forked from alibaba/coobjc
-
Notifications
You must be signed in to change notification settings - Fork 0
/
coswift.swift
136 lines (117 loc) · 3.92 KB
/
coswift.swift
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
//
// Api.swift
// coswift
//
// Copyright © 2018 Alibaba Group Holding Limited All rights reserved.
//
// 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.
import Foundation
/// Launch a coroutine running on queue, and special the stack size
/// of the coroutine.
///
/// - Parameters:
/// - queue: the `dispatch_queue_t` of coroutine's code running.
/// - stackSize: the custom stack size of coroutine
/// - block: the coroutine's body code
/// - Returns: the coroutine object
@discardableResult
public func co_launch(queue: DispatchQueue? = nil, stackSize: UInt32? = nil, block: @escaping () throws -> Void) -> Coroutine {
let co = Coroutine(block: block, on: queue, stackSize: stackSize)
return co.resume()
}
/// Await a promise object
///
/// - Parameter promise: The Promise object
/// - Returns: the promise's resolution
/// - Throws: COError type
///
/// Examples:
/// let resolution = await(somePromise)
/// switch result {
/// case .fulfilled(let val):
/// // the promise fulfilled
/// break
/// case .rejected(let error):
/// // the promise reject
/// break
/// }
public func await<T>(promise: Promise<T>) throws -> Resolution<T> {
if let _ = Coroutine.current() {
let chan = Chan<Resolution<T>>(buffCount: 1)
promise.then(work: { (value) -> Any in
chan.send_nonblock(val: Resolution<T>.fulfilled(value))
}).catch { (error) in
if let err = error as? COError, err == .promiseCancelled {
} else {
chan.send_nonblock(val: Resolution<T>.rejected(error))
}
}
return try chan.receive(onCancel: { (channel) in
promise.cancel()
})
} else {
throw COError.invalidCoroutine
}
}
/// A Convenience use of await
///
/// - Parameter closure: return a Promise object
/// - Returns: the promise's resolution
/// - Throws: COError
public func await<T>(closure: @escaping () -> Promise<T> ) throws -> Resolution<T> {
return try await(promise: closure())
}
/// Await a channel object, blocking current process, wait the channel send something.
///
/// - Parameter channel: the Chan object
/// - Returns: The value passing to channel
/// - Throws: COError
public func await<T>(channel: Chan<T>) throws -> T {
if let _ = Coroutine.current() {
return try channel.receive()
} else {
throw COError.invalidCoroutine
}
}
/// A Convenience use of await a channel
///
/// - Parameter closure: return a Promise object
/// - Returns: the promise's resolution
/// - Throws: COError
public func await<T>(closure: @escaping () -> Chan<T> ) throws -> T {
return try await(channel: closure())
}
/// Check current coroutine is active or not.
public var co_isActive: Bool {
get {
return Coroutine.isActive()
}
}
/// co_delay, pause current coroutine seconds.
///
/// - Parameter seconds: paused time
/// - Throws: If coroutine cancel, throws.
public func co_delay(_ seconds: TimeInterval) throws {
let chan = Chan<Int>()
let queue = co_get_current_queue()
let timer = DispatchSource.makeTimerSource(queue: queue)
timer.setEventHandler {
timer.cancel()
chan.send_nonblock(val: 1)
}
timer.schedule(deadline: .now() + seconds, repeating: .never)
timer.resume()
try _ = chan.receive(onCancel: { _ in
timer.cancel()
})
}