43 lines
1.6 KiB
Swift
43 lines
1.6 KiB
Swift
//
|
|
// Copyright 2021 New Vector Ltd
|
|
//
|
|
// 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 Combine
|
|
|
|
extension Publisher {
|
|
|
|
///
|
|
/// Buffer upstream items and guarantee a time interval spacing out the published items.
|
|
/// - Parameters:
|
|
/// - spacingDelay: A delay in seconds to guarantee between emissions
|
|
/// - scheduler: The `DispatchQueue` on which to schedule emissions.
|
|
/// - Returns: The new wrapped publisher
|
|
func bufferAndSpace(spacingDelay: Int, scheduler: DispatchQueue = DispatchQueue.main) -> Publishers.FlatMap<
|
|
Publishers.SetFailureType<Publishers.Delay<Just<Publishers.Buffer<Self>.Output>, DispatchQueue>, Publishers.Buffer<Self>.Failure>,
|
|
Publishers.Buffer<Self>
|
|
> {
|
|
return buffer(size: .max, prefetch: .byRequest, whenFull: .dropNewest)
|
|
.flatMap(maxPublishers: .max(1)) {
|
|
Just($0).delay(for: .seconds(spacingDelay), scheduler: scheduler)
|
|
}
|
|
}
|
|
|
|
func eraseOutput() -> AnyPublisher<Void, Failure> {
|
|
self
|
|
.map { _ in () }
|
|
.eraseToAnyPublisher()
|
|
}
|
|
}
|