56 lines
1.8 KiB
TypeScript
56 lines
1.8 KiB
TypeScript
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let instanceMap = new Map();
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export interface PrototypeType<T> extends Function {
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prototype: T;
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}
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export interface ConstructorFunctionType<T = any> extends PrototypeType<T> {
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new(...args: any[]): T;
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}
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export type ConstructorType<T = unknown, Static extends Record<string, any> = PrototypeType<T>> = (ConstructorFunctionType<T> | PrototypeType<T>) & {
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[Key in keyof Static]: Static[Key];
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};
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/**
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* 构造单例类的静态类.
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* # Example:
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* class A extends Singleton(){};
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* //获得单例
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* let a = A.GetInstance();
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*/
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export class Singleton {
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protected constructor() { }
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//ref:https://github.com/Microsoft/TypeScript/issues/5863
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static GetInstance<T extends Singleton>(this: ConstructorType<T, typeof Singleton>): T {
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if (instanceMap.has(this))
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return instanceMap.get(this);
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//@ts-ignore
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let __instance__ = new this.prototype.constructor();
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instanceMap.set(this, __instance__);
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return __instance__;
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}
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/**
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* 释放指定类型的单例实例。
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* @returns {boolean} 如果实例存在并被释放则返回 true，否则返回 false。
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*/
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static ReleaseInstance<T extends Singleton>(this: ConstructorType<T, typeof Singleton>): boolean {
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if (instanceMap.has(this)) {
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const instance = instanceMap.get(this);
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// 如果实例有清理方法，可以在这里调用
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if (typeof (instance as any).dispose === 'function') {
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(instance as any).dispose();
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}
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instanceMap.delete(this);
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console.log(`Singleton instance of ${this.name} has been released.`);
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return true;
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}
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console.log(`No singleton instance of ${this.name} found to release.`);
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return false;
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}
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}
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