[pylucene-dev] pylucene and pylons

[John Beaver]

Hah, sounds like an rtfm. Thanks - that fixed it.

For others, I put the lucene.initVM(lucene.CLASSPATH) call in 
middleware.py, and then just called getVMEnv().attachCurrentThread() in 
the controller before using any PyLucene functions.



Andi Vajda wrote:
>
> On Apr 11, 2008, at 8:47, John Beaver <john.e.beaver at gmail.com> wrote:
>
>> Hi, I'm trying to integrate PyLucene with a Pylons app, but I'm 
>> having serious stability problems. Does anyone have experience with 
>> this?
>>
>> Specifically, I have a single action which does the following:
>>
>> lucene.initVM(lucene.CLASSPATH)
>> directory = FSDirectory.getDirectory(Globals.LUCENE_INDEX_PATH);
>> searcher = IndexSearcher(directory)
>> analyzer = StandardAnalyzer()
>> query = QueryParser('terms', analyzer).parse(term)
>> hits = searcher.search(query)
>> ... process hits
>>
>> It works perfectly the first time I view the corresponding webpage, 
>> but it reproducibly crashes the webserver (paster serve) the second 
>> time I try, always while in the initVM() function.
>>
>> I've tried putting the initVM() call in middleware.py, and I've tried 
>> using a global flag to make sure that initVM() is only called once in 
>> the controller. Both seem to fail when a different thread tries to 
>> access PyLucene functions.
>>
>> I'm assuming this is a threading issue, so I'm going to write some 
>> code to ensure that everything happens within a single thread. But 
>> does anyone have a simpler solution for getting this working within 
>> Pylons?
>
> initVM() should be called from the main thread. Calling it more than 
> once, in recent versions, is a nop.
>
> Any other thread requiring JVM access needs to first call 
> env.attachCurrentThread() or the process will crash. See README for 
> PyLucene and JCC for more info.
>
> Andi..
>
>
>>
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