using System;

namespace Houdar.Core.Util.Common
{
    /// <summary>
    /// 单例基类
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class SingleBase<T> where T : new()
    {
        // ReSharper disable once InconsistentNaming
        private static readonly T _instance;

        // ReSharper disable once StaticFieldInGenericType
        private static readonly object ObjLock = new object();

        /// <summary>
        /// 获取单例句柄
        /// </summary>
        public static T Instance { get { return _instance; } }

        static SingleBase()
        {
            if (_instance != null) return;
            lock (ObjLock)
            {
                if (_instance == null)
                {
                    _instance = new T();
                }
            }
        }

        public SingleBase()
        {
            if (_instance != null)
            {
                throw new InvalidOperationException("单例模式设计，不允许重复实例化对象");
            }
        }
    }
}