using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using QM.Exchange.Interface;
using System.Collections.Concurrent;
using QM.Exchange.Core.ProcessProgram;

namespace QM.Exchange.Core.Services
{
    ///<summary>
    /// 功能描述：MessageQueueService 消息队列服务
    /// 作    者：董雪夫
    /// 编写日期：2017.8.22
    ///</summary>
    public class MessageQueueService : IService
    {
        private static ConcurrentQueue<CommonMessage> queue;

        private bool _running;

        internal MessageQueueService()
        {
            queue = new ConcurrentQueue<CommonMessage>();
        }

        /// <summary>
        /// 开启消息队列服务
        /// </summary>
        public void Start()
        {
            _running = true;
            while (_running)
            {
                var msg = Dequeue();
                if (msg != null)
                {
                    CommandExecutor executor = new CommandFactory().CreateExecutor(msg);

                    executor.Execute();
                }
                System.Threading.Thread.Sleep(10);
            }
        }

        /// <summary>
        /// 关闭
        /// </summary>
        public void Stop()
        {
            _running = false;
        }

        /// <summary>
        /// 把消息加入消息队列服务
        /// </summary>
        /// <param name="msg">消息实体</param>
        public static void Enqueue(CommonMessage msg)
        {
            queue.Enqueue(msg);
        }

        /// <summary>
        /// 从消息队列服务读取服务
        /// </summary>
        /// <returns>消息实体</returns>
        private static CommonMessage Dequeue()
        {
            CommonMessage msg;
            queue.TryDequeue(out msg);
            return msg;
        }
    }
}