01: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
02:
03: This file is part of the db4o open source object database.
04:
05: db4o is free software; you can redistribute it and/or modify it under
06: the terms of version 2 of the GNU General Public License as published
07: by the Free Software Foundation and as clarified by db4objects' GPL
08: interpretation policy, available at
09: http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10: Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11: Suite 350, San Mateo, CA 94403, USA.
12:
13: db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14: WARRANTY; without even the implied warranty of MERCHANTABILITY or
15: FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16: for more details.
17:
18: You should have received a copy of the GNU General Public License along
19: with this program; if not, write to the Free Software Foundation, Inc.,
20: 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21: package com.db4o.test.tuning;
22:
23: import com.db4o.*;
24: import com.db4o.query.*;
25: import com.db4o.test.*;
26:
27: /**
28: * Original performance on the server:
29: * Querying 10000 objects for member identity: 640ms
30: *
31: * Original performance on Carls machine with Skype on:
32: * Querying 10000 objects for member identity: 703ms
33: *
34: * Result after enabling member indices:
35: * Querying time too small to measure.
36: */
37:
38: public class TuningIdentityQuery {
39:
40: static final int COUNT = 10000;
41:
42: TIMember member;
43:
44: public TuningIdentityQuery() {
45: }
46:
47: public TuningIdentityQuery(TIMember member) {
48: this .member = member;
49: }
50:
51: public void configure() {
52: Db4o.configure().objectClass(this ).objectField("member")
53: .indexed(true);
54: }
55:
56: public void store() {
57: for (int i = 0; i < COUNT; i++) {
58: Test.store(new TuningIdentityQuery(new TIMember("" + i)));
59: }
60: }
61:
62: public void test() {
63: Query q = Test.query();
64: q.constrain(TIMember.class);
65: ObjectSet objectSet = q.execute();
66: TIMember member = (TIMember) objectSet.next();
67: q = Test.query();
68: q.constrain(TuningIdentityQuery.class);
69: q.descend("member").constrain(member).identity();
70:
71: long start = System.currentTimeMillis();
72: objectSet = q.execute();
73:
74: long stop = System.currentTimeMillis();
75:
76: Test.ensure(objectSet.size() == 1);
77: TuningIdentityQuery ti = (TuningIdentityQuery) objectSet.next();
78: Test.ensure(ti.member == member);
79:
80: long duration = stop - start;
81: System.out.println("Querying " + COUNT
82: + " objects for member identity: " + duration + "ms");
83: }
84:
85: public static class TIMember {
86:
87: String name;
88:
89: public TIMember() {
90:
91: }
92:
93: public TIMember(String name) {
94: this.name = name;
95: }
96:
97: }
98:
99: }
|