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https://issues.apache.org/jira/browse/PDFBOX-5943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andreas Lehmkühler resolved PDFBOX-5943.
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Resolution: Fixed
> 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
> Priority: Major
> Fix For: 3.0.5 PDFBox, 4.0.0
>
>
> 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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