PDF transcoder performance

[Jan Tosovsky <j....@tiscali.cz>]

Dear All,

in my project I need to convert 2 svg files into a single PDF file.

1) The first approach was to wrap SVG files by FO code and generate the PDF
output via Apache FOP. It works fine, but recently I've found that FOP is
somehow leaking and does not release objects properly so this solution ends
very quickly with heap space memory errors.

2) The second approach was to use Batik's PDF transcoder to produce two
separate single page PDF files and merge them using the Apache PDFBox
library.

Unfortunately, this solution is very slow, especially the Transcoder's
transcode method:

private static byte[] getPDFByteArray(InputStream svgStream) throws
Exception {
   Transcoder t = new PDFTranscoder();
   TranscoderInput input = new TranscoderInput(svgStream);

   ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
   BufferedOutputStream outputBuff = new BufferedOutputStream(outputStream);
   TranscoderOutput output = new TranscoderOutput(outputBuff);
   t.transcode(input, output);

   return outputStream.toByteArray();
}

While the first approach needs approx 2 seconds to complete the task (SVG
files are quite complex), the second solution takes approx 8 seconds on my
computer (transcode method itself 7 seconds).

Does anybody have any hint how to improve the performance of my code? Are
there any secret speed up switches?

Thanks,

Jan


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Re: PDF transcoder performance

[Johan Stuyts <j....@javathinker.com>]

>    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
>    BufferedOutputStream outputBuff = new  
> BufferedOutputStream(outputStream);

There is no performance gain in buffering an in-memory output stream. You  
will likely see a tiny decrease in performance instead.

I am pretty sure that you won't notice any difference, but what you can  
try is to start with a bigger buffer size (e.g. 1 MB) to prevent some  
copying of the data as it grows:
<http://docs.oracle.com/javase/6/docs/api/java/io/ByteArrayOutputStream.html#ByteArrayOutputStream(int)>

Regards,

Johan

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Re: PDF transcoder performance

[amey <am...@citiustech.com>]

Hi Jane,
Can you tell me how you are able to generate single pdf using two or more
svgs?



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