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.internal.cs;
22:
23: import com.db4o.foundation.*;
24: import com.db4o.internal.*;
25: import com.db4o.internal.cs.messages.*;
26:
27: /**
28: * @exclude
29: */
30: public class ClientHeartbeat implements Runnable {
31:
32: private SimpleTimer _timer;
33:
34: private final ClientObjectContainer _container;
35:
36: public ClientHeartbeat(ClientObjectContainer container) {
37: _container = container;
38: _timer = new SimpleTimer(this ,
39: frequency(container.configImpl()),
40: "db4o client heartbeat");
41: }
42:
43: private int frequency(Config4Impl config) {
44: return Math.min(config.timeoutClientSocket(), config
45: .timeoutServerSocket()) / 2;
46: }
47:
48: public void run() {
49: _container.writeMessageToSocket(Msg.PING);
50: }
51:
52: public void start() {
53: _timer.start();
54: }
55:
56: public void stop() {
57: if (_timer == null) {
58: return;
59: }
60: _timer.stop();
61: _timer = null;
62: }
63:
64: }
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