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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2020-2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import class Foundation.NSLock
/// Thread-safe array like structure
public final class ThreadSafeArrayStore<Value> {
private var underlying: [Value]
private let lock = NSLock()
public init(_ seed: [Value] = []) {
self.underlying = seed
}
public subscript(index: Int) -> Value? {
self.lock.withLock {
self.underlying[index]
}
}
public func get() -> [Value] {
self.lock.withLock {
self.underlying
}
}
@discardableResult
public func clear() -> [Value] {
self.lock.withLock {
let underlying = self.underlying
self.underlying.removeAll()
return underlying
}
}
@discardableResult
public func append(_ item: Value) -> Int {
self.lock.withLock {
self.underlying.append(item)
return self.underlying.count
}
}
@discardableResult
public func append(contentsOf items: [Value]) -> Int {
self.lock.withLock {
self.underlying.append(contentsOf: items)
return self.underlying.count
}
}
public var count: Int {
self.lock.withLock {
self.underlying.count
}
}
public var isEmpty: Bool {
self.lock.withLock {
self.underlying.isEmpty
}
}
public func map<NewValue>(_ transform: (Value) -> NewValue) -> [NewValue] {
self.lock.withLock {
self.underlying.map(transform)
}
}
public func compactMap<NewValue>(_ transform: (Value) throws -> NewValue?) rethrows -> [NewValue] {
try self.lock.withLock {
try self.underlying.compactMap(transform)
}
}
}
extension ThreadSafeArrayStore: @unchecked Sendable where Value: Sendable {}
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