Add ThrottleRunner

Author: intitni

Tool/Sources/DebounceFunction/ThrottleFunction.swift

@@ -40,3 +40,40 @@ public actor ThrottleFunction<T> {
     }
 }
 
+public actor ThrottleRunner {
+    let duration: TimeInterval
+    var lastFinishTime: Date = .init(timeIntervalSince1970: 0)
+    var now: () -> Date = { Date() }
+    var task: Task<Void, Error>?
+
+    public init(duration: TimeInterval) {
+        self.duration = duration
+    }
+
+    public func throttle(block: @escaping () async -> Void) {
+        if task == nil {
+            scheduleTask(wait: now().timeIntervalSince(lastFinishTime) < duration, block: block)
+        }
+    }
+
+    func scheduleTask(wait: Bool, block: @escaping () async -> Void) {
+        task = Task.detached { [weak self] in
+            guard let self else { return }
+            do {
+                if wait {
+                    try await Task.sleep(nanoseconds: UInt64(duration * 1_000_000_000))
+                }
+                await block()
+                await finishTask()
+            } catch {
+                await finishTask()
+            }
+        }
+    }
+
+    func finishTask() {
+        task = nil
+        lastFinishTime = now()
+    }
+}
+