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;
22:
23: import com.db4o.*;
24: import com.db4o.test.types.*;
25:
26: public class GarbageCollection {
27: public static void main(String[] args) {
28: new java.io.File("tgc.yap").delete();
29:
30: int strSize = 1;
31: int objectCount = 10000;
32: ObjectContainer con = Db4o.openFile("tgc.yap");
33: String longString = "String";
34: ObjectSimplePublic osp = null;
35: ArrayTypedPublic atp = null;
36: for (int i = 0; i < strSize; i++) {
37: longString = longString + longString;
38: }
39: int toGetTen = objectCount / 10;
40: for (int i = 0; i < objectCount; i++) {
41:
42: /*
43: osp = new ObjectSimplePublic(longString);
44: con.set(osp);
45: con.deactivate(osp, 5);
46: */
47:
48: atp = new ArrayTypedPublic();
49: atp.set(1);
50: con.set(atp);
51:
52: if ((((double) i / toGetTen) - (i / toGetTen)) < 0.000001) {
53: con.commit();
54: con.ext().purge();
55: mem();
56: }
57:
58: }
59: con.commit();
60: con.ext().purge();
61: longString = null;
62: osp = null;
63: mem();
64: mem();
65: con.close();
66: }
67:
68: static void mem() {
69: System.runFinalization();
70: Runtime r = Runtime.getRuntime();
71: r.gc();
72: r.runFinalization();
73: r.gc();
74: System.out.println(r.totalMemory() - r.freeMemory());
75: }
76:
77: }
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