the question is like this：
when one user is using IndexWirter.addDocument(doc), and another user has
already finished adding part and have closed IndexWirter, then, the first
user embraces the error "ERROR: this IndexWriter is closed", cause both of
them creat the IndexWriter based on RAM by the same sever.
I followed the error to the lucene source, there is ensureOpen(); in
IndexWirter.addDocument( ), and the error is there,
protected synchronized final void ensureOpen(boolean includePendingClose)
throws AlreadyClosedException {
if (!isOpen(includePendingClose)) {
throw new AlreadyClosedException("this IndexWriter is closed");
}
}
how to avoid these kind of error? could lucene check this kind of sitation
by itself?
2010/8/17 xiaoyan Zheng <hillyzh...@gmail.com>
>
> about RAMDirectory based B/S plantform problem
>
> hello, I just start to use lucene and become confused about RAMDirectory
> based lucene index establishment, the problem is one user use this RAM to
> establish index is ok, but, when it comes to multi user, the results is not
> correct. when i use synchronized{ writer.writeIndex (...)}, all go alright.
> but users have to wait. i mean, is that RAM can only be used in single
> thread, esp. writing the index? how to solve it in a B/S plantform?
>
> ============================
> the detailed test code is like these, very simple, just use jsp:
>
>
> RAMDirectory idx=new RAMDirectory();
>
> LuceneIndexWriterImpl writer=null;
> writer=LuceneIndexWriterImpl.getInstance();
>
> //RAM-based lucene index establishment
>
> synchronized(wirter){
> //if no synchronized the result is not correct
> writer.writeIndex(idx);
>
> }
>
> LuceneIndexReaderImpl luceneReader=new LuceneIndexReaderImpl(idx);
> ....
> ....
>
> out.println("****");
> for(Integer id :documents.keySet())
> out.println(id);
> out.println("****");
>
> ===========================
> result:
> if only one user: out put is correct 7,3
>
> but two users(if no synchronized): out put may be 0,0 and 4, 0 or other
> unexpected result.
>
>
> Regards
> Hilly
>
