Future - 基于微框架设计思想的异步执行及结果响应类

Future - 基于微框架设计思想的异步执行及结果响应类

Future

Swift µframework providing Future.

This library is inspired by the talk of Javier Soto at SwiftSubmit2015 and the Future implementation in Scala.

And this is using antitypical/Result.

Why we need Future?

Traditional async code

func requestRepository(repoId: Int64, completion: (Repository?, NSError?) -> Void) {} func requestUser(userId: Int64, completion: (User?, NSError?) -> Void) {} // get owner info of a given repository requestRepository(12345) { repo, error in if let repo = repo { requestUser(repo.ownerId) { user, error in if let user = user { // do something } else { // error handling } } } else { // error handling } }

Code with Future

let future = requestRepository(12345) .map { $0.ownerId } .flatMap(requestUser)future.onCompleted { result in switch result { case .Success(let user): println(user) case .Failure(let error): println(error) }}

Shorthand by using operator

let future = requestRepository(12345) <^> { $0.ownerId } >>- requestUserfuture.onCompleted { result in switch result { case .Success(let user): println(user) case .Failure(let error): println(error) }}

Usage

map <^>

let f = requestUser("nghialv") <^> { $0.id }f.onSuccess { userId in println(userId)}

flatMap >>-

let f = searchRepositories("Hakuba") <^> { $0.first!.ownerName } >>- requestUserf.onComplete { result in switch result { case .Success(let user): println(user) case .Failure(let error): println(error) }}

filter

let e = NSError(domain: "noSuchElement", code: 1, userInfo: nil)let f1 = searchRepositories("Hakuba")let f = f1.filter(e){ $0.count > 0 } <^> { $0.first!.ownerName } >>- requestUserf.onComplete { result in switch result { case .Success(let user): println(user) case .Failure(let error): println(error) }}

andThen

// side-effectvar reposCount = 0 let f1 = searchRepositories("Hakuba")let f2 = f1.andThen { result in switch result { case .Success(let repos): reposCount = repos.value.count case .Failure(let error): break }}let f3 = f2 <^> { $0.first!.ownerName } >>- requestUser f3.onComplete { result in switch result { case .Success(let user): println(user) case .Failure(let error): println(error) }}

recover zip

let f1 = searchRepositories("Future")let f2 = requestUser("nghialv") let f3 = f1.zip(f2)f3.onSuccess { repos, user in println(repos) println(user)}

flatten

Installation

Using Carthage

Insert github "nghialv/Future" to your CartfileRun carthage update

Using Cocoapods

Insert use_frameworks! to your PodfileInsert pod "Future" to your PodfileRun pod install

Using Submodule

Requirements

Swift 1.2 (Xcode 6.3 or later)iOS 8.0 or later

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