another-rxrust 0.0.46

A different implementation than `rxRust` for easier use of `ReactiveX` 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

use crate::internals::stream_controller::*;
use crate::prelude::*;
use std::marker::PhantomData;
use std::sync::{Arc, RwLock};

#[derive(Clone)]
pub struct Sample<'a, Item, TriggerValue>
where
  Item: Clone + Send + Sync,
  TriggerValue: Clone + Send + Sync,
{
  trigger: Observable<'a, TriggerValue>,
  _item: PhantomData<Item>,
}

impl<'a, Item, TriggerValue> Sample<'a, Item, TriggerValue>
where
  Item: Clone + Send + Sync,
  TriggerValue: Clone + Send + Sync,
{
  pub fn new(
    trigger: Observable<'a, TriggerValue>,
  ) -> Sample<'a, Item, TriggerValue>
  where
    TriggerValue: Clone + Send + Sync,
  {
    Sample { trigger, _item: PhantomData }
  }
  pub fn execute(&self, source: Observable<'a, Item>) -> Observable<'a, Item> {
    let trigger = self.trigger.clone();
    Observable::<Item>::create(move |s| {
      let value = Arc::new(RwLock::new(None::<Item>));
      let sctl = StreamController::new(s);

      let obs_trigger = {
        let value_trigger_next = Arc::clone(&value);
        let sctl_trigger_next = sctl.clone();

        sctl.new_observer(
          move |_, _| {
            let value = {
              let mut v = value_trigger_next.write().unwrap();
              let vv = v.clone();
              *v = None;
              vv
            };
            if let Some(v) = value {
              sctl_trigger_next.sink_next(v);
            }
          },
          |_, _| {},
          |_| {},
        )
      };

      let obs_source = {
        let value_next = Arc::clone(&value);
        let sctl_error = sctl.clone();
        let sctl_complete = sctl.clone();

        sctl.new_observer(
          move |_, x| {
            *value_next.write().unwrap() = Some(x);
          },
          move |_, e| {
            sctl_error.sink_error(e);
          },
          move |_| sctl_complete.sink_complete_force(), // trigger also unsubscribe
        )
      };

      trigger.inner_subscribe(obs_trigger);
      source.inner_subscribe(obs_source);
    })
  }
}

impl<'a, Item> Observable<'a, Item>
where
  Item: Clone + Send + Sync,
{
  pub fn sample<TriggerValue>(
    &self,
    trigger: Observable<'a, TriggerValue>,
  ) -> Observable<'a, Item>
  where
    TriggerValue: Clone + Send + Sync,
  {
    Sample::new(trigger).execute(self.clone())
  }
}

#[cfg(all(test, not(feature = "web")))]
mod test {
  use crate::prelude::*;
  use std::{thread, time};

  #[test]
  fn basic() {
    let sbj = subjects::Subject::new();
    observables::interval(
      time::Duration::from_millis(100),
      schedulers::new_thread_scheduler(),
    )
    .sample(sbj.observable())
    .take(3)
    .subscribe(
      print_next_fmt!("{}"),
      print_error!(),
      print_complete!(),
    );

    (0..3).for_each(|_| {
      thread::sleep(time::Duration::from_millis(500));
      sbj.next(());
    });
    sbj.complete();
    thread::sleep(time::Duration::from_millis(500));
  }
}