/*
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 Mar 13, 2008
*/
package com.bigdata.counters;
/**
* Interface used to construct a counter that reports on an instrumented value.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public interface IInstrument<T> {
/** Obtain a sample. */
public T getValue();
/** Obtain the timestamp for the last collected sample. */
public long lastModified();
/**
* Set the current value.
*
* @param value
* The sampled value.
* @param timestamp
* The timestamp for that sample.
*
* @throws UnsupportedOperationException
* if this operation is not allowed.
*/
public void setValue(T value,long timestamp);
}