provide singletons #46
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spion
reviewed
Jun 22, 2019
| if (this.isSingletonProvided(Klass)) { | ||
| throw new Error(`The singleton ${Klass.name} is already provided.`); | ||
| } | ||
| this.providedSingletons.set(Klass, true); |
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can we refactor so the same map is used for provides and overrides?
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on second thought maybe not, you might want to override before providing.
spion
reviewed
Jun 22, 2019
| @@ -115,6 +153,12 @@ export class App { | |||
| if (this.hasSingleton(Klass)) { | |||
| return this.getExistingSingleton(Klass); | |||
| } | |||
| if (!this.isSingletonProvided(Klass)) { | |||
spion
reviewed
Jun 22, 2019
| */ | ||
| load<T>(Klass: ConstructorOrFactory<App, T>): void { | ||
| this.getSingleton(Klass); // force initialization; | ||
| return; | ||
| if (this.isSingletonProvided(Klass)) { |
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In this case it should be just getSingleton (multiple loads should be ok)
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I think we need to re-do this with a bit of thinking.
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Redo this PR or the loading-once-or-twice mechanics? Fine with both really.
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We need to think whether we want to allow loading plugins within plugins, because thats what implies multiple load calls are OK.
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Introduces the concept of "providing singletons".
Modules will be expected to provide stuff to other modules, and doing
app#getSingletonwill throw if stuff wasn't previously provided.Still WIP.