Split Events

[rsoika]

In order to support parallel gateways the workflowKernel should create versions depending on the model.
In case a event is followed by a parallel gateway for each output evaluating to false a new version of the current process instance should be created

The idea is to support Models like this one:

Solution

To solve the problem of the Master/Version instance the kernel evaluates conditions the output flows. If a condition evaluates to true than this is the flow for the master version (current process instance)
For each output evaluated to 'false' a new cloned version of the current process instance is created.
If the output is a event, than the new version will be processed.

[rsoika]

The worklfowKernel should throw a exception if no true condition is found in the outcome of the split gateway

[rsoika]

A parallel-gateway event must be followed by an event for each outcome. Otherwise the new version is in an undefined state.
Triggering the in-going event multiple times is not solution because of business logic consistency (e.g. same email would be send multiple times)

[rsoika]

remove $workitemIDRef and replace this attribute with $UNIQUEIDSOURCE

[rsoika]

add temporary attribute $isversion...