/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on May 8, 2007
*/
package com.bigdata.btree;
/**
* An interface for a counter. Mutable btrees expose mutable counters while
* read-only btrees do not. Like the mutable {@link BTree}, the mutable counter
* is NOT thread-safe. An unpartitioned index exposes a single counter for the
* entire index. A partitioned index exposes a counter per index partition and
* the partition identified forms the high int32 for the counter.
*
* @see IIndex#getCounter()
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public interface ICounter {
/**
* The current value of the counter (initially zero).
*/
public long get();
/**
* Increment the current value of the counter and then return its value
* (atomic).
*/
public long incrementAndGet();
}