78 lines
2.9 KiB
C#
78 lines
2.9 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Reflection;
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using System.Threading.Tasks;
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using Tapeti.Config;
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using Tapeti.Flow.Annotations;
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using Tapeti.Flow.Default;
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namespace Tapeti.Flow
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{
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public class FlowMiddleware : IMiddlewareBundle
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{
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public IEnumerable<object> GetContents(IDependencyResolver dependencyResolver)
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{
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var container = dependencyResolver as IDependencyContainer;
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if (container != null)
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{
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container.RegisterDefault<IFlowProvider, FlowProvider>();
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container.RegisterDefault<IFlowHandler, FlowProvider>();
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// TODO singleton
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container.RegisterDefault<IFlowStore, FlowStore>();
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container.RegisterDefault<IFlowRepository, NonPersistentFlowRepository>();
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}
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return new[] { new FlowBindingMiddleware() };
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}
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internal class FlowBindingMiddleware : IBindingMiddleware
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{
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public void Handle(IBindingContext context, Action next)
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{
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HandleContinuationFilter(context);
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HandleYieldPointResult(context);
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next();
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}
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private static void HandleContinuationFilter(IBindingContext context)
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{
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var continuationAttribute = context.Method.GetCustomAttribute<ContinuationAttribute>();
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if (continuationAttribute != null)
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{
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context.Use(new FlowBindingFilter());
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context.Use(new FlowMessageMiddleware());
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}
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}
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private static void HandleYieldPointResult(IBindingContext context)
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{
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if (context.Result.Info.ParameterType == typeof(IYieldPoint))
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context.Result.SetHandler((messageContext, value) => HandleYieldPoint(messageContext, (IYieldPoint)value));
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else if (context.Result.Info.ParameterType == typeof(Task<>))
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{
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var genericArguments = context.Result.Info.ParameterType.GetGenericArguments();
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if (genericArguments.Length == 1 && genericArguments[0] == typeof(IYieldPoint))
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context.Result.SetHandler(async (messageContext, value) =>
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{
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var yieldPoint = await (Task<IYieldPoint>)value;
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if (yieldPoint != null)
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await HandleYieldPoint(messageContext, yieldPoint);
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});
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}
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}
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private static Task HandleYieldPoint(IMessageContext context, IYieldPoint yieldPoint)
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{
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var flowHandler = context.DependencyResolver.Resolve<IFlowHandler>();
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return flowHandler.Execute(context, yieldPoint);
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}
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}
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}
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}
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