Hi
I've a problem when merging multiple PDFs in-memory to one single
document (I calle it CompoundDocument). I use the iText library.
I extracted some code out of the commandline tool "concat_pdf" and
adjusted the logic to read the documents from bytearraystreams instead
of reading files (please see the source code snippets below).
I assume that the merging of the docs works well, because if I run the
code I can see the logstatements quite immediately:

>Create pdf ... DONE!
>Write pdf to output stream...
>Processed page 1
>Processed page 2
>Processed page 3
>Processed page 1
>Processed page 2
>Write pdf to output stream... DONE!

--> This takes about 200 milli seconds

The Problem is, that the time consumed until the PDF is finally
displayed in the browser is about 20 seconds! I test the application
locally (using Tomcat). The PDF produced is of size 200Kb.
I assume that there must be something like a timeout that takes place...

Have anybody ever had a similar problem? Any hints?
Any help is appreciated!

Many thanks
Silvio


----------------------8<------------------------------------------------
----
Code Snippet of Merging Class(CompoundDocument):
================================================

 public void writeTo(OutputStream inStream) throws
MyDocumentException {
  int i=0;
  Document lDocument = null;
  PdfCopy lWriter = null;
 
  for (Iterator lIterator = documents.iterator();
lIterator.hasNext();i++) {
   try {  
    //get content of actual delegated document
    MyDocument lMyDocument = (MyDocument)lIterator.next();
    ByteArrayOutputStream lStream = new ByteArrayOutputStream();
    //fixme (shd) here we could directly get the stream from the
document
    //instead of writing the whole data to a "tempstream" to be able
to read it
    lMyDocument.writeTo(lStream);
    PdfReader lReader = new PdfReader(lStream.toByteArray());    
   
    if (i == 0) {
      //create (single) target document instance
      lDocument = new Document(lReader.getPageSizeWithRotation(1));
      //we create writer to write into global stream
     lWriter = new PdfCopy(lDocument, inStream);
     //open target document instance
     lDocument.open();
    }
 
    //read in page by page
    int n = lReader.getNumberOfPages();
    for(int j = 1; j <= n; j++) {
      PdfImportedPage lPage = lWriter.getImportedPage(lReader, j);
      lWriter.addPage(lPage);
      cLogger.info("Processed page " + j);
      lWriter.flush();
    }
   
    lStream.flush();
    lStream.close();
    lWriter.flush();
   
   } catch (DocumentException ex) {
    cLogger.error("Error writing pdf to stream!", ex);
    throw new MyDocumentException(ex);
   
   } catch (IOException ex) {
    cLogger.error("Error writing pdf to stream!", ex);
    throw new MyDocumentException(ex);
   }
  }
 
  if (lWriter != null) {
   lWriter.close();
  }  
  if (lDocument != null) {
   lDocument.close();
  }
}



Servlet (Struts Action):
========================

public ActionForward execute(ActionMapping mapping,
                        ActionForm form,
                        HttpServletRequest request,
                        HttpServletResponse response) {

...
 MyDocument lCompoundDocument = new CompountDocument();
 //add some documents here
 
 //make sure each document itelfs write the pdf to its own byte output
stream

 try {
   cLogger.debug("Create pdf ... DONE!");
   //fill up response
   response.setContentType(CONTENT_TYPE_PDF);
   response.setContentLength(lDocument.size());
   response.setBufferSize(0);
   response.setHeader("Content-disposition", "inline;
filename=\"sample.pdf\"");
   response.setHeader("Cache-Control", "max-age=30");
   response.setHeader("Pragma", "no-cache");
   response.flushBuffer();
   cLogger.debug("Write pdf to output stream...");
   ServletOutputStream lStream = response.getOutputStream();

   lDocument.writeTo(lStream);  //see the method above

   lStream.flush();
   response.flushBuffer();
   cLogger.debug("Write pdf to output stream... DONE!");
   lStream.close();
  }
  catch (IOException ex)
  {
   throw new MyException(ex);
  }
  catch (Exception ex)
  {
   cLogger.error("Exception occured during creating a document", ex);
   throw new MyException(ex);
  }

 return null;
}



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