commentserviceproxy.cs

来自「该项目中对 SQLHelper 类进行了简单封装」· CS 代码 · 共 108 行

/* 
 * CommentServiceProxy.cs @Microsoft Visual Studio 2008 <.NET Framework 3.5>
 * AfritXia
 * 2008-01-25
 * 
 * Copyright(c) http://www.AfritXia.NET/
 * 
 */

using System;
using System.Collections.Generic;
using System.ServiceModel;
using System.Web;
using System.Web.Caching;

using NET.AfritXia.MyHome.HomeStart.HomeAppServer.CommentServiceRef;
using NET.AfritXia.MyHome.Model;
using NET.AfritXia.MyHome.Model.Message;
using NET.AfritXia.MyHome.ServiceInterface;

namespace NET.AfritXia.MyHome.HomeStart.CodeLand.ServiceProxy
{
	/// <summary>
	/// 评论服务代理类
	/// </summary>
	public class CommentServiceProxy : ICommentService, IDisposable
	{
		// 缓存键集合
		private static readonly IList<string> g_cacheKeyList = new List<string>();
		// 代理对象
		private CommentServiceClient m_proxyObj = null;

		#region 类构造器
		/// <summary>
		/// 类默认构造器
		/// </summary>
		public CommentServiceProxy()
		{
			this.m_proxyObj = new CommentServiceClient();
			this.m_proxyObj.Open();
		}
		#endregion

		#region ICommentService Members
		public void Append(Comment newComment)
		{
			this.m_proxyObj.Append(newComment);

			foreach (string cacheKey in g_cacheKeyList)
				HttpContext.Current.Cache.Remove(cacheKey);

			g_cacheKeyList.Clear();
		}

		public void Delete(int commentUID)
		{
			throw new NotSupportedException("不支持该操作 ( Not supported ) ");
		}

		public IList<Comment> ViewCommentList(int belongToArticleUID)
		{
			string cacheKey = null;

			// 计算缓存键
			cacheKey = "CommentServiceProxy.ViewCommentList(belongToArticleUID = {0})";
			cacheKey = String.Format(cacheKey, belongToArticleUID);

			if (g_cacheKeyList.Contains(cacheKey) == false)
				g_cacheKeyList.Add(cacheKey);

			// 从缓存中获取评论集合
			IList<Comment> commentList = HttpContext.Current.Cache[cacheKey] as IList<Comment>;

			if (commentList != null)
				return commentList;

			// 调用远程服务获取评论列表
			commentList = this.m_proxyObj.ViewCommentList(belongToArticleUID);

			// 缓存评论列表, 20 分钟后过期
			HttpContext.Current.Cache.Insert(cacheKey, commentList, null,
				DateTime.Now.AddMinutes(20), Cache.NoSlidingExpiration);

			return commentList;
		}

		public string Actor
		{
			set
			{
				this.m_proxyObj.Actor = value;
			}

			get
			{
				return this.m_proxyObj.Actor;
			}
		}
		#endregion

		#region IDisposable Members
		public void Dispose()
		{
			this.m_proxyObj.Close();
		}
		#endregion
	}
}