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Technical Overview

Components

graph TD
subgraph spiff-arena
    Backend
    Frontend
end
subgraph Backend
    subgraph SpiffWorkflow lib
    end
end
subgraph Frontend
    subgraph bpmn-js-spiffworkflow lib
    end
end
Frontend -- uses REST API --> Backend
Backend -- delegates to --> C
Backend -- persists to --> DB
DB[(mysql/postgres)]
C[Connector Proxy]

SpiffArena is a system that allows users to build and execute BPMN diagrams. It is composed of three applications, spiffworkflow-frontend, spiffworkflow-backend, and, optionally, a connector proxy.

Source code layout

From a source code perspective, there are three repositories that may be of interest:

spiff-arena - Includes spiffworkflow-frontend, spiffworkflow-backend, and connector-proxy-demo.
SpiffWorkflow - The core SpiffWorkflow library, 10 years old, Python, awesome, well-documented.
bpmn-js-spiffworkflow - The frontend library that extends bpmn-js to work with SpiffWorkflow.