1 package org.mortbay.cometd.ext;
2
3 import java.util.Map;
4
5 import org.cometd.Bayeux;
6 import org.cometd.Client;
7 import org.cometd.Extension;
8 import org.cometd.Message;
9 import org.mortbay.cometd.ClientImpl;
10 import org.mortbay.log.Log;
11 import org.mortbay.util.ajax.JSON;
12
13
14
15
16
17
18
19
20
21
22
23
24 public class AcknowledgedMessagesExtension implements Extension
25 {
26 JSON.Literal _replyExt = new JSON.Literal("{\"ack\":true}");
27
28 public Message rcv(Client from, Message message)
29 {
30 return message;
31 }
32
33 public Message rcvMeta(Client from, Message message)
34 {
35 return message;
36 }
37
38 public Message send(Client from, Message message)
39 {
40 return message;
41 }
42
43 public Message sendMeta(Client from, Message message)
44 {
45 if (message.getChannel().equals(Bayeux.META_HANDSHAKE) && Boolean.TRUE.equals(message.get(Bayeux.SUCCESSFUL_FIELD)))
46 {
47 Message rcv = message.getAssociated();
48
49 Map<String, Object> ext = rcv.getExt(false);
50 boolean clientRequestedAcks = ext != null && ext.get("ack")==Boolean.TRUE;
51
52 if (clientRequestedAcks && from!=null) {
53 Log.info("Enabled message acknowledgement for client " + from);
54 from.addExtension(new AcknowledgedMessagesClientExtension(from));
55 ((ClientImpl)from).setMetaConnectDeliveryOnly(true);
56 }
57
58 message.put(Bayeux.EXT_FIELD, _replyExt);
59 }
60
61 return message;
62 }
63
64 }