Apex Design Patterns and Enterprise Architecture

Apex ProgrammingApex Design Patterns and Enterprise ArchitectureStructure large Apex code bases with separation of concerns: Service, Domain, Selector and Unit of Work layers, dependency injection, classic GoF patterns adapted to governor limits, metadata-driven triggers, logging, configuration, feature flags and modular packaging.Advanced · about 80 minutesWhat you will learn

Apply separation of concerns with Service, Domain, Selector and Unit of Work layers

Implement each enterprise pattern by hand and recognize the fflib-apex-common equivalents

Use dependency injection with Type.forName, custom metadata bindings and mocks

Adapt Strategy, Factory, Singleton and Builder patterns to Apex's transaction model and limits

Evaluate metadata-driven trigger frameworks and logging frameworks

Drive behavior with custom metadata and feature flags based on custom permissions

Plan a modular architecture with unlocked packages and avoid common anti-patterns

Contents

Separation of concerns

The Selector layer

The Domain layer

The Unit of Work

The Service layer

fflib-apex-common and fflib-apex-mocks

Dependency injection

Classic patterns adapted to Apex

Metadata-driven trigger frameworks

Error handling and logging frameworks

Custom metadata–driven configuration

Feature flags with custom permissions

Modular architecture with packages

Anti-patterns

Best practices

Common pitfalls

Hands-on exercises

Key takeaways