Hello,
>From the FAQ about PDFBox being thread safe, it says one can have multiple
threads each accessing their own PDDocument object.
I have a question about this. Here's some pseudo Scala code I use to load a
document, find its children, then parse those children using a
PDFTextStriperByArea:
<code>
val pdf = PDDocument.load(new File("/path/to/pdf"), true)
val cos = pdf.getDocumentCatalog().getPages().getCOSObject()
val kids = cos.getDictionaryObject(COSName.KIDS).asInstanceOf[COSArray]
// some logic to iterate through the children by index i:
val kid: COSDictionary = kids.getObject(i)
// XXX
if (COSName.PAGE.equals(kid.getDictionaryObject(COSName.TYPE))) {
// definitely a kid. Process!
// ... set up the stripper, set up bounding boxes, etc ...
stripper.extractRegions(new PDPage(kid))
}
</code>
The thing is, at point XXX I want to send the 'kid' off to another thread
for asynchronous processing.
How would I go about getting a handle on the underlying file as loaded by
PDDocument?
Do I just instantiate a PDDocument in each async thread and get the i-th
kid then process it?
I've tried this, but get "Too many open files".
Also, for badly-packed PDF trees, cos.getDictionaryObject(COSName.KIDS)
would need to be recursively called, which blows the previous hack out of
the water.
Any good examples of how this can be done?
Thank you,
Juan
