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using System;
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using Implab.Parallels;
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namespace Implab {
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public abstract class AbstractPromise : AbstractEvent<AbstractPromise.HandlerDescriptor>, IPromise {
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public struct HandlerDescriptor {
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readonly Action m_handler;
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readonly Action<Exception> m_error;
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readonly Action<Exception> m_cancel;
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readonly PromiseEventType m_mask;
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public HandlerDescriptor(Action success, Action<Exception> error, Action<Exception> cancel) {
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m_handler = success;
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m_error = error;
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m_cancel = cancel;
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m_mask = PromiseEventType.Success;
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}
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public HandlerDescriptor(Action handler, PromiseEventType mask) {
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m_handler = handler;
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m_error = null;
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m_cancel = null;
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m_mask = mask;
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}
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public void SignalSuccess() {
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if ((m_mask & PromiseEventType.Success) != 0 && m_handler != null) {
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try {
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m_handler();
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} catch (Exception err) {
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// avoid calling handler twice in case of error
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if (m_error != null)
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SignalError(err);
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}
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}
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}
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public void SignalError(Exception err) {
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if (m_error != null) {
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try {
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m_error(err);
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// Analysis disable once EmptyGeneralCatchClause
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} catch {
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}
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} else if ((m_mask & PromiseEventType.Error ) != 0 && m_handler != null) {
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try {
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m_handler();
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// Analysis disable once EmptyGeneralCatchClause
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} catch {
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}
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}
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}
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public void SignalCancel(Exception reason) {
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if (m_cancel != null) {
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try {
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m_cancel(reason);
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} catch (Exception err) {
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SignalError(err);
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}
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} else if ( (m_mask & PromiseEventType.Cancelled) != 0 && m_handler != null) {
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try {
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m_handler();
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// Analysis disable once EmptyGeneralCatchClause
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} catch {
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}
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}
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}
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}
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#region implemented abstract members of AbstractPromise
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protected override void SignalHandler(HandlerDescriptor handler, int signal) {
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switch (signal) {
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case SUCCEEDED_STATE:
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handler.SignalSuccess();
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break;
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case REJECTED_STATE:
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handler.SignalError(Error);
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break;
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case CANCELLED_STATE:
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handler.SignalCancel(CancellationReason);
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break;
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default:
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throw new InvalidOperationException(String.Format("Invalid promise signal: {0}", signal));
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}
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}
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protected override Signal GetResolveSignal() {
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var signal = new Signal();
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On(signal.Set, PromiseEventType.All);
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return signal;
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}
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#endregion
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public Type PromiseType {
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get {
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return typeof(void);
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}
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}
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public IPromise On(Action success, Action<Exception> error, Action<Exception> cancel) {
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AddHandler(new HandlerDescriptor(success, error, cancel));
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return this;
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}
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public IPromise On(Action success, Action<Exception> error) {
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AddHandler(new HandlerDescriptor(success, error, null));
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return this;
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}
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public IPromise On(Action success) {
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AddHandler(new HandlerDescriptor(success, null, null));
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return this;
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}
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public IPromise On(Action handler, PromiseEventType events) {
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AddHandler(new HandlerDescriptor(handler,events));
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return this;
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}
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public IPromise<T> Cast<T>() {
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throw new InvalidCastException();
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}
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public void Join() {
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WaitResult(-1);
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}
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public void Join(int timeout) {
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WaitResult(timeout);
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}
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protected void SetResult() {
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BeginSetResult();
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EndSetResult();
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}
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}
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}
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