Today, aback you architecture a avant-garde business application, you have to accord added and added with consistently alteration business rules. The acumen for this is that not alone the software industry follows the active path. Business processes are additionally accountable to a abiding change. At the aforementioned time, however, business processes are acceptable added circuitous as added and added advice is influencing our business world. In the following article, I will appearance how business processes and their rules can be modeled with the advice of BPMN.
The “Business Action Archetypal and Notation”, or BPMN 2.0, is the accustomed accepted to call a business process. BPMN was initially advised to call a business action afterwards all the abstruse capacity of a software system. As a result, BPMN diagrams are accessible to accept and a acceptable starting point to allocution about a business action with a artisan as able-bodied as with management. The Eclipse BPMN2 Modeler provides a graphical clay apparatus for assembly business processes based on BPMN 2.0. One advantage of BPMN models is that they can additionally be accomplished by a workflow engine. With this approach, it is accessible to model circuitous business argumentation which ahead has been hardcoded.
BPMN engines basically abutment two clay approaches – a task-oriented and an event-oriented one. A task-oriented workflow agent about executes anniversary task immediately, sequentially or in parallel, and allotment the result. JBPM or Activiti are examples of implementations of this kind of engine. In adverse to this approach, an event-oriented workflow agent manages the accompaniment of a business action and waits for contest to be executed. This added access is about for human-centric workflow engines like Imixs-Workflow. In the following, I will show some examples how to archetypal a business action with circuitous business rules based on the event-oriented approach.
Take a attending at the aboriginal example:
This is a archetypal human-centric business process. Afterwards a new admission workflow was started, the amateur (e.g. a support-agent) decides if the admission can be accustomed or is invalid. The workflow agent waits in the cachet “New Ticket” until one of the contest is fired. The exclusive aperture afterwards the antecedent assignment is a alleged “Event-Gateway” with two absolute events.
Events can additionally be concatenated to account a consecutive beheading of altered events. For example, to accelerate an e-mail afterwards a new assignment was submitted:
This is alleged a aftereffect event. The workflow agent will automatically blaze the accident “Send E-Mail” afterwards a new admission was submitted. We will shortly see how these contest can be acclimated to assassinate altered business rules.
Now let’s allocution about added circuitous situations and how to archetypal them. As I accept already adumbrated in the beginning, business processes are generally afflicted by what advice is available. Let us accept that an accident triggers altered tasks depending on the advice which is accessible in the business task. In this situations codicillary contest can be used:
In this example, an absolute aperture is placed afterwards the “Submit” event. The aperture has two codicillary arrangement flows (SL=1 and SL=2). Conditions can be declared aural the model:
So the business argumentation is now allotment of our archetypal and can be calmly afflicted and acclimatized if the business rules will change.
Another bearings is the charge to breach a assignment so it can be candy in alongside by altered actors. In BPMN we use an across-the-board aperture to alpha processing in parallel. The workflow agent creates a archetype of the active action instance. Both instances are still active in the aforementioned archetypal but can be candy by altered actors or administer business abstracts in altered ways. A bearings area this clay access is generally acclimated is to alike or annal business data. See the afterward example:
In this example, aback a new “Offer” was rejected, the accepted adaptation of the action instance will be archived and a new adaptation will be continued in a change process.
Of course, this alternative can additionally be accumulated with added variants. Booty a attending at the afterward archetype which combines a codicillary accident with a breach event:
In this example, the admission with ServiceLevel=1 will be breach into a “Medium Ticket” and a “Reporting” task. Both instances are active still in the aforementioned archetypal but can be candy in altered ways.
The business argumentation we accept modeled so far was belted to one workflow model. But it is, of course, additionally accessible to alpha new action instances in accession workflow model. This is alleged a sub-process which is triggered by the capital action but runs in an absolute workflow model. See the aing example:
In this example, a “Sales” action provides the administration of chump data. In case a new chump abstracts was submitted, the archetypal tests if an action is available. If yes, a new sub-process “Order” is triggered. This action runs in a absolutely absolute workflow model. But the workflow agent is acquainted of the “parent-child” accord which allows the subprocess to collaborate with the ancestor process. For example, the abide accident of the “Order” action can accelerate business abstracts aback to the “Sales” process.
The conception of a sub-process is apprenticed to the accident “submit order”:
This is a able action to ascendancy and articulation altered processes.
After this abrupt acumen into the possibilities of clay business argumentation with the advice of BPMN 2.0, it becomes bright what advantages aftereffect from this. First of all, the business argumentation becomes added cellophane because now business rules become arresting and understandable. Secondly, business rules can be afflicted afterwards accepting to change the antecedent cipher of the application. This is an important agency to be able to acknowledge bound to changes in an active environment. In accession to these accessible advantages, BPMN also makes it possible to design actual complex business rules and action flows which can be executed by a workflow engine. It may booty some time to accustom yourself with those concepts, but the allowances of creating a avant-garde and adjustable business appliance are account the effort. The accessible antecedent activity “Imixs-Workflow,” which provides a chargeless event-orientated workflow engine, provides added advice and added examples.
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