BPMNengine

BPMNengine is an open-source BPMN 2.0 workflow engine implemented for JavaScript environments, including Node.js. It provides a runtime for executing business processes defined in BPMN 2.0 XML. The engine focuses on parsing BPMN diagrams, initializing process instances, and driving the execution of activities according to BPMN semantics.

Key features include support for common BPMN constructs such as tasks, events, gateways, sequence flows, timers, messages, and signals; an event-driven execution model that emits lifecycle events when activities start, wait, and end; and extensibility points to integrate external services or user tasks via custom handlers. It typically reads a BPMN XML file, creates a process definition, and runs instances, allowing asynchronous operations and external task coordination.

Usage patterns involve loading a BPMN diagram, creating an execution engine instance, starting execution, and subscribing to events to react to task readiness, completion, or process end. Developers can provide implementations for service tasks or user tasks and may support pausing and resuming processes as needed.

Scope and limitations: BPMNengine aims to provide core BPMN 2.0 execution in Node.js, suitable for prototyping, automation, and lightweight process orchestration. It may not cover all advanced BPMN features found in larger enterprise engines and might require additional integration for long-running human tasks or complex enterprise orchestration scenarios.

History and ecosystem: BPMNengine is a community-maintained open-source project with documentation and examples, designed to work with standard BPMN 2.0 diagrams. The project is typically hosted on a public repository with ongoing updates and community contributions.