179 lines
3.9 KiB
C++
179 lines
3.9 KiB
C++
/*
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* Copyright (C) 2003-2013 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "UpdateGlue.hxx"
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#include "UpdateQueue.hxx"
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#include "UpdateWalk.hxx"
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#include "UpdateRemove.hxx"
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#include "UpdateDomain.hxx"
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#include "Mapper.hxx"
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#include "DatabaseSimple.hxx"
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#include "Idle.hxx"
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#include "GlobalEvents.hxx"
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#include "util/Error.hxx"
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#include "Log.hxx"
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#include "Main.hxx"
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#include "Instance.hxx"
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#include "system/FatalError.hxx"
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#include "thread/Id.hxx"
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#include "thread/Thread.hxx"
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#include <assert.h>
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static enum update_progress {
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UPDATE_PROGRESS_IDLE = 0,
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UPDATE_PROGRESS_RUNNING = 1,
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UPDATE_PROGRESS_DONE = 2
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} progress;
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static bool modified;
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static Thread update_thread;
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static const unsigned update_task_id_max = 1 << 15;
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static unsigned update_task_id;
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static UpdateQueueItem next;
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unsigned
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isUpdatingDB(void)
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{
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return next.id;
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}
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static void
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update_task(gcc_unused void *ctx)
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{
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if (!next.path_utf8.empty())
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FormatDebug(update_domain, "starting: %s",
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next.path_utf8.c_str());
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else
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LogDebug(update_domain, "starting");
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modified = update_walk(next.path_utf8.c_str(), next.discard);
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if (modified || !db_exists()) {
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Error error;
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if (!db_save(error))
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LogError(error, "Failed to save database");
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}
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if (!next.path_utf8.empty())
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FormatDebug(update_domain, "finished: %s",
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next.path_utf8.c_str());
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else
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LogDebug(update_domain, "finished");
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progress = UPDATE_PROGRESS_DONE;
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GlobalEvents::Emit(GlobalEvents::UPDATE);
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}
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static void
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spawn_update_task(UpdateQueueItem &&i)
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{
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assert(main_thread.IsInside());
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progress = UPDATE_PROGRESS_RUNNING;
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modified = false;
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next = std::move(i);
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Error error;
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if (!update_thread.Start(update_task, nullptr, error))
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FatalError(error);
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FormatDebug(update_domain,
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"spawned thread for update job id %i", next.id);
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}
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static unsigned
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generate_update_id()
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{
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unsigned id = update_task_id + 1;
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if (id > update_task_id_max)
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id = 1;
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return id;
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}
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unsigned
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update_enqueue(const char *path, bool discard)
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{
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assert(main_thread.IsInside());
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if (!db_is_simple() || !mapper_has_music_directory())
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return 0;
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if (progress != UPDATE_PROGRESS_IDLE) {
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const unsigned id = generate_update_id();
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if (!update_queue_push(path, discard, id))
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return 0;
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update_task_id = id;
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return id;
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}
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const unsigned id = update_task_id = generate_update_id();
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spawn_update_task(UpdateQueueItem(path, discard, id));
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idle_add(IDLE_UPDATE);
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return id;
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}
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/**
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* Called in the main thread after the database update is finished.
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*/
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static void update_finished_event(void)
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{
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assert(progress == UPDATE_PROGRESS_DONE);
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assert(next.IsDefined());
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update_thread.Join();
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next = UpdateQueueItem();
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idle_add(IDLE_UPDATE);
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if (modified)
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/* send "idle" events */
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instance->DatabaseModified();
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auto i = update_queue_shift();
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if (i.IsDefined()) {
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/* schedule the next path */
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spawn_update_task(std::move(i));
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} else {
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progress = UPDATE_PROGRESS_IDLE;
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}
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}
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void update_global_init(void)
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{
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GlobalEvents::Register(GlobalEvents::UPDATE, update_finished_event);
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update_remove_global_init();
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update_walk_global_init();
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}
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void update_global_finish(void)
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{
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update_walk_global_finish();
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}
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