hydroflow 0.10.0

Hydro's low-level dataflow runtime and IR
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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184

use hydroflow::util::collect_ready;
use hydroflow::{assert_graphvis_snapshots, hydroflow_syntax};
use multiplatform_test::multiplatform_test;

#[multiplatform_test]
pub fn test_multiset_delta() {
    let (input_send, input_recv) = hydroflow::util::unbounded_channel::<u32>();
    let (result_send, mut result_recv) = hydroflow::util::unbounded_channel::<u32>();

    let mut flow = hydroflow_syntax! {
        source_stream(input_recv)
            -> multiset_delta()
            -> for_each(|x| result_send.send(x).unwrap());
    };
    assert_graphvis_snapshots!(flow);

    input_send.send(3).unwrap();
    input_send.send(4).unwrap();
    input_send.send(3).unwrap();
    flow.run_tick();
    assert_eq!(&[3, 4, 3], &*collect_ready::<Vec<_>, _>(&mut result_recv));

    input_send.send(3).unwrap();
    input_send.send(5).unwrap();
    input_send.send(3).unwrap();
    input_send.send(3).unwrap();
    flow.run_tick();
    // First two "3"s are removed due to previous tick.
    assert_eq!(&[5, 3], &*collect_ready::<Vec<_>, _>(&mut result_recv));
}

#[multiplatform_test]
pub fn test_persist_multiset_delta() {
    let (input_send, input_recv) = hydroflow::util::unbounded_channel::<usize>();
    let (output_send, mut output_recv) = hydroflow::util::unbounded_channel::<usize>();
    let mut flow = hydroflow::hydroflow_syntax! {
        source_stream(input_recv)
            -> persist::<'static>()
            -> multiset_delta()
            -> for_each(|x| output_send.send(x).unwrap());
    };

    input_send.send(1).unwrap();
    flow.run_tick();
    assert_eq!(&[(1)], &*collect_ready::<Vec<_>, _>(&mut output_recv));

    flow.run_tick();
    assert!(collect_ready::<Vec<_>, _>(&mut output_recv).is_empty());

    flow.run_tick();
    assert!(collect_ready::<Vec<_>, _>(&mut output_recv).is_empty());
}

#[multiplatform_test]
pub fn test_multiset_delta_2() {
    let (input_send, input_recv) = hydroflow::util::unbounded_channel::<u32>();
    let (result_send, mut result_recv) = hydroflow::util::unbounded_channel::<u32>();

    let mut flow = hydroflow_syntax! {
        source_stream(input_recv)
            -> multiset_delta()
            -> for_each(|x| result_send.send(x).unwrap());
    };

    input_send.send(3).unwrap();
    input_send.send(4).unwrap();
    input_send.send(3).unwrap();
    flow.run_tick();
    assert_eq!(&[3, 4, 3], &*collect_ready::<Vec<_>, _>(&mut result_recv));

    input_send.send(3).unwrap();
    input_send.send(4).unwrap();
    input_send.send(3).unwrap();
    input_send.send(3).unwrap();
    flow.run_tick();

    assert_eq!(&[3], &*collect_ready::<Vec<_>, _>(&mut result_recv));
}

#[multiplatform_test]
fn test_chat_app_replay() {
    let (users_send, users) = hydroflow::util::unbounded_channel::<u32>();
    let (messages_send, messages) = hydroflow::util::unbounded_channel::<String>();
    let (out, mut out_recv) = hydroflow::util::unbounded_channel::<(u32, String)>();

    let mut chat_server = hydroflow_syntax! {
        users = source_stream(users) -> persist::<'static>();
        messages = source_stream(messages) -> persist::<'static>();
        users -> [0]crossed;
        messages -> [1]crossed;
        crossed = cross_join::<'tick, 'tick>()
            -> multiset_delta()
            -> for_each(|t| {
                out.send(t).unwrap();
            });
    };

    users_send.send(1).unwrap();
    users_send.send(2).unwrap();

    messages_send.send("hello".to_string()).unwrap();
    messages_send.send("world".to_string()).unwrap();

    chat_server.run_tick();

    assert_eq!(
        &[
            (1, "hello".to_string()),
            (2, "hello".to_string()),
            (1, "world".to_string()),
            (2, "world".to_string())
        ],
        &*collect_ready::<Vec<_>, _>(&mut out_recv),
    );

    users_send.send(3).unwrap();

    messages_send.send("goodbye".to_string()).unwrap();

    chat_server.run_tick();

    // fails with: [(1, "hello"), (2, "hello"), (3, "hello"), (1, "world"), (2, "world"), (3, "world"), (1, "goodbye"), (2, "goodbye"), (3, "goodbye")]

    assert_eq!(
        &[
            (3, "hello".to_string()),
            (3, "world".to_string()),
            (1, "goodbye".to_string()),
            (2, "goodbye".to_string()),
            (3, "goodbye".to_string())
        ],
        &*collect_ready::<Vec<_>, _>(&mut out_recv),
    );
}

#[multiplatform_test]
fn test_chat_app_replay_manual() {
    let (input_send, input_recv) = hydroflow::util::unbounded_channel::<(u32, String)>();
    let (result_send, mut result_recv) = hydroflow::util::unbounded_channel::<(u32, String)>();

    let mut flow = hydroflow_syntax! {
        source_stream(input_recv)
            -> multiset_delta()
            -> for_each(|x| result_send.send(x).unwrap());
    };

    input_send.send((1, "hello".to_owned())).unwrap();
    input_send.send((2, "hello".to_owned())).unwrap();
    input_send.send((1, "world".to_owned())).unwrap();
    input_send.send((2, "world".to_owned())).unwrap();

    flow.run_tick();
    assert_eq!(
        &[
            (1, "hello".to_string()),
            (2, "hello".to_string()),
            (1, "world".to_string()),
            (2, "world".to_string())
        ],
        &*collect_ready::<Vec<_>, _>(&mut result_recv),
    );

    input_send.send((1, "hello".to_owned())).unwrap();
    input_send.send((2, "hello".to_owned())).unwrap();
    input_send.send((3, "hello".to_owned())).unwrap();
    input_send.send((1, "world".to_owned())).unwrap();
    input_send.send((2, "world".to_owned())).unwrap();
    input_send.send((3, "world".to_owned())).unwrap();
    input_send.send((1, "goodbye".to_owned())).unwrap();
    input_send.send((2, "goodbye".to_owned())).unwrap();
    input_send.send((3, "goodbye".to_owned())).unwrap();

    flow.run_tick();
    assert_eq!(
        &[
            (3, "hello".to_string()),
            (3, "world".to_string()),
            (1, "goodbye".to_string()),
            (2, "goodbye".to_string()),
            (3, "goodbye".to_string())
        ],
        &*collect_ready::<Vec<_>, _>(&mut result_recv),
    );
}