Displaying items by tag: process model

Often, when I am out and about delivering BPMN training to our clients, I am asked if it is possible to model the ability to “undo” certain actions within a process model.

The answer is of course yes, BPMN 2.0 provides us with the necessary tools to show this kind of action via transaction modelling.

As you may or may not know, BPMN 2.0 is broken down into several disciplines, see below:

The tools offered by the notation that allow us to undertake transaction modelling fall firmly into the realm of Analytical Modelling.

This means that for users of Sparx Systems Enterprise Architect, we will find everything we need in the toolboxes for BPMN Collaboration and Process diagrams.

Elements for Transaction Modelling

When we say Transaction in reference to BPMN 2.0, we are in fact talking about a Transaction Sub-Process. A Transaction Sub-Process refers to the coordinated execution of multiple activities such that they will all complete successfully or, in the event of a cancellation, the activities are rolled back to a state equivalent to none of them completing. To create a Transaction in Enterprise Architect, you first need to create a Sub-Process and then set the Tagged Value isATransaction in the element properties:

The Cancel Event is an interrupting boundary event that can only be used on the boundary of a Transaction Sub-Process. This event will be triggered should the Transaction reach a state in which a Cancel End Event has been reached. The event will then Cancel (not just a clever name) all successfully completed activities within the Transaction that have defined compensating activities and undo them so that they are in a state equal to none of them having been completed.

The Cancel End Event is a type of BPMN 2.0 End Event that is used within a Transaction Sub-Process. Should this End Event be reached within a Transaction Sub-Process, it will then trigger the Cancel Event attached to the boundary of the Transaction.

When undertaking Transaction Modelling, should we wish to undo the Activities contained within the Transaction Sub-Process, then alongside the Cancel event types we will also need to employ Compensation Events and Compensating Activities. An Activity can only be rolled back if it has a Compensation Event set as an interrupting boundary event. This will then need to be connected to a Compensation Activity (or Sub-Process) via the Association relationship. To mark an activity for compensation in Enterprise Architect, you will need to access the element properties and set the tagged value isForCompensation to true:

The Compensation End Event allows us to model a process where we have an option to defer rollback until later on in the process. When triggered, this End Event will terminate the process and will itself trigger any Compensation Events within the process, and by association any Compensating Activities, allowing us to rollback after the successful completion of our Transactions.

Approaches to Transaction Modelling

Self-Cancelling

When talking about transaction modelling and the phrase “self-cancelling activities” comes up, it is referring to any activities (including Sub-Processes) within a transaction that can be undone should a Cancel End Event be triggered.

A Transaction can contain a single or multiple self cancelling activities.

In the example below we can see that we have a Transaction Sub-Process (modelled as expanded) that contains multiple activities that can be undone when the Compensation Events are triggered by the Cancel Events.

Each of these compensable activities is then linked to a Service Task that is marked for compensation, and it is this Compensation Activity that roles the others back to a state where none of them have been completed.

Deferred Cancellation

Deferred cancellation of activities happens when we model a way for our Transaction Sub-Processes to be undone after they have been successfully completed. We do this by implementing a Compensation End Event somewhere in our possible sequence of events. An example of this is shown in the process below:

This concludes our look at Transaction Modelling in BPMN 2.0, I hope you found it a useful explanation.

How can Dunstan Thomas help you with BPMN 2.0?

Dunstan Thomas have been Sparx Systems partners for the last 18 years, delivering training and consulting services around Enterprise Architect to organisations spanning multiple markets.

Leverage the knowledge and experience of our expert consultants to supplement your teams with services such as:

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