//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="TimeSourceProvider"
// 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;

using System;
using System.Linq;
using System.Threading;

namespace StgSharp.Timing
{
    public abstract class TimeSourceProviderBase
    {

        public abstract long Frequency { get; }

        protected object SubscribeLock { get; } = new();

        public void AddSubscriber(TimeSpanProvider subscriber)
        {
            lock (SubscribeLock) {
                AddSubscriberUnsynced(subscriber);
            }
        }

        public abstract long GetCurrentTimeSpanTick();

        public void RemoveSubscriber(TimeSpanProvider subscriber)
        {
            lock (SubscribeLock) {
                RemoveSubscriberUnsynced(subscriber);
            }
        }

        public abstract void StartProvidingTime();

        public abstract void StopProvidingTime();

        protected abstract void AddSubscriberUnsynced(TimeSpanProvider subscriber);

        protected abstract void RemoveSubscriberUnsynced(TimeSpanProvider subscriber);

    }
}