implab/ImplabNet Files · Implab/ChainTask.cs

DRAFT: refactoring

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             ChainTask.cs
        
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      using System;

      using System.Threading;

      namespace Implab {

          public class ChainTask : AbstractPromise, IDeferred {

              readonly Func<IPromise> m_task;

              readonly Action<Exception> m_error;

              readonly Action<Exception> m_cancel;

              int m_cancelationLock;

              public ChainTask(Func<IPromise> task, Func<Exception> error, Func<Exception> cancel) {

                  m_task = task;

              }

              public void Resolve() {

                  if (m_task != null && LockCancelation()) {

                      try {

                          var operation = m_task();

                          if (operation == null)

                              throw new NullReferenceException("The task returned null promise");

                          operation.On(SetResult, SetError, SetCancelled);

                          CancelationRequested(operation.Cancel);

                      } catch(Exception err) {

                          HandleErrorInternal(err);

                      }

                  }

              }

              public void Reject(Exception error) {

                  throw new NotImplementedException();

              }

              protected void HandleErrorInternal(Exception error) {

                  if (m_error != null) {

                      try {

                          m_error(error);

                          SetResult();

                      } catch(Exception err) {

                          SetError(err);

                      }

                  } else {

                      SetError(error);

                  }

              }

              protected bool LockCancelation() {

                  return 0 == Interlocked.CompareExchange(ref m_cancelationLock, 1, 0);

              }

          }

      }

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				using System;
				using System.Threading;

				namespace Implab {
				public class ChainTask : AbstractPromise, IDeferred {
				readonly Func<IPromise> m_task;
				readonly Action<Exception> m_error;
				readonly Action<Exception> m_cancel;

				int m_cancelationLock;

				public ChainTask(Func<IPromise> task, Func<Exception> error, Func<Exception> cancel) {
				m_task = task;
				}

				public void Resolve() {
				if (m_task != null && LockCancelation()) {
				try {
				var operation = m_task();
				if (operation == null)
				throw new NullReferenceException("The task returned null promise");

				operation.On(SetResult, SetError, SetCancelled);

				CancelationRequested(operation.Cancel);
				} catch(Exception err) {
				HandleErrorInternal(err);
				}
				}
				}

				public void Reject(Exception error) {
				throw new NotImplementedException();
				}

				protected void HandleErrorInternal(Exception error) {
				if (m_error != null) {
				try {
				m_error(error);
				SetResult();
				} catch(Exception err) {
				SetError(err);
				}
				} else {
				SetError(error);
				}
				}

				protected bool LockCancelation() {
				return 0 == Interlocked.CompareExchange(ref m_cancelationLock, 1, 0);
				}
				}
				}