106 lines
3.0 KiB
Swift
106 lines
3.0 KiB
Swift
//
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// Copyright (c) 2020 Open Whisper Systems. All rights reserved.
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//
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import Foundation
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import SignalServiceKit
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// This entity has responsibility for blocking the device from sleeping if
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// certain behaviors (e.g. recording or playing voice messages) are in progress.
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//
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// Sleep blocking is keyed using "block objects" whose lifetime corresponds to
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// the duration of the block. For example, sleep blocking during audio playback
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// can be keyed to the audio player. This provides a measure of robustness.
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// On the one hand, we can use weak references to track block objects and stop
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// blocking if the block object is deallocated even if removeBlock() is not
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// called. On the other hand, we will also get correct behavior to addBlock()
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// being called twice with the same block object.
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@objc
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public class DeviceSleepManager: NSObject {
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@objc
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public static let shared = DeviceSleepManager()
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let serialQueue = DispatchQueue(label: "DeviceSleepManager")
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private class SleepBlock: CustomDebugStringConvertible {
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weak var blockObject: NSObject?
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var debugDescription: String {
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return "SleepBlock(\(String(reflecting: blockObject)))"
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}
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init(blockObject: NSObject) {
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self.blockObject = blockObject
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}
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}
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private var blocks: [SleepBlock] = []
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private override init() {
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super.init()
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SwiftSingletons.register(self)
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NotificationCenter.default.addObserver(self,
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selector: #selector(didEnterBackground),
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name: .OWSApplicationDidEnterBackground,
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object: nil)
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}
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deinit {
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NotificationCenter.default.removeObserver(self)
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}
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@objc
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private func didEnterBackground() {
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AssertIsOnMainThread()
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serialQueue.sync {
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ensureSleepBlocking()
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}
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}
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@objc
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public func addBlock(blockObject: NSObject) {
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serialQueue.sync {
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blocks.append(SleepBlock(blockObject: blockObject))
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ensureSleepBlocking()
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}
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}
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@objc
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public func removeBlock(blockObject: NSObject) {
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serialQueue.sync {
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blocks = blocks.filter {
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$0.blockObject != nil && $0.blockObject != blockObject
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}
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ensureSleepBlocking()
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}
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}
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private func ensureSleepBlocking() {
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assertOnQueue(serialQueue)
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// Cull expired blocks.
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blocks = blocks.filter {
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$0.blockObject != nil
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}
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let shouldBlock = blocks.count > 0
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let description: String
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switch blocks.count {
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case 0:
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description = "no blocking objects"
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case 1:
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description = "\(blocks[0])"
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default:
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description = "\(blocks[0]) and \(blocks.count - 1) others"
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}
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DispatchQueue.main.async {
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CurrentAppContext().ensureSleepBlocking(shouldBlock, blockingObjectsDescription: description)
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}
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}
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}
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