Jarvis Pizzeria: Third step in Implementing the Order Processing, Correlation

In our blog entries the First Step and the Second Step there was described how multiple pizza’s could be prepared using a multi-instance subprocess. Although we saw this working correctly, the subprocess was configured to prepare pizzas sequentially, see the screenshot below:

However, due to the success of the Jarvis Pizzeria, new equipment was purchased. Two brand new ovens were installed, enabling the Jarvis enterprise to prepare three pizza’s simultaneously…awesome!

To make optimal use of our equipment we should configure the process to prepare pizzas in parallel, see the screenshot below:

Those of you who have worked with multiple asynchronous calls from the same process (or even BPEL, back in the days) should remember the need for correlating the invocation with the corresponding callback.

Lets first try this with setting up message based correlation. I.e. from the calling process we initiate a correlation with a unique key which is send to the called process. The called process returns this unique key and hence the calling process knows on which callback it has to wait.

In the properties of the “Start of Preparation” activity we have the option to initialize the correlation: Read the complete article here.

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