[jboss-user] [JBoss jBPM] - Re: How to best control access from multiple threads to a Pr

[kukeltje]

anonymous wrote : 
  | I think, perhaps, my first post was a bit too abstract to be clear. So... here is a more concrete example.
  | 
Thanks, that always helps

anonymous wrote : E(mail) will provide J(bpm)  with delivery notification and read receipt information via http callbacks. 
  | I hope it is an internal emailing system where users have no control over whether or not they send de read notification.


anonymous wrote :  think that you are saying that I could model this in a different way, using tokens to ensure that the two async events are handled correctly (i.e. thread J2 will signal the "delivery" token and thread J3 will signal the "read" token. For example:
  | 
  | 
  | 
  |   | 
  |   |                         start
  |   |                            |
  |   |                            |
  |   |                            V
  |   |                         send email via http
  |   |                            |
  |   |                            |
  |   |                            V
  |   |        +------------------fork------------------+
  |   |        |                                        |
  |   |        V                                        V                 
  |   |     wait for delivery receipt                wait for read receipt
  |   |        |                                        |
  |   |        |                                        |
  |   |        V                                        V
  |   |     send delivery receipt via http           send read receipt via http
  |   |        |                                        |
  |   |        |                                        |
  |   |        +------------------join------------------+    
  |   |                            |
  |   |                            |
  |   |                            V    
  |   |                           end
  |   | 
  | 
  | Have I understood you correctly?

Yes, and if you want to prevent  de read-receipt being send to the P system before or at the same time as the  delivery-receipt, you could also model it like this


  |                         start
  |                            |
  |                            |
  |                            V
  |                         send email via http
  |                            |
  |                            |
  |                            V
  |        +------------------fork------------------+
  |        |                                        |
  |        V                                        V                 
  |     wait for delivery receipt                wait for read receipt
  |        |                                        |
  |        |                                        |
  |        V                                        |
  |     send delivery receipt via http              |  
  |        |                                        |
  |        |                                        |
  |        +------------------join------------------+    
  |                            |
  |                            |
  |                send read receipt via http
  |                            |
  |                            |
  |                            V    
  |                           end
  | 
  | 
  | 



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