{"id":"srp-grounds-observer-mediator-decision","text":"SRP's actor-based framing provides the principled decision criterion for the Observer-Mediator tradeoff: when collaborating objects serve distinct actors requiring independent evolution, Observer's distributed model preserves actor boundaries; when objects serve a single coordinated purpose under one actor, Mediator's centralized control simplifies their interaction.","truth_value":"IN","source":"","source_url":"","source_hash":"","justifications":[{"type":"SL","antecedents":["srp-precise-actor-semantics","observer-mediator-distribution-centralization-tradeoff"],"outlist":[],"label":"SRP's actor semantics directly resolves which communication topology (distributed vs centralized) preserves responsibility boundaries"}],"dependents":["observer-principled-composition-architecture","observer-principled-composition-reliably-applicable","srp-resolves-decoupling-topology-choice","srp-validates-solid-as-judgment-framework"],"metadata":{"source_type":"derived","review_result":"pass"},"created_at":"2026-06-17T18:49:29+00:00","updated_at":"2026-06-18T06:15:08+00:00","reviewed_at":"2026-06-18T06:15:08+00:00","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"srp-grounds-observer-mediator-decision","truth_value":"IN","reason":"SL justification valid","antecedents":["srp-precise-actor-semantics","observer-mediator-distribution-centralization-tradeoff"],"label":"SRP's actor semantics directly resolves which communication topology (distributed vs centralized) preserves responsibility boundaries"},{"node":"srp-precise-actor-semantics","truth_value":"IN","reason":"SL justification valid","antecedents":["srp-actor-based-not-technical","srp-responsibility-means-one-reason-to-change","srp-canonical-definition"],"label":"The actor framing is what transforms SRP from a vague guideline into a precise design constraint; the emergent insight is which component provides the precision"},{"node":"srp-actor-based-not-technical","truth_value":"IN","reason":"premise"},{"node":"srp-responsibility-means-one-reason-to-change","truth_value":"IN","reason":"premise"},{"node":"srp-canonical-definition","truth_value":"IN","reason":"premise"},{"node":"observer-mediator-distribution-centralization-tradeoff","truth_value":"IN","reason":"SL justification valid","antecedents":["mediator-centralizes-observer-distributes","observers-more-reusable-than-mediators","gof-observer-unexpected-updates-liability","gof-mediator-centralizes-control-tradeoff"],"label":"Two base beliefs on the relationship + one liability each combine into a unified architectural tradeoff"},{"node":"mediator-centralizes-observer-distributes","truth_value":"IN","reason":"premise"},{"node":"observers-more-reusable-than-mediators","truth_value":"IN","reason":"premise"},{"node":"gof-observer-unexpected-updates-liability","truth_value":"IN","reason":"premise"},{"node":"gof-mediator-centralizes-control-tradeoff","truth_value":"IN","reason":"premise"}]}}