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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/>.
*/
#include "session.hpp"
#include "i_engine.hpp"
#include "err.hpp"
#include "pipe.hpp"
zmq::session_t::session_t (object_t *parent_, socket_base_t *owner_,
const char *name_, const options_t &options_, bool reconnect_) :
owned_t (parent_, owner_),
in_pipe (NULL),
active (true),
out_pipe (NULL),
engine (NULL),
name (name_),
options (options_),
reconnect (reconnect_)
{
}
zmq::session_t::~session_t ()
{
zmq_assert (!in_pipe);
zmq_assert (!out_pipe);
}
bool zmq::session_t::read (::zmq_msg_t *msg_)
{
if (!in_pipe || !active)
return false;
return in_pipe->read (msg_);
}
bool zmq::session_t::write (::zmq_msg_t *msg_)
{
// The communication is unidirectional.
// We don't expect any message to arrive.
zmq_assert (out_pipe);
if (out_pipe->write (msg_)) {
zmq_msg_init (msg_);
return true;
}
return false;
}
void zmq::session_t::flush ()
{
if (out_pipe)
out_pipe->flush ();
}
void zmq::session_t::detach ()
{
// TODO: Start reconnection process here.
// Engine is terminating itself. No need to deallocate it from here.
engine = NULL;
// In the case od anonymous connection, terminate the session.
if (name.empty ())
term ();
}
void zmq::session_t::attach_pipes (class reader_t *inpipe_,
class writer_t *outpipe_)
{
if (inpipe_) {
zmq_assert (!in_pipe);
in_pipe = inpipe_;
active = true;
in_pipe->set_endpoint (this);
}
if (outpipe_) {
zmq_assert (!out_pipe);
out_pipe = outpipe_;
out_pipe->set_endpoint (this);
}
}
void zmq::session_t::detach_inpipe (reader_t *pipe_)
{
active = false;
in_pipe = NULL;
}
void zmq::session_t::detach_outpipe (writer_t *pipe_)
{
out_pipe = NULL;
}
void zmq::session_t::kill (reader_t *pipe_)
{
active = false;
}
void zmq::session_t::revive (reader_t *pipe_)
{
zmq_assert (in_pipe == pipe_);
active = true;
if (engine)
engine->revive ();
}
void zmq::session_t::process_plug ()
{
// Register the session with the socket.
if (!name.empty ()) {
bool ok = owner->register_session (name.c_str (), this);
// There's already a session with the specified identity.
// We should syslog it and drop the session. TODO
zmq_assert (ok);
}
// If session is created by 'connect' function, it has the pipes set
// already. Otherwise, it's being created by the listener and the pipes
// are yet to be created.
if (!in_pipe && !out_pipe) {
pipe_t *inbound = NULL;
pipe_t *outbound = NULL;
if (options.requires_out) {
inbound = new pipe_t (this, owner, options.hwm, options.lwm);
zmq_assert (inbound);
in_pipe = &inbound->reader;
in_pipe->set_endpoint (this);
}
if (options.requires_in) {
outbound = new pipe_t (owner, this, options.hwm, options.lwm);
zmq_assert (outbound);
out_pipe = &outbound->writer;
out_pipe->set_endpoint (this);
}
// Note that initial call to inc_seqnum was optimised out. Last
// parameter conveys the fact to the callee.
send_bind (owner, outbound ? &outbound->reader : NULL,
inbound ? &inbound->writer : NULL, false);
}
owned_t::process_plug ();
}
void zmq::session_t::process_unplug ()
{
// Unregister the session from the socket.
if (!name.empty ()) {
bool ok = owner->unregister_session (name.c_str ());
zmq_assert (ok);
}
// Ask associated pipes to terminate.
if (in_pipe) {
in_pipe->term ();
in_pipe = NULL;
}
if (out_pipe) {
out_pipe->term ();
out_pipe = NULL;
}
if (engine) {
engine->unplug ();
delete engine;
engine = NULL;
}
}
void zmq::session_t::process_attach (i_engine *engine_)
{
zmq_assert (!engine);
zmq_assert (engine_);
engine = engine_;
engine->plug (this);
owned_t::process_attach (engine_);
}
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