I just saw that ResourceStreamerImpl.java checks modification time and does
...
response.sendError(HttpServletResponse.SC_NOT_MODIFIED, "");
Is there a way for me to achieve the same from my onActivate() method
below ...
I.e. how do I return a 304 when my image hasn't been changed according to
the
I*f-Modified-Since* header that I receive.
Or do I have to it in some other way .. I guess so!
2012/2/26 Howard Lewis Ship <hls...@gmail.com>
> Do the images ever change? If not, you can use the same kind of
> approach Tapestry uses for assets: incorporate a version number (or
> SHA1 checksum) into the path, and set the headers that ensure caching
> on the client (I'd have to check the Tapestry code for the exact ones
> that work).
>
> On Sat, Feb 25, 2012 at 9:25 AM, Gunnar Eketrapp
> <gunnar.eketr...@gmail.com> wrote:
> > Hi!
> >
> > I currently store uploaded files in the db.
> >
> > I then retrieve those images with via an Image page.
> >
> > My problem now is that the client does not cache these images.
> >
> > Is there an easy way to fix my erreneous solution !?
> >
> > public void prepareResponse(Response r) {
> > r.setHeader("Cache-Control", "max-age=3600");
> > }
> >
> > I have included the entire Image.java below ...
> >
> > Thanks in advance,
> > Gunnar
> >
> > ================================================================
> >
> > package utskicket.pages;
> >
> > import java.io.IOException;
> > import java.io.InputStream;
> >
> > import org.apache.tapestry5.StreamResponse;
> > import org.apache.tapestry5.ioc.annotations.Inject;
> > import org.apache.tapestry5.services.Response;
> > import org.slf4j.Logger;
> >
> > import utskicket.base.BasePage;
> > import utskicket.model.dao.UploadedFileDAO;
> > import utskicket.model.entity.UploadedFile;
> >
> >
> > public class Image extends BasePage {
> >
> > private Long groupId;
> > private Long imageId;
> >
> > @Inject
> > private UploadedFileDAO fileDAO;
> >
> > @Inject
> > private Logger log;
> >
> > public class UploadedFileStreamResponse implements StreamResponse {
> > private final UploadedFile file;
> >
> > public UploadedFileStreamResponse(UploadedFile file) {
> > this.file = file;
> > }
> >
> > public String getContentType() {
> > return file.getContentType();
> > }
> >
> > public InputStream getStream() throws IOException {
> > return file.getInputStream();
> > }
> >
> > // TODO: Find out how to get images cached by browser's. This does
> > not work!
> > public void prepareResponse(Response r) {
> > r.setHeader("Cache-Control", "max-age=3600");
> > }
> > }
> >
> > //
> >
> ------------------------------------------------------------------------------
> > // -- Tapestry event methods - Tapestry event methods - Tapestry event
> > methods --
> > //
> >
> ------------------------------------------------------------------------------
> >
> > StreamResponse onActivate(Long groupId, Long imageId) {
> > this.groupId = groupId;
> > this.imageId = imageId;
> >
> > // UploadedFile file = cache.uploadedFileLookup(imageId);
> > UploadedFile file = fileDAO.findById(imageId);
> >
> > if (null == file) {
> > log.warn("Failed to load image #" + imageId);
> > return null;
> > } else {
> > log.debug("Loaded file #" + imageId + " with a size of " +
> > file.getContent().length + " bytes");
> > return new UploadedFileStreamResponse(file);
> > }
> > }
> >
> > Object[] onPassivate() {
> > return new Object [] {groupId, imageId};
> > }
> > }
>
>
>
> --
> Howard M. Lewis Ship
>
> Creator of Apache Tapestry
>
> The source for Tapestry training, mentoring and support. Contact me to
> learn how I can get you up and productive in Tapestry fast!
>
> (971) 678-5210
> http://howardlewisship.com
>
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