org.jbpm.jpdl.internal.activity.JoinActivity.java Source code

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Here is the source code for org.jbpm.jpdl.internal.activity.JoinActivity.java

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/*
 * 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;
    }
}