armdb 0.12.0

sharded bitcask key-value storage optimized for NVMe
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51

use std::hash::Hash;

use crate::byte_view::ByteView;
use crate::error::DbResult;
use crate::held_ops::HeldOps;
use crate::hook::WriteHook;
use crate::key::Key;
use crate::var_map::VarMapShard;
use crate::var_tree::VarShard;

impl<K: Key, H: WriteHook<K>> HeldOps for VarShard<'_, K, H> {
    type Key = K;
    type Val = ByteView;

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

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

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

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

impl<K: Key + Send + Sync + Hash + Eq, H: WriteHook<K>> HeldOps for VarMapShard<'_, K, H> {
    type Key = K;
    type Val = ByteView;

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

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

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

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