Creating orchestration instance, what does mean?

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    • May 19, 2009 at 10:38 AM #22404
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        Hi,

        A newbie question on orchestrations.

        Can someone explain what does this sentence mean in practical? this is taken from Microsoft Biztalk site

        “The orchestration engine executes orchestrations by creating individual instances of the business process.” 

        What does the engine do exactly? runs a stored procedure, or a process then which one?  or something else?

         

        Thanks

         

      • May 19, 2009 at 11:50 AM #22407
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          My (limited) understanding is the orchestration is converted into class(es) in a C# like language, X# ?

          Then each orchestration instance is a case of instantiating the class(es), in the same way your C# class is instantitated (assuming it’s not a static)

          • May 19, 2009 at 12:31 PM #22408
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              The language is C#.

              Each instantiated class exists for the life of the orchestration. It is serialized into the MessageBoxDb at certain persistence points. All the messages, variables and the processing state are saved. If your Biztalk server is switched off, the orchestration will restart from the last persistence point. If your orchestration has a long wait then it is persisted and removed from memory (dehydrated) and can be rehydrated when the event it was waiting for occurs.

              • May 20, 2009 at 3:28 AM #22423
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                  Hi,

                  I think i get it now

                  Orchestrations are
                  defined in a BizTalk Visual Studio project, and are compiled into .NET
                  classes that implement the BTXService interface.   At run time, the XLANG/s sub-service creates instances of these classes.  Each instance is an in-memory state machine that receives, processes and returns messages to and from the MessageBox.

                   

                  This is taken from Charles Young blog titled “How Subscription works“

                  http://geekswithblogs.net/cyoung/articles/7007.aspx

                   

                  Thanks




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