Blog.firstSolidPrinciples

SRP_Good.swift

class UserInformationHandler {

	// MARK: - Properties
	let requester: UserInformationRequesteable
	let parser: UserInformationParseable
	let storer: UserInformationStoreable

	// MARK - Life cycle
	init(requester: UserInformationRequesteable,
		 parser: UserInformationParseable,
		 storer: UserInformationStoreable) {
		self.requester = requester
		self.parser = parser
		self.storer = storer
	}

	func handle() {
		let data = requester.request()
		let user = parser.parse(data: data)
		storer.store(user: user)
	}
}

protocol UserInformationRequesteable {
	func request() -> Data
}

class UserInformationRequester: UserInformationRequesteable {
	func request() -> Data {
	// Interaction with the api
	// Synchronous call for simplicity
	}
}

protocol UserInformationParseable {
	func parse(data: Data)
}

class UserInformationParser: UserInformationParseable {
	func parse(data: Data) {
		// parse data an create a dictionary
	}
}

protocol UserInformationStoreable {
	func store(user: [String: Any])
}

class UserInformationStorer: UserInformationStoreable {
	func store(user: [String: Any]) {
		// store on your local database, the information of the user
	}
}