Re: [Simpleweb-Support] HTTP Compression

[Niall G. <gal...@ya...>]

Hi Brian,

Take a look a http://zoe.nu, this uses compression
with Simple. I did implement compression in Simple, I
was not impressed with the performance results and it
added complexity I did not need. 

Also, compression is not always best implemented in
the Response object. I am unsure how you are serving
content. However encoding in a cache, or file system
interface is a good solution. For example:


public class GzipContent implements Content {

    public GzipContent(SomeSource source) {
       // set up your source
    }  

    public void write(OutputStream out) {
        compressedBytes = // get from cache or dynamic
source
 
        out.write(compressedBytes);
    }

    public String getMimeType() {
        return "text/html; charset=utf-8"
    }
 
    public String getEncoding() {
        return "gzip";
    }
}

This allows you to use the object to transfer info and
meta-data easily, also it gives you more choice in
what gets compressed. 

Niall

--- Brian Davis <wic...@gm...> wrote:

> Hmm... can't seem to get this to work..
> 
> also a couple things bother me... first.. in order
> to do it this way I
> won't be able to set the content-length because
> whatever i set would
> be wrong.. also.. compression should be handled at
> the framework level
> if possible.. so.. I was really just wondering why
> it wasn't
> supported... out of the box per-se
> 
> anyway.. thanks for the help!
> 
> /Brian
> 
> On 12/13/05, Brian Davis <wic...@gm...>
> wrote:
> > Hey cool.. I will look at this in a day or two and
> let you know how it
> > goes.. did you guys do anything with deflate or
> just gzip?
> >
> > /Brian
> >
> >
> > On 12/13/05, Christophe Roudet
> <cr...@ac...> wrote:
> > > I have done this with a custom ProtocolHandler:
> > >
> > > public class ServerHandler implements
> ProtocolHandler {
> > >   private ProtocolHandler _handler;
> > >   private static final Logger _logger =
> > > Logger.getLogger(ServerHandler.class);
> > >
> > >   // =============
> > >   // Constructor
> > >   // =============
> > >
> > >   public ServerHandler(ProtocolHandler handler)
> {
> > >     _handler = handler;
> > >   }
> > >
> > >   // ===============
> > >   // Public methods
> > >   // ===============
> > >
> > >   public void handle(Request req, Response resp)
> {
> > >     resp.set("Server", "Simple");
> > >     resp.setDate("Date",
> System.currentTimeMillis());
> > >     // check for compressed request
> > >     String contentEncoding =
> req.getValue("Content-Encoding");
> > >     if ((contentEncoding != null)
> > >         &&
> (contentEncoding.toLowerCase().indexOf("gzip") >
> -1)) {
> > >       _logger.debug("Request is zipped.");
> > >       req = new GZipRequest(req,
> SimpleWeb.BUFFER_SIZE);
> > >     }
> > >     // does the client accept compressed
> response?
> > >     String acceptEncoding =
> req.getValue("Accept-Encoding");
> > >     if ((!"GET".equals(req.getMethod())) &&
> (acceptEncoding != null)
> > >         &&
> (acceptEncoding.toLowerCase().indexOf("gzip") > -1))
> {
> > >       _logger.debug("Response will be zipped.");
> > >       resp = new GZipResponse(resp);
> > >     }
> > >     /*
> > >      * Hand the request over to the real server
> so that targeted service can
> > > be
> > >      * executed.
> > >      */
> > >     _handler.handle(req, resp);
> > >   }
> > > }
> > >
> > > --------------------
> > > And the GZipRequest and GZipResponse are mainly
> a wrapper on a request where
> > > stream getter methods return a GZIP stream:
> > >
> > >
> > > public class GZipRequest implements Request {
> //extends FilterRequest {
> > >   private int _size;
> > >   private Request _req;
> > >
> > >   // =============
> > >   // Constructor
> > >   // =============
> > >
> > >   /**
> > >    * Wraps the specified request stream into a
> GZipStream.
> > >    */
> > >   public GZipRequest(Request request, int size)
> {
> > >     //super(request);
> > >     _req = request;
> > >     if (size <=0) {
> > >       _size = 2048;
> > >     } else {
> > >       _size = size;
> > >     }
> > >   }
> > >
> > >   // ===============
> > >   // Public methods
> > >   // ===============
> > >
> > >   /**
> > >    * Returns a GZIPInputStream.
> > >    */
> > >   public InputStream getInputStream() throws
> IOException {
> > >    return new
> GZIPInputStream(_req.getInputStream(), _size);
> > >   }
> > >
> > >   /**
> > >    * This can be used to get the URI specified
> for this HTTP
> > >    * request. This corresponds to the /index
> part of a
> > >    * http://www.domain.com/index URL but may
> contain the full
> > >    * URL. This can be set using
> <code>setURI</code>.
> > >    *
> > >    * @return the URI that this HTTP request is
> targeting
> > >    */
> > >   public String getURI(){
> > >      return _req.getURI();
> > >   }
> > >
> > >   /**
> > >    * This can be used to set the URI for this
> HTTP request.
> > >    * The <code>getURI</code> will return the
> String entered
> > >    * which can be a full HTTP URL or a relative
> path URL.
> > >    *
> > >    * @param uri the URI that this HTTP request
> is to use
> > >    */
> > >   public void setURI(String uri){
> > >      _req.setURI(uri);
> > >   }
> > >
> > >   /**
> > >    * This can be used to get the HTTP method for
> this
> > >    * request. The HTTP specification RFC 2616
> specifies the
> > >    * HTTP request methods in section 9, Method
> Definitions.
> > >    *
> > >    * @return the request method for this request
> > >    */
> > >   public String getMethod(){
> > >      return _req.getMethod();
> > >   }
> > >
> > >   ...
> > >
> > > ------------------
> > >
> > > public class GZipResponse implements Response {
> //extends FilterResponse {
> > >   private Response _resp;
> > >
> > >   // =============
> > >   // Constructors
> > >   // =============
> > >
> > >   /**
> > >    * Creates a GZipResponse for the specified
> Response.
> > >    */
> > >   public GZipResponse(Response response) {
> > >     //super(response);
> > >     _resp = response;
> > >     _resp.set("Content-Encoding", "gzip");
> > >   }
> > >
> > >   // ==============
> > >   // Public methods
> > >   // ===============
> 
=== message truncated ===


Niall Gallagher

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