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/*
Copyright (c) 2007-2009 FastMQ Inc.
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the Lesser GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
Lesser GNU General Public License for more details.
You should have received a copy of the Lesser GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ZMQ_SOCKET_BASE_HPP_INCLUDED__
#define __ZMQ_SOCKET_BASE_HPP_INCLUDED__
#include <set>
#include <map>
#include <vector>
#include <string>
#include "i_endpoint.hpp"
#include "object.hpp"
#include "mutex.hpp"
#include "options.hpp"
#include "stdint.hpp"
namespace zmq
{
class socket_base_t : public object_t, public i_endpoint
{
public:
socket_base_t (class app_thread_t *parent_, int type_);
virtual ~socket_base_t ();
// Interface for communication with the API layer.
virtual int setsockopt (int option_, const void *optval_,
size_t optvallen_);
virtual int bind (const char *addr_);
virtual int connect (const char *addr_);
virtual int send (struct zmq_msg_t *msg_, int flags_);
virtual int flush ();
virtual int recv (struct zmq_msg_t *msg_, int flags_);
virtual int close ();
// The list of sessions cannot be accessed via inter-thread
// commands as it is unacceptable to wait for the completion of the
// action till user application yields control of the application
// thread to 0MQ.
bool register_session (const char *name_, class session_t *session_);
bool unregister_session (const char *name_);
class session_t *find_session (const char *name_);
// i_endpoint interface implementation.
void attach_inpipe (class reader_t *pipe_);
void attach_outpipe (class writer_t *pipe_);
void revive (class reader_t *pipe_);
void detach_inpipe (class reader_t *pipe_);
void detach_outpipe (class writer_t *pipe_);
// Manipulating index in the app_thread's list of sockets.
void set_index (int index);
int get_index ();
private:
// Handlers for incoming commands.
void process_own (class owned_t *object_);
void process_bind (class owned_t *session_,
class reader_t *in_pipe_, class writer_t *out_pipe_);
void process_term_req (class owned_t *object_);
void process_term_ack ();
// Attempts to distribute the message to all the outbound pipes.
// Returns false if not possible because of pipe overflow.
bool distribute (struct zmq_msg_t *msg_, bool flush_);
// Gets a message from one of the inbound pipes. Implementation of
// fair queueing.
bool fetch (struct zmq_msg_t *msg_);
// Type of the socket.
int type;
// List of all I/O objects owned by this socket. The socket is
// responsible for deallocating them before it quits.
typedef std::set <class owned_t*> io_objects_t;
io_objects_t io_objects;
// Inbound pipes, i.e. those the socket is getting messages from.
typedef std::vector <class reader_t*> in_pipes_t;
in_pipes_t in_pipes;
// Index of the next inbound pipe to read messages from.
in_pipes_t::size_type current;
// Number of active inbound pipes. Active pipes are stored in the
// initial section of the in_pipes array.
in_pipes_t::size_type active;
// Outbound pipes, i.e. those the socket is sending messages to.
typedef std::vector <class writer_t*> out_pipes_t;
out_pipes_t out_pipes;
// Number of I/O objects that were already asked to terminate
// but haven't acknowledged it yet.
int pending_term_acks;
// Number of messages received since last command processing.
int ticks;
// Application thread the socket lives in.
class app_thread_t *app_thread;
// Socket options.
options_t options;
// If true, socket is already shutting down. No new work should be
// started.
bool shutting_down;
// List of existing sessions. This list is never referenced from within
// the socket, instead it is used by I/O objects owned by the session.
// As those objects can live in different threads, the access is
// synchronised using 'sessions_sync' mutex.
// Local sessions are those named by the local instance of 0MQ.
// Remote sessions are the sessions who's identities are provided by
// the remote party.
typedef std::map <std::string, session_t*> sessions_t;
sessions_t sessions;
mutex_t sessions_sync;
// Index of the socket in the app_thread's list of sockets.
int index;
socket_base_t (const socket_base_t&);
void operator = (const socket_base_t&);
};
}
#endif
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