Process as business logic

Instead of the previously used model, in which control flow and business rules are hard-coded into the code (e.g. in the form of conditional statements, loops, or service calls), using a BPMN process makes it possible to move this responsibility to the level defined as a graphical process diagram.

Such a process is the central “coordinator” of case processing in the system, controlling which steps need to be performed, in what order, and what decisions to make based on input data and intermediate results. This makes it possible to model how a given case is carried out in a clear and maintainable way.

This approach brings a number of benefits:

• Clarity and comprehensibility - the process logic is recorded in a more accessible graphical notation, making it easier to understand its flow and collaborate on its shape and development.

• Increased flexibility - changes to business logic can be introduced faster, without the need to change the code and redeploy the application.

• Better monitoring and auditability - every process run in Camunda is recorded in the history. Events and incidents can be analyzed, which greatly facilitates debugging and analysis of how the system works.

Business process definitions include elements that make it possible to map business logic in the form of a process, such as

• User Task (User Task) - User tasks are used to involve people in the process flow. They can be assigned to specific individuals, roles, or user groups. They enable activities such as approvals, data completion, manual decisions, or information verification.

• Service Task (Service Task) - Service Task enables an automatic action to be performed by the system, without human involvement. This can be a call to an external API, script, REST service, SOAP service, or another technical component.

• Gateway (Decision gateways) - gateways are used to control the flow of the process depending on whether logical conditions are met. They make it possible to model business rules that determine which path will be chosen based on process data.

• Script Task (Script Task) - enables simple operations on process data (e.g. transformations, calculations) using a scripting language (e.g. JavaScript, Groovy). Recommended only for simple operations – business logic should, as much as possible, be moved to external components.