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/*
* Copyright 2003-2018 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_UPDATE_REMOVE_HXX
#define MPD_UPDATE_REMOVE_HXX
#include "event/DeferEvent.hxx"
#include "thread/Mutex.hxx"
#include "util/Compiler.h"
#include <forward_list>
#include <string>
struct Song;
class DatabaseListener;
/**
* This class handles #Song removal. It defers the action to the main
* thread to ensure that all references to the #Song are gone.
*/
class UpdateRemoveService final {
DatabaseListener &listener;
Mutex mutex;
std::forward_list<std::string> uris;
DeferEvent defer;
public:
UpdateRemoveService(EventLoop &_loop, DatabaseListener &_listener)
:listener(_listener),
defer(_loop, BIND_THIS_METHOD(RunDeferred)) {}
/**
* Sends a signal to the main thread which will in turn remove
* the song: from the sticker database and from the playlist.
* This serialized access is implemented to avoid excessive
* locking.
*/
void Remove(std::string &&uri);
private:
/* DeferEvent callback */
void RunDeferred() noexcept;
};
#endif
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