Dependency Injection
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	lyv
	Jun 3 2022, 2:31 PM

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Dependency Injection
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	const Injector = new class
	{
	constructor()
	{
	this.services = new WeakMap();

	this.objectCache = new WeakMap();
	}

	registerService(___)
	{
	let TService = arguments[0];
	let TServiceArgs = [];
	if (arguments.length > 1)
	{
	for (let i = 1; i < arguments.length; ++i)
	{
	TServiceArgs.push(arguments[i]);
	}
	}

	let args = [null].concat(TServiceArgs);
	let instance = new (Function.prototype.bind.apply(TService, args));

	this.services.set(TService, instance);
	}

	getService(TService)
	{
	if (this.services.has(TService))
	{
	return this.services.get(TService);
	}
	else
	{
	error("No service of " + TService.name + " is registered");
	}
	}

	get(___)
	{
	let TObject = arguments[0];
	let TObjectArgs = [];
	if (arguments.length > 1)
	{
	for (let i = 1; i < arguments.length; ++i)
	{
	TObjectArgs.push(arguments[i]);
	}
	}

	if (!TObject.deps)
	{
	error("The class " + TObject.name + " does not define any dependencies");
	}

	let services = [];
	if (!this.objectCache.has(TObject))
	{
	for (let dep of TObject.deps)
	{
	if (this.services.has(dep))
	{
	services.push(this.services.get(dep));
	}
	else
	{
	error("Can't resolve dependency " + dep.name + " for " + TObject.name);
	}
	}

	this.objectCache.set(TObject, services);
	}
	else
	{
	services = this.objectCache.get(TObject);
	}

	let args = [null].concat(services).concat(TObjectArgs);
	let instance = new (Function.prototype.bind.apply(TObject, args));
	return instance;
	}
	};