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package de.lmu.ifi.dbs.elki.persistent;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2012
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Statistics API for a Page File.
*
* See {@link PageFileUtil} for related utility functions for analysing this
* data!
*
* @author Erich Schubert
*/
public interface PageFileStatistics {
/**
* Returns the read I/O-Accesses of this file.
*
* @return Number of physical read I/O accesses
*/
public long getReadOperations();
/**
* Returns the write I/O-Accesses of this file.
*
* @return Number of physical write I/O accesses
*/
public long getWriteOperations();
/**
* Resets the counters for page accesses of this file and flushes the cache.
*/
public void resetPageAccess();
/**
* Get statistics for the inner page file, if present.
*
* @return Inner page file statistics, or null.
*/
public PageFileStatistics getInnerStatistics();
}
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