Production-grade, type-safe query abstraction drawn directly from how our senior engineers build data access layers on real client work. One interface pattern. Every query your domain needs – and a migration path if you're already sitting on hundreds of repository methods.
The Criteria<T> interface, its generic type constraints, and how the predicate composition model works. Including the reasoning behind keeping it infrastructure-agnostic – the decision that makes every other part of the pattern worth having.
AND, OR, and NOT compositions – including nested grouping, short-circuit evaluation, and how to handle cross-aggregate queries without the domain logic bleeding into your data access layer.
Concrete implementations across JPA, Hibernate, Entity Framework, and raw JDBC. Adapter patterns for each. Plus a step-by-step migration guide for codebases already carrying 140+ repository methods.
| Metric | Without Criteria | With Criteria | Improvement |
|---|---|---|---|
| Methods per aggregate | ~140 | 2–3 (same pattern) | 98% reduction |
| Total methods (20 aggregates) | ~2,800 unique signatures | 40–60 (same 3 repeated) | 98% reduction |
| Development time | 1,860 hours | 26 hours | 94% faster |
| Maintenance cost | 1,167 hours | 25 hours | 98% lower |
| Learning curve | 2,800 unique method names | 1 interface pattern | Cognitive load eliminated |
| Type safety | Partial, error-prone | End-to-end, compile-time | Runtime errors prevented |
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