singleton_manager 2.2.2

High-performance singleton manager for Dart with DI annotations and lazy loading.

example/README.md

Singleton Manager Examples

Three focused examples showing how to use the singleton_manager package.

1. Basic registry (1_basic_registry.dart)

• RegistryManager.instance — the shared registry
• connectInstance<InterfaceType, InstanceType>(factory) — connect an interface to a concrete factory, invoked lazily on first access
• getInstance<T>() — resolve (and cache) the connected instance; throws RegistryNotFoundError if nothing is connected
• getInstanceNullable<T>() — same, but returns null instead of throwing

2. Dependency injection factory (2_dependency_injection_factory.dart)

Shows the @dependencyInjectable annotation and the dependencyInjectionFactory() factory constructor the generator produces for an annotated class, resolving mandatory constructor parameters via getInstance and nullable named parameters via getInstanceNullable.

3. Subkey-disambiguated dependency injection (3_subkey_dependency_injection.dart)

Shows the @Subkey('...') annotation, used to resolve dependency injection ambiguity when multiple constructor parameters share the same interface type. Each parameter is tagged with the subkey it must be resolved with (e.g. ipv4/ipv6), and connectInstance/getInstanceNullable are called with the matching subkey to keep the two registrations independent.

Running the examples

cd packages/singleton_manager
dart run example/1_basic_registry.dart
dart run example/2_dependency_injection_factory.dart
dart run example/3_subkey_dependency_injection.dart