construct/include/ircd/db/database/mergeop.h

// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.

#pragma once
#define HAVE_IRCD_DB_DATABASE_MERGEOP_H

// This file is not part of the standard include stack because it requires
// RocksDB symbols which we cannot forward declare. It is used internally
// and does not need to be included by general users of IRCd.

struct ircd::db::database::mergeop final
:std::enable_shared_from_this<struct ircd::db::database::mergeop>
,rocksdb::AssociativeMergeOperator
{
	database *d;
	merge_closure merger;

	bool Merge(const rocksdb::Slice &, const rocksdb::Slice *, const rocksdb::Slice &, std::string *, rocksdb::Logger *) const noexcept override;
	const char *Name() const noexcept override;

	mergeop(database *const &d, merge_closure merger = nullptr)
	:d{d}
	,merger{merger? std::move(merger) : ircd::db::merge_operator}
	{}
};