Errors and Firing Modes

Exceptions

• StatelessError: base exception type
• InvalidTransitionError: invalid trigger path or guard failure
• ConfigurationError: invalid configuration setup

Typical Error Scenarios

• firing an unconfigured trigger without unhandled trigger handler
• guard conditions not met
• calling fire(...) when async behavior is required
• invalid hierarchy setup (for example invalid initial transition target)

FiringMode

from stateless import FiringMode

FiringMode.IMMEDIATE
FiringMode.QUEUED

• IMMEDIATE: process trigger immediately
• QUEUED: queue triggers and process sequentially in async context