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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 "listener.hpp"
#include "simple_semaphore.hpp"
#include "zmq_tcp_engine.hpp"
#include "io_thread.hpp"
#include "session_stub.hpp"
#include "session.hpp"
#include "err.hpp"
#include "dummy_aggregator.hpp"
#include "dummy_distributor.hpp"
zs::listener_t::listener_t (io_thread_t *thread_, const char *addr_,
session_t *peer_, bool has_in_, bool has_out_, uint64_t taskset_) :
io_object_t (thread_),
poller (NULL),
addr (addr_),
peer (peer_),
taskset (taskset_),
has_in (has_in_),
has_out (has_out_)
{
}
void zs::listener_t::terminate ()
{
for (session_stubs_t::size_type i = 0; i != session_stubs.size (); i++)
session_stubs [i]->terminate ();
delete this;
}
void zs::listener_t::shutdown ()
{
for (session_stubs_t::size_type i = 0; i != session_stubs.size (); i++)
session_stubs [i]->shutdown ();
delete this;
}
zs::listener_t::~listener_t ()
{
}
void zs::listener_t::got_identity (session_stub_t *session_stub_,
const char *identity_)
{
// Get the engine allready disconnected from the stub and poller.
i_engine *engine = session_stub_->detach_engine ();
zs_assert (engine);
// Find the corresponding session.
session_t *session;
sessions_t::iterator it = sessions.find (identity_);
// Destroy the stub.
int i = session_stub_->get_index ();
session_stubs [i] = session_stubs [session_stubs.size () - 1];
session_stubs [i]->set_index (i);
session_stubs.pop_back ();
session_stub_->terminate ();
// If there's no session with the specified identity, create one.
if (it != sessions.end ()) {
session = it->second;
session->inc_seqnum ();
}
else {
// Choose an I/O thread with the least load to handle the new session.
io_thread_t *io_thread = choose_io_thread (taskset);
// Create the session and bind it to the I/O thread and peer. Make
// sure that the peer session won't get deallocated till it processes
// the subsequent bind command.
i_mux *mux = new dummy_aggregator_t;
zs_assert (mux);
i_demux *demux = new dummy_distributor_t;
zs_assert (demux);
session = new session_t (io_thread, io_thread, mux, demux, false, true);
zs_assert (session);
session->inc_seqnum ();
session->inc_seqnum ();
peer->inc_seqnum ();
send_reg_and_bind (session, peer, has_in, has_out);
}
// Attach the engine to the session.
send_engine (session, engine);
}
void zs::listener_t::process_reg (simple_semaphore_t *smph_)
{
zs_assert (!poller);
poller = get_poller ();
// Open the listening socket.
int rc = tcp_listener.open (addr.c_str ());
zs_assert (rc == 0);
// Unlock the application thread that created the listener.
if (smph_)
smph_->post ();
// Start polling for incoming connections.
handle = poller->add_fd (tcp_listener.get_fd (), this);
poller->set_pollin (handle);
}
void zs::listener_t::process_unreg (simple_semaphore_t *smph_)
{
// Disassociate listener from the poller.
zs_assert (poller);
poller->rm_fd (handle);
poller = NULL;
// Unlock the application thread closing the listener.
if (smph_)
smph_->post ();
}
void zs::listener_t::in_event ()
{
fd_t fd = tcp_listener.accept ();
// If connection was reset by the peer in the meantime, just ignore it.
// TODO: Handle specific errors like ENFILE/EMFILE etc.
if (fd == retired_fd)
return;
// Create an session stub for the engine to take care for it till its
// identity is retreived.
session_stub_t *session_stub = new session_stub_t (this);
zs_assert (session_stub);
session_stub->set_index (session_stubs.size ());
session_stubs.push_back (session_stub);
// Create an engine to encaspulate the socket. Engine will register itself
// with the stub so the stub will be able to free it in case of shutdown.
zmq_tcp_engine_t *engine = new zmq_tcp_engine_t (fd);
zs_assert (engine);
engine->attach (poller, session_stub);
}
void zs::listener_t::out_event ()
{
zs_assert (false);
}
void zs::listener_t::timer_event ()
{
zs_assert (false);
}
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