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
use crate::BoxFuture;
use futures::future::{Future, FutureExt};
pub struct Command<T> {
futures: Vec<BoxFuture<T>>,
}
impl<T> Command<T> {
pub fn none() -> Self {
Self {
futures: Vec::new(),
}
}
#[cfg(not(target_arch = "wasm32"))]
pub fn perform<A>(
future: impl Future<Output = T> + 'static + Send,
f: impl Fn(T) -> A + 'static + Send,
) -> Command<A> {
Command {
futures: vec![Box::pin(future.map(f))],
}
}
#[cfg(target_arch = "wasm32")]
pub fn perform<A>(
future: impl Future<Output = T> + 'static,
f: impl Fn(T) -> A + 'static + Send,
) -> Command<A> {
Command {
futures: vec![Box::pin(future.map(f))],
}
}
#[cfg(not(target_arch = "wasm32"))]
pub fn map<A>(
mut self,
f: impl Fn(T) -> A + 'static + Send + Sync,
) -> Command<A>
where
T: 'static,
{
let f = std::sync::Arc::new(f);
Command {
futures: self
.futures
.drain(..)
.map(|future| {
let f = f.clone();
Box::pin(future.map(move |result| f(result)))
as BoxFuture<A>
})
.collect(),
}
}
#[cfg(target_arch = "wasm32")]
pub fn map<A>(mut self, f: impl Fn(T) -> A + 'static) -> Command<A>
where
T: 'static,
{
let f = std::rc::Rc::new(f);
Command {
futures: self
.futures
.drain(..)
.map(|future| {
let f = f.clone();
Box::pin(future.map(move |result| f(result)))
as BoxFuture<A>
})
.collect(),
}
}
pub fn batch(commands: impl IntoIterator<Item = Command<T>>) -> Self {
Self {
futures: commands
.into_iter()
.flat_map(|command| command.futures)
.collect(),
}
}
pub fn futures(self) -> Vec<BoxFuture<T>> {
self.futures
}
}
#[cfg(not(target_arch = "wasm32"))]
impl<T, A> From<A> for Command<T>
where
A: Future<Output = T> + 'static + Send,
{
fn from(future: A) -> Self {
Self {
futures: vec![future.boxed()],
}
}
}
#[cfg(target_arch = "wasm32")]
impl<T, A> From<A> for Command<T>
where
A: Future<Output = T> + 'static,
{
fn from(future: A) -> Self {
Self {
futures: vec![future.boxed_local()],
}
}
}
impl<T> std::fmt::Debug for Command<T> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("Command").finish()
}
}