cyf
89 lines
2.6 KiB
C#
89 lines
2.6 KiB
C#
/******************************************************************************
|
|
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
|
|
}
|
|
}
|