mirror of https://github.com/oxen-io/session-ios
Updated the cachedEncodedPublicKey to be Atomic
Added the Atomic wrapper for thread safe variablespull/604/head
Morgan Pretty
3 years ago
parent
f8dfbd4244
commit
1214005c59
@ -0,0 +1,44 @@
|
||||
// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.
|
||||
import Foundation
|
||||
|
||||
// MARK: - Atomic<Value>
|
||||
/// The `Atomic<Value>` wrapper is a generic wrapper providing a thread-safe way to get and set a value
|
||||
///
|
||||
/// A write-up on the need for this class and it's approach can be found here:
|
||||
/// https://www.vadimbulavin.com/swift-atomic-properties-with-property-wrappers/
|
||||
/// there is also another approach which can be taken but it requires separate types for collections and results in
|
||||
/// a somewhat inconsistent interface between different `Atomic` wrappers
|
||||
@propertyWrapper
|
||||
public class Atomic<Value> {
|
||||
private let queue: DispatchQueue = DispatchQueue(label: "io.oxen.\(UUID().uuidString)")
|
||||
private var value: Value
|
||||
|
||||
/// In order to change the value you **must** use the `mutate` function
|
||||
public var wrappedValue: Value {
|
||||
return queue.sync { return value }
|
||||
}
|
||||
|
||||
/// For more information see https://github.com/apple/swift-evolution/blob/master/proposals/0258-property-wrappers.md#projections
|
||||
public var projectedValue: Atomic<Value> {
|
||||
return self
|
||||
}
|
||||
|
||||
// MARK: - Initialization
|
||||
public init(_ initialValue: Value) {
|
||||
self.value = initialValue
|
||||
}
|
||||
|
||||
// MARK: - Functions
|
||||
|
||||
public func mutate(_ mutation: (inout Value) -> Void) {
|
||||
return queue.sync {
|
||||
mutation(&value)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
extension Atomic where Value: CustomDebugStringConvertible {
|
||||
var debugDescription: String {
|
||||
return value.debugDescription
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue