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Add Atomic Dictionary generic capabilities
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| // Atomic.swift | ||
| // Copyright (c) 2021 FastlaneTools | ||
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| import Foundation | ||
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| protocol DictionaryProtocol: class { | ||
| associatedtype Key: Hashable | ||
| associatedtype Value | ||
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| init() | ||
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| subscript(_: Key) -> Value? { get set } | ||
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| @discardableResult | ||
| func removeValue(forKey key: Key) -> Value? | ||
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| func get(_ key: Key) -> Value? | ||
| func set(_ key: Key, value: Value?) | ||
| } | ||
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| extension DictionaryProtocol { | ||
| subscript(_ key: Key) -> Value? { | ||
| get { | ||
| get(key) | ||
| } | ||
| set { | ||
| set(key, value: newValue) | ||
| } | ||
| } | ||
| } | ||
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| protocol SyncProtocol: DictionaryProtocol { | ||
| func lock() | ||
| func unlock() | ||
| func sync<T>(_ work: () throws -> T) rethrows -> T | ||
| } | ||
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| extension SyncProtocol { | ||
| func sync<T>(_ work: () throws -> T) rethrows -> T { | ||
| lock() | ||
| defer { unlock() } | ||
| return try work() | ||
| } | ||
| } | ||
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| protocol LockProtocol: SyncProtocol { | ||
| associatedtype Lock | ||
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| var _lock: Lock { get set } | ||
| } | ||
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| @available(macOS, introduced: 10.12) | ||
| extension LockProtocol where Lock == UnsafeMutablePointer<os_unfair_lock> { | ||
| func lock() { | ||
| os_unfair_lock_lock(_lock) | ||
| } | ||
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| func unlock() { | ||
| os_unfair_lock_unlock(_lock) | ||
| } | ||
| } | ||
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| @available(macOS, deprecated: 10.12) | ||
| extension LockProtocol where Lock == OSSpinLock { | ||
| func lock() { | ||
| OSSpinLockLock(&_lock) | ||
| } | ||
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| func unlock() { | ||
| OSSpinLockUnlock(&_lock) | ||
| } | ||
| } | ||
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| protocol AnyLock {} | ||
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| @available(macOS, deprecated: 10.12) | ||
| extension OSSpinLock: AnyLock { | ||
| static func make() -> Self { | ||
| OS_SPINLOCK_INIT | ||
| } | ||
| } | ||
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| @available(macOS, introduced: 10.12) | ||
| extension UnsafeMutablePointer: AnyLock where Pointee == os_unfair_lock { | ||
| static func make() -> Self { | ||
| let unfairLock = UnsafeMutablePointer<os_unfair_lock>.allocate(capacity: 1) | ||
| unfairLock.initialize(to: os_unfair_lock()) | ||
| return unfairLock | ||
| } | ||
| } | ||
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| // MARK: - Classes | ||
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| class AtomicDictionary<Key: Hashable, Value>: LockProtocol { | ||
| typealias Lock = AnyLock | ||
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| var _lock: Lock = { | ||
| if #available(macOS 10.12, *) { | ||
| return UnsafeMutablePointer<os_unfair_lock>.make() | ||
| } else { | ||
| return OSSpinLock.make() | ||
| } | ||
| }() | ||
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| private var storage: [Key: Value] = [:] | ||
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| required init() {} | ||
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| @discardableResult | ||
| func removeValue(forKey key: Key) -> Value? { | ||
| sync { | ||
| storage.removeValue(forKey: key) | ||
| } | ||
| } | ||
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| func get(_ key: Key) -> Value? { | ||
| sync { | ||
| storage[key] | ||
| } | ||
| } | ||
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| func set(_ key: Key, value: Value?) { | ||
| sync { | ||
| storage[key] = value | ||
| } | ||
| } | ||
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| func lock() {} | ||
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| func unlock() {} | ||
| } | ||
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| @available(macOS, deprecated: 10.12) | ||
| class OSSPinAtomicDictionary<Key: Hashable, Value>: AtomicDictionary<Key, Value> { | ||
| override func lock() {} | ||
| override func unlock() {} | ||
| } | ||
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| @available(macOS, introduced: 10.12) | ||
| class UnfairAtomicDictionary<Key: Hashable, Value>: AtomicDictionary<Key, Value> { | ||
| override func lock() {} | ||
| override func unlock() {} | ||
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| deinit { | ||
| (_lock as? UnsafeMutablePointer<os_unfair_lock>)?.deallocate() | ||
| } | ||
| } |
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