|
1 | NO CONTENT: new file 100644, binary diff hidden |
@@ -0,0 +1,28 | |||
|
1 | using System; | |
|
2 | using System.Threading; | |
|
3 | ||
|
4 | namespace Implab.Parallels { | |
|
5 | /// <summary> | |
|
6 | /// Класс для распаралеливания задач. | |
|
7 | /// </summary> | |
|
8 | /// <remarks> | |
|
9 | /// Используя данный класс и лямда выражения можно распараллелить | |
|
10 | /// вычисления, для этого используется концепция обещаний. | |
|
11 | /// </remarks> | |
|
12 | public static class AsyncPool { | |
|
13 | ||
|
14 | public static Promise<T> Invoke<T>(Func<T> func) { | |
|
15 | var p = new Promise<T>(); | |
|
16 | ||
|
17 | ThreadPool.QueueUserWorkItem(param => { | |
|
18 | try { | |
|
19 | p.Resolve(func()); | |
|
20 | } catch(Exception e) { | |
|
21 | p.Reject(e); | |
|
22 | } | |
|
23 | }); | |
|
24 | ||
|
25 | return p; | |
|
26 | } | |
|
27 | } | |
|
28 | } |
@@ -1,127 +1,139 | |||
|
1 | 1 | using System; |
|
2 | 2 | using Microsoft.VisualStudio.TestTools.UnitTesting; |
|
3 | 3 | using System.Reflection; |
|
4 | 4 | using System.Threading; |
|
5 | using Implab.Parallels; | |
|
5 | 6 | |
|
6 | 7 | namespace Implab.Test |
|
7 | 8 | { |
|
8 | 9 | [TestClass] |
|
9 | 10 | public class AsyncTests |
|
10 | 11 | { |
|
11 | 12 | [TestMethod] |
|
12 | 13 | public void ResolveTest () |
|
13 | 14 | { |
|
14 | 15 | int res = -1; |
|
15 | 16 | var p = new Promise<int> (); |
|
16 | 17 | p.Then (x => res = x); |
|
17 | 18 | p.Resolve (100); |
|
18 | 19 | |
|
19 | 20 | Assert.AreEqual (res, 100); |
|
20 | 21 | } |
|
21 | 22 | |
|
22 | 23 | [TestMethod] |
|
23 | 24 | public void RejectTest () |
|
24 | 25 | { |
|
25 | 26 | int res = -1; |
|
26 | 27 | Exception err = null; |
|
27 | 28 | |
|
28 | 29 | var p = new Promise<int> (); |
|
29 | 30 | p.Then (x => res = x, e => err = e); |
|
30 | 31 | p.Reject (new ApplicationException ("error")); |
|
31 | 32 | |
|
32 | 33 | Assert.AreEqual (res, -1); |
|
33 | 34 | Assert.AreEqual (err.Message, "error"); |
|
34 | 35 | |
|
35 | 36 | } |
|
36 | 37 | |
|
37 | 38 | [TestMethod] |
|
38 | 39 | public void JoinSuccessTest () |
|
39 | 40 | { |
|
40 | 41 | var p = new Promise<int> (); |
|
41 | 42 | p.Resolve (100); |
|
42 | 43 | Assert.AreEqual (p.Join (), 100); |
|
43 | 44 | } |
|
44 | 45 | |
|
45 | 46 | [TestMethod] |
|
46 | 47 | public void JoinFailTest () |
|
47 | 48 | { |
|
48 | 49 | var p = new Promise<int> (); |
|
49 | 50 | p.Reject (new ApplicationException ("failed")); |
|
50 | 51 | |
|
51 | 52 | try { |
|
52 | 53 | p.Join (); |
|
53 | 54 | throw new ApplicationException ("WRONG!"); |
|
54 | 55 | } catch (TargetInvocationException err) { |
|
55 | 56 | Assert.AreEqual (err.InnerException.Message, "failed"); |
|
56 | 57 | } catch { |
|
57 | 58 | Assert.Fail ("Got wrong excaption"); |
|
58 | 59 | } |
|
59 | 60 | } |
|
60 | 61 | |
|
61 | 62 | [TestMethod] |
|
62 | 63 | public void MapTest () |
|
63 | 64 | { |
|
64 | 65 | var p = new Promise<int> (); |
|
65 | 66 | |
|
66 | 67 | var p2 = p.Map (x => x.ToString ()); |
|
67 | 68 | p.Resolve (100); |
|
68 | 69 | |
|
69 | 70 | Assert.AreEqual (p2.Join (), "100"); |
|
70 | 71 | } |
|
71 | 72 | |
|
72 | 73 | [TestMethod] |
|
74 | public void FixErrorTest() { | |
|
75 | var p = new Promise<int>(); | |
|
76 | ||
|
77 | var p2 = p.Error(e => 101); | |
|
78 | ||
|
79 | p.Reject(new Exception()); | |
|
80 | ||
|
81 | Assert.AreEqual(p2.Join(), 101); | |
|
82 | } | |
|
83 | ||
|
84 | [TestMethod] | |
|
73 | 85 | public void ChainTest () |
|
74 | 86 | { |
|
75 | 87 | var p1 = new Promise<int> (); |
|
76 | 88 | |
|
77 | 89 | var p3 = p1.Chain (x => { |
|
78 | 90 | var p2 = new Promise<string> (); |
|
79 | 91 | p2.Resolve (x.ToString ()); |
|
80 | 92 | return p2; |
|
81 | 93 | }); |
|
82 | 94 | |
|
83 | 95 | p1.Resolve (100); |
|
84 | 96 | |
|
85 | 97 | Assert.AreEqual (p3.Join (), "100"); |
|
86 | 98 | } |
|
87 | 99 | |
|
88 | 100 | [TestMethod] |
|
89 | 101 | public void PoolTest () |
|
90 | 102 | { |
|
91 | 103 | var pid = Thread.CurrentThread.ManagedThreadId; |
|
92 | 104 | var p = AsyncPool.Invoke (() => Thread.CurrentThread.ManagedThreadId); |
|
93 | 105 | |
|
94 | 106 | Assert.AreNotEqual (pid, p.Join ()); |
|
95 | 107 | } |
|
96 | 108 | |
|
97 | 109 | [TestMethod] |
|
98 | 110 | public void ComplexCase1Test() { |
|
99 | 111 | var flags = new bool[3]; |
|
100 | 112 | |
|
101 | 113 | // op1 (aync 200ms) => op2 (async 200ms) => op3 (sync map) |
|
102 | 114 | |
|
103 | 115 | var p = PromiseHelper |
|
104 | 116 | .Sleep(200, "Alan") |
|
105 | 117 | .Cancelled(() => flags[0] = true) |
|
106 | 118 | .Chain(x => |
|
107 | 119 | PromiseHelper |
|
108 | 120 | .Sleep(200, "Hi, " + x) |
|
109 | 121 | .Map( y => y ) |
|
110 | 122 | .Cancelled(() => flags[1] = true) |
|
111 | 123 | ) |
|
112 | 124 | .Cancelled(() => flags[2] = true); |
|
113 | 125 | Thread.Sleep(300); |
|
114 | 126 | p.Cancel(); |
|
115 | 127 | try { |
|
116 | 128 | Assert.AreEqual(p.Join(), "Hi, Alan"); |
|
117 | 129 | Assert.Fail("Shouldn't get here"); |
|
118 | 130 | } catch(OperationCanceledException) { |
|
119 | 131 | } |
|
120 | 132 | |
|
121 | 133 | Assert.IsFalse(flags[0]); |
|
122 | 134 | Assert.IsTrue(flags[1]); |
|
123 | 135 | Assert.IsTrue(flags[2]); |
|
124 | 136 | } |
|
125 | 137 | } |
|
126 | 138 | } |
|
127 | 139 |
@@ -1,16 +1,17 | |||
|
1 | using System; | |
|
1 | using Implab.Parallels; | |
|
2 | using System; | |
|
2 | 3 | using System.Collections.Generic; |
|
3 | 4 | using System.Linq; |
|
4 | 5 | using System.Text; |
|
5 | 6 | using System.Threading; |
|
6 | 7 | |
|
7 | 8 | namespace Implab.Test { |
|
8 | 9 | class PromiseHelper { |
|
9 | 10 | public static Promise<T> Sleep<T>(int timeout, T retVal) { |
|
10 | 11 | return AsyncPool.Invoke(() => { |
|
11 | 12 | Thread.Sleep(timeout); |
|
12 | 13 | return retVal; |
|
13 | 14 | }); |
|
14 | 15 | } |
|
15 | 16 | } |
|
16 | 17 | } |
@@ -1,40 +1,39 | |||
|
1 | 1 | using System; |
|
2 | 2 | using System.Collections.Generic; |
|
3 | 3 | using System.Linq; |
|
4 | 4 | using System.Text; |
|
5 | 5 | |
|
6 | 6 | namespace Implab |
|
7 | 7 | { |
|
8 | 8 | public interface IPromise |
|
9 | 9 | { |
|
10 | 10 | /// <summary> |
|
11 | 11 | /// Check whereather the promise has no more than one dependent promise. |
|
12 | 12 | /// </summary> |
|
13 | 13 | bool IsExclusive |
|
14 | 14 | { |
|
15 | 15 | get; |
|
16 | 16 | } |
|
17 | 17 | |
|
18 | 18 | /// <summary> |
|
19 | 19 | /// The current state of the promise. |
|
20 | 20 | /// </summary> |
|
21 | 21 | PromiseState State |
|
22 | 22 | { |
|
23 | 23 | get; |
|
24 | 24 | } |
|
25 | 25 | |
|
26 | 26 | /// <summary> |
|
27 |
/// Tries to cancel the |
|
|
27 | /// Tries to cancel the the complete chain of promises. | |
|
28 | 28 | /// </summary> |
|
29 | /// <param name="dependencies">Try to cancel the whole promise chain, the parent promise will be cancelled only if it has only one promise</param> | |
|
30 | /// <returns></returns> | |
|
31 | bool Cancel(bool dependencies); | |
|
29 | /// <returns><c>true</c> - if the promise has been cancelled, otherwise the promise will be resolved (or resolved already).</returns> | |
|
30 | bool Cancel(); | |
|
32 | 31 | |
|
33 | 32 | /// <summary> |
|
34 | 33 | /// Registers handler for the case when the promise is cencelled. If the promise already cancelled the |
|
35 | 34 | /// handler will be invoked immediatelly. |
|
36 | 35 | /// </summary> |
|
37 | 36 | /// <param name="handler">The handler</param> |
|
38 | 37 | void HandleCancelled(Action handler); |
|
39 | 38 | } |
|
40 | 39 | } |
@@ -1,49 +1,47 | |||
|
1 | 1 | <?xml version="1.0" encoding="utf-8"?> |
|
2 | 2 | <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> |
|
3 | 3 | <PropertyGroup> |
|
4 | 4 | <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration> |
|
5 | 5 | <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform> |
|
6 | 6 | <ProductVersion>10.0.0</ProductVersion> |
|
7 | 7 | <SchemaVersion>2.0</SchemaVersion> |
|
8 | 8 | <ProjectGuid>{F550F1F8-8746-4AD0-9614-855F4C4B7F05}</ProjectGuid> |
|
9 | 9 | <OutputType>Library</OutputType> |
|
10 | 10 | <RootNamespace>Implab</RootNamespace> |
|
11 | 11 | <AssemblyName>Implab</AssemblyName> |
|
12 | 12 | </PropertyGroup> |
|
13 | 13 | <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "> |
|
14 | 14 | <DebugSymbols>true</DebugSymbols> |
|
15 | 15 | <DebugType>full</DebugType> |
|
16 | 16 | <Optimize>false</Optimize> |
|
17 | 17 | <OutputPath>bin\Debug</OutputPath> |
|
18 | 18 | <DefineConstants>DEBUG;</DefineConstants> |
|
19 | 19 | <ErrorReport>prompt</ErrorReport> |
|
20 | 20 | <WarningLevel>4</WarningLevel> |
|
21 | 21 | <ConsolePause>false</ConsolePause> |
|
22 | 22 | </PropertyGroup> |
|
23 | 23 | <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' "> |
|
24 | 24 | <DebugType>full</DebugType> |
|
25 | 25 | <Optimize>true</Optimize> |
|
26 | 26 | <OutputPath>bin\Release</OutputPath> |
|
27 | 27 | <ErrorReport>prompt</ErrorReport> |
|
28 | 28 | <WarningLevel>4</WarningLevel> |
|
29 | 29 | <ConsolePause>false</ConsolePause> |
|
30 | 30 | </PropertyGroup> |
|
31 | 31 | <ItemGroup> |
|
32 | 32 | <Reference Include="System" /> |
|
33 | 33 | </ItemGroup> |
|
34 | 34 | <ItemGroup> |
|
35 | 35 | <Compile Include="IPromise.cs" /> |
|
36 | 36 | <Compile Include="PromiseState.cs" /> |
|
37 | 37 | <Compile Include="TaskController.cs" /> |
|
38 | 38 | <Compile Include="ProgressInitEventArgs.cs" /> |
|
39 | 39 | <Compile Include="Properties\AssemblyInfo.cs" /> |
|
40 | 40 | <Compile Include="Promise.cs" /> |
|
41 | <Compile Include="AsyncPool.cs" /> | |
|
41 | <Compile Include="Parallels\AsyncPool.cs" /> | |
|
42 | 42 | <Compile Include="Safe.cs" /> |
|
43 | 43 | <Compile Include="ValueEventArgs.cs" /> |
|
44 | 44 | </ItemGroup> |
|
45 | 45 | <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" /> |
|
46 | <ItemGroup> | |
|
47 | <Folder Include="Parallels\" /> | |
|
48 | </ItemGroup> | |
|
46 | <ItemGroup /> | |
|
49 | 47 | </Project> No newline at end of file |
@@ -1,459 +1,543 | |||
|
1 | 1 | using System; |
|
2 | 2 | using System.Collections.Generic; |
|
3 | 3 | using System.Reflection; |
|
4 | 4 | using System.Diagnostics; |
|
5 | 5 | using System.Threading; |
|
6 | 6 | |
|
7 | 7 | namespace Implab { |
|
8 | 8 | |
|
9 | 9 | public delegate void ErrorHandler(Exception e); |
|
10 | ||
|
10 | public delegate T ErrorHandler<out T>(Exception e); | |
|
11 | 11 | public delegate void ResultHandler<in T>(T result); |
|
12 | 12 | public delegate TNew ResultMapper<in TSrc, out TNew>(TSrc result); |
|
13 | 13 | public delegate Promise<TNew> ChainedOperation<in TSrc, TNew>(TSrc result); |
|
14 | 14 | |
|
15 | 15 | /// <summary> |
|
16 | 16 | /// Класс для асинхронного получения результатов. Так называемое "обещание". |
|
17 | 17 | /// </summary> |
|
18 | 18 | /// <typeparam name="T">Тип получаемого результата</typeparam> |
|
19 | 19 | /// <remarks> |
|
20 | 20 | /// <para>Сервис при обращении к его методу дает обещаиние о выполнении операции, |
|
21 | 21 | /// клиент получив такое обещание может установить ряд обратных вызово для получения |
|
22 | 22 | /// событий выполнения обещания, тоесть завершения операции и предоставлении результатов.</para> |
|
23 | 23 | /// <para> |
|
24 | 24 | /// Обещение может быть как выполнено, так и выполнено с ошибкой. Для подписки на |
|
25 | 25 | /// данные события клиент должен использовать методы <c>Then</c>. |
|
26 | 26 | /// </para> |
|
27 | 27 | /// <para> |
|
28 | 28 | /// Сервис, в свою очередь, по окончанию выполнения операции (возможно с ошибкой), |
|
29 | 29 | /// использует методы <c>Resolve</c> либо <c>Reject</c> для оповещения клиетна о |
|
30 | 30 | /// выполнении обещания. |
|
31 | 31 | /// </para> |
|
32 | 32 | /// <para> |
|
33 | 33 | /// Если сервер успел выполнить обещание еще до того, как клиент на него подписался, |
|
34 | 34 | /// то в момент подписки клиента будут вызваны соответсвующие события в синхронном |
|
35 | 35 | /// режиме и клиент будет оповещен в любом случае. Иначе, обработчики добавляются в |
|
36 | 36 | /// список в порядке подписания и в этом же порядке они будут вызваны при выполнении |
|
37 | 37 | /// обещания. |
|
38 | 38 | /// </para> |
|
39 | 39 | /// <para> |
|
40 | 40 | /// Обрабатывая результаты обещания можно преобразовывать результаты либо инициировать |
|
41 | 41 | /// связанные асинхронные операции, которые также возвращают обещания. Для этого следует |
|
42 | 42 | /// использовать соответствующую форму методе <c>Then</c>. |
|
43 | 43 | /// </para> |
|
44 | 44 | /// <para> |
|
45 | 45 | /// Также хорошим правилом является то, что <c>Resolve</c> и <c>Reject</c> должен вызывать |
|
46 | 46 | /// только инициатор обещания иначе могут возникнуть противоречия. |
|
47 | 47 | /// </para> |
|
48 | 48 | /// </remarks> |
|
49 | 49 | public class Promise<T> : IPromise { |
|
50 | 50 | |
|
51 | 51 | struct ResultHandlerInfo { |
|
52 | 52 | public ResultHandler<T> resultHandler; |
|
53 | 53 | public ErrorHandler errorHandler; |
|
54 | 54 | } |
|
55 | 55 | |
|
56 | 56 | readonly IPromise m_parent; |
|
57 | 57 | |
|
58 | 58 | LinkedList<ResultHandlerInfo> m_resultHandlers = new LinkedList<ResultHandlerInfo>(); |
|
59 | 59 | LinkedList<Action> m_cancelHandlers = new LinkedList<Action>(); |
|
60 | 60 | |
|
61 | 61 | readonly object m_lock = new Object(); |
|
62 | 62 | readonly bool m_cancellable; |
|
63 | 63 | int m_childrenCount = 0; |
|
64 | 64 | |
|
65 | 65 | PromiseState m_state; |
|
66 | 66 | T m_result; |
|
67 | 67 | Exception m_error; |
|
68 | 68 | |
|
69 | 69 | public Promise() { |
|
70 | 70 | m_cancellable = true; |
|
71 | 71 | } |
|
72 | 72 | |
|
73 | 73 | public Promise(IPromise parent, bool cancellable) { |
|
74 | 74 | m_cancellable = cancellable; |
|
75 | 75 | m_parent = parent; |
|
76 | 76 | if (parent != null) |
|
77 | 77 | parent.HandleCancelled(InternalCancel); |
|
78 | 78 | } |
|
79 | 79 | |
|
80 | 80 | void InternalCancel() { |
|
81 | 81 | // don't try to cancel parent :) |
|
82 | 82 | Cancel(false); |
|
83 | 83 | } |
|
84 | 84 | |
|
85 | 85 | /// <summary> |
|
86 | 86 | /// Выполняет обещание, сообщая об успешном выполнении. |
|
87 | 87 | /// </summary> |
|
88 | 88 | /// <param name="result">Результат выполнения.</param> |
|
89 | 89 | /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception> |
|
90 | 90 | public void Resolve(T result) { |
|
91 | 91 | lock (this) { |
|
92 | 92 | if (m_state == PromiseState.Cancelled) |
|
93 | 93 | return; |
|
94 | 94 | if (m_state != PromiseState.Unresolved) |
|
95 | 95 | throw new InvalidOperationException("The promise is already resolved"); |
|
96 | 96 | m_result = result; |
|
97 | 97 | m_state = PromiseState.Resolved; |
|
98 | 98 | } |
|
99 | 99 | |
|
100 | 100 | OnStateChanged(); |
|
101 | 101 | } |
|
102 | 102 | |
|
103 | 103 | /// <summary> |
|
104 | 104 | /// Выполняет обещание, сообщая об ошибке |
|
105 | 105 | /// </summary> |
|
106 | 106 | /// <param name="error">Исключение возникшее при выполнении операции</param> |
|
107 | 107 | /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception> |
|
108 | 108 | public void Reject(Exception error) { |
|
109 | 109 | lock (this) { |
|
110 | 110 | if (m_state == PromiseState.Cancelled) |
|
111 | 111 | return; |
|
112 | 112 | if (m_state != PromiseState.Unresolved) |
|
113 | 113 | throw new InvalidOperationException("The promise is already resolved"); |
|
114 | 114 | m_error = error; |
|
115 | 115 | m_state = PromiseState.Rejected; |
|
116 | 116 | } |
|
117 | 117 | |
|
118 | 118 | OnStateChanged(); |
|
119 | 119 | } |
|
120 | 120 | |
|
121 | 121 | /// <summary> |
|
122 | 122 | /// Отменяет операцию, если это возможно. |
|
123 | 123 | /// </summary> |
|
124 | 124 | /// <returns><c>true</c> Операция была отменена, обработчики не будут вызваны.<c>false</c> отмена не возможна, поскольку обещание уже выполнено и обработчики отработали.</returns> |
|
125 | 125 | public bool Cancel() { |
|
126 | 126 | return Cancel(true); |
|
127 | 127 | } |
|
128 | 128 | |
|
129 | protected virtual void OnStateChanged() { | |
|
130 | switch (m_state) { | |
|
131 | case PromiseState.Resolved: | |
|
132 | foreach (var resultHandlerInfo in m_resultHandlers) | |
|
133 | try { | |
|
134 | if (resultHandlerInfo.resultHandler != null) | |
|
135 | resultHandlerInfo.resultHandler(m_result); | |
|
136 | } catch (Exception e) { | |
|
137 | try { | |
|
138 | if (resultHandlerInfo.errorHandler != null) | |
|
139 | resultHandlerInfo.errorHandler(e); | |
|
140 | } catch { } | |
|
141 | } | |
|
142 | break; | |
|
143 | case PromiseState.Cancelled: | |
|
144 | foreach (var cancelHandler in m_cancelHandlers) | |
|
145 | cancelHandler(); | |
|
146 | break; | |
|
147 | case PromiseState.Rejected: | |
|
148 | foreach (var resultHandlerInfo in m_resultHandlers) | |
|
149 | try { | |
|
150 | if (resultHandlerInfo.errorHandler != null) | |
|
151 | resultHandlerInfo.errorHandler(m_error); | |
|
152 | } catch { } | |
|
153 | break; | |
|
154 | default: | |
|
155 | throw new InvalidOperationException(String.Format("Promise entered an invalid state {0}", m_state)); | |
|
156 | } | |
|
157 | ||
|
158 | m_resultHandlers = null; | |
|
159 | m_cancelHandlers = null; | |
|
160 | } | |
|
161 | ||
|
162 | 129 | /// <summary> |
|
163 | /// Добавляет обработчики событий выполнения обещания. | |
|
130 | /// Adds new handlers to this promise. | |
|
164 | 131 | /// </summary> |
|
165 | /// <param name="success">Обработчик успешного выполнения обещания. | |
|
166 | /// Данному обработчику будет передан результат выполнения операции.</param> | |
|
167 | /// <param name="error">Обработчик ошибки. Данный обработчик получит | |
|
168 | /// исключение возникшее при выполнении операции.</param> | |
|
169 | /// <returns>Само обещание</returns> | |
|
132 | /// <param name="success">The handler of the successfully completed operation. | |
|
133 | /// This handler will recieve an operation result as a parameter.</param> | |
|
134 | /// <param name="error">Handles an exception that may occur during the operation.</param> | |
|
135 | /// <returns>The new promise chained to this one.</returns> | |
|
170 | 136 | public Promise<T> Then(ResultHandler<T> success, ErrorHandler error) { |
|
171 | 137 | if (success == null && error == null) |
|
172 | 138 | return this; |
|
173 | 139 | |
|
174 | var medium = new Promise<T>(); | |
|
140 | var medium = new Promise<T>(this, true); | |
|
175 | 141 | |
|
176 | 142 | var handlerInfo = new ResultHandlerInfo(); |
|
177 | 143 | |
|
178 | 144 | if (success != null) |
|
179 | 145 | handlerInfo.resultHandler = x => { |
|
180 | 146 | success(x); |
|
181 | 147 | medium.Resolve(x); |
|
182 | 148 | }; |
|
183 | 149 | else |
|
184 | 150 | handlerInfo.resultHandler = medium.Resolve; |
|
185 | 151 | |
|
186 | 152 | if (error != null) |
|
187 | 153 | handlerInfo.errorHandler = x => { |
|
188 | 154 | try { |
|
189 | 155 | error(x); |
|
190 | 156 | } catch { } |
|
191 | 157 | medium.Reject(x); |
|
192 | 158 | }; |
|
193 | 159 | else |
|
194 | 160 | handlerInfo.errorHandler = medium.Reject; |
|
195 | 161 | |
|
196 | 162 | AddHandler(handlerInfo); |
|
197 | 163 | |
|
198 | 164 | return medium; |
|
199 | 165 | } |
|
200 | 166 | |
|
167 | /// <summary> | |
|
168 | /// Adds new handlers to this promise. | |
|
169 | /// </summary> | |
|
170 | /// <param name="success">The handler of the successfully completed operation. | |
|
171 | /// This handler will recieve an operation result as a parameter.</param> | |
|
172 | /// <param name="error">Handles an exception that may occur during the operation and returns the value which will be used as the result of the operation.</param> | |
|
173 | /// <returns>The new promise chained to this one.</returns> | |
|
174 | public Promise<T> Then(ResultHandler<T> success, ErrorHandler<T> error) { | |
|
175 | if (success == null && error == null) | |
|
176 | return this; | |
|
177 | ||
|
178 | var medium = new Promise<T>(this, true); | |
|
179 | ||
|
180 | var handlerInfo = new ResultHandlerInfo(); | |
|
181 | ||
|
182 | if (success != null) | |
|
183 | handlerInfo.resultHandler = x => { | |
|
184 | success(x); | |
|
185 | medium.Resolve(x); | |
|
186 | }; | |
|
187 | else | |
|
188 | handlerInfo.resultHandler = medium.Resolve; | |
|
189 | ||
|
190 | if (error != null) | |
|
191 | handlerInfo.errorHandler = x => { | |
|
192 | try { | |
|
193 | medium.Resolve(error(x)); | |
|
194 | } catch { } | |
|
195 | medium.Reject(x); | |
|
196 | }; | |
|
197 | else | |
|
198 | handlerInfo.errorHandler = medium.Reject; | |
|
199 | ||
|
200 | AddHandler(handlerInfo); | |
|
201 | ||
|
202 | return medium; | |
|
203 | } | |
|
204 | ||
|
205 | ||
|
201 | 206 | public Promise<T> Then(ResultHandler<T> success) { |
|
202 |
|
|
|
207 | if (success == null) | |
|
208 | return this; | |
|
209 | ||
|
210 | var medium = new Promise<T>(this, true); | |
|
211 | ||
|
212 | var handlerInfo = new ResultHandlerInfo(); | |
|
213 | ||
|
214 | if (success != null) | |
|
215 | handlerInfo.resultHandler = x => { | |
|
216 | success(x); | |
|
217 | medium.Resolve(x); | |
|
218 | }; | |
|
219 | else | |
|
220 | handlerInfo.resultHandler = medium.Resolve; | |
|
221 | ||
|
222 | handlerInfo.errorHandler = medium.Reject; | |
|
223 | ||
|
224 | AddHandler(handlerInfo); | |
|
225 | ||
|
226 | return medium; | |
|
203 | 227 | } |
|
204 | 228 | |
|
205 | 229 | public Promise<T> Error(ErrorHandler error) { |
|
206 | 230 | return Then(null, error); |
|
207 | 231 | } |
|
208 | 232 | |
|
233 | /// <summary> | |
|
234 | /// Handles error and allows to keep the promise. | |
|
235 | /// </summary> | |
|
236 | /// <remarks> | |
|
237 | /// If the specified handler throws an exception, this exception will be used to reject the promise. | |
|
238 | /// </remarks> | |
|
239 | /// <param name="handler">The error handler which returns the result of the promise.</param> | |
|
240 | /// <returns>New promise.</returns> | |
|
241 | public Promise<T> Error(ErrorHandler<T> handler) { | |
|
242 | if (handler == null) | |
|
243 | return this; | |
|
244 | ||
|
245 | var medium = new Promise<T>(this, true); | |
|
246 | ||
|
247 | AddHandler(new ResultHandlerInfo { | |
|
248 | errorHandler = e => { | |
|
249 | try { | |
|
250 | medium.Resolve(handler(e)); | |
|
251 | } catch (Exception e2) { | |
|
252 | medium.Reject(e2); | |
|
253 | } | |
|
254 | } | |
|
255 | }); | |
|
256 | ||
|
257 | return medium; | |
|
258 | } | |
|
259 | ||
|
209 | 260 | public Promise<T> Anyway(Action handler) { |
|
210 | 261 | if (handler == null) |
|
211 | 262 | return this; |
|
212 | 263 | |
|
213 | 264 | var medium = new Promise<T>(); |
|
214 | 265 | |
|
215 | 266 | AddHandler(new ResultHandlerInfo { |
|
216 | 267 | resultHandler = x => { |
|
217 | 268 | // to avoid handler being called multiple times we handle exception by ourselfs |
|
218 | 269 | try { |
|
219 | 270 | handler(); |
|
220 | 271 | medium.Resolve(x); |
|
221 | 272 | } catch (Exception e) { |
|
222 | 273 | medium.Reject(e); |
|
223 | 274 | } |
|
224 | 275 | }, |
|
225 | 276 | errorHandler = x => { |
|
226 | 277 | try { |
|
227 | 278 | handler(); |
|
228 | 279 | } catch { } |
|
229 | 280 | medium.Reject(x); |
|
230 | 281 | } |
|
231 | 282 | }); |
|
232 | 283 | |
|
233 | 284 | return medium; |
|
234 | 285 | } |
|
235 | 286 | |
|
236 | 287 | /// <summary> |
|
237 | 288 | /// Позволяет преобразовать результат выполения операции к новому типу. |
|
238 | 289 | /// </summary> |
|
239 | 290 | /// <typeparam name="TNew">Новый тип результата.</typeparam> |
|
240 | 291 | /// <param name="mapper">Преобразование результата к новому типу.</param> |
|
241 | 292 | /// <param name="error">Обработчик ошибки. Данный обработчик получит |
|
242 | 293 | /// исключение возникшее при выполнении операции.</param> |
|
243 | 294 | /// <returns>Новое обещание, которое будет выполнено при выполнении исходного обещания.</returns> |
|
244 | 295 | public Promise<TNew> Map<TNew>(ResultMapper<T, TNew> mapper, ErrorHandler error) { |
|
245 | 296 | if (mapper == null) |
|
246 | 297 | throw new ArgumentNullException("mapper"); |
|
247 | 298 | |
|
248 | 299 | // создаем прицепленное обещание |
|
249 | 300 | var chained = new Promise<TNew>(); |
|
250 | 301 | |
|
251 | 302 | AddHandler(new ResultHandlerInfo() { |
|
252 | 303 | resultHandler = result => chained.Resolve(mapper(result)), |
|
253 | 304 | errorHandler = delegate(Exception e) { |
|
254 | 305 | if (error != null) |
|
255 | 306 | try { |
|
256 | 307 | error(e); |
|
257 | 308 | } catch { } |
|
258 | 309 | // в случае ошибки нужно передать исключение дальше по цепочке |
|
259 | 310 | chained.Reject(e); |
|
260 | 311 | } |
|
261 | 312 | }); |
|
262 | 313 | |
|
263 | 314 | return chained; |
|
264 | 315 | } |
|
265 | 316 | |
|
266 | 317 | public Promise<TNew> Map<TNew>(ResultMapper<T, TNew> mapper) { |
|
267 | 318 | return Map(mapper, null); |
|
268 | 319 | } |
|
269 | 320 | |
|
270 | 321 | /// <summary> |
|
271 | 322 | /// Сцепляет несколько аснхронных операций. Указанная асинхронная операция будет вызвана после |
|
272 | 323 | /// выполнения текущей, а результат текущей операции может быть использован для инициализации |
|
273 | 324 | /// новой операции. |
|
274 | 325 | /// </summary> |
|
275 | 326 | /// <typeparam name="TNew">Тип результата указанной асинхронной операции.</typeparam> |
|
276 | 327 | /// <param name="chained">Асинхронная операция, которая должна будет начаться после выполнения текущей.</param> |
|
277 | 328 | /// <param name="error">Обработчик ошибки. Данный обработчик получит |
|
278 | 329 | /// исключение возникшее при выполнении текуещй операции.</param> |
|
279 | 330 | /// <returns>Новое обещание, которое будет выполнено по окончанию указанной аснхронной операции.</returns> |
|
280 | 331 | public Promise<TNew> Chain<TNew>(ChainedOperation<T, TNew> chained, ErrorHandler error) { |
|
281 | 332 | |
|
282 | 333 | // проблема в том, что на момент связывания еще не начата асинхронная операция, поэтому нужно |
|
283 | 334 | // создать посредника, к которому будут подвызяваться следующие обработчики. |
|
284 | 335 | // когда будет выполнена реальная асинхронная операция, она обратиться к посреднику, чтобы |
|
285 | 336 | // передать через него результаты работы. |
|
286 | 337 | var medium = new Promise<TNew>(this, true); |
|
287 | 338 | |
|
288 | 339 | AddHandler(new ResultHandlerInfo { |
|
289 | 340 | resultHandler = delegate(T result) { |
|
290 | 341 | if (medium.State == PromiseState.Cancelled) |
|
291 | 342 | return; |
|
292 | 343 | |
|
293 | 344 | var promise = chained(result); |
|
294 | 345 | |
|
295 | 346 | // notify chained operation that it's not needed |
|
296 | 347 | medium.Cancelled(() => promise.Cancel()); |
|
297 | 348 | promise.Then( |
|
298 | medium.Resolve, | |
|
299 | medium.Reject | |
|
300 |
|
|
|
349 | x => medium.Resolve(x), | |
|
350 | e => medium.Reject(e) | |
|
351 | ); | |
|
301 | 352 | }, |
|
302 | 353 | errorHandler = delegate(Exception e) { |
|
303 | 354 | if (error != null) |
|
304 | 355 | error(e); |
|
305 | 356 | // в случае ошибки нужно передать исключение дальше по цепочке |
|
306 | 357 | medium.Reject(e); |
|
307 | 358 | } |
|
308 | 359 | }); |
|
309 | 360 | |
|
310 | 361 | return medium; |
|
311 | 362 | } |
|
312 | 363 | |
|
313 | 364 | public Promise<TNew> Chain<TNew>(ChainedOperation<T, TNew> chained) { |
|
314 | 365 | return Chain(chained, null); |
|
315 | 366 | } |
|
316 | 367 | |
|
317 | 368 | public Promise<T> Cancelled(Action handler) { |
|
318 | 369 | if (handler == null) |
|
319 | 370 | return this; |
|
320 | 371 | lock (m_lock) { |
|
321 | 372 | if (m_state == PromiseState.Unresolved) |
|
322 | 373 | m_cancelHandlers.AddLast(handler); |
|
323 | 374 | else if (m_state == PromiseState.Cancelled) |
|
324 | 375 | handler(); |
|
325 | 376 | } |
|
326 | 377 | return this; |
|
327 | 378 | } |
|
328 | 379 | |
|
329 | 380 | public void HandleCancelled(Action handler) { |
|
330 | 381 | Cancelled(handler); |
|
331 | 382 | } |
|
332 | 383 | |
|
333 | 384 | /// <summary> |
|
334 | 385 | /// Дожидается отложенного обещания и в случае успеха, возвращает |
|
335 | 386 | /// его, результат, в противном случае бросает исключение. |
|
336 | 387 | /// </summary> |
|
337 | 388 | /// <remarks> |
|
338 | 389 | /// <para> |
|
339 | 390 | /// Если ожидание обещания было прервано по таймауту, это не значит, |
|
340 | 391 | /// что обещание было отменено или что-то в этом роде, это только |
|
341 | 392 | /// означает, что мы его не дождались, однако все зарегистрированные |
|
342 | 393 | /// обработчики, как были так остались и они будут вызваны, когда |
|
343 | 394 | /// обещание будет выполнено. |
|
344 | 395 | /// </para> |
|
345 | 396 | /// <para> |
|
346 | 397 | /// Такое поведение вполне оправдано поскольку таймаут может истечь |
|
347 | 398 | /// в тот момент, когда началась обработка цепочки обработчиков, и |
|
348 | 399 | /// к тому же текущее обещание может стоять в цепочке обещаний и его |
|
349 | 400 | /// отклонение может привести к непрогнозируемому результату. |
|
350 | 401 | /// </para> |
|
351 | 402 | /// </remarks> |
|
352 | 403 | /// <param name="timeout">Время ожидания</param> |
|
353 | 404 | /// <returns>Результат выполнения обещания</returns> |
|
354 | 405 | public T Join(int timeout) { |
|
355 | 406 | var evt = new ManualResetEvent(false); |
|
356 | 407 | Anyway(() => evt.Set()); |
|
357 | 408 | Cancelled(() => evt.Set()); |
|
358 | 409 | |
|
359 | 410 | if (!evt.WaitOne(timeout, true)) |
|
360 | 411 | throw new TimeoutException(); |
|
361 | 412 | |
|
362 | 413 | switch (State) { |
|
363 | 414 | case PromiseState.Resolved: |
|
364 | 415 | return m_result; |
|
365 | 416 | case PromiseState.Cancelled: |
|
366 | 417 | throw new OperationCanceledException(); |
|
367 | 418 | case PromiseState.Rejected: |
|
368 | 419 | throw new TargetInvocationException(m_error); |
|
369 | 420 | default: |
|
370 | 421 | throw new ApplicationException(String.Format("Invalid promise state {0}", State)); |
|
371 | 422 | } |
|
372 | 423 | } |
|
373 | 424 | |
|
374 | 425 | public T Join() { |
|
375 | 426 | return Join(Timeout.Infinite); |
|
376 | 427 | } |
|
377 | 428 | |
|
378 | 429 | void AddHandler(ResultHandlerInfo handler) { |
|
379 | 430 | bool invokeRequired = false; |
|
380 | 431 | |
|
381 | 432 | lock (m_lock) { |
|
382 | 433 | m_childrenCount++; |
|
383 | 434 | if (m_state == PromiseState.Unresolved) { |
|
384 | 435 | m_resultHandlers.AddLast(handler); |
|
385 | 436 | } else |
|
386 | 437 | invokeRequired = true; |
|
387 | 438 | } |
|
388 | 439 | |
|
389 | 440 | // обработчики не должны блокировать сам объект |
|
390 | 441 | if (invokeRequired) |
|
391 | 442 | InvokeHandler(handler); |
|
392 | 443 | } |
|
393 | 444 | |
|
394 | 445 | void InvokeHandler(ResultHandlerInfo handler) { |
|
395 | 446 | switch (m_state) { |
|
396 | 447 | case PromiseState.Resolved: |
|
397 | 448 | try { |
|
398 | 449 | if (handler.resultHandler != null) |
|
399 | 450 | handler.resultHandler(m_result); |
|
400 | 451 | } catch (Exception e) { |
|
401 | 452 | try { |
|
402 | 453 | if (handler.errorHandler != null) |
|
403 | 454 | handler.errorHandler(e); |
|
404 | 455 | } catch { } |
|
405 | 456 | } |
|
406 | 457 | break; |
|
407 | 458 | case PromiseState.Rejected: |
|
408 | 459 | try { |
|
409 | 460 | if (handler.errorHandler != null) |
|
410 | 461 | handler.errorHandler(m_error); |
|
411 | 462 | } catch { } |
|
412 | 463 | break; |
|
413 | 464 | default: |
|
414 | 465 | // do nothing |
|
415 | 466 | return; |
|
416 | 467 | } |
|
417 | 468 | } |
|
418 | 469 | |
|
470 | protected virtual void OnStateChanged() { | |
|
471 | switch (m_state) { | |
|
472 | case PromiseState.Resolved: | |
|
473 | foreach (var resultHandlerInfo in m_resultHandlers) | |
|
474 | try { | |
|
475 | if (resultHandlerInfo.resultHandler != null) | |
|
476 | resultHandlerInfo.resultHandler(m_result); | |
|
477 | } catch (Exception e) { | |
|
478 | try { | |
|
479 | if (resultHandlerInfo.errorHandler != null) | |
|
480 | resultHandlerInfo.errorHandler(e); | |
|
481 | } catch { } | |
|
482 | } | |
|
483 | break; | |
|
484 | case PromiseState.Cancelled: | |
|
485 | foreach (var cancelHandler in m_cancelHandlers) | |
|
486 | cancelHandler(); | |
|
487 | break; | |
|
488 | case PromiseState.Rejected: | |
|
489 | foreach (var resultHandlerInfo in m_resultHandlers) | |
|
490 | try { | |
|
491 | if (resultHandlerInfo.errorHandler != null) | |
|
492 | resultHandlerInfo.errorHandler(m_error); | |
|
493 | } catch { } | |
|
494 | break; | |
|
495 | default: | |
|
496 | throw new InvalidOperationException(String.Format("Promise entered an invalid state {0}", m_state)); | |
|
497 | } | |
|
498 | ||
|
499 | m_resultHandlers = null; | |
|
500 | m_cancelHandlers = null; | |
|
501 | } | |
|
502 | ||
|
419 | 503 | |
|
420 | 504 | |
|
421 | 505 | public bool IsExclusive { |
|
422 | 506 | get { |
|
423 | 507 | lock (m_lock) { |
|
424 | 508 | return m_childrenCount <= 1; |
|
425 | 509 | } |
|
426 | 510 | } |
|
427 | 511 | } |
|
428 | 512 | |
|
429 | 513 | public PromiseState State { |
|
430 | 514 | get { |
|
431 | 515 | lock (m_lock) { |
|
432 | 516 | return m_state; |
|
433 | 517 | } |
|
434 | 518 | } |
|
435 | 519 | } |
|
436 | 520 | |
|
437 |
p |
|
|
521 | protected bool Cancel(bool dependencies) { | |
|
438 | 522 | bool result; |
|
439 | 523 | |
|
440 | 524 | lock (m_lock) { |
|
441 | 525 | if (m_state == PromiseState.Unresolved) { |
|
442 | 526 | m_state = PromiseState.Cancelled; |
|
443 | 527 | result = true; |
|
444 | 528 | } else { |
|
445 | 529 | result = false; |
|
446 | 530 | } |
|
447 | 531 | } |
|
448 | 532 | |
|
449 | 533 | if (result) |
|
450 | 534 | OnStateChanged(); |
|
451 | 535 | |
|
452 | 536 | if (dependencies && m_parent != null && m_parent.IsExclusive) { |
|
453 |
m_parent.Cancel( |
|
|
537 | m_parent.Cancel(); | |
|
454 | 538 | } |
|
455 | 539 | |
|
456 | 540 | return result; |
|
457 | 541 | } |
|
458 | 542 | } |
|
459 | 543 | } |
|
1 | NO CONTENT: file was removed |
General Comments 0
You need to be logged in to leave comments.
Login now