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
// Copyright 2023 The RocketMQ Rust Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! Hash function trait for consistent hashing
//!
//! Provides an abstraction for hashing string keys to 64-bit integer values.
/// Trait for hashing string keys to long integer values
///
/// Implementations of this trait provide different hash algorithms
/// that can be used in consistent hashing rings to distribute keys
/// across nodes.
///
/// # Example
/// ```
/// use rocketmq_common::common::consistenthash::HashFunction;
///
/// struct SimpleHashFunction;
///
/// impl HashFunction for SimpleHashFunction {
/// fn hash(&self, key: &str) -> i64 {
/// // Simple example: sum of character codes
/// key.chars().map(|c| c as i64).sum()
/// }
/// }
///
/// let hasher = SimpleHashFunction;
/// let hash_value = hasher.hash("test-key");
/// assert!(hash_value > 0);
/// ```