mirror of
https://github.com/matrix-construct/construct
synced 2024-10-30 10:28:55 +01:00
105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_DB_TXN_H
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namespace ircd::db
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{
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struct txn;
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bool test(const txn &, const std::function<bool (const delta &)> &);
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bool until(const txn &, const std::function<bool (const delta &)> &);
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void for_each(const txn &, const std::function<void (const delta &)> &);
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std::string debug(const txn &);
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}
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class ircd::db::txn
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{
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database *d {nullptr};
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std::unique_ptr<rocksdb::WriteBatch> wb;
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public:
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struct opts;
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struct checkpoint;
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struct append;
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struct handler;
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explicit operator const rocksdb::WriteBatch &() const;
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explicit operator const database &() const;
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explicit operator rocksdb::WriteBatch &();
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explicit operator database &();
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string_view get(const op &, const string_view &col, const string_view &key) const;
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string_view at(const op &, const string_view &col, const string_view &key) const;
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bool has(const op &, const string_view &col, const string_view &key) const;
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delta get(const op &, const string_view &col) const;
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delta at(const op &, const string_view &col) const;
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bool has(const op &, const string_view &col) const;
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bool has(const op &) const;
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size_t bytes() const;
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size_t size() const;
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// commit
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void operator()(database &, const sopts & = {});
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void operator()(const sopts & = {});
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// clear
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void clear();
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txn() = default;
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txn(database &);
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txn(database &, const opts &);
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~txn() noexcept;
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};
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struct ircd::db::txn::append
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{
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append(txn &, database &, const delta &);
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append(txn &, column &, const column::delta &);
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append(txn &, const cell::delta &);
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append(txn &, const row::delta &);
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append(txn &, const delta &);
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append(txn &, const string_view &key, const json::iov &);
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template<class... T> append(txn &, const string_view &key, const json::tuple<T...> &);
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};
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struct ircd::db::txn::checkpoint
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{
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txn &t;
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checkpoint(txn &);
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~checkpoint() noexcept;
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};
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struct ircd::db::txn::opts
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{
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size_t reserve_bytes = 0;
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size_t max_bytes = 0;
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};
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template<class... T>
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ircd::db::txn::append::append(txn &txn,
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const string_view &key,
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const json::tuple<T...> &tuple)
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{
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for_each(tuple, [&txn, &key](const auto &col, auto&& val)
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{
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if(defined(val)) append
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{
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txn, delta
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{
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col, key, byte_view<string_view>{val}
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}
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};
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});
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}
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