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PromiseAwaiter`1.cs
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/ Implab / PromiseAwaiter`1.cs
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using System;
using System.Runtime.CompilerServices;
using System.Threading;
using Implab.Parallels;
namespace Implab {
public struct PromiseAwaiter<T> : INotifyCompletion {
class PromiseEvent : IResolvable<T> {
IDispatcher m_dispatcher;
Action m_handler;
public PromiseEvent(Action handler, IDispatcher dispatcher) {
m_handler = handler;
m_dispatcher = dispatcher;
}
public void Resolve(T result) {
m_dispatcher.Enqueue(m_handler);
}
public void Reject(Exception error) {
m_dispatcher.Enqueue(m_handler);
}
}
readonly IPromise<T> m_promise;
readonly IDispatcher m_dispatcher;
public PromiseAwaiter(IPromise<T> promise) {
m_promise = promise;
m_dispatcher = GetDispatcher();
}
public PromiseAwaiter(IPromise<T> promise, IDispatcher dispatcher) {
m_promise = promise;
m_dispatcher = dispatcher;
}
public void OnCompleted(Action continuation) {
if (m_promise != null)
m_promise.Then(new PromiseEvent(continuation, GetDispatcher()));
}
public T GetResult() {
return m_promise.Join();
}
static IDispatcher GetDispatcher() {
if (SynchronizationContext.Current == null)
return ThreadPoolDispatcher.Instance;
return new SyncContextDispatcher(SynchronizationContext.Current);
}
public bool IsCompleted {
get {
return m_promise.IsResolved;
}
}
}
}