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From "Nick Burch (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TIKA-1308) Support in memory parse mode(don't create temp file): to support run Tika in GAE
Date Fri, 23 May 2014 16:10:03 GMT

    [ https://issues.apache.org/jira/browse/TIKA-1308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14007294#comment-14007294
] 

Nick Burch commented on TIKA-1308:
----------------------------------

Note that some parsers will always require a File to work, due to the API contract of the
upstream library used in parsing

> Support in memory parse mode(don't create temp file): to support run Tika in GAE
> --------------------------------------------------------------------------------
>
>                 Key: TIKA-1308
>                 URL: https://issues.apache.org/jira/browse/TIKA-1308
>             Project: Tika
>          Issue Type: Improvement
>          Components: parser
>    Affects Versions: 1.5
>            Reporter: yuanyun.cn
>              Labels: gae
>             Fix For: 1.6
>
>
> I am trying to use Tika in GAE and write a simple servlet to extract meta data info from
jpeg:
> String urlStr = req.getParameter("imageUrl");
> byte[] oldImageData = IOUtils.toByteArray(new URL(urlStr));
> ByteArrayInputStream bais = new ByteArrayInputStream(oldImageData);
> Metadata metadata = new Metadata();
> BodyContentHandler ch = new BodyContentHandler();
> AutoDetectParser parser = new AutoDetectParser();
> parser.parse(bais, ch, metadata, new ParseContext());
> bais.close();
> This fails with exception:
> Caused by: java.lang.SecurityException: Unable to create temporary file
> 	at java.io.File.createTempFile(File.java:1986)
> 	at org.apache.tika.io.TemporaryResources.createTemporaryFile(TemporaryResources.java:66)
> 	at org.apache.tika.io.TikaInputStream.getFile(TikaInputStream.java:533)
> 	at org.apache.tika.parser.jpeg.JpegParser.parse(JpegParser.java:56)
> 	at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:242
> Checked the code, in org.apache.tika.parser.jpeg.JpegParser.parse(InputStream, ContentHandler,
Metadata, ParseContext), it creates a temp file from the input stream.
> I can understand why tika create temp file from the stream: so tika can parse it multiple
times.
> But as GAE and other cloud servers are getting more popular, is it possible to avoid
create temp file: instead we can copy the origin stream to a byteArray stream, so tika can
also parse it multiple times.
> -- This will have a limit on the file size, as tika keeps the whole file in memory, but
this can make tika work in GAE and maybe other cloud server.
> We can add a parameter in parser.parse to indicate whether do in memory parse only.
>  



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