/* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
This file is part of the db4o open source object database.
db4o is free software; you can redistribute it and/or modify it under
the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation and as clarified by db4objects' GPL
interpretation policy, available at
http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
Suite 350, San Mateo, CA 94403, USA.
db4o 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. */
package com.db4o.test;
import java.io.*;
import com.db4o.*;
import com.db4o.query.*;
/**
*
*/
public class MaxSize {
public String index;
private static final int SIZE = 1000000;
private static final int COMMIT_INTERVAL = 10000;
private static final int QUERIES = 1000;
private static final String FILE = "maxSize.yap";
public static void main(String[] args) {
// make sure there is an index on the "index" field
Db4o.configure().objectClass(MaxSize.class).objectField("index").indexed(true);
store();
query();
}
public MaxSize() {
}
public MaxSize(String index) {
this.index = index;
}
public static void store() {
new File(FILE).delete();
ObjectContainer objectContainer = Db4o.openFile(FILE);
long start = System.currentTimeMillis();
long elapsed;
for (int i = 1; i <= SIZE; i++) {
objectContainer.set(new MaxSize("" + i));
if (((double) i / (double) COMMIT_INTERVAL) == i / COMMIT_INTERVAL) {
objectContainer.commit();
objectContainer.ext().purge();
elapsed = System.currentTimeMillis() - start;
System.out.println("Committed " + i + " from " + SIZE + " elapsed " + elapsed + "ms");
}
}
objectContainer.close();
elapsed = System.currentTimeMillis() - start;
System.out.println("\nTime to store " + SIZE + " objects:\n" + elapsed + "ms");
}
public static void query() {
ObjectContainer objectContainer = Db4o.openFile(FILE);
long time = System.currentTimeMillis();
for (int i = 1; i <= QUERIES; i++) {
Query q = objectContainer.query();
q.constrain(MaxSize.class);
q.descend("index").constrain("" + i);
q.execute();
}
time = System.currentTimeMillis() - time;
objectContainer.close();
System.out.println("\nTime for " + QUERIES + " queries against an indexed field in " + SIZE + " objects:\n" + time + "ms");
double perQuery = (double)time / (double)1000;
System.out.println("\nTime per query:\n" + perQuery + "ms");
int perSecond = (int)((double)1000 / perQuery);
System.out.println("\nQueries per second:\n" + perSecond);
}
}
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