66 lines
2.7 KiB
C#
66 lines
2.7 KiB
C#
namespace Caliburn.Micro.Core {
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using System;
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/// <summary>
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/// A result decorator which executes a coroutine when the wrapped result was cancelled.
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/// </summary>
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public class ContinueResultDecorator : ResultDecoratorBase {
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static readonly ILog Log = LogManager.GetLog(typeof(ContinueResultDecorator));
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readonly Func<IResult> coroutine;
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/// <summary>
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/// Initializes a new instance of the <see cref="ContinueResultDecorator"/> class.
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/// </summary>
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/// <param name="result">The result to decorate.</param>
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/// <param name="coroutine">The coroutine to execute when <paramref name="result"/> was canceled.</param>
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public ContinueResultDecorator(IResult result, Func<IResult> coroutine)
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: base(result) {
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if (coroutine == null)
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throw new ArgumentNullException("coroutine");
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this.coroutine = coroutine;
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}
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/// <summary>
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/// Called when the execution of the decorated result has completed.
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/// </summary>
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/// <param name="context">The context.</param>
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/// <param name="innerResult">The decorated result.</param>
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/// <param name="args">The <see cref="ResultCompletionEventArgs" /> instance containing the event data.</param>
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protected override void OnInnerResultCompleted(CoroutineExecutionContext context, IResult innerResult, ResultCompletionEventArgs args) {
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if (args.Error != null || !args.WasCancelled) {
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OnCompleted(new ResultCompletionEventArgs {Error = args.Error});
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}
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else {
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Log.Info(string.Format("Executing coroutine because {0} was cancelled.", innerResult.GetType().Name));
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Continue(context);
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}
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}
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void Continue(CoroutineExecutionContext context) {
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IResult continueResult;
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try {
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continueResult = coroutine();
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}
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catch (Exception ex) {
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OnCompleted(new ResultCompletionEventArgs {Error = ex});
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return;
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}
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try {
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continueResult.Completed += ContinueCompleted;
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IoC.BuildUp(continueResult);
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continueResult.Execute(context);
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}
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catch (Exception ex) {
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ContinueCompleted(continueResult, new ResultCompletionEventArgs {Error = ex});
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}
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}
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void ContinueCompleted(object sender, ResultCompletionEventArgs args) {
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((IResult)sender).Completed -= ContinueCompleted;
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OnCompleted(new ResultCompletionEventArgs {Error = args.Error, WasCancelled = (args.Error == null)});
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}
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}
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}
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