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/*
* Copyright 2003-2019 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_INPUT_CACHE_ITEM_HXX
#define MPD_INPUT_CACHE_ITEM_HXX
#include "input/BufferingInputStream.hxx"
#include "thread/Mutex.hxx"
#include "util/SparseBuffer.hxx"
#include <boost/intrusive/list.hpp>
#include <boost/intrusive/set_hook.hpp>
#include <memory>
#include <string>
class InputCacheLease;
/**
* An item in the #InputCacheManager. It caches the contents of a
* file, and reading and managing it through the base class
* #BufferingInputStream.
*
* Use the class #CacheInputStream to read from it.
*/
class InputCacheItem final
: public BufferingInputStream,
public boost::intrusive::list_base_hook<boost::intrusive::link_mode<boost::intrusive::auto_unlink>>,
public boost::intrusive::set_base_hook<boost::intrusive::link_mode<boost::intrusive::normal_link>>
{
const std::string uri;
using LeaseList =
boost::intrusive::list<InputCacheLease,
boost::intrusive::base_hook<boost::intrusive::list_base_hook<boost::intrusive::link_mode<boost::intrusive::normal_link>>>,
boost::intrusive::constant_time_size<false>>;
LeaseList leases;
LeaseList::iterator next_lease = leases.end();
public:
explicit InputCacheItem(InputStreamPtr _input) noexcept;
~InputCacheItem() noexcept;
const char *GetUri() const noexcept {
return uri.c_str();
}
using BufferingInputStream::size;
bool IsInUse() const noexcept {
const std::lock_guard<Mutex> lock(mutex);
return !leases.empty();
}
void AddLease(InputCacheLease &lease) noexcept;
void RemoveLease(InputCacheLease &lease) noexcept;
private:
/* virtual methods from class BufferingInputStream */
void OnBufferAvailable() noexcept override;
};
#endif
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