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Added awaiters to promises...
Added awaiters to promises Added static methods to Promise Resolve, Reject, All. Updated promise helpers
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r248:5cb4826c2c2a v3
r248:5cb4826c2c2a v3
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Deferred.cs
57 lines | 1.7 KiB | text/x-csharp | CSharpLexer
/ Implab / Deferred.cs
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using System;
using System.Diagnostics;
namespace Implab {
/// <summary>
/// This class is responsible for the promise resolution, dispatching and chaining
/// </summary>
public class Deferred : IResolvable {
readonly Promise m_promise;
readonly IDispatcher m_dispatcher;
internal Deferred(IDispatcher dispatcher) : this(new Promise(), dispatcher) {
}
internal Deferred(Promise promise, IDispatcher dispatcher) {
Debug.Assert(promise != null);
m_promise = promise;
m_dispatcher = dispatcher;
}
public IPromise Promise {
get { return m_promise; }
}
public void Reject(Exception error) {
if (error is PromiseTransientException)
error = ((PromiseTransientException)error).InnerException;
m_promise.RejectPromise(error);
}
public void Resolve() {
m_promise.ResolvePromise();
}
public void Resolve(IPromise 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"));
else if (m_dispatcher != null)
// dispatch (see ecma-262/6.0: 25.4.1.3.2 Promise Resolve Functions)
m_dispatcher.Enqueue(Chain, thenable);
else
Chain(thenable);
}
void Chain(IPromise thenable) {
try {
thenable.Then(this);
} catch (Exception err) {
Reject(err);
}
}
}
}