Question

我正在使用PO文件本地化ASP.NET MVC 5应用程序。

我创建了一个HTTP模块来交叉类型为html，javascript等的响应：

public class I18NModule : IHttpModule {

    private Regex _types;

    public I18NModule() {

      _types = new Regex(@"^(?:(?:(?:text|application)/(?:plain|html|xml|javascript|x-javascript|json|x-json))(?:\s*;.*)?)$");

    } // I18NModule

    public void Init(HttpApplication application) {
      application.ReleaseRequestState += OnReleaseRequestState;
    } // Init

    public void Dispose() {
    } // Dispose

    private void OnReleaseRequestState(Object sender, EventArgs e) {
      HttpContextBase context = new HttpContextWrapper(HttpContext.Current);
      if (_types != null && _types.Match(context.Response.ContentType).Success) 
        context.Response.Filter = new I18NFilter(context, context.Response.Filter, _service);
    } // Handle

} // I18NModule

然后我有一个I18NFilter如下：

public class I18NFilter : MemoryStream {

    private II18NNuggetService _service;
    protected HttpContextBase _context;
    private MemoryStream _buffer = new MemoryStream(); 
    protected Stream _output; 

    public I18NFilter(HttpContextBase context, Stream output, II18NNuggetService service) {
      _context = context;
      _output = output;
      _service = service;
    } // I18NFilter

    public override void Write(Byte[] buffer, Int32 offset, Int32 count) {
      _buffer.Write(buffer, offset, count);
    } // Write

    public override void Flush() {
      Encoding encoding = _context.Response.ContentEncoding;
      Byte[] buffer = _buffer.GetBuffer();
      String entity = encoding.GetString(buffer, 0, (Int32)_buffer.Length);
      _buffer.Dispose();
      _buffer = null;
      buffer = null;

      *USE SERVICE TO LOAD PO FILE AND PROCESS IT*

      buffer = encoding.GetBytes(entity);
      encoding = null;
      Int32 count = buffer.Length;
      _output.Write(buffer, 0, count);
      _output.Flush();
    } // Flush

} // I18NFilter

当我与响应相交时，我查找字符串为[[[some text]]]。＆＃34;一些文字＆＃34;将是我在PO文件中寻找当前线程语言的关键。

所以我需要为当前语言加载PO文件，处理它，并找到需要翻译的字符串。

我的问题是性能......我应该在静态类中加载整个文件吗？

我应该在每个请求中加载文件并使用CacheDependency吗？

我该怎么做？

Answer 1

由于这是一个HTTP应用程序，我会利用HttpRuntime.Cache。以下是如何使用它来最小化性能成本的示例：

public override void Flush() {
    ...
    var fileContents = GetLanguageFileContents();
    ...
}

private string GetLanguageFileContents(string languageName) {
    if (HttpRuntime.Cache[languageName] != null)
    {
        //Just pull it from memory!
        return (string)HttpRuntime.Cache[languageName];
    }
    else
    {
        //Take the IO hit  :(
        var fileContents = ReadFileFromDiskOrDatabase();
        //Store the data in memory to avoid future IO hits  :)
        HttpRuntime.Cache[languageName] = fileContents;
        return fileContents;
    }
}

将文件数据加载到静态类，将文件加载到缓存或其他选项？

1 个答案: