mirror of
https://github.com/matrix-construct/construct
synced 2024-11-17 23:40:57 +01:00
138 lines
3.4 KiB
C++
138 lines
3.4 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_OPTS_H
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namespace ircd::db
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{
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enum class set :uint64_t;
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enum class get :uint64_t;
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template<class> struct opts;
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struct sopts;
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struct gopts;
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template<class T> bool test(const opts<T> &, const typename std::underlying_type<T>::type &);
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template<class T> bool test(const opts<T> &, const T &value);
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template<class T> opts<T> &operator|=(opts<T> &, const opts<T> &);
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template<class T> opts<T> &operator|=(opts<T> &, const T &value);
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template<class T> opts<T> &operator&=(opts<T> &, const opts<T> &);
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template<class T> opts<T> &operator&=(opts<T> &, const T &value);
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}
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enum class ircd::db::set
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:uint64_t
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{
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FSYNC = 0x0001, // Uses kernel filesystem synchronization after write (slow)
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NO_JOURNAL = 0x0002, // Write Ahead Log (WAL) for some crash recovery
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MISSING_COLUMNS = 0x0004, // No exception thrown when writing to a deleted column family
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};
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enum class ircd::db::get
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:uint64_t
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{
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PIN = 0x0001, // Keep iter data in memory for iter lifetime (good for lots of ++/--)
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CACHE = 0x0002, // Update the cache (CACHE is default for non-iterator operations)
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NO_CACHE = 0x0004, // Do not update the cache (NO_CACHE is default for iterators)
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NO_SNAPSHOT = 0x0008, // This iterator will have the latest data (tailing)
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NO_CHECKSUM = 0x0010, // Integrity of data will be checked unless this is specified
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PREFIX = 0x0020, // (prefix_same_as_start); automatic for index columns with pfx
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ORDERED = 0x0040, // (total_order_seek); relevant to index columns
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};
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template<class T>
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struct ircd::db::opts
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{
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using flag_t = typename std::underlying_type<T>::type;
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flag_t value {0};
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opts() = default;
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opts(const std::initializer_list<T> &list)
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:value{combine_flags(list)}
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{}
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};
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struct ircd::db::sopts
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:opts<set>
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{
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using opts<set>::opts;
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};
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struct ircd::db::gopts
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:opts<get>
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{
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database::snapshot snapshot;
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size_t readahead { 4_KiB };
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const rocksdb::Slice *upper_bound {nullptr};
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using opts<get>::opts;
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};
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template<class T>
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ircd::db::opts<T> &
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ircd::db::operator&=(opts<T> &a,
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const T &value)
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{
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using flag_t = typename opts<T>::flag_t;
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a.value &= flag_t(value);
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return a;
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}
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template<class T>
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ircd::db::opts<T> &
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ircd::db::operator&=(opts<T> &a,
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const opts<T> &b)
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{
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a.value &= b.value;
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return a;
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}
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template<class T>
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ircd::db::opts<T> &
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ircd::db::operator|=(opts<T> &a,
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const T &value)
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{
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using flag_t = typename opts<T>::flag_t;
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a.value |= flag_t(value);
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return a;
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}
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template<class T>
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ircd::db::opts<T> &
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ircd::db::operator|=(opts<T> &a,
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const opts<T> &b)
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{
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a.value |= b.value;
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return a;
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}
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template<class T>
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bool
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ircd::db::test(const opts<T> &a,
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const T &value)
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{
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using flag_t = typename opts<T>::flag_t;
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return a.value & flag_t(value);
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}
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template<class T>
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bool
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ircd::db::test(const opts<T> &a,
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const typename std::underlying_type<T>::type &value)
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{
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return (a.value & value) == value;
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}
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