-
Notifications
You must be signed in to change notification settings - Fork 511
/
Async.scala
43 lines (39 loc) · 1.4 KB
/
Async.scala
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
/*
* Copyright 2017 Typelevel
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cats
package effect
import simulacrum._
import scala.annotation.implicitNotFound
import scala.util.Either
/**
* A monad that can describe asynchronous or synchronous computations that
* produce exactly one result.
*/
@typeclass
@implicitNotFound("""Cannot find implicit value for Async[${F}].
Building this implicit value might depend on having an implicit
s.c.ExecutionContext in scope, a Strategy or some equivalent type.""")
trait Async[F[_]] extends Sync[F] {
/**
* Creates an `F[A]` instance from a provided function
* that will have a callback injected for signaling the
* final result of an asynchronous process.
*
* @param k is a function that should be called with a
* callback for signaling the result once it is ready
*/
def async[A](k: (Either[Throwable, A] => Unit) => Unit): F[A]
}