/// <inheritdoc />
public void Handle(IControllerBindingContext context, Action next)
{
next();
foreach (var parameter in context.Parameters.Where(p => !p.HasBinding && p.Info.ParameterType.IsClass))
{
parameter.SetBinding(messageContext => messageContext.Config.DependencyResolver.Resolve(parameter.Info.ParameterType));
}
}
public void Handle(IControllerBindingContext context, Action next)
{
if (context.Method.GetCustomAttribute <StartAttribute>() != null)
{
return;
}
RegisterYieldPointResult(context);
RegisterContinuationFilter(context);
next();
ValidateRequestResponse(context);
}
private static void ValidateRequestResponse(IControllerBindingContext context)
{
var request = context.MessageClass?.GetCustomAttribute <RequestAttribute>();
if (request?.Response == null)
{
return;
}
if (!context.Result.Info.ParameterType.IsTypeOrTaskOf(t => t == request.Response || t == typeof(IYieldPoint), out _))
{
throw new ResponseExpectedException($"Response of class {request.Response.FullName} expected in controller {context.Method.DeclaringType?.FullName}, method {context.Method.Name}");
}
}
/// <inheritdoc />
public void Handle(IControllerBindingContext context, Action next)
{
next();
if (context.Result.HasHandler)
{
return;
}
var hasClassResult = context.Result.Info.ParameterType.IsTypeOrTaskOf(t => t.IsClass, out var isTaskOf, out var actualType);
var request = context.MessageClass?.GetCustomAttribute <RequestAttribute>();
var expectedClassResult = request?.Response;
// Verify the return type matches with the Request attribute of the message class. This is a backwards incompatible change in
// Tapeti 1.2: if you just want to publish another message as a result of the incoming message, explicitly call IPublisher.Publish.
// ReSharper disable once ConvertIfStatementToSwitchStatement
if (!hasClassResult && expectedClassResult != null || hasClassResult && expectedClassResult != actualType)
{
throw new ArgumentException($"Message handler must return type {expectedClassResult?.FullName ?? "void"} in controller {context.Method.DeclaringType?.FullName}, method {context.Method.Name}, found: {actualType?.FullName ?? "void"}");
}
if (!hasClassResult)
{
return;
}
if (isTaskOf)
{
var handler = GetType().GetMethod("PublishGenericTaskResult", BindingFlags.NonPublic | BindingFlags.Static)?.MakeGenericMethod(actualType);
Debug.Assert(handler != null, nameof(handler) + " != null");
context.Result.SetHandler(async(messageContext, value) => { await(Task) handler.Invoke(null, new[] { messageContext, value }); });
}
else
{
context.Result.SetHandler((messageContext, value) => Reply(value, messageContext));
}
}
/// <inheritdoc />
public void Handle(IControllerBindingContext context, Action next)
{
if (!context.HasMessageClass)
{
if (context.Parameters.Count == 0)
{
throw new TopologyConfigurationException($"First parameter of method {context.Method.Name} in controller {context.Method.DeclaringType?.Name} must be a message class");
}
var parameter = context.Parameters[0];
if (!parameter.Info.ParameterType.IsClass)
{
throw new TopologyConfigurationException($"First parameter {parameter.Info.Name} of method {context.Method.Name} in controller {context.Method.DeclaringType?.Name} must be a message class");
}
parameter.SetBinding(messageContext => messageContext.Message);
context.SetMessageClass(parameter.Info.ParameterType);
}
next();
}
private static void RegisterYieldPointResult(IControllerBindingContext context)
{
if (!context.Result.Info.ParameterType.IsTypeOrTaskOf(typeof(IYieldPoint), out var isTaskOf))
{
return;
}
if (isTaskOf)
{
context.Result.SetHandler(async(messageContext, value) =>
{
var yieldPoint = await(Task <IYieldPoint>) value;
if (yieldPoint != null)
{
await HandleYieldPoint(messageContext, yieldPoint);
}
});
}
else
{
context.Result.SetHandler((messageContext, value) => HandleYieldPoint(messageContext, (IYieldPoint)value));
}
}
private static void RegisterContinuationFilter(IControllerBindingContext context)
{
var continuationAttribute = context.Method.GetCustomAttribute <ContinuationAttribute>();
if (continuationAttribute == null)
{
return;
}
context.SetBindingTargetMode(BindingTargetMode.Direct);
context.Use(new FlowContinuationMiddleware());
if (context.Result.HasHandler)
{
return;
}
// Continuation without IYieldPoint indicates a ParallelRequestBuilder response handler,
// make sure to store it's state as well
if (context.Result.Info.ParameterType == typeof(Task))
{
context.Result.SetHandler(async(messageContext, value) =>
{
await(Task) value;
await HandleParallelResponse(messageContext);
});
}
else if (context.Result.Info.ParameterType == typeof(void))
{
context.Result.SetHandler((messageContext, value) => HandleParallelResponse(messageContext));
}
else
{
throw new ArgumentException($"Result type must be IYieldPoint, Task or void in controller {context. Method.DeclaringType?.FullName}, method {context.Method.Name}");
}
}
/// <inheritdoc />
public void ApplyBindingMiddleware(IControllerBindingContext context, Action lastHandler)
{
MiddlewareHelper.Go(bindingMiddleware,
(handler, next) => handler.Handle(context, next),
lastHandler);
}
