/// <summary>
/// 使用本地缓存
/// </summary>
/// <param name="absoluteFilePath">生成文件的绝对路径</param>
/// <param name="fileContent">文件内容</param>
/// <param name="isGenerateFile">是否生成本地文件</param>
private static void UseLocalCache(string absoluteFilePath, string fileContent, bool isGenerateFile)
{
string fullFilePath = null;
if (isGenerateFile)
{
//如果需要生成本地静态文件
NVelocityBus.GenerateFile(absoluteFilePath, fileContent, out fullFilePath);//生成静态文件
}
if (string.IsNullOrEmpty(fullFilePath))
{
//如果生成文件失败，也放进缓存中（一级缓存），但是放入缓存的时间设置为绝对过期时间。防止频繁请求服务器端占用更多的资源。
DataCacheBus.Insert(absoluteFilePath, fileContent, DateTime.Now.AddMinutes(CACHE_DATETIME));
}
else
{
//如果生成文件成功，放入缓存并设置相对过期时间同时还加上缓存依赖。（一级缓存）
DataCacheBus.Insert(absoluteFilePath, fileContent, TimeSpan.FromMinutes(CACHE_DATETIME), fullFilePath);
}
}
public static void BeginRequest(HttpRequest request, HttpResponse response)
{
Uri filterUri = GetUriWithoutTrace(request, response);
int segmentsLength = filterUri.Segments.Length;
if (string.IsNullOrWhiteSpace(IOHelper.GetFileExtension(segmentsLength > 0 ? filterUri.Segments[segmentsLength - 1] : filterUri.AbsolutePath)) &&
string.IsNullOrWhiteSpace(filterUri.Query))
{//如果页面URL不带"/"结尾,需要添加"/"然后执行301跳转。wangyunpeng.
if (!string.IsNullOrWhiteSpace(filterUri.AbsolutePath) && !filterUri.AbsolutePath.EndsWith("/"))
{
Uri originalUri = request.Url;
UriBuilder uriBuilder = new UriBuilder(originalUri.Scheme, originalUri.Host, originalUri.Port);
uriBuilder.Path = string.Concat(originalUri.AbsolutePath, "/");
uriBuilder.Query = originalUri.Query;
string url301 = uriBuilder.ToString();
response.RedirectPermanent(url301, true);
return;
}
}
string physicalPath = request.PhysicalPath; //指定的路径或文件名太长,文件名必须少于 260 个字符
string absoluteFilePath = string.Concat(UrlHasher.Hash(filterUri, physicalPath, "/"), NVelocityBus.DEFAULT_DOCUMENT_SUFFIX); //所有url全部hash存放到redis和本地内存中去。区分URL大小写。wangyunpeng。2016-7-20。
request.RequestContext.HttpContext.Items[NVelocityBus.NVELOCITY_TARGET_FILE_PATH] = absoluteFilePath; //设置放入上下文对象里面获取,2015-11-17。wangyunpeng
//读取本地缓存(一级缓存)
string fileContent = DataCacheBus.Get(absoluteFilePath) as string;
//读取Redis缓存(二级缓存)
if (NVelocityBus.CACHE_REDIS && string.IsNullOrWhiteSpace(fileContent))
{
try
{
fileContent = "";//StackExchangeRedisBus.StringGet(absoluteFilePath);
}
catch (Exception)
{ }
if (!string.IsNullOrWhiteSpace(fileContent))
{//放进缓存中（一级缓存）
DataCacheBus.Insert(absoluteFilePath, fileContent = ZipHelper.GZipDeCompress(fileContent), DateTime.Now.AddMinutes(NVelocityBus.CACHE_DATETIME));
}
}
//如果仅采用本地缓存策略，需要从磁盘上读取静态文件。(防止清除本地缓存后访问量过大，改从静态文件读取)
if (!NVelocityBus.CACHE_REDIS && string.IsNullOrWhiteSpace(fileContent))
{
string physicalFilePath = null;
string fileExtension = IOHelper.GetFileExtension(absoluteFilePath);
if (!string.IsNullOrWhiteSpace(fileExtension) && fileExtension.Equals(NVelocityBus.DEFAULT_DOCUMENT_SUFFIX, StringComparison.CurrentCultureIgnoreCase))
{
physicalFilePath = NVelocityBus.GenerateFilePath(absoluteFilePath);
DateTime fileDateTime = IOHelper.GetFileMaxDateTime(physicalFilePath);
if (fileDateTime != DateTime.MinValue)
{ //如果静态文件存在
if (fileDateTime.AddDays(NVelocityBus.CACHE_DAY) > DateTime.Now)
{ //只读CACHE_DAY天之内的静态文件.
fileContent = IOHelper.GetFileContent(physicalFilePath);
}
else
{ //超过CACHE_DAY天之外的静态文件会自动删除.
IOHelper.DeleteFile(physicalFilePath);
}
}
}
if (!string.IsNullOrWhiteSpace(fileContent) && !string.IsNullOrWhiteSpace(physicalFilePath))
{ //如果读取磁盘上的文件成功
DataCacheBus.Insert(absoluteFilePath, fileContent, TimeSpan.FromMinutes(NVelocityBus.CACHE_DATETIME), physicalFilePath); //放入本地缓存(一级缓存)
}
}
if (!string.IsNullOrWhiteSpace(fileContent))
{
NVelocityBus.Output(request, response, fileContent, absoluteFilePath, true);
}
fileContent = null;
absoluteFilePath = null;
}