Type Erasure Protocol

TEParserProtocol.swift

enum Result<T, E: Error> {
    case success(T)
    case failure(E)
}

enum NetworkError: Error {
    case invalidJson
    case badRequest
    case timeout
}

protocol JsonDeserializer {
    associatedtype Response
    func parse(json: [String: Any]) -> Response
}

protocol NetworkSession {
    associatedtype Payload
    func get(url: URL, parameters: [String: String], onComplete: (Result<Payload, NetworkError>) -> Void)
}

class Session<P>: NetworkSession {
    typealias Payload = P
    let deserializer: JsonDeserializer

    init(deserializer: JsonDeserializer) {
        self.deserializer = deserializer
    }

    func get(url: URL, parameters: [String: String], onComplete: (Result<P, NetworkError>) -> Void) {}
}