Why not just build yourself an 'ImageServer' component.
Then build yourself an engine service that spits back an image and
takes a parameter.
Have that component spit out a <img> with a url pointing back to a
custom service (make sure you encode your parameter).
Then have your service load and feed the img in its service method?
Here's a graphic builder service I did a while ago. It's not a general case
solution, but it'll give you an idea.
package services;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import org.apache.tapestry.IComponent;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.engine.AbstractService;
import org.apache.tapestry.engine.IEngineServiceView;
import org.apache.tapestry.engine.ILink;
import org.apache.tapestry.request.ResponseOutputStream;
import processmodel.ProcessDescription;
import data.HibHelper;
public class GraphicBuilder extends AbstractService {
public static final String SERVICE_NAME = "GraphicBuilder";
public ILink getLink(IRequestCycle cycle, IComponent component,
Object[] parms) {
String[] context;
String pageName = component.getPage().getPageName();
String idPath = component.getIdPath();
if (idPath != null) {
context = new String[2];
context[1] = idPath;
} else
context = new String[1];
context[0] = pageName;
return constructLink(cycle, SERVICE_NAME, context, parms,
true);
}
public void service(IEngineServiceView acrg0, IRequestCycle cycle,
ResponseOutputStream response) throws
ServletException, IOException {
Object[] parms = this.getParameters(cycle);
String id = (String) parms[0];
ProcessDescription pd = (ProcessDescription)
HibHelper.getSession().get(ProcessDescription.class, id);
BufferedImage bufferedImage = pd.toGraphic();
response.setContentType("image/png");
synchronized (this) {
ImageIO.write(bufferedImage, "png", response);
}
}
public String getName() {
return SERVICE_NAME;
}
}
> -----Original Message-----
> From: Jelena Jovanovic [mailto:[EMAIL PROTECTED]
> Sent: Saturday, July 09, 2005 5:34 AM
> To: [email protected]
> Subject: Loading images on the fly
>
> Hi everyone,
>
> I need to include one or more images in a page
> that is dynamically created. Which images should
> be included in the page is determined during the
> runtime. Images that I work with are kept in a
> subdirectory of the context directory. However,
> the images collection is rather large and can
> increase during the program execution, so I can
> not enumerate those images as assets in the .page
> file. I saw that there are some classes that
> implement IAsset interface and I guess that I
> should use one of them, but I do not know how. Can
> anyone send a piece of code showing how to handle
> this problem?
>
>
> Regards,
>
> Jelena
>
>
>
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