export abstract class Wrapper<Type> {
  abstract get(): Type;
}

export class SingleWrapper<Type> extends Wrapper<Type> {
  protected instance: Type;
  constructor(instance: Type) {
    super();
    this.instance = instance;
  }
  get(): Type {
    return this.instance;
  }
}

export class ThreadedWrapper<Type> extends Wrapper<Type> {
  protected local: Type;
  protected generator: () => Type;
  constructor(generator: () => Type) {
    super();
    this.generator = generator;
    this.local = generator();
  }
  get(): Type {
    return this.local;
  }
}