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RUM-5248 feat: setup ContextReceiver which can observe to single prop…
…erty in context message
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51 changes: 51 additions & 0 deletions
51
DatadogCore/Sources/Core/Context/MemoryWarningPublisher.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| /* | ||
| * Unless explicitly stated otherwise all files in this repository are licensed under the Apache License Version 2.0. | ||
| * This product includes software developed at Datadog (https://www.datadoghq.com/). | ||
| * Copyright 2019-Present Datadog, Inc. | ||
| */ | ||
|
|
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| import Foundation | ||
| import DatadogInternal | ||
| import UIKit | ||
|
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| /// Tracks the memory warnings history and publishes it to the subscribers. | ||
| internal final class MemoryWarningPublisher: ContextValuePublisher { | ||
| private let queue: DispatchQueue | ||
| var initialValue: MemoryWarningsHistory | ||
| private var receiver: ContextValueReceiver<MemoryWarningsHistory>? | ||
| private let notificationCenter: NotificationCenter | ||
| private var history: MemoryWarningsHistory | ||
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| private static let defaultQueue = DispatchQueue( | ||
| label: "com.datadoghq.memory-warning-publisher", | ||
| target: .global(qos: .utility) | ||
| ) | ||
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| init( | ||
| notificationCenter: NotificationCenter = .default, | ||
| queue: DispatchQueue = MemoryWarningPublisher.defaultQueue, | ||
| initialValue: MemoryWarningsHistory = .init() | ||
| ) { | ||
| self.notificationCenter = notificationCenter | ||
| self.queue = queue | ||
| self.initialValue = initialValue | ||
| self.history = initialValue | ||
| } | ||
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| func publish(to receiver: @escaping ContextValueReceiver<MemoryWarningsHistory>) { | ||
| queue.async { self.receiver = receiver } | ||
| notificationCenter.addObserver(self, selector: #selector(didReceiveMemoryWarning), name: UIApplication.didReceiveMemoryWarningNotification, object: nil) | ||
| } | ||
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| @objc | ||
| func didReceiveMemoryWarning() { | ||
| queue.async { | ||
| self.history.append(warning: .init()) | ||
| self.receiver?(self.history) | ||
| } | ||
| } | ||
|
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| func cancel() { | ||
| notificationCenter.removeObserver(self) | ||
| } | ||
| } |
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