stgsharp/StgSharp.Common/Timing/TimeProvider.cs

//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="TimeProvider"
// Project: StgSharp
// AuthorGroup: Nitload
// Copyright (c) Nitload. All rights reserved.
//     
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//     
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
using StgSharp.Timing;

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Threading;

namespace StgSharp
{
    public static partial class World
    {

        internal static StgSharpTime mainTimeProvider = new StgSharpTime();

        internal static TimeSourceProviderBase MainTimeProvider => mainTimeProvider;

    }

    public sealed class StgSharpTime : TimeSourceProviderBase
    {

        private static List<TimeSpanProvider> subscriberList = [];
        private static long accuracy;
        private static readonly Stopwatch mainProvider = new();
        private static Thread timeProvideThread;

        internal StgSharpTime() { }

        public static TimeSourceProviderBase OnlyInstance => World.MainTimeProvider;

        public sealed override void StartProvidingTime()
        {
            if (mainProvider.IsRunning) {
                return;
            }
            mainProvider.Start();

            // speed test
            long totalMS, internalFrequncy = Stopwatch.Frequency;
            for (int i = 0; i < 100; i++)
            {
                totalMS = mainProvider.ElapsedTicks / (internalFrequncy / (1000L * 1000L));
                for (int t = 0; t < 10; t++)
                {
                    if (totalMS < 1000) {
                        subscriberList.Add(
                            new TimeSpanProvider(100L, TimeSpanProvider.DefaultProvider));
                    }
                }
            }
            mainProvider.Stop();
            subscriberList.Clear();
            totalMS = mainProvider.ElapsedTicks / (internalFrequncy / (1000L * 1000L)) / 100L;
            accuracy = totalMS * 2 / 3;
            mainProvider.Reset();
            timeProvideThread = new Thread(new ThreadStart(ProvideTime));
            timeProvideThread.Start();
        }

        public override void StopProvidingTime()
        {
            lock (mainProvider) {
                mainProvider.Stop();
            }
        }

        public void Terminate()
        {
            lock (mainProvider) {
                mainProvider.Stop();
            }
        }

        protected sealed override void AddSubscriberUnsynced(TimeSpanProvider subscriber)
        {
            subscriberList.Add(subscriber);
        }

        protected sealed override void RemoveSubscriberUnsynced(TimeSpanProvider subscriber)
        {
            _ = subscriberList.Remove(subscriber);
        }

        private void ProvideTime()
        {
            long totalMS, internalFrequncy = Stopwatch.Frequency;
            lock (mainProvider) {
                mainProvider.Restart();
            }
            while (mainProvider.IsRunning)
            {
                totalMS = mainProvider.ElapsedTicks / (internalFrequncy / (1000L * 1000L));
                if (subscriberList.Count == 0)
                {
                    continue;
                }
                lock (SubscribeLock)
                {
                    List<TimeSpanProvider> toRemoveList = [];
                    foreach (TimeSpanProvider subscriber in subscriberList)
                    {
                        if (!subscriber.CheckTime(totalMS))
                        {
                            toRemoveList.Add(subscriber);
                            DefaultLog.InternalWriteLog(
                                $"Time subscriber {subscriber} is to be removed.", LogType.Info);
                        }
                        ;
                    }
                    if (toRemoveList.Count != 0)
                    {
                        foreach (TimeSpanProvider subscriber in toRemoveList) {
                            _ = subscriberList.Remove(subscriber);
                        }
                    }
                }
            }
        }

    }
}