Re: btree on disk

Hello Vadim;

I have been looking and experimenting with BFiler. So far, I have been able
to insert into BTree,
but I have not been able to write to disk. (the initially created file stays
at same size).

Best Regards,
-C.B

//
Configuration config = new Configuration(DOMParser.toDocument(
Xindice.DEFAULT_CONFIGURATION), false);

BTreeFiler btf = new BTreeFiler();

btf.setConfig(config);

File file = new File("c:\\");
btf.setLocation(file, "test");
btf.create();

// this works and does indeed inserts to the btree
for(int i=0; i<100000; i++)
{
   btf.addValue(new Value("hello"+i), i);
}

// this throws an exception saying page file not open.
btf.writeRecord(new Key("key"), new Value("val"));

btf.close();

On 7/5/07, Vadim Gritsenko <[email protected]> wrote:
>
> Cam Bazz wrote:
> > Hello Developers,
> >
> > I have been looking for a solid implementation of a Java BTree on disk
> > for the longest time. Could it be possible to use xindices btree on disk
> > seperately.
> > If so, where would be a good place to start. I have looked at the source
> > code, instantiated a new BTree and added values to it, but I got a null
> > pointer exception saying that the file was not opened.
>
> I don't think you can use BTree class directly. Take a look at BTreeFiler
> - that
> should be better fit. Once you instantiate it, you need to pass in
> configuration
> and open it. Once you are done working with it, it needs to be closed.
>
> See also org.apache.xindice.core.Collection, there you can see how to work
> with
> Filers.
>
> PS Have you seen JISP?
>
> Vadim
>
> [1] http://www.coyotegulch.com/products/jisp/
>