crabka-client-streams 0.3.2

KIP-1071 Kafka Streams rebalance-protocol client for Apache Kafka in Rust
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
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152

//! DSL config objects mirroring JVM `Grouped`/`Materialized`/`Repartitioned`.
//! `Consumed`/`Produced` are reused from `crate::processor::serde`.

/// Serdes (+ optional repartition name) for `groupBy`/`groupByKey`.
#[derive(Debug, Clone)]
pub struct Grouped<KS, VS> {
    #[allow(dead_code)]
    pub(crate) key_serde: KS,
    #[allow(dead_code)]
    pub(crate) value_serde: VS,
    pub(crate) name: Option<String>,
}
impl<KS, VS> Grouped<KS, VS> {
    pub fn with(key_serde: KS, value_serde: VS) -> Self {
        Self {
            key_serde,
            value_serde,
            name: None,
        }
    }
    #[must_use]
    pub fn with_name(mut self, name: impl Into<String>) -> Self {
        self.name = Some(name.into());
        self
    }
}

/// Store name + serdes + logging flag for a materialized `KTable`.
#[derive(Debug, Clone)]
pub struct Materialized<KS, VS> {
    #[allow(dead_code)]
    pub(crate) key_serde: KS,
    #[allow(dead_code)]
    pub(crate) value_serde: VS,
    pub(crate) store_name: Option<String>,
    pub(crate) logging: bool,
}
impl<KS, VS> Materialized<KS, VS> {
    pub fn with(key_serde: KS, value_serde: VS) -> Self {
        Self {
            key_serde,
            value_serde,
            store_name: None,
            logging: true,
        }
    }
    #[must_use]
    pub fn as_store(mut self, name: impl Into<String>) -> Self {
        self.store_name = Some(name.into());
        self
    }
    #[must_use]
    pub fn with_logging(mut self, on: bool) -> Self {
        self.logging = on;
        self
    }
}

impl<KS, VS> From<(KS, VS)> for Materialized<KS, VS> {
    fn from((key_serde, value_serde): (KS, VS)) -> Self {
        Self::with(key_serde, value_serde)
    }
}

impl<KS, VS> From<(KS, VS)> for Grouped<KS, VS> {
    fn from((key_serde, value_serde): (KS, VS)) -> Self {
        Self::with(key_serde, value_serde)
    }
}

impl<KS, VS> From<(KS, VS)> for Repartitioned<KS, VS> {
    fn from((key_serde, value_serde): (KS, VS)) -> Self {
        Self::with(key_serde, value_serde)
    }
}

impl<KS, V1S, V2S> From<(KS, V1S, V2S)> for StreamJoined<KS, V1S, V2S> {
    fn from((key_serde, value1_serde, value2_serde): (KS, V1S, V2S)) -> Self {
        Self::with(key_serde, value1_serde, value2_serde)
    }
}

/// Serdes for a windowed `KStream`-`KStream` join (`StreamJoined`): the key
/// serde plus the per-side value serdes (`value1` for this/left side, `value2`
/// for the other/right side). The two join-window stores are registered with
/// `key_serde` + the matching value serde, mirroring JVM `StreamJoined.with`.
#[allow(clippy::struct_field_names)] // key/value serdes mirror JVM `StreamJoined`
#[derive(Debug, Clone, Copy)]
pub struct StreamJoined<KS, V1S, V2S> {
    pub(crate) key_serde: KS,
    pub(crate) value1_serde: V1S,
    pub(crate) value2_serde: V2S,
}
impl<KS, V1S, V2S> StreamJoined<KS, V1S, V2S> {
    pub fn with(key_serde: KS, value1_serde: V1S, value2_serde: V2S) -> Self {
        Self {
            key_serde,
            value1_serde,
            value2_serde,
        }
    }
}

/// Serdes + optional name/partitions for an explicit `repartition()`.
#[derive(Debug, Clone)]
pub struct Repartitioned<KS, VS> {
    pub(crate) key_serde: KS,
    pub(crate) value_serde: VS,
    pub(crate) name: Option<String>,
    pub(crate) partitions: Option<i32>,
}
impl<KS, VS> Repartitioned<KS, VS> {
    pub fn with(key_serde: KS, value_serde: VS) -> Self {
        Self {
            key_serde,
            value_serde,
            name: None,
            partitions: None,
        }
    }
    #[must_use]
    pub fn with_name(mut self, name: impl Into<String>) -> Self {
        self.name = Some(name.into());
        self
    }
    #[must_use]
    pub fn num_partitions(mut self, n: i32) -> Self {
        self.partitions = Some(n);
        self
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::processor::serde::{I64Serde, StringSerde};
    use assert2::check;

    #[test]
    fn grouped_materialized_repartitioned_carry_serdes_and_names() {
        let g = Grouped::with(StringSerde, I64Serde).with_name("g1");
        check!(g.name.as_deref() == Some("g1"));
        let m = Materialized::with(StringSerde, I64Serde).as_store("counts");
        check!(m.store_name.as_deref() == Some("counts"));
        check!(m.logging);
        let r = Repartitioned::with(StringSerde, I64Serde)
            .with_name("rp")
            .num_partitions(4);
        check!(r.name.as_deref() == Some("rp"));
        check!(r.partitions == Some(4));
    }
}