Warroom/warroom-system/Library/Mirle.Component.API.AutomatedGuideVehicleController/Entities/MessageSequnce.cs

namespace Mirle.Component.API.AutomatedGuideVehicleController.Entities
{
    /// <summary>
    /// Class for message sequnce number
    /// </summary>
    public class MessageSequnce
    {
        /// <summary>
        /// Constructure
        /// </summary>
        protected MessageSequnce()
        {
            _sequence = 0;
        }

        #region === [Private Properties] ===

        /// <summary>
        /// Message sequnce number
        /// </summary>
        private static volatile MessageSequnce _messageSequnce;
        /// <summary>
        /// Lock of message sequnce number
        /// </summary>
        private static readonly object _syncRoot = new object();
        /// <summary>
        /// Sequnce number
        /// </summary>
        private int _sequence;
        /// <summary>
        /// Lock of get sequnce number
        /// </summary>
        private static readonly object _messageLock = new object();

        #endregion

        /// <summary>
        /// Message Sequnce instance
        /// </summary>
        public static MessageSequnce Instance
        {
            get
            {
                lock (_syncRoot)
                {
                    _messageSequnce ??= new MessageSequnce();
                    return _messageSequnce;
                }
            }
        }
        /// <summary>
        /// Message sequnce number
        /// </summary>
        public string Sequence
        {
            get
            {
                lock (_messageLock)
                {
                    if (_sequence == 0 || _sequence == 999999)
                    {
                        _sequence = 1;
                    }
                    else
                    {
                        _sequence++;
                    }
                    return _sequence.ToString().PadLeft(6, '0');
                }
            }
        }
    }
}