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/*
* Copyright © 2013 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser 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 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/>.
*
* Authored by: Thomas Voß <thomas.voss@canonical.com>
*/
#ifndef COM_UBUNTU_CONNECTION_H_
#define COM_UBUNTU_CONNECTION_H_
#include <functional>
#include <memory>
#include <mutex>
namespace core
{
/**
* @brief The Connection class models a signal-slot connection.
*/
class Connection
{
public:
typedef std::function<void(const std::function<void()>&)> Dispatcher;
/**
* @brief Checks if this instance corresponds to an active signal-slot connection.
* @return true iff the instance corresponds to an active signal-slot connection.
*/
inline bool is_connected() const
{
return (d->disconnector ? true : false);
}
/**
* @brief End a signal-slot connection.
*/
inline void disconnect()
{
d->disconnect();
}
/**
* @brief Installs a dispatcher for this signal-slot connection.
* @param dispatcher The dispatcher to be used for signal emissions.
*/
inline void dispatch_via(const Dispatcher& dispatcher)
{
if (d->dispatcher_installer)
d->dispatcher_installer(dispatcher);
}
private:
typedef std::function<void()> Disconnector;
typedef std::function<void(const Dispatcher&)> DispatcherInstaller;
template<typename ... Arguments> friend class Signal;
inline Connection(const Disconnector& disconnector,
const DispatcherInstaller& installer)
: d(std::make_shared<Private>(disconnector, installer))
{
}
inline void reset()
{
d->reset();
}
struct Private
{
Private(const Connection::Disconnector& disconnector_,
const Connection::DispatcherInstaller& dispatcher_installer_)
: disconnector(disconnector_),
dispatcher_installer(dispatcher_installer_)
{
}
inline void reset()
{
std::lock_guard<std::mutex> lg(guard);
reset_locked();
}
inline void reset_locked()
{
static const Connection::Disconnector empty_disconnector{};
static const Connection::DispatcherInstaller empty_dispatcher_installer{};
disconnector = empty_disconnector;
dispatcher_installer = empty_dispatcher_installer;
}
inline void disconnect()
{
static const Connection::Disconnector empty_disconnector{};
std::lock_guard<std::mutex> lg(guard);
if (disconnector)
disconnector();
reset_locked();
}
std::mutex guard;
Connection::Disconnector disconnector;
Connection::DispatcherInstaller dispatcher_installer;
};
// The whole class is implicitly shared and we thus forward our complete
// shared state to a private structure that is lifetime-managed by a shared_ptr.
std::shared_ptr<Private> d;
};
/**
* @brief Scoped helper class to map signal-slot connection mgmt. to RAII.
*/
class ScopedConnection
{
public:
/**
* @brief Constructs an instance for an existing signal-slot connection.
* @param c The existing signal-slot connection.
*/
inline ScopedConnection(const Connection& c) : connection(c)
{
}
ScopedConnection(const ScopedConnection&) = delete;
/**
* @brief Disconnects the signal-slot connection.
*/
inline ~ScopedConnection() noexcept(true)
{
try
{
connection.disconnect();
} catch(...)
{
}
}
ScopedConnection& operator=(const ScopedConnection&) = delete;
bool operator==(const ScopedConnection&) = delete;
private:
Connection connection;
};
}
#endif // COM_UBUNTU_CONNECTION_H_
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