01: /*
02: This file is part of the PolePosition database benchmark
03: http://www.polepos.org
04:
05: This program is free software; you can redistribute it and/or
06: modify it under the terms of the GNU General Public License
07: as published by the Free Software Foundation; either version 2
08: of the License, or (at your option) any later version.
09:
10: This program is distributed in the hope that it will be useful,
11: but WITHOUT ANY WARRANTY; without even the implied warranty of
12: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13: GNU General Public License for more details.
14:
15: You should have received a copy of the GNU General Public
16: License along with this program; if not, write to the Free
17: Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
18: MA 02111-1307, USA. */
19:
20: package org.polepos.teams.db4o;
21:
22: import org.polepos.circuits.sepang.*;
23:
24: /**
25: * @author Herkules
26: */
27: public class SepangDb4o extends Db4oDriver implements SepangDriver {
28:
29: long treeRootID;
30: Tree lastRead;
31:
32: public void write() {
33: begin();
34: Tree tree = Tree.createTree(setup().getTreeDepth());
35: store(tree);
36: treeRootID = db().getID(tree);
37: commit();
38: }
39:
40: public void read() {
41: lastRead = readAndActivate();
42: Tree.traverse(lastRead, new TreeVisitor() {
43: public void visit(Tree tree) {
44: addToCheckSum(tree.getDepth());
45: }
46: });
47: }
48:
49: public void read_hot() {
50: read();
51: }
52:
53: public void delete() {
54: begin();
55: Tree tree = readAndActivate();
56: Tree.traverse(tree, new TreeVisitor() {
57: public void visit(Tree tree) {
58: db().delete(tree);
59: }
60: });
61: commit();
62: }
63:
64: private Tree readAndActivate() {
65: Tree tree = (Tree) db().getByID(treeRootID);
66: db().activate(tree, Integer.MAX_VALUE);
67: return tree;
68: }
69: }
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