shared-container 0.3.0

A unified abstraction for shared data access in both multi-threaded and single-threaded environments
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

#![cfg(any(feature = "wasm-sync", feature = "force-wasm-impl"))]

use shared_container::SharedContainer;

#[derive(Debug, Clone, PartialEq)]
struct TestStruct {
    value: i32,
}

#[test]
fn test_wasm_read_access() {
    let container = SharedContainer::new(TestStruct { value: 42 });

    // Read access
    let guard = container.read().unwrap();
    assert_eq!(guard.value, 42);
}

#[test]
fn test_wasm_write_access() {
    let container = SharedContainer::new(TestStruct { value: 42 });

    // Write access
    {
        let mut guard = container.write().unwrap();
        guard.value = 100;
    }

    // Verify change
    let guard = container.read().unwrap();
    assert_eq!(guard.value, 100);
}

#[test]
fn test_wasm_borrow_conflict() {
    let container = SharedContainer::new(TestStruct { value: 42 });

    // Get a read borrow
    let _guard = container.read().unwrap();

    // Trying to get a write borrow while a read borrow exists should fail
    assert!(container.write().is_none());
}

#[test]
fn test_wasm_multiple_reads() {
    let container = SharedContainer::new(TestStruct { value: 42 });

    // Multiple read borrows should work
    let _guard1 = container.read().unwrap();
    let guard2 = container.read().unwrap();

    assert_eq!(guard2.value, 42);
}

#[test]
fn test_wasm_weak_ref() {
    let container = SharedContainer::new(TestStruct { value: 42 });
    let weak = container.downgrade();

    // Upgrade should work
    let container2 = weak.upgrade().unwrap();
    assert_eq!(container2.read().unwrap().value, 42);

    // After dropping all strong references, upgrade should fail
    drop(container);
    drop(container2);
    assert!(weak.upgrade().is_none());
}

#[test]
fn test_wasm_clone_container() {
    let container1 = SharedContainer::new(TestStruct { value: 42 });
    let container2 = container1.clone();

    // Modify through container2
    {
        let mut guard = container2.write().unwrap();
        guard.value = 100;
    }

    // Verify change visible through container1
    let guard = container1.read().unwrap();
    assert_eq!(guard.value, 100);
}

#[test]
fn test_wasm_get_cloned() {
    let container = SharedContainer::new(TestStruct { value: 42 });
    let cloned = container.get_cloned().unwrap();
    assert_eq!(cloned, TestStruct { value: 42 });

    // Modify original
    {
        let mut guard = container.write().unwrap();
        guard.value = 100;
    }

    // Cloned value should not change
    assert_eq!(cloned, TestStruct { value: 42 });

    // And we can get a new clone with updated value
    let new_clone = container.get_cloned().unwrap();
    assert_eq!(new_clone, TestStruct { value: 100 });
}

#[test]
fn test_wasm_weak_clone() {
    let container = SharedContainer::new(TestStruct { value: 42 });

    // Create a weak reference and clone it
    let weak1 = container.downgrade();
    let weak2 = weak1.clone();

    // Both weak references can be upgraded
    let container1 = weak1.upgrade().unwrap();
    let container2 = weak2.upgrade().unwrap();

    // Modify through container2
    {
        let mut guard = container2.write().unwrap();
        guard.value = 100;
    }

    // Change visible through container1
    {
        let guard = container1.read().unwrap();
        assert_eq!(guard.value, 100);
    }

    // Drop all strong references
    drop(container);
    drop(container1);
    drop(container2);

    // Neither weak reference can be upgraded
    assert!(weak1.upgrade().is_none());
    assert!(weak2.upgrade().is_none());
}

#[test]
fn test_wasm_partial_eq() {
    let container1 = SharedContainer::new(TestStruct { value: 42 });
    let container2 = container1.clone();
    let container3 = SharedContainer::new(TestStruct { value: 100 });

    assert_eq!(container1, container2);
    assert_ne!(container1, container3);
}

#[test]
fn test_wasm_write_conflict() {
    let container = SharedContainer::new(TestStruct { value: 42 });

    // Get a write borrow
    let _guard = container.write().unwrap();

    // Trying to get another write borrow should fail
    assert!(container.write().is_none());

    // Trying to get a read borrow should also fail
    assert!(container.read().is_none());
}