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/*
Copyright (c) 2012 250bpm s.r.o.
Copyright (c) 2012 Other contributors as noted in the AUTHORS file
This file is part of Crossroads I/O project.
Crossroads I/O is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Crossroads 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
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __XS_XRESPONDENT_HPP_INCLUDED__
#define __XS_XRESPONDENT_HPP_INCLUDED__
#include <map>
#include "socket_base.hpp"
#include "session_base.hpp"
#include "stdint.hpp"
#include "blob.hpp"
#include "msg.hpp"
#include "fq.hpp"
namespace xs
{
class ctx_t;
class pipe_t;
class io_thread_t;
// TODO: This class uses O(n) scheduling. Rewrite it to use O(1) algorithm.
class xrespondent_t :
public socket_base_t
{
public:
xrespondent_t (xs::ctx_t *parent_, uint32_t tid_, int sid_);
~xrespondent_t ();
// Overloads of functions from socket_base_t.
int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
void xattach_pipe (xs::pipe_t *pipe_, bool icanhasall_);
int xsend (msg_t *msg_, int flags_);
int xrecv (msg_t *msg_, int flags_);
bool xhas_in ();
bool xhas_out ();
void xread_activated (xs::pipe_t *pipe_);
void xwrite_activated (xs::pipe_t *pipe_);
void xterminated (xs::pipe_t *pipe_);
protected:
// Rollback any message parts that were sent but not yet flushed.
int rollback ();
private:
// Fair queueing object for inbound pipes.
fq_t fq;
// This value is either 0 (nothing is prefetched), 1 (only message body
// is prefetched) or 2 (both identity and message body are prefetched).
int prefetched;
// Holds the prefetched identity.
blob_t prefetched_id;
// Holds the prefetched message.
msg_t prefetched_msg;
// If true, more incoming message parts are expected.
bool more_in;
struct outpipe_t
{
xs::pipe_t *pipe;
bool active;
};
// Outbound pipes indexed by the peer IDs.
typedef std::map <uint32_t, outpipe_t> outpipes_t;
outpipes_t outpipes;
// The pipe we are currently writing to.
xs::pipe_t *current_out;
// If true, more outgoing message parts are expected.
bool more_out;
// Peer ID are generated. It's a simple increment and wrap-over
// algorithm. This value is the next ID to use (if not used already).
uint32_t next_peer_id;
xrespondent_t (const xrespondent_t&);
const xrespondent_t &operator = (const xrespondent_t&);
};
class xrespondent_session_t : public session_base_t
{
public:
xrespondent_session_t (xs::io_thread_t *io_thread_, bool connect_,
socket_base_t *socket_, const options_t &options_,
const char *protocol_, const char *address_);
~xrespondent_session_t ();
private:
xrespondent_session_t (const xrespondent_session_t&);
const xrespondent_session_t &operator = (const xrespondent_session_t&);
};
}
#endif
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