/*
* 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.hibernate.LockMode;
import org.hibernate.Session;
import org.jbpm.api.Execution;
import org.jbpm.api.JbpmException;
import org.jbpm.api.activity.ActivityExecution;
import org.jbpm.pvm.internal.env.Environment;
import org.jbpm.pvm.internal.model.Activity;
import org.jbpm.pvm.internal.model.ExecutionImpl;
import org.jbpm.pvm.internal.model.Transition;
/**
* @author Tom Baeyens
*/
public class JoinActivity extends JpdlActivity {
private static final long serialVersionUID = 1L;
int multiplicity = -1;
LockMode lockMode = LockMode.UPGRADE;
public void execute(ActivityExecution execution) {
execute((ExecutionImpl)execution);
}
public void execute(ExecutionImpl execution) {
Activity activity = execution.getActivity();
// if this is a single, non concurrent root
if (Execution.STATE_ACTIVE_ROOT.equals(execution.getState())) {
// just pass through
Transition transition = activity.getDefaultOutgoingTransition();
if (transition==null) {
throw new JbpmException("join must have an outgoing transition");
}
execution.take(transition);
} else if (Execution.STATE_ACTIVE_CONCURRENT.equals(execution.getState())) {
// force version increment in the parent execution
Session session = Environment.getFromCurrent(Session.class);
session.lock(execution.getParent(), lockMode);
execution.setState(Execution.STATE_INACTIVE_JOIN);
execution.waitForSignal();
ExecutionImpl concurrentRoot = execution.getParent();
List<ExecutionImpl> joinedExecutions = getJoinedExecutions(concurrentRoot, activity);
if (isComplete(joinedExecutions, activity)) {
endJoinedExecutions(joinedExecutions);
ExecutionImpl outgoingExecution = null;
if (concurrentRoot.getExecutions().size()==0) {
outgoingExecution = concurrentRoot;
outgoingExecution.setState(Execution.STATE_ACTIVE_ROOT);
} else {
outgoingExecution = concurrentRoot.createExecution();
outgoingExecution.setState(Execution.STATE_ACTIVE_CONCURRENT);
}
execution.setActivity(activity, outgoingExecution);
Transition transition = activity.getDefaultOutgoingTransition();
if (transition==null) {
throw new JbpmException("join must have an outgoing transition");
}
outgoingExecution.take(transition);
}
} else {
throw new JbpmException("invalid execution state");
}
}
protected boolean isComplete(List<ExecutionImpl> joinedExecutions, Activity activity) {
int nbrOfExecutionsToJoin = multiplicity;
if (multiplicity==-1) {
nbrOfExecutionsToJoin = activity.getIncomingTransitions().size();
}
return joinedExecutions.size()==nbrOfExecutionsToJoin;
}
protected List<ExecutionImpl> getJoinedExecutions(ExecutionImpl concurrentRoot, Activity activity) {
List<ExecutionImpl> joinedExecutions = new ArrayList<ExecutionImpl>();
List concurrentExecutions = (List)concurrentRoot.getExecutions();
for (ExecutionImpl concurrentExecution: (List<ExecutionImpl>)concurrentExecutions) {
if ( (Execution.STATE_INACTIVE_JOIN.equals(concurrentExecution.getState()))
&& (concurrentExecution.getActivity()==activity)
) {
joinedExecutions.add(concurrentExecution);
}
}
return joinedExecutions;
}
protected void endJoinedExecutions(List<ExecutionImpl> joinedExecutions) {
for (ExecutionImpl joinedExecution: joinedExecutions) {
joinedExecution.end();
}
}
public void setMultiplicity(int multiplicity) {
this.multiplicity = multiplicity;
}
public void setLockMode(LockMode lockMode) {
this.lockMode = lockMode;
}
}