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38 lines
1.5 KiB
Swift
38 lines
1.5 KiB
Swift
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//
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// Copyright 2021 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import Combine
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@available(iOS 14.0, *)
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extension Publisher {
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///
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/// Buffer upstream items and guarantee a time interval spacing out the published items.
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/// - Parameters:
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/// - spacingDelay: A delay in seconds to guarantee between emissions
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/// - scheduler: The `DispatchQueue` on which to schedule emissions.
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/// - Returns: The new wrapped publisher
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func bufferAndSpace(spacingDelay: Int, scheduler: DispatchQueue = DispatchQueue.main) -> Publishers.FlatMap<
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Publishers.SetFailureType<Publishers.Delay<Just<Publishers.Buffer<Self>.Output>, DispatchQueue>, Publishers.Buffer<Self>.Failure>,
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Publishers.Buffer<Self>
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> {
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return buffer(size: .max, prefetch: .byRequest, whenFull: .dropNewest)
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.flatMap(maxPublishers: .max(1)) {
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Just($0).delay(for: .seconds(spacingDelay), scheduler: scheduler)
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}
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}
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}
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