Michael McCandless wrote:
Ruslan Sivak wrote:
Michael McCandless wrote:
Ruslan Sivak wrote:
Since my app would be multithreaded, there could be multiple
threads accessing the reader, while i'm reloading it. This means
that if I close the reader, and another thread is using it, it
might get an exception.
The normal approach here is open a new reader, start sending new
searches to the new reader, and only once all existing searches
(and, possibly, search sessions, if for example you want paginating
through results to not suddenly change on the user) are done with
the old reader do you close the old one.
How exactly would I do something like this? I'm not sure where to
start. From what I understand, the reader will be auto closed when
there are no more references to it. What if I did somehting like this
Private IndexReader reader;
public IndexReader getReader()
{
if (we are reloading)
{
Directory dir = new RAMDirectory (indexName);
reader = IndexReader.open(dir);
}
return reader;
}
public Results search(String searchTerms)
{
IndexReader r=getReader()
//Do search and return results
}
This should work, right? The local variable will hold a reference to
a reader that it's using, and once it goes out of use, it should auto
close, correct? Is closing the reader even necessary? Won't it just
get collected by the GC once there are no more references to it?
Well you could keep a counter of how many searches are presently using
the previous reader, and then the final search to finish with the
previous reader would close it?
GC doesn't actually "close" the reader, though since you're using
RAMDirectory, you're not actually consuming any file descriptors so I
think it might be OK for you to never close and simply replace your
reader with the newly reopened one? Normally this is not recommended,
ie, a reader against an FSDirectory uses up precious file descriptors...
Mike
What about using something like decref? Does anyone know the proper way
to use it? From the docs:
decRef
protected void *decRef*()
throws IOException
<http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html>
Decreases the refCount of this IndexReader instance. If the refCount
drops to 0, then pending changes are committed to the index and this
reader is closed.
Russ
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