armdb 0.12.0

sharded bitcask key-value storage optimized for NVMe
Documentation 
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use std::hash::Hash;

use crate::durability::Durability;
use crate::error::DbResult;
use crate::held_ops::HeldOps;
use crate::hook::WriteHook;
use crate::key::Key;
use crate::zero_map::ZeroMapShard;
use crate::zero_tree::ZeroShard;

impl<K, const V: usize, T, D, WH> HeldOps for ZeroShard<'_, K, V, T, D, WH>
where
    K: Key,
    T: Copy + zerocopy::IntoBytes + zerocopy::FromBytes + zerocopy::Immutable,
    D: Durability,
    WH: WriteHook<K>,
{
    type Key = K;
    type Val = T;

    fn try_contains(&mut self, key: &K) -> DbResult<bool> {
        ZeroShard::try_contains(self, key)
    }

    fn with_value<R>(&mut self, key: &K, f: impl FnOnce(&T) -> R) -> DbResult<Option<R>> {
        Ok(ZeroShard::try_get(self, key)?.map(|value| f(&value)))
    }

    fn put(&mut self, key: &K, value: T) -> DbResult<()> {
        ZeroShard::put(self, key, &value).map(drop)
    }

    fn delete(&mut self, key: &K) -> DbResult<()> {
        ZeroShard::delete(self, key).map(drop)
    }
}

impl<K, const V: usize, T, D, WH> HeldOps for ZeroMapShard<'_, K, V, T, D, WH>
where
    K: Key + Send + Sync + Hash + Eq,
    T: Copy + zerocopy::IntoBytes + zerocopy::FromBytes + zerocopy::Immutable,
    D: Durability,
    WH: WriteHook<K>,
{
    type Key = K;
    type Val = T;

    fn try_contains(&mut self, key: &K) -> DbResult<bool> {
        ZeroMapShard::try_contains(self, key)
    }

    fn with_value<R>(&mut self, key: &K, f: impl FnOnce(&T) -> R) -> DbResult<Option<R>> {
        Ok(ZeroMapShard::try_get(self, key)?.map(|value| f(&value)))
    }

    fn put(&mut self, key: &K, value: T) -> DbResult<()> {
        ZeroMapShard::put(self, key, &value).map(drop)
    }

    fn delete(&mut self, key: &K) -> DbResult<()> {
        ZeroMapShard::delete(self, key).map(drop)
    }
}