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/*
* Copyright (C) 2003-2014 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_SERVICE_HXX
#define MPD_UPDATE_SERVICE_HXX
#include "check.h"
#include "Queue.hxx"
#include "event/DeferredMonitor.hxx"
#include "thread/Thread.hxx"
#include "Compiler.h"
class SimpleDatabase;
class DatabaseListener;
class UpdateWalk;
class CompositeStorage;
/**
* This class manages the update queue and runs the update thread.
*/
class UpdateService final : DeferredMonitor {
enum Progress {
UPDATE_PROGRESS_IDLE = 0,
UPDATE_PROGRESS_RUNNING = 1,
UPDATE_PROGRESS_DONE = 2
};
SimpleDatabase &db;
CompositeStorage &storage;
DatabaseListener &listener;
Progress progress;
bool modified;
Thread update_thread;
static const unsigned update_task_id_max = 1 << 15;
unsigned update_task_id;
UpdateQueue queue;
UpdateQueueItem next;
UpdateWalk *walk;
public:
UpdateService(EventLoop &_loop, SimpleDatabase &_db,
CompositeStorage &_storage,
DatabaseListener &_listener);
~UpdateService();
/**
* Returns a non-zero job id when we are currently updating
* the database.
*/
unsigned GetId() const {
return next.id;
}
/**
* Add this path to the database update queue.
*
* @param path a path to update; if an empty string,
* the whole music directory is updated
* @return the job id, or 0 on error
*/
gcc_nonnull_all
unsigned Enqueue(const char *path, bool discard);
/**
* Clear the queue and cancel the current update. Does not
* wait for the thread to exit.
*/
void CancelAllAsync();
/**
* Cancel all updates for the given mount point. If an update
* is already running for it, the method will wait for
* cancellation to complete.
*/
void CancelMount(const char *uri);
private:
/* virtual methods from class DeferredMonitor */
virtual void RunDeferred() override;
/* the update thread */
void Task();
static void Task(void *ctx);
void StartThread(UpdateQueueItem &&i);
unsigned GenerateId();
};
#endif
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