implab/ImplabNet Files · Implab/Deferred.cs

working on promises

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             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 AbstractPromise m_promise;

              readonly IDispatcher m_dispatcher;

              internal Deferred(AbstractPromise 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) {

                  m_promise.Reject(error);

              }

              public void Resolve() {

                  m_promise.Resolve();

              }

              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);

                  }

              }

          }

      }

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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 AbstractPromise m_promise;
				readonly IDispatcher m_dispatcher;

				internal Deferred(AbstractPromise 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) {
				m_promise.Reject(error);
				}

				public void Resolve() {
				m_promise.Resolve();
				}

				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);
				}
				}
				}
				}