Rate Limiting in ActionScript

Rate limiting is an important mechanism for controlling resource utilization and maintaining quality of service. ActionScript can implement rate limiting using timers and event-driven programming.

package {
    import flash.display.Sprite;
    import flash.events.TimerEvent;
    import flash.utils.Timer;
    import flash.utils.getTimer;

    public class RateLimiting extends Sprite {
        private var requests:Array = [];
        private var limiter:Timer;
        private var burstyLimiter:Timer;
        private var burstyRequests:Array = [];
        private var burstCapacity:int = 3;

        public function RateLimiting() {
            // First we'll look at basic rate limiting. Suppose
            // we want to limit our handling of incoming requests.
            for (var i:int = 1; i <= 5; i++) {
                requests.push(i);
            }

            // This limiter will trigger an event every 200 milliseconds.
            // This is the regulator in our rate limiting scheme.
            limiter = new Timer(200);
            limiter.addEventListener(TimerEvent.TIMER, handleRequest);
            limiter.start();

            // Now we'll look at bursty rate limiting
            burstyLimiter = new Timer(200);
            burstyLimiter.addEventListener(TimerEvent.TIMER, handleBurstyRequest);

            // Fill up the burst capacity
            for (i = 0; i < burstCapacity; i++) {
                handleBurstyRequest(null);
            }

            // Simulate 5 more incoming requests
            for (i = 1; i <= 5; i++) {
                burstyRequests.push(i);
            }

            burstyLimiter.start();
        }

        private function handleRequest(event:TimerEvent):void {
            if (requests.length > 0) {
                var req:int = requests.shift();
                trace("request", req, new Date());
            } else {
                limiter.stop();
            }
        }

        private function handleBurstyRequest(event:TimerEvent):void {
            if (burstyRequests.length > 0) {
                var req:int = burstyRequests.shift();
                trace("bursty request", req, new Date());
            } else if (event != null) {
                burstyLimiter.stop();
            }
        }
    }
}

In this ActionScript implementation:

We use Timer objects to simulate the rate limiting behavior. The limiter timer fires every 200 milliseconds, similar to the Go example.
Instead of channels, we use Arrays (requests and burstyRequests) to store the incoming requests.
The handleRequest and handleBurstyRequest methods are event handlers that process a request each time the respective timer fires.
For the bursty limiter, we initialize it with a capacity of 3, similar to the Go example. We immediately process up to 3 requests to simulate the burst capability.
We use trace instead of fmt.Println to output the results.

To run this program, you would need to set up a Flash/Flex project and run it in a Flash Player or AIR runtime environment. The output would be similar to the Go example, with requests being processed at regular intervals and the bursty requests showing a burst of quick processing followed by the regular interval.

This ActionScript implementation demonstrates the concept of rate limiting, although it uses a different programming paradigm (event-driven) compared to Go’s concurrent approach with goroutines and channels.

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Rate Limiting in ActionScript