DefaultBootstrapContext class final

The default implementation of ConfigurableBootstrapContext in JetLeaf.

This class is responsible for managing instance suppliers, created instances, and event listeners during the bootstrap phase of the application. It provides a thread-safe, singleton-aware mechanism for instance creation, caching, and retrieval.

Responsibilities

1. Instance Supplier Registration

   • Allows registering factories (BootstrapInstanceSupplier) for classes.
   • Supports optional replacement of existing registrations while ensuring that already created instances cannot be overridden.

2. Instance Retrieval

   • Returns instances for registered classes on demand.
   • Supports singleton caching if the supplier’s scope is ScopeType.SINGLETON.
   • Provides optional fallback values (orElse) or suppliers (orSupply) when no registration exists.

3. Event Handling

   • Allows adding listeners for bootstrap context events via ApplicationEventBus.
   • Emits BootstrapContextClosedEvent when the context is closed.

4. Thread-Safety

   • All access to internal maps (_isps, _instances) is synchronized to avoid race conditions during concurrent access.

Usage

final context = DefaultBootstrapContext();
context.register(MyService.classType, BootstrapInstanceSupplier.singleton(() => MyService()));
final service = context.get(MyService.classType);
context.close(applicationContext);