Andreas Lehmkühler created PDFBOX-5943:
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Summary: Extend interface ResourceCache to support the removal of
cached objects
Key: PDFBOX-5943
URL: https://issues.apache.org/jira/browse/PDFBOX-5943
Project: PDFBox
Issue Type: Improvement
Components: Parsing
Affects Versions: 3.0.4 PDFBox, 4.0.0
Reporter: Andreas Lehmkühler
Assignee: Andreas Lehmkühler
The interface {{org.apache.pdfbox.pdmodel.ResourceCache}} defines an api to be
used to cache the resources of a pdf while processing it. While is consists of
methods to add and get objects to/from the cache there aren't any to remove
them from the cache.
The resource cache is bound to the PDDocument so that the resources of a pdf
are collected during processing until the pdf is closed.
PDFBox has no chance to release those resources which are no longer needed. The
class which implemented the interface has no chance to know when a resources is
no longer needed and it is save to remove it from the cache.
The current default implementation uses SoftReferences and relies on the
garbage collector when it comes to release resources from the cache. This works
as long as enough memory is available and/or the object generating code isn't
faster than the garbage collector.
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