1 /*
2     Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
3 
4     This file is part of libzmq, the ZeroMQ core engine in C++.
5 
6     libzmq is free software; you can redistribute it and/or modify it under
7     the terms of the GNU Lesser General Public License (LGPL) as published
8     by the Free Software Foundation; either version 3 of the License, or
9     (at your option) any later version.
10 
11     As a special exception, the Contributors give you permission to link
12     this library with independent modules to produce an executable,
13     regardless of the license terms of these independent modules, and to
14     copy and distribute the resulting executable under terms of your choice,
15     provided that you also meet, for each linked independent module, the
16     terms and conditions of the license of that module. An independent
17     module is a module which is not derived from or based on this library.
18     If you modify this library, you must extend this exception to your
19     version of the library.
20 
21     libzmq is distributed in the hope that it will be useful, but WITHOUT
22     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
23     FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
24     License for more details.
25 
26     You should have received a copy of the GNU Lesser General Public License
27     along with this program.  If not, see <http://www.gnu.org/licenses/>.
28 */
29 
30 #ifndef __ZMQ_RADIO_HPP_INCLUDED__
31 #define __ZMQ_RADIO_HPP_INCLUDED__
32 
33 #include <map>
34 #include <string>
35 #include <vector>
36 
37 #include "socket_base.hpp"
38 #include "session_base.hpp"
39 #include "dist.hpp"
40 #include "msg.hpp"
41 
42 namespace zmq
43 {
44 class ctx_t;
45 class pipe_t;
46 class io_thread_t;
47 
48 class radio_t ZMQ_FINAL : public socket_base_t
49 {
50   public:
51     radio_t (zmq::ctx_t *parent_, uint32_t tid_, int sid_);
52     ~radio_t ();
53 
54     //  Implementations of virtual functions from socket_base_t.
55     void xattach_pipe (zmq::pipe_t *pipe_,
56                        bool subscribe_to_all_ = false,
57                        bool locally_initiated_ = false);
58     int xsend (zmq::msg_t *msg_);
59     bool xhas_out ();
60     int xrecv (zmq::msg_t *msg_);
61     bool xhas_in ();
62     void xread_activated (zmq::pipe_t *pipe_);
63     void xwrite_activated (zmq::pipe_t *pipe_);
64     int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
65     void xpipe_terminated (zmq::pipe_t *pipe_);
66 
67   private:
68     //  List of all subscriptions mapped to corresponding pipes.
69     typedef std::multimap<std::string, pipe_t *> subscriptions_t;
70     subscriptions_t _subscriptions;
71 
72     //  List of udp pipes
73     typedef std::vector<pipe_t *> udp_pipes_t;
74     udp_pipes_t _udp_pipes;
75 
76     //  Distributor of messages holding the list of outbound pipes.
77     dist_t _dist;
78 
79     //  Drop messages if HWM reached, otherwise return with EAGAIN
80     bool _lossy;
81 
82     ZMQ_NON_COPYABLE_NOR_MOVABLE (radio_t)
83 };
84 
85 class radio_session_t ZMQ_FINAL : public session_base_t
86 {
87   public:
88     radio_session_t (zmq::io_thread_t *io_thread_,
89                      bool connect_,
90                      zmq::socket_base_t *socket_,
91                      const options_t &options_,
92                      address_t *addr_);
93     ~radio_session_t ();
94 
95     //  Overrides of the functions from session_base_t.
96     int push_msg (msg_t *msg_);
97     int pull_msg (msg_t *msg_);
98     void reset ();
99 
100   private:
101     enum
102     {
103         group,
104         body
105     } _state;
106 
107     msg_t _pending_msg;
108 
109     ZMQ_NON_COPYABLE_NOR_MOVABLE (radio_session_t)
110 };
111 }
112 
113 #endif
114