{"id":"gof-observer-push-vs-pull-models","text":"The Observer pattern supports two notification models: Push (subject sends detailed change info, making observers less reusable) and Pull (subject sends minimal notification, observers query for details — less efficient but more decoupled).","truth_value":"IN","source":"entries/2026/06/17/gof-oo-chunk-19.md","source_url":"","source_hash":"","justifications":[],"dependents":["data-flow-tension-isomorphic-across-notification-and-delegation","observer-notification-three-design-decisions","push-pull-coupling-tradeoff-recurs-across-patterns"],"metadata":{"last_premise_reviewed":"2026-06-17T18:19:22","premise_review_result":"pass"},"created_at":"2026-06-17T21:30:27+00:00","updated_at":"2026-06-17T21:30:27+00:00","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"gof-observer-push-vs-pull-models","truth_value":"IN","reason":"premise"}]}}