armdb 0.12.0

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

use crate::codec::Codec;
use crate::error::DbResult;
use crate::held_ops::HeldOps;
use crate::key::Key;
use crate::{TypedMapShard, TypedShard, TypedWriteHook};

impl<K, T, C, H> HeldOps for TypedShard<'_, K, T, C, H>
where
    K: Key,
    T: Send + Sync,
    C: Codec<T>,
    H: TypedWriteHook<K, T>,
{
    type Key = K;
    type Val = T;

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

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

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

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

impl<K, T, C, H> HeldOps for TypedMapShard<'_, K, T, C, H>
where
    K: Key + Hash + Eq,
    T: Send + Sync,
    C: Codec<T>,
    H: TypedWriteHook<K, T>,
{
    type Key = K;
    type Val = T;

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

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

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

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