reifydb-store-multi 0.8.1

Multi-version storage for OLTP operations with MVCC support
Documentation 
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// SPDX-License-Identifier: Apache-2.0
// Copyright (c) 2026 ReifyDB

use std::{cmp::Reverse, collections::BTreeMap, sync::Arc};

use reifydb_codec::key::encoded::EncodedKey;
use reifydb_core::{common::CommitVersion, interface::store::EntryKind};
use reifydb_runtime::sync::{
	map::Map,
	rwlock::{RwLock, RwLockWriteGuard},
};
use reifydb_value::util::cowvec::CowVec;
use tracing::instrument;

pub(super) type Value = Option<CowVec<u8>>;

pub(super) type CurrentMap = BTreeMap<EncodedKey, (CommitVersion, Value)>;

pub(super) type HistoricalMap = BTreeMap<EncodedKey, BTreeMap<Reverse<CommitVersion>, Value>>;

pub(super) struct Entry {
	pub current: Arc<RwLock<CurrentMap>>,

	pub historical: Arc<RwLock<HistoricalMap>>,
}

impl Entry {
	pub fn new() -> Self {
		Self {
			current: Arc::new(RwLock::new(BTreeMap::new())),
			historical: Arc::new(RwLock::new(BTreeMap::new())),
		}
	}

	#[instrument(name = "store::multi::memory::write_acquire", level = "debug", skip_all)]
	pub fn write_pair(&self) -> (RwLockWriteGuard<'_, CurrentMap>, RwLockWriteGuard<'_, HistoricalMap>) {
		(self.current.write(), self.historical.write())
	}
}

impl Clone for Entry {
	fn clone(&self) -> Self {
		Self {
			current: Arc::clone(&self.current),
			historical: Arc::clone(&self.historical),
		}
	}
}

pub(super) struct Entries {
	pub(super) data: Map<EntryKind, Entry>,
}

impl Default for Entries {
	fn default() -> Self {
		Self {
			data: Map::new(),
		}
	}
}