nuts 0.2.1

Nuts is a library that offers a simple publish-subscribe API, featuring decoupled creation of the publisher and the subscriber.
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

use super::*;

#[test]
fn active_inactive() {
    let a = TestActivity::new();
    let counter = a.shared_counter_ref();
    // Start as not active
    let id = crate::new_activity(a);
    id.set_status(LifecycleStatus::Inactive);

    // Register for active only
    id.subscribe(|activity: &mut TestActivity, _msg: &TestUpdateMsg| {
        activity.inc(1);
    });

    crate::publish(TestUpdateMsg);
    assert_eq!(counter.get(), 0, "Called inactive activity");
    id.set_status(LifecycleStatus::Active);
    crate::publish(TestUpdateMsg);
    assert_eq!(counter.get(), 1, "Activation for activity didn't work");
}

#[test]
fn enter_leave() {
    let a = TestActivity::new();
    let counter = a.shared_counter_ref();
    let id = crate::new_activity(a);

    id.on_enter(|activity: &mut TestActivity| {
        activity.inc(1);
    });
    id.on_leave(|activity: &mut TestActivity| {
        activity.inc(10);
    });

    crate::publish(TestUpdateMsg);
    assert_eq!(counter.get(), 0, "Called enter/leave without status change");

    id.set_status(LifecycleStatus::Inactive);
    assert_eq!(counter.get(), 10);

    id.set_status(LifecycleStatus::Active);
    assert_eq!(counter.get(), 11);
}

#[test]
fn set_status_inside_publish() {
    let a = TestActivity::new();
    let counter = a.shared_counter_ref();
    let id = crate::new_activity(a);
    id.subscribe(move |activity, _msg: &TestUpdateMsg| {
        activity.inc(1);
        id.set_status(LifecycleStatus::Inactive);
    });
    crate::publish(TestUpdateMsg);
    crate::publish(TestUpdateMsg);
    crate::publish(TestUpdateMsg);
    assert_eq!(1, counter.get());
}

#[test]
fn on_delete() {
    let a = TestActivity::new();
    let counter = a.shared_counter_ref();
    let id = crate::new_activity(a);
    id.on_delete(|a| a.inc(1));
    assert_eq!(0, counter.get());

    id.set_status(LifecycleStatus::Deleted);
    assert_eq!(1, counter.get());
}

#[test]
fn on_delete_domained() {
    let a = TestActivity::new();
    let counter = a.shared_counter_ref();
    let d = TestDomains::DomainA;
    crate::store_to_domain(&d, 7usize);

    let id = crate::new_domained_activity(a, &d);
    id.on_delete_domained(|a, domain| {
        let x: usize = *domain.get();
        assert_eq!(7, x);
        a.inc(1)
    });
    assert_eq!(0, counter.get()); // Make sure subscription has not been called, yet

    id.set_status(LifecycleStatus::Deleted);

    assert_eq!(1, counter.get()); // Make sure subscription has been called
}

#[test]
fn delete_without_handler() {
    let aid = crate::new_activity(());
    aid.set_status(LifecycleStatus::Deleted);
}

#[test]
fn delete_twice() {
    let aid = crate::new_activity(());
    aid.set_status(LifecycleStatus::Deleted);
    aid.set_status(LifecycleStatus::Deleted);
}

#[test]
#[should_panic]
fn activate_after_delete() {
    let a = TestActivity::new();
    let d = TestDomains::DomainA;
    let id = crate::new_domained_activity(a, &d);
    id.set_status(LifecycleStatus::Deleted);
    id.set_status(LifecycleStatus::Active);
}

#[test]
// Subscription handlers should not be called after an activity has been deleted
fn call_subscription_after_delete() {
    let a = TestActivity::new();
    let counter = a.shared_counter_ref();
    let d = TestDomains::DomainA;

    let id = crate::new_domained_activity(a, &d);
    id.subscribe_domained(|a, _domain, _msg: &TestMessage| a.inc(1));
    assert_eq!(0, counter.get()); // Make sure subscription has not been called, yet

    // Make sure subscription has ben registered properly
    crate::publish(TestMessage(0));
    assert_eq!(1, counter.get());
    // Make sure subscription is no longer called
    id.set_status(LifecycleStatus::Deleted);
    crate::publish(TestMessage(0));
    assert_eq!(1, counter.get());
}

#[test]
// Subscription handlers should not be called after an activity has been deleted, regardless of it being executed deferred or not
fn deferred_delete_with_hanging_subscription() {
    let outer = crate::new_activity(());
    let a = TestActivity::new();
    let counter = a.shared_counter_ref();
    let counter_clone = counter.clone();
    let id = crate::new_activity(a);
    id.subscribe(|a, msg: &TestMessage| a.inc(msg.0));
    outer.subscribe(move |_, &()| {
        assert_eq!(0, counter_clone.get());
        // This should be called but deferred
        crate::publish(TestMessage(1));
        assert_eq!(0, counter_clone.get());

        id.set_status(LifecycleStatus::Deleted);

        // This should not be called at all
        crate::publish(TestMessage(10));
        assert_eq!(0, counter_clone.get());
    });
    assert_eq!(0, counter.get());
    crate::publish(());
    assert_eq!(1, counter.get());
}

#[test]
// Subscriptions to a deleted activity should be ignored
fn subscribe_after_delete() {
    let a = TestActivity::new();
    let counter = a.shared_counter_ref();
    let d = TestDomains::DomainA;

    let id = crate::new_domained_activity(a, &d);
    id.set_status(LifecycleStatus::Deleted);

    id.subscribe_domained(|a, _domain, _msg: &TestMessage| a.inc(1));
    assert_eq!(0, counter.get()); // Make sure subscription has not been called, yet
                                  // Make sure subscription is not called
    crate::publish(TestMessage(0));
    assert_eq!(0, counter.get());
}

#[test]
fn delete_with_on_leave() {
    let a = TestActivity::new();
    let counter = a.shared_counter_ref();
    let d = TestDomains::DomainA;

    let id = crate::new_domained_activity(a, &d);
    id.on_leave_domained(|a, _domain| a.inc(1));

    assert_eq!(0, counter.get());
    id.set_status(LifecycleStatus::Deleted);
    assert_eq!(1, counter.get());
}

#[test]
fn create_new_after_delete() {
    let a = TestActivity::new();
    let id_a = crate::new_activity(a);
    id_a.set_status(LifecycleStatus::Deleted);
    let num_a: UncheckedActivityId = id_a.into();

    let b = (TestActivity::new(),);
    let id_b = crate::new_activity(b);
    let num_b: UncheckedActivityId = id_b.into();

    assert_ne!(num_a, num_b);
}