109 lines
2.5 KiB
C++
109 lines
2.5 KiB
C++
/*
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* Copyright 2003-2017 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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#ifndef MPD_UPDATE_SERVICE_HXX
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#define MPD_UPDATE_SERVICE_HXX
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#include "check.h"
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#include "Queue.hxx"
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#include "event/DeferredMonitor.hxx"
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#include "thread/Thread.hxx"
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#include "Compiler.h"
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class SimpleDatabase;
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class DatabaseListener;
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class UpdateWalk;
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class CompositeStorage;
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/**
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* This class manages the update queue and runs the update thread.
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*/
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class UpdateService final : DeferredMonitor {
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SimpleDatabase &db;
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CompositeStorage &storage;
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DatabaseListener &listener;
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bool modified;
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Thread update_thread;
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static constexpr unsigned update_task_id_max = 1 << 15;
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unsigned update_task_id;
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UpdateQueue queue;
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UpdateQueueItem next;
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UpdateWalk *walk;
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public:
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UpdateService(EventLoop &_loop, SimpleDatabase &_db,
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CompositeStorage &_storage,
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DatabaseListener &_listener);
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~UpdateService();
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/**
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* Returns a non-zero job id when we are currently updating
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* the database.
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*/
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unsigned GetId() const {
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return next.id;
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}
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/**
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* Add this path to the database update queue.
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*
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* @param path a path to update; if an empty string,
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* the whole music directory is updated
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* @return the job id, or 0 on error
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*/
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gcc_nonnull_all
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unsigned Enqueue(const char *path, bool discard);
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/**
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* Clear the queue and cancel the current update. Does not
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* wait for the thread to exit.
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*/
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void CancelAllAsync();
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/**
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* Cancel all updates for the given mount point. If an update
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* is already running for it, the method will wait for
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* cancellation to complete.
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*/
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void CancelMount(const char *uri);
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private:
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/* virtual methods from class DeferredMonitor */
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virtual void RunDeferred() override;
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/* the update thread */
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void Task();
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static void Task(void *ctx);
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void StartThread(UpdateQueueItem &&i);
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unsigned GenerateId();
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};
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#endif
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