cyf
273 lines
6.9 KiB
C#
273 lines
6.9 KiB
C#
/******************************************************************************
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Copyright 2005-2007 R2@DevFx.NET
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DevFx.NET is free software; you can redistribute it and/or modify
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it under the terms of the Lesser GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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DevFx.NET is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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Lesser GNU General Public License for more details.
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You should have received a copy of the Lesser GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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/*******************************************************************************/
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using System;
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using System.Timers;
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using Lskj.DevFx.Config;
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namespace Lskj.DevFx.Cache
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{
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/// <summary>
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/// 实行缓存器接口的存储器类
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/// </summary>
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public class Cache : ICache
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{
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/// <summary>
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/// 构造函数
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/// </summary>
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/// <param name="setting">缓存器的配置节</param>
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public Cache(IConfigSetting setting) {
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this.Init(setting);
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}
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/// <summary>
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/// 构造函数
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/// </summary>
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/// <param name="cacheStorage">指定存储器</param>
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/// <param name="interval">检测的间隔时间</param>
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public Cache(ICacheStorage cacheStorage, int interval) {
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this.Init(cacheStorage, interval);
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}
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/// <summary>
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/// 构造函数
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/// </summary>
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public Cache() {
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}
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private bool isInit;
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private IConfigSetting setting;
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private string name;
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private ICacheStorage cacheStorage;
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private int interval;
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private Timer timer;
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private bool IsInit() {
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if(!this.isInit) {
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throw new CacheException("缓存存储器没有被正确初始化");
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}
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return this.isInit;
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}
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private void Monitor() {
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if(this.interval <= 0) {
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return;
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}
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this.timer = new Timer(this.interval);
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this.timer.Enabled = false;
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this.timer.AutoReset = false;
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this.timer.Elapsed += new ElapsedEventHandler(TimerOnElapsed);
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this.timer.Start();
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}
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/// <summary>
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/// 轮询移除过期的缓存项
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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private void TimerOnElapsed(object sender, ElapsedEventArgs e) {
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this.timer.Enabled = false;
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for(int i = 0; i < this.cacheStorage.Count;) {
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CacheItem item = (CacheItem)this.cacheStorage[i];
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if(item != null && item.CacheDependency.IsExpired) {
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this.cacheStorage.RemoveAt(i);
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} else {
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i++;
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}
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}
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this.timer.Start();
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}
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/// <summary>
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/// 初始化
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/// </summary>
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/// <param name="cacheStorage">指定存储器</param>
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/// <param name="interval">检测的间隔时间</param>
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public void Init(ICacheStorage cacheStorage, int interval) {
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if(this.isInit) {
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return;
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}
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this.cacheStorage = cacheStorage;
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this.interval = interval;
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this.Monitor();
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this.isInit = true;
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}
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#region ICache Members
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/// <summary>
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/// 初始化
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/// </summary>
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/// <param name="setting">配置节</param>
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public void Init(IConfigSetting setting) {
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if(this.isInit) {
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return;
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}
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this.setting = setting;
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this.name = this.setting.Property["name"].Value;
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this.cacheStorage = setting["cacheStorage"].Property["type"].ToObject<ICacheStorage>(true);
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this.cacheStorage.Init(setting["cacheStorage"]);
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this.interval = setting.Property["interval"].ToInt32();
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this.Monitor();
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this.isInit = true;
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}
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/// <summary>
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/// 缓存器名称
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/// </summary>
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public string Name {
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get { return this.name; }
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}
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/// <summary>
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/// 缓存存储器
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/// </summary>
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public ICacheStorage CacheStorage {
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get { return this.cacheStorage; }
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}
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/// <summary>
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/// 以健值方式获取/设置缓存项（值）
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/// </summary>
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/// <param name="key">缓存项的健值</param>
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/// <remarks>
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/// 如果是设置值，则使用永不过期策略缓存
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/// </remarks>
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public object this[string key] {
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get { return this.Get(key); }
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set { this.Add(key, value, new NullCacheDependency()); }
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}
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/// <summary>
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/// 按指定健值和过期策略来设置缓存项（值）
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/// </summary>
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/// <param name="key">缓存项的健值</param>
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/// <param name="cacheDependency">缓存项的过期策略</param>
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public object this[string key, ICacheDependency cacheDependency] {
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set { this.Add(key, value, cacheDependency); }
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}
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/// <summary>
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/// 获取此缓存器所缓存项的个数
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/// </summary>
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public int Count {
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get {
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this.IsInit();
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return this.cacheStorage.Count;
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}
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}
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/// <summary>
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/// 添加一项到缓存器中
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/// </summary>
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/// <param name="key">缓存项的健值</param>
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/// <param name="value">缓存的对象</param>
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/// <param name="cacheDependency">缓存项的过期策略</param>
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public void Add(string key, object value, ICacheDependency cacheDependency) {
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this.IsInit();
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CacheItem item = (CacheItem)this.cacheStorage[key];
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if(item == null) {
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item = new CacheItem(key, value, cacheDependency);
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} else {
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item.Value = value;
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}
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this.cacheStorage[key] = item;
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}
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/// <summary>
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/// 添加一项到缓存器中
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/// </summary>
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/// <param name="key">缓存项的健值</param>
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/// <param name="value">缓存的对象</param>
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/// <remarks>
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/// 没有指定过期策略，则使用永不过期策略缓存
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/// </remarks>
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public void Add(string key, object value) {
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this.Add(key, value, new NullCacheDependency());
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}
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/// <summary>
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/// 获取缓存项
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/// </summary>
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/// <param name="key">缓存项的健值</param>
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/// <returns>缓存的对象，如果缓存中没有命中，则返回<c>null</c></returns>
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public object Get(string key) {
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this.IsInit();
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CacheItem item = (CacheItem)this.cacheStorage[key];
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object @value = null;
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if(item != null) {
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if(!item.CacheDependency.IsExpired) {
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@value = item.Value;
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item.Hits++;
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item.LastAccessTime = DateTime.Now;
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item.CacheDependency.Reset();
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} else {
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item = null;
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this.cacheStorage.Remove(key);
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}
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}
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return @value;
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}
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/// <summary>
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/// 获取缓存的项目
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/// </summary>
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/// <param name="key"></param>
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/// <returns></returns>
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public CacheItem GetCacheItem(string key)
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{
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this.IsInit();
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return this.cacheStorage[key] as CacheItem;
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}
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/// <summary>
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/// 移除缓存项
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/// </summary>
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/// <param name="key">缓存项的健值</param>
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public void Remove(string key) {
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this.IsInit();
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this.cacheStorage.Remove(key);
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}
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/// <summary>
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/// 判断缓存器中是否包含指定健值的缓存项
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/// </summary>
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/// <param name="key">缓存项的健值</param>
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/// <returns>是/否</returns>
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public bool Contains(string key) {
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this.IsInit();
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return this.cacheStorage.Contains(key);
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}
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/// <summary>
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/// 清除此缓存器中所有的项
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/// </summary>
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/// <remarks>
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/// 不影响配置文件中其他缓存器
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/// </remarks>
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public void Clear() {
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this.IsInit();
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this.cacheStorage.Clear();
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}
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#endregion
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}
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}
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