public Task MapAsync(Func<IContainer> container, Type type, MethodInfo method, Routing.Route route)
{
container.ThrowIfNull("container");
type.ThrowIfNull("type");
method.ThrowIfNull("method");
route.ThrowIfNull("route");
bool methodReturnTypeImplementsIResponse = method.ReturnType.ImplementsInterface<IResponse>();
bool methodReturnTypeIsTaskT = method.ReturnType.IsGenericType && method.ReturnType.GetGenericTypeDefinition() == typeof(Task<>);
bool methodReturnTypeIsVoid = method.ReturnType == typeof(void);
if (methodReturnTypeImplementsIResponse)
{
ParameterInfo[] parameterInfos = method.GetParameters();
ParameterExpression instanceParameterExpression = Expression.Parameter(typeof(object), "instance");
ParameterExpression parametersParameterExpression = Expression.Parameter(typeof(object[]), "parameters");
UnaryExpression unaryExpression =
Expression.Convert(
Expression.Call(
Expression.Convert(instanceParameterExpression, type),
method,
parameterInfos.Select((arg, index) => Expression.Convert(
Expression.ArrayIndex(parametersParameterExpression, Expression.Constant(index)),
arg.ParameterType))),
typeof(IResponse));
Func<object, object[], IResponse> @delegate = Expression.Lambda<Func<object, object[], IResponse>>(unaryExpression, instanceParameterExpression, parametersParameterExpression).Compile();
route.RespondWith(
async context =>
{
object instance;
try
{
instance = container().GetInstance(type);
}
catch (Exception exception)
{
throw new ApplicationException(String.Format("Unable to resolve instance of type {0}.", type.FullName), exception);
}
if (instance == null)
{
throw new ApplicationException(String.Format("Unable to resolve instance of type {0}.", type.FullName));
}
var parameterValueRetriever = new ParameterValueRetriever(_parameterMappers);
object[] parameterValues = (await parameterValueRetriever.GetParameterValuesAsync(context, type, method)).ToArray();
var mappedDelegateContexts = new List<IMappedDelegateContext>();
try
{
mappedDelegateContexts.AddRange(_contextFactories.Select(arg => arg.CreateContext(context, type, method)).Where(arg => arg != null));
IResponse response = @delegate(instance, parameterValues);
foreach (IMappedDelegateContext mappedDelegateContext in mappedDelegateContexts)
{
mappedDelegateContext.Complete();
}
return response;
}
finally
{
foreach (IMappedDelegateContext mappedDelegateContext in mappedDelegateContexts)
{
mappedDelegateContext.Dispose();
}
}
},
method.ReturnType);
}
else if (methodReturnTypeIsTaskT)
{
ParameterInfo[] parameterInfos = method.GetParameters();
ParameterExpression instanceParameterExpression = Expression.Parameter(typeof(object), "instance");
ParameterExpression parametersParameterExpression = Expression.Parameter(typeof(object[]), "parameters");
Type methodGenericArgumentType = method.ReturnType.GetGenericArguments()[0];
MethodInfo upcastMethodInfo = typeof(TaskExtensions)
.GetMethod("Upcast", BindingFlags.Static | BindingFlags.Public)
.MakeGenericMethod(methodGenericArgumentType, typeof(IResponse));
UnaryExpression unaryExpression =
Expression.Convert(
Expression.Call(
upcastMethodInfo,
Expression.Call(
Expression.Convert(instanceParameterExpression, type),
method,
parameterInfos.Select((arg, index) => Expression.Convert(
Expression.ArrayIndex(parametersParameterExpression, Expression.Constant(index)),
arg.ParameterType)))),
upcastMethodInfo.ReturnType);
Func<object, object[], Task<IResponse>> @delegate = Expression.Lambda<Func<object, object[], Task<IResponse>>>(unaryExpression, instanceParameterExpression, parametersParameterExpression).Compile();
route.RespondWith(
async context =>
{
object instance;
try
{
instance = container().GetInstance(type);
}
catch (Exception exception)
{
throw new ApplicationException(String.Format("Unable to resolve instance of type {0}.", type.FullName), exception);
}
if (instance == null)
{
throw new ApplicationException(String.Format("Unable to resolve instance of type {0}.", type.FullName));
}
var parameterValueRetriever = new ParameterValueRetriever(_parameterMappers);
object[] parameterValues = (await parameterValueRetriever.GetParameterValuesAsync(context, type, method)).ToArray();
var mappedDelegateContexts = new List<IMappedDelegateContext>();
try
{
mappedDelegateContexts.AddRange(_contextFactories.Select(arg => arg.CreateContext(context, type, method)).Where(arg => arg != null));
IResponse response = await @delegate(instance, parameterValues);
foreach (IMappedDelegateContext mappedDelegateContext in mappedDelegateContexts)
{
mappedDelegateContext.Complete();
}
return response;
}
finally
{
foreach (IMappedDelegateContext mappedDelegateContext in mappedDelegateContexts)
{
mappedDelegateContext.Dispose();
}
}
},
methodGenericArgumentType);
}
else if (methodReturnTypeIsVoid)
{
ParameterInfo[] parameterInfos = method.GetParameters();
ParameterExpression instanceParameterExpression = Expression.Parameter(typeof(object), "instance");
ParameterExpression parametersParameterExpression = Expression.Parameter(typeof(object[]), "parameters");
MethodCallExpression methodCallExpression =
Expression.Call(
Expression.Convert(instanceParameterExpression, type),
method,
parameterInfos.Select((arg, index) => Expression.Convert(
Expression.ArrayIndex(parametersParameterExpression, Expression.Constant(index)),
arg.ParameterType)));
Action<object, object[]> @delegate = Expression.Lambda<Action<object, object[]>>(methodCallExpression, instanceParameterExpression, parametersParameterExpression).Compile();
route.RespondWithNoContent(
async context =>
{
object instance;
try
{
instance = container().GetInstance(type);
}
catch (Exception exception)
{
throw new ApplicationException(String.Format("Unable to resolve instance of type {0}.", type.FullName), exception);
}
if (instance == null)
{
throw new ApplicationException(String.Format("Unable to resolve instance of type {0}.", type.FullName));
}
var parameterValueRetriever = new ParameterValueRetriever(_parameterMappers);
object[] parameterValues = (await parameterValueRetriever.GetParameterValuesAsync(context, type, method)).ToArray();
var mappedDelegateContexts = new List<IMappedDelegateContext>();
try
{
mappedDelegateContexts.AddRange(_contextFactories.Select(arg => arg.CreateContext(context, type, method)).Where(arg => arg != null));
@delegate(instance, parameterValues);
foreach (IMappedDelegateContext mappedDelegateContext in mappedDelegateContexts)
{
mappedDelegateContext.Complete();
}
}
finally
{
foreach (IMappedDelegateContext mappedDelegateContext in mappedDelegateContexts)
{
mappedDelegateContext.Dispose();
}
}
});
}
else
{
throw new ApplicationException(String.Format("The return type of {0}.{1} must implement {2} or be a {3} whose generic type argument implements {2}.", type.FullName, method.Name, typeof(IResponse).Name, typeof(Task<>)));
}
return Task.Factory.Empty();
}
public void Map(Func<IContainer> container, Type type, MethodInfo method, Routing.Route route)
{
container.ThrowIfNull("container");
type.ThrowIfNull("type");
method.ThrowIfNull("method");
route.ThrowIfNull("route");
if (method.ReturnType == typeof(void))
{
route.RespondWithNoContent();
return;
}
if (!method.ReturnType.ImplementsInterface<IResponse>())
{
throw new ApplicationException(String.Format("The return type of '{0}.{1}' does not implement '{2}'.", type.FullName, method.Name, typeof(IResponse).Name));
}
route.RespondWith(
request =>
{
object instance;
try
{
instance = container().GetInstance(type);
}
catch (Exception exception)
{
throw new ApplicationException(String.Format("Unable to resolve instance of type '{0}'.", type.FullName), exception);
}
if (instance == null)
{
throw new ApplicationException(String.Format("Unable to resolve instance of type '{0}'.", type.FullName));
}
var parameterValueRetriever = new ParameterValueRetriever(_parameterMappers);
IEnumerable<object> parameterValues = parameterValueRetriever.GetParameterValues(request, type, method);
return (IResponse)method.Invoke(instance, parameterValues.ToArray());
},
method.ReturnType);
}