registry.service.ts

import { Injectable, Injector } from '@angular/core';
import { Executioner } from '../model/executioner';
import { ServiceLocator } from '../services/service-locator';
import { MessageTypeEnum } from '../model/message-type.enum';

@Injectable({
    providedIn: 'root'
})
export class RegistryService {
	private static INSTANCE: RegistryService | undefined = null;

	private registry: Map<MessageTypeEnum, Executioner> = new Map();

	private constructor(private _injector: Injector) {
    }

	public static getRegistry(): RegistryService {
		if (!this.INSTANCE) {
			this.INSTANCE = new RegistryService(ServiceLocator.injector);
		}
		return this.INSTANCE;
	}

	register(key: MessageTypeEnum, value: Executioner): void {
		this.registry.set(key, value);
	}

	getRegister(key: MessageTypeEnum): Executioner {
		if (this.registry.has(key))
			return this.registry.get(key);
		throw Error(`No service registered for key ${key}`)
	}
}