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
#![deny(missing_docs)]
pub use storage::RBError as EventError;
pub use storage::ReaderId;
use storage::{RingBufferStorage, StorageIterator};
mod storage;
pub trait Event: Send + Sync + 'static {}
impl<T> Event for T
where
T: Send + Sync + 'static,
{
}
const DEFAULT_MAX_SIZE: usize = 200;
pub struct EventHandler<E> {
storage: RingBufferStorage<E>,
}
impl<E> EventHandler<E>
where
E: Event,
{
pub fn new() -> Self {
Self::with_capacity(DEFAULT_MAX_SIZE)
}
pub fn with_capacity(size: usize) -> Self {
Self {
storage: RingBufferStorage::new(size),
}
}
pub fn register_reader(&mut self) -> ReaderId {
self.storage.new_reader_id()
}
pub fn write(&mut self, events: &mut Vec<E>) -> Result<(), EventError<E>> {
if events.len() == 0 {
return Ok(());
}
self.storage.write(events)
}
pub fn write_single(&mut self, event: E) {
self.storage.write_single(event);
}
pub fn read(&self, reader_id: &mut ReaderId) -> Result<StorageIterator<E>, EventError<E>> {
self.storage.read(reader_id)
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::any::TypeId;
#[derive(Debug, Clone, PartialEq)]
struct Test {
pub id: u32,
}
#[test]
fn test_register_reader() {
let mut handler = EventHandler::<Test>::with_capacity(14);
let reader_id = handler.register_reader();
assert_eq!(ReaderId::new(TypeId::of::<Test>(), 1, 0, 0), reader_id);
}
#[test]
fn test_read_write() {
let mut handler = EventHandler::with_capacity(14);
let mut reader_id = handler.register_reader();
let mut reader_id_extra = handler.register_reader();
handler.write_single(Test { id: 1 });
assert_eq!(
vec![Test { id: 1 }],
handler
.read(&mut reader_id)
.unwrap()
.cloned()
.collect::<Vec<_>>()
);
handler.write_single(Test { id: 2 });
assert_eq!(
vec![Test { id: 2 }],
handler
.read(&mut reader_id)
.unwrap()
.cloned()
.collect::<Vec<_>>()
);
assert_eq!(
vec![Test { id: 1 }, Test { id: 2 }],
handler
.read(&mut reader_id_extra)
.unwrap()
.cloned()
.collect::<Vec<_>>()
);
handler.write_single(Test { id: 3 });
assert_eq!(
vec![Test { id: 3 }],
handler
.read(&mut reader_id)
.unwrap()
.cloned()
.collect::<Vec<_>>()
);
assert_eq!(
vec![Test { id: 3 }],
handler
.read(&mut reader_id_extra)
.unwrap()
.cloned()
.collect::<Vec<_>>()
);
}
}