|
|
using System;
|
|
|
using System.Diagnostics;
|
|
|
using System.Threading.Tasks;
|
|
|
|
|
|
namespace Implab {
|
|
|
/// <summary>
|
|
|
/// This class is responsible for the promise resolution, dispatching and chaining
|
|
|
/// </summary>
|
|
|
public class Deferred : IResolvable {
|
|
|
|
|
|
readonly Promise m_promise;
|
|
|
internal Deferred() {
|
|
|
m_promise = new Promise();
|
|
|
}
|
|
|
|
|
|
internal Deferred(Promise promise, IDispatcher dispatcher) {
|
|
|
Debug.Assert(promise != null);
|
|
|
m_promise = promise;
|
|
|
}
|
|
|
|
|
|
public IPromise 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() {
|
|
|
m_promise.ResolvePromise();
|
|
|
}
|
|
|
|
|
|
public virtual 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"));
|
|
|
|
|
|
try {
|
|
|
thenable.Then(this);
|
|
|
} catch (Exception err) {
|
|
|
Reject(err);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
public virtual void Resolve(Task thenable) {
|
|
|
if (thenable == null)
|
|
|
Reject(new Exception("The promise or task are expected"));
|
|
|
try {
|
|
|
thenable.Then(this);
|
|
|
} catch(Exception err) {
|
|
|
Reject(err);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
}
|
|
|
}
|
