{"id":"srp-primary-practical-judgment-mechanism","text":"SRP functions as a concrete entry point for principled OO design judgment: its actor-based framing provides specific decision criteria for at least some architectural tradeoffs (resolving decoupling topology choices — distinct actors favor Observer's distributed model, coordinated actors sharing a single purpose favor Mediator's centralized control) while simultaneously serving as a concrete demonstration that SOLID can ground pattern judgment in practice (showing that principled SOLID reasoning with precise semantics yields actionable pattern selections in at least one well-defined case).","truth_value":"IN","source":"","source_url":"","source_hash":"","justifications":[{"type":"SL","antecedents":["srp-resolves-decoupling-topology-choice","srp-validates-solid-as-judgment-framework"],"outlist":[],"label":"SRP's dual role — specific architectural decision mechanism plus general framework validation — establishes it as the primary practical judgment entry point"}],"dependents":["srp-entry-point-for-dimensional-judgment"],"metadata":{"source_type":"derived","review_result":"pass","repair_action":"softened"},"created_at":"2026-06-17T23:16:43+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-primary-practical-judgment-mechanism","truth_value":"IN","reason":"SL justification valid","antecedents":["srp-resolves-decoupling-topology-choice","srp-validates-solid-as-judgment-framework"],"label":"SRP's dual role — specific architectural decision mechanism plus general framework validation — establishes it as the primary practical judgment entry point"},{"node":"srp-resolves-decoupling-topology-choice","truth_value":"IN","reason":"SL justification valid","antecedents":["srp-grounds-observer-mediator-decision","decoupling-topology-composition-based"],"label":"SRP's actor semantics are the selection criterion when all four decoupling topologies are compositionally equivalent"},{"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"},{"node":"decoupling-topology-composition-based","truth_value":"IN","reason":"SL justification valid","antecedents":["four-decoupling-patterns-topology","behavioral-patterns-favor-composition"],"label":"The decoupling topology (depth-1) is enabled by composition preference (depth-1) — topology and mechanism unify"},{"node":"four-decoupling-patterns-topology","truth_value":"IN","reason":"SL justification valid","antecedents":["four-patterns-decouple-senders-receivers","command-decouples-invoker-from-receiver","gof-mediator-replaces-many-to-many-with-one-to-many","chain-of-responsibility-implicit-receiver","gof-observer-intent-one-to-many-dependency"],"label":"Decoupling patterns span a topology from reified request to implicit broadcast"},{"node":"four-patterns-decouple-senders-receivers","truth_value":"IN","reason":"premise"},{"node":"command-decouples-invoker-from-receiver","truth_value":"IN","reason":"premise"},{"node":"gof-mediator-replaces-many-to-many-with-one-to-many","truth_value":"IN","reason":"premise"},{"node":"chain-of-responsibility-implicit-receiver","truth_value":"IN","reason":"premise"},{"node":"gof-observer-intent-one-to-many-dependency","truth_value":"IN","reason":"premise"},{"node":"behavioral-patterns-favor-composition","truth_value":"IN","reason":"SL justification valid","antecedents":["behavioral-patterns-class-vs-object","behavioral-patterns-encapsulate-variation","favor-composition-over-inheritance"],"label":"Behavioral object patterns are composition-over-inheritance put into practice"},{"node":"behavioral-patterns-class-vs-object","truth_value":"IN","reason":"premise"},{"node":"behavioral-patterns-encapsulate-variation","truth_value":"IN","reason":"premise"},{"node":"favor-composition-over-inheritance","truth_value":"IN","reason":"premise"},{"node":"srp-validates-solid-as-judgment-framework","truth_value":"IN","reason":"SL justification valid","antecedents":["srp-grounds-observer-mediator-decision","solid-grounds-pattern-judgment"],"label":"SRP/Observer-Mediator is a concrete instance proving the general SOLID→judgment claim"},{"node":"solid-grounds-pattern-judgment","truth_value":"IN","reason":"SL justification valid","antecedents":["solid-mutual-reinforcement","pattern-judgment-required"],"label":"SOLID gives the vocabulary and criteria for the judgment that the GoF warns is necessary"},{"node":"solid-mutual-reinforcement","truth_value":"IN","reason":"SL justification valid","antecedents":["srp-violation-increases-coupling","ocp-open-for-extension-closed-for-modification","lsp-substitutability-of-subtypes","isp-no-forced-dependency-on-unused-methods","dip-depend-on-abstractions-not-concretions"],"label":"Five SOLID principles form a reinforcing system, not independent rules"},{"node":"srp-violation-increases-coupling","truth_value":"IN","reason":"premise"},{"node":"ocp-open-for-extension-closed-for-modification","truth_value":"IN","reason":"premise"},{"node":"lsp-substitutability-of-subtypes","truth_value":"IN","reason":"premise"},{"node":"isp-no-forced-dependency-on-unused-methods","truth_value":"IN","reason":"premise"},{"node":"dip-depend-on-abstractions-not-concretions","truth_value":"IN","reason":"premise"},{"node":"pattern-judgment-required","truth_value":"IN","reason":"SL justification valid","antecedents":["patterns-should-not-be-applied-indiscriminately","gof-language-choice-affects-pattern-applicability","dip-overgeneralization-pitfall"],"label":"Three independent cautions converge on the need for judgment in pattern application"},{"node":"patterns-should-not-be-applied-indiscriminately","truth_value":"IN","reason":"premise"},{"node":"gof-language-choice-affects-pattern-applicability","truth_value":"IN","reason":"premise"},{"node":"dip-overgeneralization-pitfall","truth_value":"IN","reason":"premise"}]}}