Part of Futura tools Project.
Provides promise implementation for iOS, macOS and Linux.
Use via Swift Package Manager
.package(url: "https://github.com/kaqu/FuturaAsync.git", from: "0.9.0"),Sample usage
let promise = Promise<Int>()
let future = promise.future
future
.thenSuccess {
print("Success: \($0)")
}
.thenFailure {
print("Error: \($0)")
}
.mapValue {
return String($0)
}
.thenSuccess {
print("Success(mapped): \($0)")
}
.thenFailure {
print("Error(mapped): \($0)")
}
.recoverable { err in
if (err as? String) == "recoverable" {
return "Recovery!"
} else {
throw err
}
}
.thenSuccess {
print("Success(mapped, recoverable): \($0)")
}
.thenFailure {
print("Error(mapped, recoverable): \($0)")
}
.map {
switch $0 {
case let .value(val):
return val
case .error:
return "Errors sometimes happen"
}
}
.then { (val: String) in
print("Always success(mapped, recoverable, map to Future form FailableFuture): \(val)")
}calling
promise.fulfill(with: 9)prints
Success: 9
Success(mapped): 9
Success(mapped, recoverable): 9
Always success(mapped, recoverable, map to Future form FailableFuture): 9
calling
promise.break() // cancelprints
Error: cancelled
Error(mapped): cancelled
Error(mapped, recoverable): cancelled
Always success(mapped, recoverable, map to Future form FailableFuture): Errors sometimes happen
calling
promise.break(with: "recoverable" as Error)prints
Error: recoverable
Error(mapped): recoverable
Success(mapped, recoverable): Recovery!
Always success(mapped, recoverable, map to Future form FailableFuture): Recovery!