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January 26, 2018 15:25
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Execute `APIKit.Session.send(_:callbackQueue:handler:)` synchronously.
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| import APIKit | |
| import Result | |
| extension APIKit.Session { | |
| class func sendSynchronous<Request>(_ request: Request) -> Result<Request.Response, APIKit.SessionTaskError> where Request: APIKit.Request { | |
| return shared.sendSynchronous(request) | |
| } | |
| /// Execute `send(_:callbackQueue:handler:)` synchronously. | |
| /// This method should be called on non-main thread. | |
| func sendSynchronous<Request>(_ request: Request) -> Result<Request.Response, APIKit.SessionTaskError> where Request: APIKit.Request { | |
| guard !Thread.isMainThread else { fatalError("'\(#function)' should be called on non-main thread.") } | |
| var result: Result<Request.Response, SessionTaskError>? = nil | |
| let semaphore = DispatchSemaphore(value: 0) | |
| send(request) { | |
| result = $0 | |
| semaphore.signal() | |
| } | |
| _ = semaphore.wait(timeout: .distantFuture) | |
| return result! | |
| } | |
| } | |
| DispatchQueue(label: "FooBar").async { | |
| let fooResult = Session.sendSynchronous(FooRequest()) | |
| switch result { | |
| case .success(let response): | |
| print(response) | |
| case .failure(let error): | |
| print(error) | |
| } | |
| let barResult = Session.sendSynchronous(BarRequest()) | |
| switch result { | |
| case .success(let response): | |
| print(response) | |
| case .failure(let error): | |
| print(error) | |
| } | |
| } |
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