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 |
Fill in the form and we'll send you the PDF directly.
If it raises questions about your own data access layer, our engineers are easy to find. Direct conversation. No pitch.
