Created
July 21, 2019 17:12
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import Foundation | |
import Combine | |
protocol Request { | |
associatedtype Response: Decodable | |
var resource: Data { get } | |
} | |
struct User: Decodable { | |
let name: String | |
} | |
struct UserRequest: Request { | |
typealias Response = User | |
var resource: Data { | |
return """ | |
{ | |
"name": "yutailang0119" | |
} | |
""".data(using: .utf8)! | |
} | |
} | |
// MARK:- Use Combine.Publisher | |
struct RequestPublisher<R: Request>: Publisher { | |
typealias Output = R.Response | |
typealias Failure = Error | |
let request: R | |
func receive<S>(subscriber: S) where S: Subscriber, Failure == S.Failure, Output == S.Input { | |
do { | |
let value = try JSONDecoder().decode(R.Response.self, from: request.resource) | |
subscriber.receive(value) | |
subscriber.receive(completion: .finished) | |
} catch { | |
subscriber.receive(completion: .failure(error)) | |
} | |
} | |
} | |
do { | |
let submitSubject = PassthroughSubject<Void, Error>() | |
let responseSubject = PassthroughSubject<UserRequest.Response, Error>() | |
let request = UserRequest() | |
let publisher = submitSubject | |
.flatMap { | |
RequestPublisher(request: request) | |
.eraseToAnyPublisher() | |
} | |
let publisherStream = publisher | |
.eraseToAnyPublisher() | |
.subscribe(responseSubject) | |
let cancellable = responseSubject.sink(receiveCompletion: { conpletion in | |
switch conpletion { | |
case .finished: | |
print("finished") | |
case .failure(let error): | |
print("failure: \(error)") | |
} | |
}) { user in | |
print(user.name) | |
} | |
submitSubject.send(()) | |
} | |
// MARK:- Use Combine.Future | |
struct RequestFuture<R: Request> { | |
let request: R | |
func makeFuture() -> Future<R.Response, Error> { | |
return Future { promise in | |
do { | |
let value = try JSONDecoder().decode(R.Response.self, from: self.request.resource) | |
promise(.success(value)) | |
} catch { | |
promise(.failure(error)) | |
} | |
} | |
} | |
} | |
do { | |
let submitSubject = PassthroughSubject<UserRequest, Error>() | |
let responseSubject = PassthroughSubject<UserRequest.Response, Error>() | |
let request = UserRequest() | |
let future = submitSubject | |
.map(RequestFuture.init(request:)) | |
.map { $0.makeFuture() } | |
.flatMap { $0.eraseToAnyPublisher() } | |
let futureStream = future | |
.eraseToAnyPublisher() | |
.subscribe(responseSubject) | |
let cancellable = responseSubject.sink(receiveCompletion: { conpletion in | |
switch conpletion { | |
case .finished: | |
print("finished") | |
case .failure(let error): | |
print("failure: \(error)") | |
} | |
}) { user in | |
print(user.name) | |
} | |
submitSubject.send(request) | |
} |
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