public Stream Read(CacheVariable variable)
{
byte[] buffer = null;
if (_contentData.TryGetValue(variable.UniqueCode, out buffer))
{
return(new MemoryStream(buffer));
}
return(null);
}
public void Delete(CacheVariable variable)
{
const string sql = "delete from dbo.cache where code=@code";
var prms = SqlHelper.CreateParameters((c) =>
{
c.Add("@code", variable.UniqueCode);
});
SqlHelper.ExecuteCommandText("db-cache", sql, prms);
}
/// <summary>
/// 更新缓存器内容
/// </summary>
/// <param name="variable"></param>
public void Update(CacheVariable variable, Stream content)
{
if (content.Length > int.MaxValue)
{
throw new WebCacheException("MemoryStorage无法存储超过" + int.MaxValue + "个字节的缓存内容！");
}
byte[] buffer = new byte[content.Length];
content.ReadPro(buffer, 0, (int)content.Length);
_contentData.AddOrUpdate(variable.UniqueCode, buffer, (key, value) => buffer);
_modifiedData.AddOrUpdate(variable.UniqueCode, DateTime.Now, (key, value) => DateTime.Now);
}
public void Delete(CacheVariable variable)
{
var host = new WebHost(variable.Url);
var target = string.Format("{0}://{1}/cache/memory.htm?code={2}", host.Protocol, host.Host, HttpUtility.UrlEncode(variable.UniqueCode, Encoding.UTF8));
using (WebClient client = new WebClient())
{
try
{
client.DownloadData(target);
}
catch (Exception ex)
{
throw ex;
}
}
}
/// <summary>
/// 更新缓存器内容
/// </summary>
/// <param name="url"></param>
public void Update(CacheVariable variable, Stream content)
{
if (content.Length > int.MaxValue)
{
throw new WebCacheException("SqlCacheStorage无法存储超过" + int.MaxValue + "个字节的缓存内容！");
}
byte[] buffer = new byte[content.Length];
content.ReadPro(buffer, 0, (int)content.Length);
var prms = SqlHelper.CreateParameters((c) =>
{
c.Add("@code", variable.UniqueCode);
c.Add("@cont", buffer);
});
SqlData data = SqlHelper.ExecuteCommandText("db-cache", _updateContentSql, prms);
}
public Stream Read(CacheVariable variable)
{
const string sql = "select cont from dbo.cache where code=@code";
var prms = SqlHelper.CreateParameters((c) =>
{
c.Add("@code", variable.UniqueCode);
});
SqlData data = SqlHelper.ExecuteCommandText("db-cache", sql, prms);
if (data.IsEmpty())
{
return(null);
}
byte[] buffer = data.GetScalar <byte[]>();
return(new MemoryStream(buffer));
}
public bool TryGetLastModified(CacheVariable variable, out DateTime lastModified)
{
lastModified = DateTime.Now;
const string sql = "select lastModified from dbo.cache where code=@code";
var prms = SqlHelper.CreateParameters((c) =>
{
c.Add("@code", variable.UniqueCode);
});
SqlData data = SqlHelper.ExecuteCommandText("db-cache", sql, prms);
if (data.IsEmpty())
{
return(false);
}
lastModified = data.GetScalar <DateTime>();
return(true);
}
public void Delete(CacheVariable variable)
{
}
/// <summary>
/// 更新缓存器内容
/// </summary>
/// <param name="variable"></param>
public void Update(CacheVariable variable, Stream content)
{
}
public Stream Read(CacheVariable variable)
{
return(null);
}
public bool TryGetLastModified(CacheVariable variable, out DateTime lastModified)
{
lastModified = DateTime.Now;
return(false);
}
/// <summary>
/// 向缓存区中写入信息
/// </summary>
/// <param name="content"></param>
public override void Write(WebPageContext context, Stream content, ICacheStorage storage)
{
var variable = new CacheVariable(GetUrl(context), context.CompressionType, context.Device);
storage.Update(variable, content);
}
/// <summary>
/// 读取缓存区中的流信息
/// </summary>
/// <returns></returns>
public override Stream Read(WebPageContext context, ICacheStorage storage)
{
var variable = new CacheVariable(GetUrl(context), context.CompressionType, context.Device);
return(storage.Read(variable));
}
protected bool TryGetCacheTime(WebPageContext context, out DateTime cacheTime, ICacheStorage storage)
{
var variable = new CacheVariable(GetUrl(context), context.CompressionType, context.Device);
return(storage.TryGetLastModified(variable, out cacheTime));
}
public bool TryGetLastModified(CacheVariable variable, out DateTime lastModified)
{
return(_modifiedData.TryGetValue(variable.UniqueCode, out lastModified));
}