rxr 0.1.11

Reactive extensions for event-driven applications
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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245

mod custom_error;
mod register_emissions;

use custom_error::CustomError;
use register_emissions::register_emissions_subscriber;
use rxr::subjects::AsyncSubject;
use rxr::{Observer, Subscribeable};
use std::sync::Arc;

#[test]
fn async_subject_complete() {
    let (mut make_subscriber, nexts, completes, errors) = register_emissions_subscriber();

    let x = make_subscriber.pop().unwrap()();
    let (mut stx, mut srx) = AsyncSubject::emitter_receiver();

    // Capture the initial value within the AsyncSubject.
    stx.next(1);

    assert_eq!(srx.len(), 0);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 0);
    assert_eq!(errors.lock().unwrap().len(), 0);

    // Subscribing a new observer.
    srx.subscribe(x); // 1st

    assert_eq!(srx.len(), 1);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 0);
    assert_eq!(errors.lock().unwrap().len(), 0);

    // Update the stored value.
    stx.next(2);

    // Register two additional subscribers.
    let y = make_subscriber.pop().unwrap()();
    let z = make_subscriber.pop().unwrap()();
    srx.subscribe(y); // 2nd
    srx.subscribe(z); // 3rd

    assert_eq!(srx.len(), 3);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 0);
    assert_eq!(errors.lock().unwrap().len(), 0);

    // Emitting twice more to each of the three registered subscribers.
    stx.next(5);
    stx.next(6);

    // No values are emitted as the AsyncSubject hasn't completed.
    assert_eq!(srx.len(), 3);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 0);
    assert_eq!(errors.lock().unwrap().len(), 0);

    // Signal completion of the AsyncSubject.
    stx.complete();
    stx.next(7);

    assert_eq!(srx.len(), 0);
    assert_eq!(nexts.lock().unwrap().len(), 3);
    assert_eq!(nexts.lock().unwrap().last(), Some(&6));
    assert_eq!(completes.lock().unwrap().len(), 3);
    assert_eq!(errors.lock().unwrap().len(), 0);

    // Subscribe and emit the stored value after completion.
    let y = make_subscriber.pop().unwrap()();
    let z = make_subscriber.pop().unwrap()();
    srx.subscribe(y); // 4th
    srx.subscribe(z); // 5th

    assert_eq!(srx.len(), 0);
    assert_eq!(nexts.lock().unwrap().len(), 5);
    assert_eq!(nexts.lock().unwrap().last(), Some(&6));
    assert_eq!(completes.lock().unwrap().len(), 5);
    assert_eq!(errors.lock().unwrap().len(), 0);
}

#[test]
fn async_subject_complete_empty() {
    let (mut make_subscriber, nexts, completes, errors) = register_emissions_subscriber();

    let x = make_subscriber.pop().unwrap()();
    let (mut stx, mut srx) = AsyncSubject::emitter_receiver();

    // Subscribing a new observer.
    srx.subscribe(x); // 1st

    // Adding additional subscribers.
    let y = make_subscriber.pop().unwrap()();
    let z = make_subscriber.pop().unwrap()();
    srx.subscribe(y); // 2nd
    srx.subscribe(z); // 3rd

    assert_eq!(srx.len(), 3);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 0);
    assert_eq!(errors.lock().unwrap().len(), 0);

    // Signal completion for the AsyncSubject.
    stx.complete();

    assert_eq!(srx.len(), 0);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 3);
    assert_eq!(errors.lock().unwrap().len(), 0);

    // Disregard subsequent `next()` calls.
    stx.next(7);

    // Subscribe and complete after completion without prior registration.
    let z = make_subscriber.pop().unwrap()();
    srx.subscribe(z); // 4th

    assert_eq!(srx.len(), 0);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 4);
    assert_eq!(errors.lock().unwrap().len(), 0);
}

#[test]
fn async_subject_error() {
    let (mut make_subscriber, nexts, completes, errors) = register_emissions_subscriber();

    let x = make_subscriber.pop().unwrap()();
    let (mut stx, mut srx) = AsyncSubject::emitter_receiver();

    // Capturing the initial value within the AsyncSubject.
    stx.next(1);

    assert_eq!(srx.len(), 0);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 0);
    assert_eq!(errors.lock().unwrap().len(), 0);

    // Subscribing a new observer.
    srx.subscribe(x); // 1st

    assert_eq!(srx.len(), 1);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 0);
    assert_eq!(errors.lock().unwrap().len(), 0);

    // Update the stored value.
    stx.next(2);

    // Registering additional subscribers.
    let y = make_subscriber.pop().unwrap()();
    let z = make_subscriber.pop().unwrap()();
    srx.subscribe(y); // 2nd
    srx.subscribe(z); // 3rd

    assert_eq!(srx.len(), 3);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 0);
    assert_eq!(errors.lock().unwrap().len(), 0);

    // Emitting two more times to each of the 3 registered subscribers.
    stx.next(5);
    stx.next(6);

    assert_eq!(srx.len(), 3);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 0);
    assert_eq!(errors.lock().unwrap().len(), 0);

    // Trigger an error on the AsyncSubject.
    stx.error(Arc::new(CustomError));
    stx.next(7);

    assert_eq!(srx.len(), 0);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 0);
    assert_eq!(errors.lock().unwrap().len(), 3);

    // Subscribe and emit stored value after encountering an error.
    let y = make_subscriber.pop().unwrap()();
    let z = make_subscriber.pop().unwrap()();
    srx.subscribe(y); // 4th
    srx.subscribe(z); // 5th

    assert_eq!(srx.len(), 0);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 0);
    assert_eq!(errors.lock().unwrap().len(), 5);
}

#[test]
fn async_subject_error_empty() {
    let (mut make_subscriber, nexts, completes, errors) = register_emissions_subscriber();

    let x = make_subscriber.pop().unwrap()();
    let (mut stx, mut srx) = AsyncSubject::emitter_receiver();

    // Subscribing a new observer.
    srx.subscribe(x); // 1st

    // Adding additional subscribers.
    let y = make_subscriber.pop().unwrap()();
    let z = make_subscriber.pop().unwrap()();
    srx.subscribe(y); // 2nd
    srx.subscribe(z); // 3rd

    assert_eq!(srx.len(), 3);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 0);
    assert_eq!(errors.lock().unwrap().len(), 0);

    // Trigger an error on the AsyncSubject.
    stx.error(Arc::new(CustomError));

    assert_eq!(srx.len(), 0);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 0);
    assert_eq!(errors.lock().unwrap().len(), 3);

    // Disregard subsequent `next()` calls.
    stx.next(7);

    // Subscribe after AsyncSubject triggers an error.
    let z = make_subscriber.pop().unwrap()();
    srx.subscribe(z); // 4th

    assert_eq!(srx.len(), 0);
    assert_eq!(nexts.lock().unwrap().len(), 0);
    assert_eq!(nexts.lock().unwrap().last(), None);
    assert_eq!(completes.lock().unwrap().len(), 0);
    assert_eq!(errors.lock().unwrap().len(), 4);
}