hyphae 0.3.0

Reactive cells and runtime primitives for rship
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

use std::sync::{
    Arc,
    atomic::{AtomicU64, Ordering},
};

use crate::{Cell, Gettable, MapExt, Mutable, Signal, traits::Watchable};

// ============================================================================
// WeakCell Tests
// ============================================================================

#[test]
fn test_weak_cell_upgrade_succeeds_while_cell_alive() {
    let cell = Cell::new(42u64);
    let weak = cell.downgrade();

    // While cell is alive, upgrade should succeed
    let upgraded = weak.upgrade();
    assert!(upgraded.is_some());
    assert_eq!(upgraded.unwrap().get(), 42);
}

#[test]
fn test_weak_cell_upgrade_fails_after_drop() {
    let weak = {
        let cell = Cell::new(42u64);
        cell.downgrade()
    }; // cell is dropped here

    // After cell is dropped, upgrade should fail
    assert!(weak.upgrade().is_none());
}

#[test]
fn test_weak_cell_clone() {
    let cell = Cell::new(42u64);
    let weak1 = cell.downgrade();
    let weak2 = weak1.clone();

    // Both should upgrade successfully
    assert!(weak1.upgrade().is_some());
    assert!(weak2.upgrade().is_some());

    drop(cell);

    // Both should fail after drop
    assert!(weak1.upgrade().is_none());
    assert!(weak2.upgrade().is_none());
}

// ============================================================================
// Disposal Behavior Tests
// ============================================================================

#[test]
fn test_derived_cell_drop_stops_notifications() {
    let source = Cell::new(0u64);
    let call_count = Arc::new(AtomicU64::new(0));

    {
        let count = call_count.clone();
        let _derived = source.map(move |v| {
            count.fetch_add(1, Ordering::SeqCst);
            *v * 2
        });

        // Map callback called once on creation
        assert_eq!(call_count.load(Ordering::SeqCst), 1);

        source.set(1);
        // Map callback called again
        assert_eq!(call_count.load(Ordering::SeqCst), 2);
    } // derived is dropped here

    // After dropping derived, setting source should NOT trigger the map callback
    source.set(2);
    assert_eq!(call_count.load(Ordering::SeqCst), 2); // Still 2, not incremented
}

#[test]
fn test_source_still_works_after_derived_dropped() {
    let source = Cell::new(0u64);
    let source_call_count = Arc::new(AtomicU64::new(0));

    // Add a direct watcher on source
    let count = source_call_count.clone();
    let _guard = source.subscribe(move |_| {
        count.fetch_add(1, Ordering::SeqCst);
    });

    {
        let _derived = source.map(|v| *v * 2);
        source.set(1);
    } // derived dropped

    // Source should still work for other watchers
    source.set(2);
    // Initial watch (0) + set(1) + set(2) = 3 calls
    assert_eq!(source_call_count.load(Ordering::SeqCst), 3);
}

#[test]
fn test_chained_operators_drop_correctly() {
    let source = Cell::new(0u64);
    let map1_count = Arc::new(AtomicU64::new(0));
    let map2_count = Arc::new(AtomicU64::new(0));

    let c1 = map1_count.clone();
    let c2 = map2_count.clone();

    {
        let _final = source
            .map(move |v| {
                c1.fetch_add(1, Ordering::SeqCst);
                *v * 2
            })
            .map(move |v| {
                c2.fetch_add(1, Ordering::SeqCst);
                *v + 1
            });

        // Both maps called once on creation
        assert_eq!(map1_count.load(Ordering::SeqCst), 1);
        assert_eq!(map2_count.load(Ordering::SeqCst), 1);

        source.set(1);
        assert_eq!(map1_count.load(Ordering::SeqCst), 2);
        assert_eq!(map2_count.load(Ordering::SeqCst), 2);
    } // both derived cells dropped

    source.set(2);
    // Neither map should be called anymore
    assert_eq!(map1_count.load(Ordering::SeqCst), 2);
    assert_eq!(map2_count.load(Ordering::SeqCst), 2);
}

#[test]
fn test_parent_cell_outlives_derived() {
    let received = Arc::new(AtomicU64::new(0));
    let r = received.clone();

    let source = Cell::new(0u64);
    let derived = source.map(|v| *v * 2);

    let _guard = derived.subscribe(move |signal| {
        if let Signal::Value(v) = signal {
            r.store(**v, Ordering::SeqCst);
        }
    });

    source.set(5);
    assert_eq!(received.load(Ordering::SeqCst), 10);

    // Derived still holds strong ref to source via dependencies,
    // so source stays alive even if we drop our reference
    drop(source);

    // derived should still have its value
    assert_eq!(derived.get(), 10);
}

// ============================================================================
// Subscription Cleanup Tests
// ============================================================================

#[test]
fn test_subscription_cleaned_up_on_derived_drop() {
    let source = Cell::new(0u64);

    // Check initial subscriber count
    let initial_count = source.inner.subscribers.len();

    {
        let _derived = source.map(|v| *v * 2);
        // map() creates one subscription on source
        assert_eq!(source.inner.subscribers.len(), initial_count + 1);
    } // derived dropped here - should unsubscribe

    // Subscription should be cleaned up
    assert_eq!(source.inner.subscribers.len(), initial_count);
}

#[test]
fn test_chained_subscriptions_cleaned_up() {
    let source = Cell::new(0u64);
    let initial_count = source.inner.subscribers.len();

    {
        let derived1 = source.map(|v| *v * 2);
        let d1_initial = derived1.inner.subscribers.len();

        {
            let _derived2 = derived1.map(|v| *v + 1);
            // derived2 subscribes to derived1
            assert_eq!(derived1.inner.subscribers.len(), d1_initial + 1);
        } // derived2 dropped

        // derived1 subscription should be cleaned up
        assert_eq!(derived1.inner.subscribers.len(), d1_initial);
    } // derived1 dropped

    // source subscription should be cleaned up
    assert_eq!(source.inner.subscribers.len(), initial_count);
}

#[test]
fn test_multiple_derived_cells_independent_cleanup() {
    let source = Cell::new(0u64);
    let initial_count = source.inner.subscribers.len();

    let derived1 = source.map(|v| *v * 2);
    assert_eq!(source.inner.subscribers.len(), initial_count + 1);

    let derived2 = source.map(|v| *v + 1);
    assert_eq!(source.inner.subscribers.len(), initial_count + 2);

    drop(derived1);
    // Only derived1's subscription should be cleaned up
    assert_eq!(source.inner.subscribers.len(), initial_count + 1);

    drop(derived2);
    // Now both should be cleaned up
    assert_eq!(source.inner.subscribers.len(), initial_count);
}