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/*
* Copyright (C) 2012 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Michal Hruby <michal.hruby@canonical.com>
*/
#include <algorithm>
#include "UBusServer.h"
namespace unity
{
UBusServer::UBusServer()
: last_id_(0)
{}
unsigned UBusServer::RegisterInterest(std::string const& interest_name,
UBusCallback const& slot)
{
if (!slot || interest_name.empty())
return 0;
unsigned connection_id = ++last_id_;
auto connection = std::make_shared<UBusConnection>(slot, connection_id);
interests_.insert(std::pair<std::string, UBusConnection::Ptr>(interest_name, connection));
return connection_id;
}
void UBusServer::UnregisterInterest(unsigned connection_id)
{
auto it = std::find_if(interests_.begin(), interests_.end(),
[connection_id] (std::pair<std::string, UBusConnection::Ptr> const& p)
{ return p.second->id == connection_id; });
if (it != interests_.end()) interests_.erase(it);
}
void UBusServer::SendMessage(std::string const& message_name,
glib::Variant const& args)
{
SendMessageFull(message_name, args, glib::Source::Priority::DEFAULT_IDLE);
}
void UBusServer::SendMessageFull(std::string const& message_name,
glib::Variant const& args,
glib::Source::Priority prio)
{
// queue the message
msg_queue_.insert(std::pair<int, std::pair<std::string, glib::Variant>>(prio, std::make_pair(message_name, args)));
// start the source (if not already running)
auto src_nick = std::to_string(static_cast<int>(prio));
auto src_ptr = source_manager_.GetSource(src_nick);
if (!src_ptr)
{
source_manager_.Add(new glib::Idle([this, prio] ()
{
return DispatchMessages(prio);
}, prio));
}
}
bool UBusServer::DispatchMessages(glib::Source::Priority prio)
{
// copy messages we are about to dispatch to a separate container
std::vector<std::pair<std::string, glib::Variant> > dispatched_msgs;
auto iterators = msg_queue_.equal_range(prio);
for (auto it = iterators.first; it != iterators.second; ++it)
{
dispatched_msgs.push_back((*it).second);
}
// remove the messages from the queue
msg_queue_.erase(prio);
for (unsigned i = 0; i < dispatched_msgs.size(); i++)
{
// invoke callbacks for this message_name
std::string const& message_name = dispatched_msgs[i].first;
glib::Variant const& msg_args = dispatched_msgs[i].second;
auto interest_it = interests_.find(message_name);
while (interest_it != interests_.end())
{
// add a reference to make sure we don't crash if the slot unregisters itself
UBusConnection::Ptr connection((*interest_it).second);
interest_it++;
// invoke the slot
// FIXME: what if this slot unregisters the next? We should mark the interests map dirty in UnregisterInterest
connection->slot(msg_args);
if (interest_it == interests_.end() ||
(*interest_it).first != message_name)
break;
}
}
// return true if there are new queued messages with this prio
return msg_queue_.find(prio) != msg_queue_.end();
}
}
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