2018/11/30 に開催された中央線 meetup の資料です。 * Swift 概要 * Java プログラマーがつまずくSwiftの仕様/Swiftの羨ましい仕様 * Swift の Web フレームワーク(特に smoke-framework)の紹介

1. Java
Swift
@mike_neck
2018/11/30 meetup

2. • Java
Swift
•
• Java /
• Web

3. •
• @mike_neck
• L is B Java
• golang
• POSIX Swift
swift-regex

4. •
• Wikipedia
•

5. Swift
macOS

6. Swift
• 2014 iOS/macOS
Apple
• 2015 12
• https://github.com/apple/swift
• 4.2.1
• iOS/macOS Linux(Ubuntu +
Android?)

7. • macOS
• XCode
• XCodeToolchain
• …

8. • Ubuntu(18.04/16.04/14.04)
• shared libraries
• clang 3.8
• libcurl-dev/libicu-dev/libssl-dev/
libdispatch-dev/libxml-dev
• https://swift.org/download/#releases

9. • Docker
• docker library
(ubuntu 16.04 )
• docker pull swift:4.2.1

10. ( )
• IDE
• AppCode / CLion
• JetBrains Objective-C/Swift/C/C++ IDE
• 3 4 IntelliJ Platform (postfix
completion …)
• AppCode .xcodeproj
• CLion Swift Package Manager( )

11. ( )
• Swift Package Manager
• Java Maven/Gradle
Apple (Linux )
• ( / )
•
•

12. Swift Package Manager
#
swift package init —type executable
#
swift package resolve
# XCode/AppCode
swift package generate-xcodeproj
#
swift build
#
swift test

13. ( )

14. Java /
Swift
• extension[ ]
• [ ]
• enum[ ]
• (var)/ (let)/ (struct/enum)/
(class)[ ]

15. extension[ ]
• protocol
protocol Monoid {
static var zero: Self
func mappend(_ other: Self) -> Self
}
extension String: Monoid {
static var zero: String { return “” }
func mappend(_ other: String) -> String { return self + other }
}

16. [ ]
•
// Monoid
extension Array where Element: Monoid {
func reduce() -> Element {
self.reduce(Element.zero) {(elem: Element, value: Element) in
return value.mappend(elem)
}
}
}
[“foo”,”bar”,”baz”].reduce() // -> foobarbaz

17. enum[ ]
• Java
• Java
/
• Java

18. enum
enum Answer {
case yes // /
case no
}
enum Either<L, R> { //
case left(value: L) //
case right(value: R)
func map<T>(_ f: (R) -> T) -> Either<L, T> {
switch self {
case .left(let v): return .left(v)
case .right(let v): return .right(f(v))
}
}
}

19. / [ ]
• (var) (let)
•
var int = 10
int = 20 //
let value = 10
value = 20 //

20. / [ ]
• (struct/enum)
• (class)
struct User { //
let id: Int
var name: String
}
class Handler { //
var done: EventLoopPromise<Void>
}

21. / [ ]
• var
( )
struct User { //
let id: Int
var name: String
}
var user = User(id: 20, name: “ ”)
user.name = “ ” // OK
let user = User(id: 100, name: “ ”)
user.name = “ ” // NG

22. Web

23. Kitura
• http://www.kitura.io/
• IBM
•
• /ORM/Logger/template
/Security

24. Vapor
• https://vapor.codes/
•
•
• /ORM/Security

25. Smoke Framework
• https://github.com/amzn/smoke-framework
• Amazon
• smoke
• smoke-aws(Swift aws client)
• smoke-http(HTTP Client)
• smoke-aws-credentials( aws credential
FW)
• smoke-dynamoDB (dynamoDB )

26. Smoke Framework
•
•
•
•

27. func handler(msg: Message, ctx: MyContext) throws -> Message {
print(“receive message: (msg)”)
return msg
}

28. typealias Selector =
StandardSmokeHTTP1HandlerSelector<
MyContext,JSONPayloadHTTP1OpetaionDelegate>
var selector = Selector()
selector.addHandlerForUri(
“/app”,
httpMethod: .POST,
operation: handler,
allowedErrors: [(MyError.err, 400)],
operationDelegate: nil)

29. do {
try SmokeHTTP1Server.startAsOperationServer(
withHandlerSelector: selector,
andContext: MyContext(),
defaultOperationDelegate:
JSONPayloadHTTP1OperationDelegate())
} catch {
print(“failed to start server: (error)”)
}

30. Works fine!!
curl -i http://localhost:8080/app -d ‘{“text”:”test”}’
HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: 22
{
"text" : "test"
}

31. Swift Advent Calendar 2018
https://mike-
neck.hatenadiary.com/entry/
smoke-framework

32. Swift