32 lines
1.3 KiB
Swift
32 lines
1.3 KiB
Swift
// Copyright 2018 Google Inc. All rights reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at:
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
import Dispatch
|
|
|
|
public extension Promise {
|
|
|
|
/// Provides a way to always execute a given chained block.
|
|
/// - parameters:
|
|
/// - queue: A queue to dispatch on.
|
|
/// - work: A block that always executes, no matter if `self` is rejected or fulfilled.
|
|
/// - returns: A new pending promise to be resolved with same resolution as `self`.
|
|
@discardableResult
|
|
func always(on queue: DispatchQueue = .promises, _ work: @escaping () -> Void) -> Promise {
|
|
let promise = Promise(objCPromise.__onQueue(queue, always: work))
|
|
// Keep Swift wrapper alive for chained promise until `ObjCPromise` counterpart is resolved.
|
|
objCPromise.__addPendingObject(promise)
|
|
return promise
|
|
}
|
|
}
|