/*
* 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.graph.node;
import java.util.Collection;
import org.jbpm.graph.def.Node;
import org.jbpm.graph.exe.ExecutionContext;
import org.jbpm.graph.exe.Token;
/**
* TODO is the merge node useful ?
* i don't think the merge node is useful because every node has an
* implicit merge in front of it (= multiple transitions can arrive in
* the same node). maybe we should just leave this in for the sake
* of workflow patterns ?
*/
public class Merge extends Node {
private static final long serialVersionUID = 1L;
boolean isSynchronized = false;
public Merge() {
}
public Merge(String name) {
super(name);
}
public void execute(ExecutionContext executionContext) {
Token token = executionContext.getToken();
Node mergeNode = token.getNode();
// if this is a simple merge
if ( ! isSynchronized ) {
mergeNode.leave(executionContext);
// this is a synchronizing multi merge
} else {
Collection<Token> concurrentTokens = token.getParent().getChildren().values();
boolean reactivate = true;
for (Token concurrentToken : concurrentTokens) {
if (! mergeNode.equals(concurrentToken.getNode())) {
reactivate = false;
break;
}
}
if ( reactivate ) {
for (Token concurrentToken : concurrentTokens) {
mergeNode.leave(new ExecutionContext(concurrentToken));
}
}
}
}
public boolean isSynchronized() {
return isSynchronized;
}
public void setSynchronized(boolean isSynchronized) {
this.isSynchronized = isSynchronized;
}
}