[LUCENE-151] [PATCH] Clonable RAMDirectory

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Not A Problem
• Component/s: core/store

Environment

Operating System: other
Platform: Other

• Bugzilla Id: 23774
• Assignee: Unassigned
• Reporter: Otis Gospodnetic
• Created: 13/Oct/03 20:39
• Updated: 28/Aug/22 11:14
• Resolved: 25/Jan/11 16:30

Description

A patch for RAMDirectory that makes it clonable.

May 22nd, 2003 contribution from "Nick Smith" <[e-mail]>

Original email:
Hi Lucene Developers,
Thanks for a great product!

I need to be able to 'snapshot' our in-memory indices (RAMDirectory
instances).

I have been using :

RAMDirectory activeDir = new RAMDirectory();
// many inserts, deletes etc
RAMDirectory cloneDir = new RAMDirectory(activeDir);

but unfortunately this is rather slow for large indices.

I have a suggestion - implement java.lang.Cloneable interface
in RAMDirectory. I.e to be able to call :

RAMDirectory cloneDir = (RAMDirectory)activeDir.clone();

This bypasses the input/output stream handling of the
copy constructor by cloneing the underlying buffers that
form the directory and is much faster. (Diff attached).

Any comments?

Regards,

Nick