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NET Framework 3.0 (formerly known as WinFX), a workflow API is making its debut on the Windows platform.
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At its core, a workflow API is mostly made by a toolbox of activities that, combined together, allow architects and developers to design and create realistic flows of work inside business processes.įor years, no general-purpose workflow API existed in Windows, apart from third-party commercial products. Products may differ in their runtime capabilities, set of supported activities, and because they specialize in one vertical market or another. Where do you get such a workflow API?Ī number of third-party companies have provided various workflow products for a considerable time. With a workflow API, you describe the process using activities and their connections, dependencies, and relationships. The workflow can be seen as a software program written in a meta programming language where the set of instructions is larger and more powerful than in C# or C++. The concept of a workflow is somewhat abstract and doesn’t necessarily resemble some concrete development API. A workflow describes the flow that leads to some results. In the middle, steps and connections describe a process and express some logic. To effectively model a business process, you might want to create a workflow.Ī workflow can be defined as the sequence of steps and connections that take you from a starting point to an end point. To put it succinctly, traditional programming languages are not the ideal tool to model business processes. In addition, a business process has an inherently evolving nature and architects should always favour a solution that is flexible enough to accommodate changes dynamically with limited impact on existing code and with the possibility of running quick and effective regression tests. First off, complex logic is challenging to model and highly error-prone. The more complex the process, the less appropriate such a solution would be.
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Since a business process is logic applied to objects, you can certainly describe the process using classic code, where classes model both entities and the desired flow of activities. So, how would you model a business process of any complexity? Instead, it will typically result from a chain of events that include a client request, an order, some activity, and then a payment.
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The invoice, for example, is never a standalone object in a reasonable application context. Each activity represents an action that involves one or more entities. A business process is merely the logical sum of a variety of activities. The software description of a business process results from the composition of objects that implement a behaviour. So, in the end, you may have an invoice class that knows how to create, print, update, and send an invoice.Īrmed with a variety of similar objects, can you honestly say you can model some typical business processes in an enterprise scenario? Of course, you can’t. A number of popular design patterns help you with designing the building blocks of a realistic business and data layer. With classes, you can design the entities of the domain such as invoices or products, give each entity a proper behaviour, and perhaps design a model to express dependencies between classes. In any enterprise application a significant portion of the business logic is too complex and sophisticated to be effectively expressed only in terms of classes and relationships.