HttpRuntime自定义定时更新缓存

最新推荐文章于 2022-12-07 14:21:00 发布

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最新推荐文章于 2022-12-07 14:21:00 发布

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CC 4.0 BY-SA版权

文章标签：数据库

原文链接：http://www.cnblogs.com/tianxue/p/3935801.html

本文详细介绍了缓存更新类的功能、属性及其内部工作原理，包括计时器、缓存时间、代理和入参等关键组件的作用。通过实例演示了如何使用缓存更新类来实现高效的数据缓存管理。

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缓存更新类如下:

    /// <summary>
    /// 缓存更新类
    /// </summary>
    /// <typeparam name="T">缓存对象</typeparam>
    public class UpdateCacheHelper<T>
    {
        /// <summary>
        /// 计时器
        /// </summary>
        private System.Threading.Timer timer;

        /// <summary>
        /// 缓存时间（分钟）
        /// </summary>
        private int saveTime;

        /// <summary>
        /// 默认（毫秒）
        /// </summary>
        private int intervalTime = 10 * 1000;

        /// <summary>
        /// 缓存键
        /// </summary>
        private string cacheKey = string.Empty;

        /// <summary>
        /// 代理
        /// </summary>
        private Delegate dele;

        /// <summary>
        /// 代理的入参
        /// </summary>
        private object[] objs;

        /// <summary>
        /// 更新缓存类
        /// </summary>
        /// <param name="dele">代理</param>
        /// <param name="cacheKey">key</param>
        /// <param name="saveTime">缓存时间（分钟）</param>
        /// <param name="intervalTime">间隔时间（秒）</param>
        /// <param name="objs">入参</param>
        public UpdateCacheHelper(Delegate dele, string cacheKey, int saveTime, int intervalTime, params object[] objs)
        {
            this.dele = dele;
            this.cacheKey = cacheKey;
            this.saveTime = saveTime;
            this.intervalTime = intervalTime * 1000;
            this.objs = objs;
            this.timer = new System.Threading.Timer(new System.Threading.TimerCallback(this.CheckDependencyCallBack), this, 0, this.intervalTime);
        }

        /// <summary>
        /// 从数据库获取数据
        /// </summary>
        /// <returns>数据</returns>
        public T GetData()
        {
            string assemblyName = this.dele.Target.GetType().Assembly.FullName;
            string typeName = this.dele.Target.GetType().FullName;

            object instance = Assembly.Load(assemblyName).CreateInstance(typeName);

            MethodInfo methodInfo = this.dele.Method;

            return (T)methodInfo.Invoke(instance, this.objs);
        }

        /// <summary>
        /// 回调函数
        /// </summary>
        /// <param name="sender">sender</param>
        private void CheckDependencyCallBack(object sender)
        {
            T newData = this.GetData();
            HttpRuntime.Cache.Insert(this.cacheKey, newData, null, Cache.NoAbsoluteExpiration, new TimeSpan(0, this.saveTime, 0), CacheItemPriority.NotRemovable, null);
        }
    }