extract-service

To extract duplicated service layer logic, identify repeated operational mechanics across callers, design a data-driven interface for the shared how, and migrate callers individually with verification and rollback procedures.

Refactoring duplicated API mechanics involves moving the shared how into a service function while preserving orchestration logic in callers, then executing a per-caller migration plan with built-in verification and rollback steps.

A plan-driven service extraction migration works by designing an explicit service interface from a scan, then migrating each caller one by one with verification to ensure observable behavior remains identical after each step.

Yes, you can preserve caller orchestration logic by leaving the why and when in the callers. The extracted shared service handles only the how, capturing repeated operational mechanics without altering caller behavior.

To verify observable behavior remains identical during a service layer refactor, specify verification steps and rollback procedures for each migrated caller, ensuring the extracted service function preserves the original mechanics.

You should not use shared service extraction when the duplicated logic represents caller-specific orchestration rather than operational mechanics. Extraction targets the shared how; the callers must retain their unique why and when logic.