Has anyone attempted to implement a data flow representation of the process 
graph using jBPM? In data flow, nodes would have inputs and outputs of 
different types. Output ports of nodes could be hooked together with compatible 
input ports of other nodes. Then, object instances could be "passed" from node 
to node throughout the graph. For example, let's say you created a database 
connection in the first node of a graph and another node later in the graph 
also takes a database connection as an input. Using dataflow, the first node 
could declare an output that could be hooked to the input of the node later in 
the graph.

I would think process variables could be used to implement this, but input and 
output constructs would need to be added to the jpdl. And, the workflow engine 
would have to do a little work passing the data around and type checking.

Any other thoughts? Has anyone tried to do this?


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