Workflow orchestration based on idempotent activities and read-only activities

A processing system comprising:

• one or more processing circuits comprising one or more processors and one or more memories storing instructions that, when executed by the one or more processors, cause the one or more processing circuits to execute:
• a persistent store configured to store data and retrieve data;
• and
• a task runner configured to:
• receive an initial input message from a caller computing device;
• identify a workflow associated with the initial input message, the workflow comprising a plurality of activities, each activity being an idempotent read-write activity, an idempotent read-only activity, or a non-idempotent read-only activity associated with a corresponding one of a plurality of services implemented by program instructions stored in the one or more memories and executed by the one or more processors of the one or more processing circuits;
• and
• supply the initial input message to the workflow to execute the workflow as a task,
• the one or more memories further storing instructions that, when executed by the one or more processing circuits, cause the processing system to, for each activity in the workflow:
• determine whether an input message to the activity comprises non-reproducible data;
• in response to determining that an input message to the activity comprises non-reproducible data, store the non-reproducible data in the persistent store only if the input message comprises non-reproducible data and the activity is a read-write activity or a return to the caller;
• and
• provide the input message to a service corresponding to the activity to execute the activity of the workflow.