DD.WellWorkover.Cloud/AsbCloudInfrastructure/Services/TelemetryTracker.cs

using System;
using System.Collections.Generic;
using System.Linq;
using AsbCloudApp.Services;

namespace AsbCloudInfrastructure.Services
{
    public class TelemetryTracker : ITelemetryTracker
    {
        private IDictionary<string, DateTime> _requests = new Dictionary<string, DateTime>();
        private readonly TimeSpan _timeout = TimeSpan.FromMinutes(6);

        private void _deleteOldRequests()
        {
            _requests = _requests.Where(dValue => (DateTime.Now - dValue.Value) < _timeout).ToDictionary(dValue => dValue.Key, dValue => dValue.Value);
        }

        public void SaveRequest(string id)
        {
            _requests[id] = DateTime.Now;
            _deleteOldRequests();
        }

        public IEnumerable<string> GetRequests()
        {
            _deleteOldRequests();
            return _requests.Keys;
        }
    }
}