRoot = execution;
execution.setState(Execution.STATE_INACTIVE_CONCURRENT_ROOT);
execution.setActivity(null);
} else if (Execution.STATE_ACTIVE_CONCURRENT.equals(execution.getState())) {
concurrentRoot = execution.getParent();
}
for (Transition transition: forkingTransitions) {
// launch a concurrent path of execution
String childExecutionName = transition.getName();
ExecutionImpl concurrentExecution = concurrentRoot.createExecution(childExecutionName);
concurrentExecution.setActivity(activity);
concurrentExecution.setState(Execution.STATE_ACTIVE_CONCURRENT);
concurrentExecution.take(transition);
if (concurrentRoot.isEnded()) {
break;
}
}
}
}
}