mirror of
https://github.com/matrix-construct/construct
synced 2024-11-25 00:02:34 +01:00
150 lines
4 KiB
C++
150 lines
4 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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using delta_closure = std::function<void (const delta &)>;
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using delta_closure_bool = std::function<bool (const delta &)>;
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using seq_closure = std::function<void (txn &, const uint64_t &)>;
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using seq_closure_bool = std::function<bool (txn &, const uint64_t &)>;
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bool for_each(const txn &, const delta_closure_bool &);
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void for_each(const txn &, const delta_closure &);
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bool for_each(database &d, const uint64_t &seq, const seq_closure_bool &);
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void for_each(database &d, const uint64_t &seq, const seq_closure &);
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void get(database &d, const uint64_t &seq, const seq_closure &);
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string_view debug(const mutable_buffer &out, const txn &, const long &fmt = 0);
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string_view debug(const mutable_buffer &out, database &, const rocksdb::WriteBatch &, const long &fmt = 0);
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}
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struct ircd::db::txn
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{
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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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enum state :uint8_t;
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using value_closure = std::function<void (const string_view &)>;
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database *d {nullptr};
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std::unique_ptr<rocksdb::WriteBatch> wb;
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enum state state {0};
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public:
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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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template<class T = string_view> T val(const op &, const string_view &col, const string_view &key, T def = {}) const;
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template<class T = string_view> T at(const op &, const string_view &col, const string_view &key) const;
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bool get(const op &, const string_view &col, const string_view &key, const value_closure &) const;
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void at(const op &, const string_view &col, const string_view &key, const value_closure &) const;
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bool has(const op &, const string_view &col, const string_view &key) const;
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bool get(const op &, const string_view &col, const delta_closure &) const;
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void at(const op &, const string_view &col, const delta_closure &) 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; // size of data in txn.
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size_t size() const; // count of updates in txn.
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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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// reset
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void clear();
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auto release() noexcept;
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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(database &, std::unique_ptr<rocksdb::WriteBatch> &&);
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~txn() noexcept;
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};
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enum ircd::db::txn::state
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:uint8_t
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{
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BUILD = 0,
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COMMIT = 1,
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COMMITTED = 2,
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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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};
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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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T
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ircd::db::txn::at(const op &op,
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const string_view &col,
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const string_view &key)
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const
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{
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T ret;
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at(op, col, key, [&ret](const string_view &val)
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{
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ret = byte_view<T>(val);
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});
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return ret;
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}
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template<class T>
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T
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ircd::db::txn::val(const op &op,
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const string_view &col,
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const string_view &key,
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T ret)
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const
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{
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get(op, col, key, value_closure{[&ret](const string_view &val)
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{
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ret = byte_view<T>(val);
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}});
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return ret;
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}
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inline auto
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ircd::db::txn::release()
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noexcept
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{
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return wb.release();
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}
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