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/*
* Copyright 2020 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ODBUS_FILTER_HELPER_HXX
#define ODBUS_FILTER_HELPER_HXX
#include "util/BindMethod.hxx"
#include <dbus/dbus.h>
#include <cassert>
namespace ODBus {
/**
* A helper for dbus_connection_add_filter() and
* dbus_connection_remove_filter().
*/
class FilterHelper final {
DBusConnection *connection = nullptr;
using Callback = BoundMethod<DBusHandlerResult(DBusConnection *dbus_connection,
DBusMessage *message) noexcept>;
Callback callback;
public:
FilterHelper() = default;
FilterHelper(DBusConnection *_connection, Callback _callback) noexcept {
Add(_connection, _callback);
}
~FilterHelper() noexcept {
Remove();
}
operator bool() const noexcept {
return connection != nullptr;
}
DBusConnection *GetConnection() noexcept {
assert(connection != nullptr);
return connection;
}
void Add(DBusConnection *_connection, Callback _callback) noexcept {
assert(connection == nullptr);
connection = _connection;
callback = _callback;
dbus_connection_add_filter(connection, HandleMessage, this,
nullptr);
}
void Remove() noexcept {
if (!*this)
return;
dbus_connection_remove_filter(connection, HandleMessage, this);
connection = nullptr;
}
private:
DBusHandlerResult HandleMessage(DBusConnection *dbus_connection,
DBusMessage *message) noexcept;
static DBusHandlerResult HandleMessage(DBusConnection *,
DBusMessage *message,
void *user_data) noexcept;
};
} // namespace ODBus
#endif