2024-08-03 - Updated to Swift 6 concurrency

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 5.8
+// swift-tools-version: 5.10
 
 import PackageDescription
 
@@ -20,7 +20,10 @@ let package = Package(
         .target(
             name: "ZodiacKit",
             dependencies: [],
-			path: "Sources"
+			path: "Sources",
+            swiftSettings: [
+                .enableExperimentalFeature("StrictConcurrency")
+            ]
 		),
         .testTarget(
             name: "ZodiacKitTests",

Sources/ZodiacKit/Defaults/DefaultZodiacs.swift

@@ -8,6 +8,7 @@ import Foundation
 
 /// Contains the default set of Western Zodiac signs and their associated date ranges.
 /// These defaults are used by `ZodiacService` if no custom zodiacs are provided.
+@ZodiacActor
 public let defaultZodiacs: [WesternZodiac] = [
 	WesternZodiac(
 		sign: .aquarius,

Sources/ZodiacKit/Helper/ZodiacActor.swift

@@ -0,0 +1,39 @@
+//
+// Project: 
+// Author: Mark Battistella
+// Website: https://markbattistella.com
+//
+
+import Foundation
+
+/// A global actor to manage concurrency for shared resources.
+///
+/// The `GlobalActor` is used to ensure that certain shared resources are accessed
+/// in a thread-safe manner. By isolating code to this actor, we prevent data races
+/// and ensure safe access to globally accessible variables.
+///
+/// Usage:
+/// ```swift
+/// @ZodiacActor
+/// public var sharedResource: SomeType = ...
+///
+/// @ZodiacActor
+/// public func performThreadSafeOperation() {
+///     // Code that interacts with sharedResource
+/// }
+/// ```
+///
+/// You can also use `await` to call functions isolated to this actor:
+/// ```swift
+/// await GlobalActor.run {
+///     performThreadSafeOperation()
+/// }
+/// ```
+///
+/// - Note: Make sure to use the `@ZodiacActor` attribute to isolate global variables or functions.
+@globalActor
+public actor ZodiacActor {
+
+    /// The shared instance of the global actor.
+    public static let shared = ZodiacActor()
+}

Sources/ZodiacKit/Model/WesternZodiac.swift

@@ -7,7 +7,7 @@
 import Foundation
 
 /// Represents a zodiac sign with its date range
-public struct WesternZodiac: Codable {
+public struct WesternZodiac: Codable, Sendable {
 
 	/// The zodiac sign
 	public let sign: WesternZodiacSign
@@ -19,7 +19,7 @@ public struct WesternZodiac: Codable {
 	public let endDate: DateRange
 
 	/// Represents a date with day and month only
-	public struct DateRange: Codable {
+	public struct DateRange: Codable, Sendable{
 
 		/// The day of the date range
 		public let day: Int

Sources/ZodiacKit/Model/WesternZodiacSign.swift

@@ -13,7 +13,7 @@ public typealias Colour = NSColor
 #endif
 
 /// Represents Western zodiac signs
-public enum WesternZodiacSign: String, ZodiacSign {
+public enum WesternZodiacSign: String, ZodiacSign, Sendable {
 
     /// Available list of Western zodiac signs
     case aquarius, aries, cancer, capricorn, gemini, leo, libra,

Sources/ZodiacKit/Services/ZodiacService.swift

@@ -7,6 +7,7 @@
 import Foundation
 
 /// A service for determining a person's Western and Chinese zodiac signs based on their birthdate.
+@ZodiacActor
 public struct ZodiacService {
 
     /// A collection of WesternZodiac objects representing the zodiac signs.
@@ -26,12 +27,12 @@ public struct ZodiacService {
     /// - Parameter zodiacs: An array of WesternZodiac objects. If not provided, 
     /// a default set is used.
     /// - Throws: An error if the provided zodiacs are invalid.
-    public init(zodiacs: [WesternZodiac] = defaultZodiacs) throws {
-        try validator.validate(zodiacs: zodiacs)
-        self.zodiacs = zodiacs
-        self.dayOfYearToZodiac = ZodiacService.mapZodiacsToDaysOfYear(zodiacs: zodiacs, 
-                                                                      validator: validator)
-    }
+        public init(zodiacs: [WesternZodiac] = defaultZodiacs) throws {
+            try validator.validate(zodiacs: zodiacs)
+            self.zodiacs = zodiacs
+            self.dayOfYearToZodiac = ZodiacService.mapZodiacsToDaysOfYear(zodiacs: zodiacs,
+                                                                          validator: validator)
+        }
 
     /// Maps zodiac periods to days of the year.
     ///

Tests/ZodiacKitTests/Dates.swift

@@ -12,6 +12,7 @@ extension ZodiacKitTests {
 
     /// Tests that the service correctly identifies the Western Zodiac sign based on the 
     /// start date of each sign's period.
+    @ZodiacActor 
     func testStartDateReturnsCorrectSign() {
         let testCases: [(day: Int, month: Int, expectedSign: WesternZodiacSign)] = [
             // Each tuple represents the boundary start date for a zodiac sign and the expected sign.
@@ -37,6 +38,7 @@ extension ZodiacKitTests {
 
     /// Tests that the service correctly identifies the Western Zodiac sign based on the 
     /// end date of each sign's period.
+    @ZodiacActor
     func testEndDateReturnsCorrectSign() {
         let testCases: [(day: Int, month: Int, expectedSign: WesternZodiacSign)] = [
             // Each tuple represents the boundary end date for a zodiac sign and the expected sign.
@@ -63,6 +65,7 @@ extension ZodiacKitTests {
 
     /// Tests that the service correctly identifies the Western Zodiac sign for dates falling 
     /// in the middle of each sign's period.
+    @ZodiacActor
     func testDateInMiddleReturnsCorrectSign() {
         let orderedSigns: [WesternZodiacSign] = [
             .aquarius, .pisces, .aries, .taurus, .gemini,

Tests/ZodiacKitTests/Setup.swift

@@ -23,6 +23,7 @@ class ZodiacKitTests: XCTestCase {
 
     /// Sets up necessary instances before each test is run. This includes initializing the 
     /// `validator` and `service` variables.
+    @ZodiacActor
     override func setUp() {
         super.setUp()
         self.validator = DateValidator()