tsfile-writer 0.1.3

A simple TsFile writer 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

use crate::{CompressionType, MeasurementGroup, MeasurementSchema, Schema, TSDataType, TSEncoding};
use std::collections::HashMap;

pub struct TsFileSchemaBuilder<'a> {
    measurement_groups_map: HashMap<&'a str, MeasurementGroup<'a>>,
}

impl<'a> TsFileSchemaBuilder<'a> {
    pub fn new() -> TsFileSchemaBuilder<'a> {
        TsFileSchemaBuilder {
            measurement_groups_map: HashMap::new(),
        }
    }

    pub fn add(
        &mut self,
        device: &'a str,
        schema: MeasurementGroup<'a>,
    ) -> &mut TsFileSchemaBuilder<'a> {
        self.measurement_groups_map.insert(device, schema);
        self
    }

    pub fn build(&mut self) -> Schema<'a> {
        // Copy the content
        let mut measurement_groups: HashMap<&str, MeasurementGroup> = HashMap::new();
        measurement_groups.clear();
        for (s, mg) in self.measurement_groups_map.iter_mut() {
            measurement_groups.insert(s, mg.clone());
        }
        Schema { measurement_groups }
    }
}

impl<'a> Default for TsFileSchemaBuilder<'a> {
    fn default() -> Self {
        Self::new()
    }
}

pub struct DeviceBuilder<'a> {
    measurement_groups_map: HashMap<&'a str, MeasurementSchema>,
}

impl<'a> DeviceBuilder<'a> {
    pub fn new() -> DeviceBuilder<'a> {
        DeviceBuilder {
            measurement_groups_map: HashMap::new(),
        }
    }

    pub fn add(
        &mut self,
        measurement: &'a str,
        data_type: TSDataType,
        encoding: TSEncoding,
        compression: CompressionType,
    ) -> &mut DeviceBuilder<'a> {
        self.measurement_groups_map.insert(
            measurement,
            MeasurementSchema {
                data_type,
                compression,
                encoding,
            },
        );
        self
    }

    pub fn build(&mut self) -> MeasurementGroup<'a> {
        assert!(!self.measurement_groups_map.is_empty());
        // Copy the content
        let mut measurement_schemas: HashMap<&'a str, MeasurementSchema> = HashMap::new();
        measurement_schemas.clear();
        for (s, ms) in self.measurement_groups_map.iter_mut() {
            measurement_schemas.insert(s, ms.clone());
        }
        MeasurementGroup {
            measurement_schemas,
        }
    }
}

impl<'a> Default for DeviceBuilder<'a> {
    fn default() -> Self {
        Self::new()
    }
}

#[cfg(test)]
mod test {
    use crate::schema::{DeviceBuilder, TsFileSchemaBuilder};
    use crate::{CompressionType, TSDataType, TSEncoding};

    #[test]
    fn use_fluent_builder() {
        let schema = TsFileSchemaBuilder::new()
            .add(
                "d1",
                DeviceBuilder::new()
                    .add(
                        "s1",
                        TSDataType::INT32,
                        TSEncoding::PLAIN,
                        CompressionType::UNCOMPRESSED,
                    )
                    .add(
                        "s2",
                        TSDataType::INT32,
                        TSEncoding::PLAIN,
                        CompressionType::UNCOMPRESSED,
                    )
                    .build(),
            )
            .build();

        assert_eq!(schema.measurement_groups.len(), 1);
        assert_eq!(
            schema
                .measurement_groups
                .get("d1")
                .unwrap()
                .measurement_schemas
                .len(),
            2
        );
    }
}