reifydb_core/key/
namespace_handler.rs

1// SPDX-License-Identifier: Apache-2.0
2// Copyright (c) 2026 ReifyDB
3
4use reifydb_codec::key::{
5	deserializer::KeyDeserializer,
6	encoded::{EncodedKey, EncodedKeyRange},
7	serializer::KeySerializer,
8};
9
10use crate::{
11	interface::catalog::id::{HandlerId, NamespaceId},
12	key::{EncodableKey, KeyKind},
13};
14
15#[derive(Debug, Clone, PartialEq)]
16pub struct NamespaceHandlerKey {
17	pub namespace: NamespaceId,
18	pub handler: HandlerId,
19}
20
21impl NamespaceHandlerKey {
22	pub fn new(namespace: NamespaceId, handler: HandlerId) -> Self {
23		Self {
24			namespace,
25			handler,
26		}
27	}
28
29	pub fn encoded(namespace: impl Into<NamespaceId>, handler: impl Into<HandlerId>) -> EncodedKey {
30		Self::new(namespace.into(), handler.into()).encode()
31	}
32
33	pub fn full_scan(namespace: NamespaceId) -> EncodedKeyRange {
34		EncodedKeyRange::start_end(Some(Self::link_start(namespace)), Some(Self::link_end(namespace)))
35	}
36
37	fn link_start(namespace: NamespaceId) -> EncodedKey {
38		let mut serializer = KeySerializer::with_capacity(9);
39		serializer.extend_u8(Self::KIND as u8).extend_u64(namespace);
40		serializer.to_encoded_key()
41	}
42
43	fn link_end(namespace: NamespaceId) -> EncodedKey {
44		let mut serializer = KeySerializer::with_capacity(9);
45		serializer.extend_u8(Self::KIND as u8).extend_u64(*namespace - 1);
46		serializer.to_encoded_key()
47	}
48}
49
50impl EncodableKey for NamespaceHandlerKey {
51	const KIND: KeyKind = KeyKind::NamespaceHandler;
52
53	fn encode(&self) -> EncodedKey {
54		let mut serializer = KeySerializer::with_capacity(17);
55		serializer.extend_u8(Self::KIND as u8).extend_u64(self.namespace).extend_u64(self.handler);
56		serializer.to_encoded_key()
57	}
58
59	fn decode(key: &EncodedKey) -> Option<Self> {
60		let mut de = KeyDeserializer::from_bytes(key.as_slice());
61
62		let kind: KeyKind = de.read_u8().ok()?.try_into().ok()?;
63		if kind != Self::KIND {
64			return None;
65		}
66
67		let namespace = de.read_u64().ok()?;
68		let handler = de.read_u64().ok()?;
69
70		Some(Self {
71			namespace: NamespaceId(namespace),
72			handler: HandlerId(handler),
73		})
74	}
75}
76
77#[cfg(test)]
78pub mod tests {
79	use super::{EncodableKey, NamespaceHandlerKey};
80	use crate::interface::catalog::id::{HandlerId, NamespaceId};
81
82	#[test]
83	fn test_encode_decode() {
84		let key = NamespaceHandlerKey {
85			namespace: NamespaceId(0xABCD),
86			handler: HandlerId(0x123456789ABCDEF0),
87		};
88		let encoded = key.encode();
89		let expected: Vec<u8> =
90			vec![0xD1, 0x3F, 0x54, 0x32, 0x00, 0xED, 0xCB, 0xA9, 0x87, 0x65, 0x43, 0x21, 0x0F];
91		assert_eq!(encoded.as_slice(), expected);
92
93		let decoded = NamespaceHandlerKey::decode(&encoded).unwrap();
94		assert_eq!(decoded.namespace, NamespaceId(0xABCD));
95		assert_eq!(decoded.handler, HandlerId(0x123456789ABCDEF0));
96	}
97
98	#[test]
99	fn test_order_preserving() {
100		let key1 = NamespaceHandlerKey {
101			namespace: NamespaceId::SYSTEM,
102			handler: HandlerId(100),
103		};
104		let key2 = NamespaceHandlerKey {
105			namespace: NamespaceId::SYSTEM,
106			handler: HandlerId(200),
107		};
108		let key3 = NamespaceHandlerKey {
109			namespace: NamespaceId::DEFAULT,
110			handler: HandlerId(1),
111		};
112
113		let encoded1 = key1.encode();
114		let encoded2 = key2.encode();
115		let encoded3 = key3.encode();
116
117		assert!(encoded3 < encoded2, "ordering not preserved");
118		assert!(encoded2 < encoded1, "ordering not preserved");
119	}
120}
reifydb_core/key/namespace_handler.rs

reifydb_core/key/
namespace_handler.rs
