104 lines
3.1 KiB
C++
104 lines
3.1 KiB
C++
// This file Copyright © Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
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// or any future license endorsed by Mnemosyne LLC.
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// License text can be found in the licenses/ folder.
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#pragma once
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#ifndef __TRANSMISSION__
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#error only libtransmission should #include this header.
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#endif
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#include <cstddef> // for size_t
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#include <cstdint> // for intX_t, uintX_t
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#include <memory> // for std::unique_ptr
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#include <utility> // for std::pair
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#include <vector>
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#include <small/vector.hpp>
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#include "libtransmission/transmission.h"
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#include "libtransmission/block-info.h"
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#include "libtransmission/values.h"
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class tr_torrents;
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struct tr_torrent;
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class Cache
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{
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public:
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using BlockData = small::max_size_vector<uint8_t, tr_block_info::BlockSize>;
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using Memory = libtransmission::Values::Memory;
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Cache(tr_torrents const& torrents, Memory max_size);
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int set_limit(Memory max_size);
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// @return any error code from cacheTrim()
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int write_block(tr_torrent_id_t tor, tr_block_index_t block, std::unique_ptr<BlockData> writeme);
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int read_block(tr_torrent const& tor, tr_block_info::Location const& loc, size_t len, uint8_t* setme);
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int flush_torrent(tr_torrent_id_t tor_id);
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int flush_file(tr_torrent const& tor, tr_file_index_t file);
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private:
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using Key = std::pair<tr_torrent_id_t, tr_block_index_t>;
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struct CacheBlock
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{
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Key key;
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std::unique_ptr<BlockData> buf;
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};
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using Blocks = std::vector<CacheBlock>;
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using CIter = Blocks::const_iterator;
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[[nodiscard]] static Key make_key(tr_torrent const& tor, tr_block_info::Location loc) noexcept;
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[[nodiscard]] static std::pair<CIter, CIter> find_biggest_span(CIter begin, CIter end) noexcept;
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[[nodiscard]] static CIter find_span_end(CIter span_begin, CIter end) noexcept;
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// @return any error code from tr_ioWrite()
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[[nodiscard]] int write_contiguous(CIter begin, CIter end) const;
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// @return any error code from writeContiguous()
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[[nodiscard]] int flush_span(CIter begin, CIter end);
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// @return any error code from writeContiguous()
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[[nodiscard]] int flush_biggest();
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// @return any error code from writeContiguous()
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[[nodiscard]] int cache_trim();
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[[nodiscard]] static constexpr size_t get_max_blocks(Memory const max_size) noexcept
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{
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return max_size.base_quantity() / tr_block_info::BlockSize;
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}
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[[nodiscard]] CIter get_block(tr_torrent const& tor, tr_block_info::Location const& loc) noexcept;
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tr_torrents const& torrents_;
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Blocks blocks_ = {};
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size_t max_blocks_ = 0;
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mutable size_t disk_writes_ = 0;
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mutable size_t disk_write_bytes_ = 0;
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mutable size_t cache_writes_ = 0;
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mutable size_t cache_write_bytes_ = 0;
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static constexpr struct
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{
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[[nodiscard]] constexpr bool operator()(Key const& key, CacheBlock const& block) const
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{
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return key < block.key;
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}
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[[nodiscard]] constexpr bool operator()(CacheBlock const& block, Key const& key) const
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{
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return block.key < key;
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}
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} CompareCacheBlockByKey{};
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};
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