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New in RSA 8.0.4:Choreographies in BPMN

October, 2011

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Choreographies in RSA BPMN

In choreography, the focus is on exchange of information (messages) between the participants, while hiding the details of the work performed within these participants. A sample is shown below.

Each collaboration can be represented by a corresponding choreography. Next, you will see a collaboration whose corresponding choreography is the sample choreography above.

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Choreographies in RSA BPMN

Corresponding collaboration:

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Choreography Task

A choreography task is an atomic activity in a choreography. It represents one or two message exchanges between two participants.

You can create a choreography task from the palette. Initiating message flow is automatically created and cannot be deleted. You can add a message to it, and you can add non-initiating message flow with or without a message. Below is a sample choreography task and its general property tab.

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Global Choreography Task

A global choreography task is a reusable choreography task that can be called from within any choreography by a call choreography. It consists of participants and message flows intended for reuse.

To add a new global choreography task, right click on the Global Choreography Tasks folder in the Project Explorer. Screenshot below show a sample of a global choreography task. Next slide shows its Participants property tab (top) and Message Flows property tab (bottom)

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Global Choreography Task

Global choreography task does not have a visual representation on the diagram. It can be called from a call choreography.

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Call Choreography

Call choreography identifies a point where another choreography or a global choreography task is used. The call choreography acts as a placeholder for the inclusion of the choreography element it is calling.

One way to create a call choreography is to drag its called element (choreography or global choreography task) from the Project Explorer onto the diagram. It can also be created from the palette. Below is a sample screenshot of the call choreography whose called element is the global choreography task from the previous example.

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Call Choreography

A participant from the called choreography (inner participant) can be mapped to a participant from the choreography that contains the call choreography (outer participant) on the Participant Associations property tab.

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Common Elements in Choreographies

Some events and gateways are supported by choreographies.

Sequence flows and text associations are the only kinds of connections supported.

There is a restriction on when two choreography activities can be connected by the sequence flow: the initiating participant of the target choreography activity must have been involved in the source choreography activity.