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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.
*/
#include "config.h"
#include "Service.hxx"
#include "UpdateDomain.hxx"
#include "db/DatabaseListener.hxx"
#include "db/plugins/simple/SimpleDatabasePlugin.hxx"
#include "Idle.hxx"
#include "util/Error.hxx"
#include "Log.hxx"
#include "Instance.hxx"
#include "system/FatalError.hxx"
#include "thread/Id.hxx"
#include "thread/Thread.hxx"
#include "thread/Util.hxx"
#ifndef NDEBUG
#include "event/Loop.hxx"
#endif
#include <assert.h>
UpdateService::UpdateService(EventLoop &_loop, SimpleDatabase &_db,
Storage &_storage,
DatabaseListener &_listener)
:DeferredMonitor(_loop), db(_db), listener(_listener),
progress(UPDATE_PROGRESS_IDLE),
update_task_id(0),
walk(_loop, _listener, _storage)
{
}
inline void
UpdateService::Task()
{
if (!next.path_utf8.empty())
FormatDebug(update_domain, "starting: %s",
next.path_utf8.c_str());
else
LogDebug(update_domain, "starting");
SetThreadIdlePriority();
modified = walk.Walk(*db.GetRoot(), next.path_utf8.c_str(),
next.discard);
if (modified || !db.FileExists()) {
Error error;
if (!db.Save(error))
LogError(error, "Failed to save database");
}
if (!next.path_utf8.empty())
FormatDebug(update_domain, "finished: %s",
next.path_utf8.c_str());
else
LogDebug(update_domain, "finished");
progress = UPDATE_PROGRESS_DONE;
DeferredMonitor::Schedule();
}
void
UpdateService::Task(void *ctx)
{
UpdateService &service = *(UpdateService *)ctx;
return service.Task();
}
void
UpdateService::StartThread(UpdateQueueItem &&i)
{
assert(GetEventLoop().IsInsideOrNull());
progress = UPDATE_PROGRESS_RUNNING;
modified = false;
next = std::move(i);
Error error;
if (!update_thread.Start(Task, this, error))
FatalError(error);
FormatDebug(update_domain,
"spawned thread for update job id %i", next.id);
}
unsigned
UpdateService::GenerateId()
{
unsigned id = update_task_id + 1;
if (id > update_task_id_max)
id = 1;
return id;
}
unsigned
UpdateService::Enqueue(const char *path, bool discard)
{
assert(GetEventLoop().IsInsideOrNull());
if (progress != UPDATE_PROGRESS_IDLE) {
const unsigned id = GenerateId();
if (!queue.Push(path, discard, id))
return 0;
update_task_id = id;
return id;
}
const unsigned id = update_task_id = GenerateId();
StartThread(UpdateQueueItem(path, discard, id));
idle_add(IDLE_UPDATE);
return id;
}
/**
* Called in the main thread after the database update is finished.
*/
void
UpdateService::RunDeferred()
{
assert(progress == UPDATE_PROGRESS_DONE);
assert(next.IsDefined());
update_thread.Join();
next = UpdateQueueItem();
idle_add(IDLE_UPDATE);
if (modified)
/* send "idle" events */
listener.OnDatabaseModified();
auto i = queue.Pop();
if (i.IsDefined()) {
/* schedule the next path */
StartThread(std::move(i));
} else {
progress = UPDATE_PROGRESS_IDLE;
}
}
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