annotations/Azaion.Common/Extensions/ThrottleExtensions.cs

namespace Azaion.Common.Extensions;

public static class ThrottleExt
{
    private static readonly Dictionary<Delegate, DateTime> LastExecution = new();
    private static readonly object Lock = new();

    public static async Task Throttle(this Func<Task> func, TimeSpan interval, CancellationToken ct = default)
    {
        ArgumentNullException.ThrowIfNull(func);

        lock (Lock)
        {
            if (LastExecution.ContainsKey(func) && DateTime.UtcNow - LastExecution[func] < interval)
                return;

            func();
            LastExecution[func] = DateTime.UtcNow;
        }
    }

}