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49 lines
1.2 KiB
49 lines
1.2 KiB
3 years ago
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import {Collection} from "../collection/Collection";
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import {uuid_v4} from "./data";
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/**
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* Type structure for a single item in the global registry.
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*/
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export type GlobalRegistrant = { key: string | symbol, value: any }
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/**
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* A convenient class to manage global variables.
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*/
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export class GlobalRegistry extends Collection<GlobalRegistrant> {
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constructor() {
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super()
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this.setGlobal('registry_uuid', uuid_v4())
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}
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/**
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* Store the given `value` associated by `key`.
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* @param key
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* @param value
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*/
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public setGlobal(key: string | symbol, value: any): this {
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const existing = this.firstWhere('key', '=', key)
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if ( existing ) {
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existing.value = value
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} else {
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this.push({ key, value })
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}
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return this
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}
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/**
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* Retrieve the value of the given `key`, if it exists in the store.
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* @param key
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*/
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public getGlobal(key: string | symbol): any {
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return this.firstWhere('key', '=', key)?.value
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}
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}
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/**
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* Export a singleton global registry for all code to share.
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*
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* Exporting an instance here guarantees that all code that import it will get the same instance.
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*/
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export const globalRegistry = new GlobalRegistry()
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