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/*
* Copyright 2003-2020 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_THREAD_BACKGROUND_COMMAND_HXX
#define MPD_THREAD_BACKGROUND_COMMAND_HXX
#include "BackgroundCommand.hxx"
#include "event/DeferEvent.hxx"
#include "thread/Thread.hxx"
#include <exception>
class Client;
class Response;
/**
* A #BackgroundCommand which defers execution into a new thread.
*/
class ThreadBackgroundCommand : public BackgroundCommand {
Thread thread;
DeferEvent defer_finish;
Client &client;
/**
* The error thrown by Run().
*/
std::exception_ptr error;
public:
explicit ThreadBackgroundCommand(Client &_client) noexcept;
auto &GetEventLoop() const noexcept {
return defer_finish.GetEventLoop();
}
void Start() {
thread.Start();
}
void Cancel() noexcept final;
private:
void _Run() noexcept;
void DeferredFinish() noexcept;
protected:
/**
* If this method throws, the exception will be converted to a
* MPD response, and SendResponse() will not be called.
*/
virtual void Run() = 0;
/**
* Send the response after Run() has finished. Note that you
* must not send errors here; if an error occurs, Run() should
* throw an exception instead.
*/
virtual void SendResponse(Response &response) noexcept = 0;
virtual void CancelThread() noexcept = 0;
};
#endif
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