[jboss-dev-forums] [Design of JBoss ESB] - Re: StartProcessInstanceCommand: Return token id/process ins

[apestel]

"Kevin.Conner at jboss.com" wrote : There are other reasons why a process instance is not guaranteed to work in a synchronous manner on the calling thread, such as timers, human intervention, ESB invocations and possibly others.  In general this is not something that the invoker of the process instance can control.

For clarity to make sure I understand, let's say that we remove ESB from the picture and we have a customer just using jBPM.  They create a web application that accepts a bunch of form data for a loan application and on submission, the web app creates a jBPM process instance with the form data and signals it  which does credit check, loan rate calculation, maybe other steps, and then finishes by producing a loan result in a jBPM process variable.  When the process finishes (signal returns after couple seconds), the web app extracts the loan result from the finished jBPM process and displays it in a web page to the user.

Would we say that is improper use of jBPM and the web app should instead signal the jBPM process in a separate thread, block the web app thread, implement the jBPM process with some sort of callback at process completion, and wait for the jBPM process to call back to the web application when it has completed so that the web application can get the jBPM process variable with the loan result and render that in the page returned to the user?

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