|
132
|
1 /*******************************************************************************
|
|
|
2
|
|
|
3 copyright: Copyright (c) 2004 Kris Bell. All rights reserved
|
|
|
4
|
|
|
5 license: BSD style: $(LICENSE)
|
|
|
6
|
|
|
7 version: July 2004: Initial release
|
|
|
8
|
|
|
9 author: Kris
|
|
|
10
|
|
|
11 *******************************************************************************/
|
|
|
12
|
|
|
13 module tango.net.cluster.tina.RollCall;
|
|
|
14
|
|
|
15 private import tango.net.cluster.NetworkMessage;
|
|
|
16
|
|
|
17 /******************************************************************************
|
|
|
18
|
|
|
19 An IMessage used by the cluster client and server during discovery
|
|
|
20 lookup and liveness broadcasts. The client broadcasts one of these
|
|
|
21 at startup to see which servers are alive. The server responds with
|
|
|
22 a reply RollCall stating its name and port. The server will also
|
|
|
23 broadcast one of these when it first starts, such that any running
|
|
|
24 clients can tell the server has 'recovered'.
|
|
|
25
|
|
|
26 Requests and responses are distinguished by the content of the msg:
|
|
|
27 a type value of Request indicates a request from a client and other
|
|
|
28 values are considered to be responses from servers.
|
|
|
29
|
|
|
30 ******************************************************************************/
|
|
|
31
|
|
|
32 class RollCall : NetworkMessage
|
|
|
33 {
|
|
|
34 enum {Request, Cache, Queue, Task}
|
|
|
35
|
|
|
36 char[] addr; // server name & port pair
|
|
|
37 uint type; // request, cache, queue, or task server?
|
|
|
38
|
|
|
39 /**********************************************************************
|
|
|
40
|
|
|
41 A request from a client
|
|
|
42
|
|
|
43 **********************************************************************/
|
|
|
44
|
|
|
45 this ()
|
|
|
46 {
|
|
|
47 }
|
|
|
48
|
|
|
49 /**********************************************************************
|
|
|
50
|
|
|
51 Response from a server
|
|
|
52
|
|
|
53 **********************************************************************/
|
|
|
54
|
|
|
55 this (int type)
|
|
|
56 {
|
|
|
57 this.type = type;
|
|
|
58 }
|
|
|
59
|
|
|
60 /**********************************************************************
|
|
|
61
|
|
|
62 Freeze the content
|
|
|
63
|
|
|
64 **********************************************************************/
|
|
|
65
|
|
|
66 void read (IReader input)
|
|
|
67 {
|
|
|
68 super.read (input);
|
|
|
69 input (addr) (type);
|
|
|
70 }
|
|
|
71
|
|
|
72 /**********************************************************************
|
|
|
73
|
|
|
74 Defrost the content
|
|
|
75
|
|
|
76 **********************************************************************/
|
|
|
77
|
|
|
78 void write (IWriter output)
|
|
|
79 {
|
|
|
80 super.write (output);
|
|
|
81 output (addr) (type);
|
|
|
82 }
|
|
|
83 }
|
|
|
84
|
|
|
85
|
