Re: [Podofo-users] Thought on "object garbage collection"

[Dominik S. <dom...@we...>]

Reading stream objects but not their bytes should work already.=20

I do not want to load all objects immediately, to construct such a table wh=
ile=20
loading. This would drive the load on demand functionallity we currently ha=
ve=20
useless.=20

As the garbage collection of objects will only occur before writing the=20
objects, it is no problem to load all objects at that point of time. We hav=
e=20
to load them for writing anyways. We would have to walk through all objects=
=20
though in this case, as we cannot create the table entry during PdfReferenc=
e=20
construction.

So we have to find out which is the bigger advantage: Either build a garbag=
e=20
collection table when loading the document or support loading on demand of=
=20
objects and have a slower garbage collection when writing. I prefer support=
=20
for loading of demand of objects, as this should give better performance an=
d=20
will be more often used than garbage collection of objects.

best regards,
	Dom

Am Wednesday, 30. August 2006 04:04 schrieb Leonard Rosenthol:
> Since ANY/ALL "references" to indirect objects MUST go through
> PdfReference objects - if we were to keep a table of all objects that
> are referenced (and perhaps a count), then we could easily find out
> what objects are (and are not) referenced!
>
> We might have to load all objects in order to do so, since we won't
> have created refs for not-yet-loaded objects...This would, however,
> be a good excuse to support loading a Stream object w/o actually
> reading the stream bytes - separating that operation.
>
> There may be a flaw in this - haven't worked it 100% yet...but it
> seems good on the surface...
>
> LDR
>
> -------------------------------------------------------------------------=
=2D-
> Leonard Rosenthol                            <mailto:leo...@pd...=
m>
> Chief Technical Officer                      <http://www.pdfsages.com>
> PDF Sages, Inc.                              215-938-7080 (voice)
>                                               215-938-0880 (fax)
>
>
> -------------------------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job
> easier Download IBM WebSphere Application Server v.1.0.1 based on Apache
> Geronimo
> http://sel.as-us.falkag.net/sel?cmd=3Dlnk&kid=3D120709&bid=3D263057&dat=
=3D121642
> _______________________________________________
> Podofo-users mailing list
> Pod...@li...
> https://lists.sourceforge.net/lists/listinfo/podofo-users

=2D-=20
**********************************************************************
Dominik Seichter - dom...@we...
KRename  - http://www.krename.net  - Powerful batch renamer for KDE
KBarcode - http://www.kbarcode.net - Barcode and label printing
PoDoFo - http://podofo.sf.net - PDF generation and parsing library
SchafKopf - http://schafkopf.berlios.de - Schafkopf, a card game,  for KDE
Alan - http://alan.sf.net - A Turing Machine in Java
**********************************************************************