(jbpm:3.0.2)
Hi there,
I have following use case:
+----+
| |Fork|
| +----+
| / \
| +--------+ +-------+
| |State A | |State B|
| +--------+ +-------+
| \ /
| +-----+
| |Join |
| +-----+
Now I want to execute all 4 possible cases:
A B
0 0: execute none of the (task)nodes, proceed with join
0 1: execute only State B
1 0: execute only State A
1 1: execute both States
There are controller variables in the context that decide whether the state
should be executed or not.
So I tried a simple conditioned transition:
<fork name="fork1>
| <transition name="toStateA" to="State A">
| <script>
| <expression>isStateA.booleanValue()</expression>
| </script>
| </transition>
| <transition name="toStateB" to="State B">
| <script>
| <expression>isStateB.booleanValue()</expression>
| </script>
| </transition>
| </fork>
But the beanshell scripts dont get considered and it forks into both
transitions.
When you throw a look on the Fork class:
public void execute(ExecutionContext executionContext) {
| Token token = executionContext.getToken();
| Node forkNode = token.getNode();
|
| // phase one: collect all the transitionNames
| Collection transitionNames = null;
| List forkedTokens = new ArrayList();
|
| // by default, the fork spawns a token for each leaving transition
| if (script==null) {
| transitionNames = forkNode.getLeavingTransitionsMap().keySet();
|
| } else { // a script is specified
| // if a script is specified, use that script to calculate the set
| // of leaving transitions to be used for forking tokens.
| Map outputMap = script.eval(token);
| if (outputMap.size()==1) {
| Object result = outputMap.values().iterator().next();
| if (result instanceof Collection) {
| transitionNames = (Collection) result;
| }
| }
| if (transitionNames==null) {
| throw new RuntimeException("script for fork '"+name+"' should
produce one collection (in one writable variable): "+transitionNames);
| }
| }
| ...
You see, that there has to be directly a script under the fork-node, and that
script has to have a list of the transition names as output.
Ok, I could bybas this trouble by using several decision nodes (in this case 1
with 4 leaving Transition: ->A, ->B, ->fork, ->the node after the join), but if
have more than 2 childs, it would quickly get very complicated.
So, what do you recommend? Maybe its still possible with the the current
(3.0.2) API/JPDL, maybe I missed some point.
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