DescriptorImpl.ts
66 lines
| 2.0 KiB
| video/mp2t
|
TypeScriptLexer
cin
|
r0 | import { Descriptor, PartialServiceMap, ILifetime, ContainerKeys } from "../interfaces"; | ||
| import { ActivationContext } from "../ActivationContext"; | ||||
| import { each } from "../../safe"; | ||||
| import { DependencyOptions, LazyDependencyOptions, Resolver } from "./interfaces"; | ||||
| export interface DescriptorImplArgs<S extends object, T> { | ||||
| lifetime: ILifetime; | ||||
| factory: (resolve: Resolver<S>) => T; | ||||
| cleanup?: (item: T) => void; | ||||
| overrides?: PartialServiceMap<S>; | ||||
| } | ||||
| export class DescriptorImpl<S extends object, T> implements Descriptor<S, T> { | ||||
| private readonly _overrides?: PartialServiceMap<S>; | ||||
| private readonly _lifetime: ILifetime; | ||||
| private readonly _factory: (resolve: Resolver<S>) => T; | ||||
| private readonly _cleanup?: (item: T) => void; | ||||
| constructor(args: DescriptorImplArgs<S, T>) { | ||||
| this._lifetime = args.lifetime; | ||||
| this._factory = args.factory; | ||||
| if (args.cleanup) | ||||
| this._cleanup = args.cleanup; | ||||
| if (args.overrides) | ||||
| this._overrides = args.overrides; | ||||
| } | ||||
| activate(context: ActivationContext<S>): T { | ||||
| if (this._lifetime.has()) | ||||
| return this._lifetime.get(); | ||||
| this._lifetime.initialize(context); | ||||
| if (this._overrides) | ||||
| each(this._overrides, (v, k) => context.register(k, v)); | ||||
| const resolve = (name: ContainerKeys<S>, opts?: DependencyOptions | LazyDependencyOptions) => { | ||||
| if (opts && "lazy" in opts && opts.lazy) { | ||||
| const c2 = context.clone(); | ||||
| return () => { | ||||
| return opts.optional ? c2.resolve(name, opts.default) : c2.resolve(name); | ||||
| }; | ||||
| } else { | ||||
| return opts && opts.optional ? context.resolve(name, opts.default) : context.resolve(name); | ||||
| } | ||||
| }; | ||||
| const instance = this._factory.call(undefined, resolve); | ||||
| this._lifetime.store(instance, this._cleanup); | ||||
| return instance; | ||||
| } | ||||
| toString() { | ||||
| return `[object DescriptorImpl, lifetime=${this._lifetime}]`; | ||||
| } | ||||
| } | ||||