Deferred`1.cs
60 lines
| 1.7 KiB
| text/x-csharp
|
CSharpLexer
cin
|
r289 | using System; | |
| using System.Diagnostics; | |||
| using System.Threading.Tasks; | |||
| namespace Implab { | |||
| public class Deferred<T> : IResolvable<T> { | |||
| readonly Promise<T> m_promise; | |||
| internal Deferred() { | |||
| m_promise = new Promise<T>(); | |||
| } | |||
| protected Deferred(Promise<T> promise) { | |||
| Debug.Assert(promise != null); | |||
| m_promise = promise; | |||
| } | |||
| public IPromise<T> Promise { | |||
| get { return m_promise; } | |||
| } | |||
| public void Cancel() { | |||
| Reject(new OperationCanceledException()); | |||
| } | |||
| public virtual void Reject(Exception error) { | |||
| if (error is PromiseTransientException) | |||
| error = ((PromiseTransientException)error).InnerException; | |||
| m_promise.RejectPromise(error); | |||
| } | |||
| public virtual void Resolve(T value) { | |||
| m_promise.ResolvePromise(value); | |||
| } | |||
| public virtual void Resolve(IPromise<T> thenable) { | |||
| if (thenable == null) | |||
| Reject(new Exception("The promise or task are expected")); | |||
| if (thenable == m_promise) | |||
| Reject(new Exception("The promise cannot be resolved with oneself")); | |||
| try { | |||
| thenable.Then(this); | |||
| } catch (Exception err) { | |||
| Reject(err); | |||
| } | |||
| } | |||
| public virtual void Resolve(Task<T> thenable) { | |||
| if (thenable == null) | |||
| Reject(new Exception("The promise or task are expected")); | |||
| try { | |||
| thenable.Then(this); | |||
| } catch (Exception err) { | |||
| Reject(err); | |||
| } | |||
| } | |||
| } | |||
| } |