using System;

using System.Collections.Generic;

​

public class CallStore

{

  Dictionary<int, Call> m_calls = new Dictionary<int, Call>();

  private Settings m_settings = new Settings();

​

  public CallStore()

  {

  }

  public Call FindOrCreateCall(int _id)

  {

    if (!m_calls.TryGetValue(_id, out Call call))

    {

      call = new Call(DateTime.Now);

      m_calls.Add(_id, call);

    }

​

    return call;

  }       

  public void CloseByTimeoutCalls()

  {

    foreach (var call in m_calls.Values)

    {

      if (DateTime.Now -call.CallCreateTime > m_settings.MaxCallDuration)

        call.Close();

    }

  }

}

​

public class Call

{

  public DateTime CallCreateTime { get; }

​

  public Call(DateTime _callCreateTime)

  {

    CallCreateTime = _callCreateTime;

  }

​

  public void Close() {/*do something long time*/}

}

​

public class Settings

{

  public TimeSpan MaxCallDuration => TimeSpan.FromHours(4);

}

​