init lserp cs 5.0

2026-07-10 15:25:05 +08:00
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+/******************************************************************************
+	Copyright 2005-2007 R2@DevFx.NET 
+	DevFx.NET is free software; you can redistribute it and/or modify
+	it under the terms of the Lesser GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	DevFx.NET is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	Lesser GNU General Public License for more details.
+
+	You should have received a copy of the Lesser GNU General Public License
+	along with this program; if not, write to the Free Software
+	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+/*******************************************************************************/
+
+using System;
+using System.IO;
+
+namespace Lskj.DevFx.Cache
+{
+	/// <summary>
+	/// 文件依赖方式的过期策略
+	/// </summary>
+	[Serializable]
+	public class FileCacheDependency : ICacheDependency
+	{
+		/// <summary>
+		/// 构造函数
+		/// </summary>
+		/// <param name="fileName">需要监视的文件名（包含路径）</param>
+		/// <param name="filters">监视方式</param>
+		public FileCacheDependency(string fileName, NotifyFilters filters) {
+			this.fileName = fileName;
+			this.filters = filters;
+			this.init();
+		}
+
+		/// <summary>
+		/// 构造函数
+		/// </summary>
+		/// <param name="fileName">需要监视的文件名（包含路径）</param>
+		/// <remarks>
+		/// 监视方式默认为文件的最后写入（修改）时间
+		/// </remarks>
+		public FileCacheDependency(string fileName) : this(fileName, NotifyFilters.LastWrite) {
+		}
+
+		private string fileName;
+		private FileSystemWatcher fileWatcher;
+		private NotifyFilters filters;
+		private bool isExpired = false;
+
+		private void init() {
+			string fileName = Path.GetFileName(this.fileName);
+			string filePath = Path.GetDirectoryName(this.fileName);
+			this.fileWatcher = new FileSystemWatcher(filePath, fileName);
+			this.fileWatcher.NotifyFilter = this.filters;
+			this.fileWatcher.Changed += new FileSystemEventHandler(this.FileChanged);
+			this.fileWatcher.EnableRaisingEvents = true;
+		}
+
+		private void FileChanged(object sender, FileSystemEventArgs e) {
+			this.fileWatcher.EnableRaisingEvents = false;
+			this.isExpired = true;
+			this.fileWatcher.Dispose();
+			this.fileWatcher = null;
+		}
+
+		#region ICacheDependency Members
+
+		/// <summary>
+		/// 是否已过期
+		/// </summary>
+		public bool IsExpired {
+			get { return this.isExpired; }
+		}
+
+		/// <summary>
+		/// 重置缓存策略（相当于重新开始缓存）
+		/// </summary>
+		public void Reset() {
+		}
+
+		#endregion
+	}
+}