feat(behavioral): Add fallback mechanism to Chain of Responsibility pattern#473
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SanjanaG-01 wants to merge 5 commits intofaif:masterfrom
Open
feat(behavioral): Add fallback mechanism to Chain of Responsibility pattern#473SanjanaG-01 wants to merge 5 commits intofaif:masterfrom
SanjanaG-01 wants to merge 5 commits intofaif:masterfrom
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- Handler.handle() refactored as a Template Method returning bool - Added handle_fallback() hook to Handler base class; fires automatically when the chain exhausts with no handler — requests never silently dropped - FallbackHandler redesigned with mode='log'|'strict' for dev vs production - Added tests/behavioral/test_chain_of_responsibility.py (16 tests, full coverage) - Updated module docstring with real-world support escalation analogy - Updated .gitignore to exclude docs/superpowers/ and .claude/
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Summary
Handler.handle()as a Template Method returningbool— callers can now detect whether a request was processedhandle_fallback()hook toHandlerbase class; fires automatically when the chain exhausts with no handler — requests are never silently droppedFallbackHandlerwith configurablemode='log'|'strict'for dev vs production usetests/behavioral/test_chain_of_responsibility.pywith 16 tests covering all paths (routing, fallback, strict mode, graceful exhaustion).gitignoreto exclude tool-generated directoriesWhy this matters
The original implementation silently dropped unhandled requests with no feedback. This change composes the Template Method pattern inside the Chain of Responsibility, making the fallback automatic and explicit.
Test plan
pytest tests/behavioral/test_chain_of_responsibility.py -v— all 16 passpython -m doctest patterns/behavioral/chain_of_responsibility.py— all 12 doctest items pass