annotations/Azaion.Common/Extensions/ThrottleExtensions.cs

namespace Azaion.Common.Extensions;

public static class ThrottleExt
{
    private static bool _throttleRunFirstOn;
    public static async Task ThrottleRunFirst(this Func<Task> func, TimeSpan? throttleTime = null, CancellationToken cancellationToken = default)
    {
        if (_throttleRunFirstOn)
            return;

        _throttleRunFirstOn = true;
        await func();
        _ = Task.Run(async () =>
        {
            await Task.Delay(throttleTime ?? TimeSpan.FromMilliseconds(500), cancellationToken);
            _throttleRunFirstOn = false;
        }, cancellationToken);
    }

    private static bool _throttleRunAfter;
    public static async Task ThrottleRunAfter(this Func<Task> func, TimeSpan? throttleTime = null, CancellationToken cancellationToken = default)
    {
        if (_throttleRunAfter)
            return;

        _throttleRunAfter = true;
        _ = Task.Run(async () =>
        {
            await Task.Delay(throttleTime ?? TimeSpan.FromMilliseconds(500), cancellationToken);
            await func();
            _throttleRunAfter = false;
        }, cancellationToken);
        await Task.CompletedTask;
    }

}