/**
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 Oct 1, 2010
*/
package com.bigdata.btree;
import java.io.Serializable;
/**
* A btree utilization report.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public class BTreeUtilizationReport implements IBTreeUtilizationReport,
Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private final int leafUtilization;
private final int nodeUtilization;
private final int totalUtilization;
public BTreeUtilizationReport(final IBTreeStatistics stats) {
final long nnodes = stats.getNodeCount();
final long nleaves = stats.getLeafCount();
final long nentries = stats.getEntryCount();
final long numNonRootNodes = nnodes + nleaves - 1;
final int branchingFactor = stats.getBranchingFactor();
/*
* Note: It is quite possible for the intermediate products in
* these formulae to exceed Integer.MAX_VALUE, which is why we
* need to cast to long. The result will always be in [0:100].
*/
nodeUtilization = (int) (nnodes == 0 ? 100 : (100L * numNonRootNodes)
/ (nnodes * (long) branchingFactor));
leafUtilization = (int) (nleaves == 0 ? 0 : (100L * nentries)
/ (nleaves * (long) branchingFactor));
totalUtilization = (nodeUtilization + leafUtilization) / 2;
}
public int getLeafUtilization() {
return leafUtilization;
}
public int getNodeUtilization() {
return nodeUtilization;
}
public int getTotalUtilization() {
return totalUtilization;
}
/**
* Human readable representation.
*/
public String toString() {
return super.toString() + //
"{leafUtil=" + leafUtilization+ //
",nodeUtil=" + nodeUtilization+ //
",totalUtil=" + totalUtilization+ //
"}";
}
}