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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) 2011
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/>.
*/
/**
* Page file statistic utility functions.
*
* @author Erich Schubert
*
* @apiviz.landmark
*
* @apiviz.uses PageFileStatistics oneway - - analyses
*/
public final class PageFileUtil {
/**
* Append the page file statistics to the output buffer.
*
* @param buffer Buffer to append to
*/
public static void appendPageFileStatistics(StringBuffer buffer, PageFileStatistics statistics) {
if(statistics != null) {
buffer.append("Page File Layer: ").append(statistics.getClass()).append("\n");
buffer.append("Read Operations: ").append(statistics.getReadOperations()).append("\n");
buffer.append("Write Operations: ").append(statistics.getWriteOperations()).append("\n");
PageFileStatistics inner = statistics.getInnerStatistics();
if(inner != null) {
appendPageFileStatistics(buffer, inner);
}
}
}
/**
* Get the number of (logical) read operations (without caching).
*
* @param statistics Statistics.
* @return logical read operations.
*/
public static long getLogicalReadOperations(PageFileStatistics statistics) {
return statistics.getReadOperations();
}
/**
* Get the number of (logical) write operations (without caching).
*
* @param statistics Statistics.
* @return logical write operations.
*/
public static long getLogicalWriteOperations(PageFileStatistics statistics) {
return statistics.getWriteOperations();
}
/**
* Get the number of (physical) read operations (with caching).
*
* @param statistics Statistics.
* @return physical read operations.
*/
public static long getPhysicalReadOperations(PageFileStatistics statistics) {
PageFileStatistics inner = statistics.getInnerStatistics();
if(inner != null) {
return getPhysicalReadOperations(inner);
}
return statistics.getReadOperations();
}
/**
* Get the number of (physical) write operations (with caching).
*
* @param statistics Statistics.
* @return physical write operations.
*/
public static long getPhysicalWriteOperations(PageFileStatistics statistics) {
PageFileStatistics inner = statistics.getInnerStatistics();
if(inner != null) {
return getPhysicalWriteOperations(inner);
}
return statistics.getWriteOperations();
}
}
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