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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4165) HunspellDictionary - AffixFile Reader closed, Dictionary Readers left unclosed
Date Tue, 26 Jun 2012 13:41:44 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13401386#comment-13401386
] 

Uwe Schindler commented on LUCENE-4165:
---------------------------------------

-1, don't close InputStreams. We do this *nowhere* in Lucene.

bq. You said: "This is done everywhere that way." - hm what do you mean with everywhere? Usually
at least i do close all my readers which i did create.

I am talking about libraries. Of course the end user code closes the underlying stream. And
with the filter-reader contract you are wrong. Reader's and InputStream are a Decorator-Pattern
API. The close() call of the wrapper just delegates down, but there is no must to call it.

bq. Whats the problem with calling close on that readers and tell the caller that the stream
is consumed and closed?

See my example with ZIPInputStream. If you close the Reader on top, it will close the ZIPInputStream.
You have no chance to read the next ZIP-file entry. There are more examples like this.

The design of the Lucene TokenStream API also follows the decorator pattern, the same applies
for this one.
                
> HunspellDictionary - AffixFile Reader closed, Dictionary Readers left unclosed
> ------------------------------------------------------------------------------
>
>                 Key: LUCENE-4165
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4165
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: modules/analysis
>    Affects Versions: 3.6
>         Environment: Linux, Java 1.6
>            Reporter: Torsten Krah
>            Priority: Minor
>         Attachments: lucene_36.patch, lucene_trunk.patch
>
>
> The HunspellDictionary takes an InputStream for affix file and a List of Streams for
dictionaries.
> Javadoc is not clear about i have to close those stream myself or the Dictionary constructor
does this already.
> Looking at the code, at least reader.close() is called when the affix file is read via
readAffixFile() method (although closing streams is not done in a finally block - so the constructor
may fail to do so).
> The readDictionaryFile() method does miss the call to close the reader in contrast to
readAffixFile().
> So the question here is - have i have to close the streams myself after instantiating
the dictionary?
> Or is the close call only missing for the dictionary streams?
> Either way, please add the close calls in a safe manner or clarify javadoc so i have
to do this myself.

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