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