1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// gateway
//
// = FILENAME
// Event.h
//
// = AUTHOR
// Doug Schmidt
//
// ============================================================================
#if !defined (EVENT_H)
#define EVENT_H
#include "ace/OS.h"
// = The following #defines should really be in a separate include
// file that is shared with the ../Peer/ directory. For now, we'll
// keep them here to simplify the sharing between the two directories.
// BTW, this is also the reason why all the methods are inlined...
// Used by Peers to create Consumers in a Gateway.
#if !defined (DEFAULT_GATEWAY_CONSUMER_PORT)
#define DEFAULT_GATEWAY_CONSUMER_PORT 10009
#endif /* DEFAULT_GATEWAY_CONSUMER_PORT */
// Used by Peers create Suppliers in a Gateway.
#if !defined (DEFAULT_GATEWAY_SUPPLIER_PORT)
#define DEFAULT_GATEWAY_SUPPLIER_PORT 10010
#endif /* DEFAULT_GATEWAY_SUPPLIER_PORT */
// Used by a Gateway to create Consumers in a Peer.
#if !defined (DEFAULT_PEER_CONSUMER_PORT)
#define DEFAULT_PEER_CONSUMER_PORT 10011
#endif /* DEFAULT_PEER_CONSUMER_PORT */
// Used by a Gateway to create Suppliers in a Peer.
#if !defined (DEFAULT_PEER_SUPPLIER_PORT)
#define DEFAULT_PEER_SUPPLIER_PORT 10012
#endif /* DEFAULT_PEER_SUPPLIER_PORT */
#if !defined (MAX_CONSUMERS)
#define MAX_CONSUMERS 1000
#endif /* MAX_CONSUMERS */
// This is the unique supplier identifier that denotes a particular
// <Connection_Handler> in the Gateway.
typedef ACE_INT32 CONNECTION_ID;
enum
{
// = These are the types of events generated by the <Suppliers> and
// handled by the <Event_Channel>.
ROUTING_EVENT = 0,
// A normal event, which is forwarded to the <Consumers>.
SUBSCRIPTION_EVENT = 1
// A subscription to <Suppliers> managed by the <Event_Channel>.
};
class Event_Key
{
// = TITLE
// Address used to identify the source/destination of an event.
//
// = DESCRIPTION
// This is really a "processing descriptor" that is used to
// decouple the processing, filtering, and forwarding logic of
// the Event Channel from the format of the data. The
// <connection_id_> and <type_> fields are copied from the
// <Event_Header> class below.
public:
Event_Key (CONNECTION_ID cid = -1,
ACE_INT32 type = 0,
ACE_INT32 priority = 0)
: connection_id_ (cid),
type_ (type),
priority_ (priority)
{
}
int operator== (const Event_Key &event_addr) const
{
return this->connection_id_ == event_addr.connection_id_
&& this->type_ == event_addr.type_;
}
CONNECTION_ID connection_id_;
// Unique connection identifier that denotes a particular
// Connection_Handler.
ACE_INT32 type_;
// Event type, e.g., <ROUTING_EVENT> or <SUBSCRIPTION_EVENT>.
ACE_INT32 priority_;
// Event priority.
};
class Event_Header
{
// = TITLE
// Fixed sized header.
//
// = DESCRIPTION
// This is designed to have a sizeof (16) to avoid alignment
// problems on most platforms.
public:
enum
{
INVALID_ID = -1 // No peer can validly use this number.
};
Event_Header (ACE_INT32 len,
CONNECTION_ID connection_id,
ACE_INT32 type,
ACE_INT32 priority)
: len_ (len),
connection_id_ (connection_id),
type_ (type),
priority_ (priority)
{
}
void decode (void)
{
this->len_ = ntohl (this->len_);
this->connection_id_ = ntohl (this->connection_id_);
this->type_ = ntohl (this->type_);
this->priority_ = ntohl (this->priority_);
}
// Decode from network byte order to host byte order.
void encode (void)
{
this->len_ = htonl (this->len_);
this->connection_id_ = htonl (this->connection_id_);
this->type_ = htonl (this->type_);
this->priority_ = htonl (this->priority_);
}
// Encode from host byte order to network byte order.
ACE_INT32 len_;
// Length of the data_ payload, in bytes.
CONNECTION_ID connection_id_;
// Unique connection identifier that denotes a particular
// Connection_Handler.
ACE_INT32 type_;
// Event type, e.g., <ROUTING_EVENT> or <SUBSCRIPTION_EVENT>.
ACE_INT32 priority_;
// Event priority.
};
class Event
{
// = TITLE
// Variable-sized event (data_ may be variable-sized between
// 0 and MAX_PAYLOAD_SIZE).
public:
enum { MAX_PAYLOAD_SIZE = 1024 };
// The maximum size of an Event.
Event_Header header_;
// Event header.
char data_[MAX_PAYLOAD_SIZE];
// Event data.
};
class Subscription
{
// = TITLE
// Allows Consumers to subscribe to be routed information
// arriving from a particular Supplier connection id.
public:
void decode (void)
{
this->connection_id_ = ntohl (this->connection_id_);
for (ACE_INT32 i = 0; i < this->total_consumers_; i++)
this->consumers_[i] = ntohl (this->consumers_[i]);
this->total_consumers_ = ntohl (this->total_consumers_);
}
// Decode from network byte order to host byte order.
void encode (void)
{
this->connection_id_ = htonl (this->connection_id_);
for (ACE_INT32 i = 0; i < this->total_consumers_; i++)
this->consumers_[i] = htonl (this->consumers_[i]);
this->total_consumers_ = htonl (this->total_consumers_);
}
// Encode from host byte order to network byte order.
ACE_INT32 connection_id_;
// Connection id.
ACE_INT32 consumers_[MAX_CONSUMERS];
// Connection ids for consumers that will be routed information
// containing this <connection_id_>
ACE_INT32 total_consumers_;
// Total number of these consumers.
};
#endif /* EVENT_H */
|
