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From "Jonathan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PDFBOX-4539) Cache CharsetDecoder
Date Thu, 09 May 2019 12:46:00 GMT

     [ https://issues.apache.org/jira/browse/PDFBOX-4539?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan updated PDFBOX-4539:
-----------------------------
    Priority: Minor  (was: Major)

> Cache CharsetDecoder
> --------------------
>
>                 Key: PDFBOX-4539
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4539
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: Parsing
>    Affects Versions: 2.0.14
>            Reporter: Jonathan
>            Priority: Minor
>              Labels: performance
>             Fix For: 2.0.16
>
>
> We were using PDFBox to parse and process a large number of PDFs, which could potentially
contains thousands of pages in total, so performance mattered to us.
> Thus, we'd like to suggest to cache the CharsetDecoder, which is currently instantiated
on each call of `isValidUTF8(byte[])`.
> Our suggestion in BaseParser.java
> {code:java}
> private static final CharsetDecoder csUTF_8 = Charsets.UTF_8.newDecoder();
> /**
>  * Returns true if a byte sequence is valid UTF-8.
>  */
> private boolean isValidUTF8(byte[] input)
> {
>     try
>     {
>         csUTF_8.decode(ByteBuffer.wrap(input));
>         return true;
>     }
>     catch (CharacterCodingException e)
>     {
>         return false;
>     }
> }
> {code}
>  



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