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Java > Open Source Codes > com > db4o > test > GarbageCollection


1 /* Copyright (C) 2004 - 2006 db4objects Inc. http://www.db4o.com
2
3 This file is part of the db4o open source object database.
4
5 db4o is free software; you can redistribute it and/or modify it under
6 the terms of version 2 of the GNU General Public License as published
7 by the Free Software Foundation and as clarified by db4objects' GPL
8 interpretation policy, available at
9 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 {
28     public static void main(String JavaDoc[] args){
29         new java.io.File JavaDoc("tgc.yap").delete();
30
31         int strSize = 1;
32         int objectCount = 10000;
33         ObjectContainer con = Db4o.openFile("tgc.yap");
34         String JavaDoc longString = "String";
35         ObjectSimplePublic osp = null;
36         ArrayTypedPublic atp = null;
37         for(int i = 0; i < strSize; i++){
38             longString = longString + longString;
39         }
40         int toGetTen = objectCount / 10;
41         for(int i = 0; i < objectCount; i++){
42
43             /*
44             osp = new ObjectSimplePublic(longString);
45             con.set(osp);
46             con.deactivate(osp, 5);
47             */
48
49             atp = new ArrayTypedPublic();
50             atp.set(1);
51             con.set(atp);
52
53             if( (((double)i / toGetTen) - (i / toGetTen)) < 0.000001){
54                 con.commit();
55                 con.ext().purge();
56                 mem();
57             }
58             
59         }
60         con.commit();
61         con.ext().purge();
62         longString = null;
63         osp = null;
64         mem();
65         mem();
66         con.close();
67     }
68
69      static void mem() {
70         System.runFinalization();
71          Runtime JavaDoc r = Runtime.getRuntime();
72          r.gc();
73          r.runFinalization();
74          r.gc();
75          System.out.println(r.totalMemory() - r.freeMemory());
76      }
77
78 }
79
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