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    use futures::{Async, Future, Poll};

    use super::message::Request;
    use super::Writer;
    use error::Error;

    /// Low level http request handler
    #[allow(unused_variables)]
    pub trait HttpHandler: 'static {
        /// Request handling task
        type Task: HttpHandlerTask;

        /// Handle request
        fn handle(&self, req: Request) -> Result<Self::Task, Request>;
    }

    impl HttpHandler for Box<HttpHandler<Task = Box<HttpHandlerTask>>> {
        type Task = Box<HttpHandlerTask>;

        fn handle(&self, req: Request) -> Result<Box<HttpHandlerTask>, Request> {
            self.as_ref().handle(req)
        }
    }

    /// Low level http request handler
    pub trait HttpHandlerTask {
        /// Poll task, this method is used before or after *io* object is available
        fn poll_completed(&mut self) -> Poll<(), Error> {
            Ok(Async::Ready(()))
        }

        /// Poll task when *io* object is available
        fn poll_io(&mut self, io: &mut Writer) -> Poll<bool, Error>;

        /// Connection is disconnected
        fn disconnected(&mut self) {}
    }

    impl HttpHandlerTask for Box<HttpHandlerTask> {
        fn poll_io(&mut self, io: &mut Writer) -> Poll<bool, Error> {
            self.as_mut().poll_io(io)
        }
    }

    pub(super) struct HttpHandlerTaskFut<T: HttpHandlerTask> {
        task: T,
    }

    impl<T: HttpHandlerTask> HttpHandlerTaskFut<T> {
        pub(crate) fn new(task: T) -> Self {
            Self { task }
        }
    }

    impl<T: HttpHandlerTask> Future for HttpHandlerTaskFut<T> {
        type Item = ();
        type Error = ();

        fn poll(&mut self) -> Poll<(), ()> {
            self.task.poll_completed().map_err(|_| ())
        }
    }

    /// Conversion helper trait
    pub trait IntoHttpHandler {
        /// The associated type which is result of conversion.
        type Handler: HttpHandler;

        /// Convert into `HttpHandler` object.
        fn into_handler(self) -> Self::Handler;
    }

    impl<T: HttpHandler> IntoHttpHandler for T {
        type Handler = T;

        fn into_handler(self) -> Self::Handler {
            self
        }
    }

    impl<T: IntoHttpHandler> IntoHttpHandler for Vec<T> {
        type Handler = VecHttpHandler<T::Handler>;

        fn into_handler(self) -> Self::Handler {
            VecHttpHandler(self.into_iter().map(|item| item.into_handler()).collect())
        }
    }

    #[doc(hidden)]
    pub struct VecHttpHandler<H: HttpHandler>(Vec<H>);

    impl<H: HttpHandler> HttpHandler for VecHttpHandler<H> {
        type Task = H::Task;

        fn handle(&self, mut req: Request) -> Result<Self::Task, Request> {
            for h in &self.0 {
                req = match h.handle(req) {
                    Ok(task) => return Ok(task),
                    Err(e) => e,
                };
            }
            Err(req)
        }
    }

    macro_rules! http_handler ({$EN:ident, $(($n:tt, $T:ident)),+} => {
        impl<$($T: HttpHandler,)+> HttpHandler for ($($T,)+) {
            type Task = $EN<$($T,)+>;

            fn handle(&self, mut req: Request) -> Result<Self::Task, Request> {
                $(
                    req = match self.$n.handle(req) {
                        Ok(task) => return Ok($EN::$T(task)),
                        Err(e) => e,
                    };
                )+
                    Err(req)
            }
        }

        #[doc(hidden)]
        pub enum $EN<$($T: HttpHandler,)+> {
            $($T ($T::Task),)+
        }

        impl<$($T: HttpHandler,)+> HttpHandlerTask for $EN<$($T,)+>
        {
            fn poll_completed(&mut self) -> Poll<(), Error> {
                match self {
                    $($EN :: $T(ref mut task) => task.poll_completed(),)+
                }
            }

            fn poll_io(&mut self, io: &mut Writer) -> Poll<bool, Error> {
                match self {
                    $($EN::$T(ref mut task) => task.poll_io(io),)+
                }
            }

            /// Connection is disconnected
            fn disconnected(&mut self) {
                match self {
                    $($EN::$T(ref mut task) => task.disconnected(),)+
                }
            }
        }
    });

    http_handler!(HttpHandlerTask1, (0, A));
    http_handler!(HttpHandlerTask2, (0, A), (1, B));
    http_handler!(HttpHandlerTask3, (0, A), (1, B), (2, C));
    http_handler!(HttpHandlerTask4, (0, A), (1, B), (2, C), (3, D));
    http_handler!(HttpHandlerTask5, (0, A), (1, B), (2, C), (3, D), (4, E));
    http_handler!(
        HttpHandlerTask6,
        (0, A),
        (1, B),
        (2, C),
        (3, D),
        (4, E),
        (5, F)
    );
    http_handler!(
        HttpHandlerTask7,
        (0, A),
        (1, B),
        (2, C),
        (3, D),
        (4, E),
        (5, F),
        (6, G)
    );
    http_handler!(
        HttpHandlerTask8,
        (0, A),
        (1, B),
        (2, C),
        (3, D),
        (4, E),
        (5, F),
        (6, G),
        (7, H)
    );
    http_handler!(
        HttpHandlerTask9,
        (0, A),
        (1, B),
        (2, C),
        (3, D),
        (4, E),
        (5, F),
        (6, G),
        (7, H),
        (8, I)
    );
    http_handler!(
        HttpHandlerTask10,
        (0, A),
        (1, B),
        (2, C),
        (3, D),
        (4, E),
        (5, F),
        (6, G),
        (7, H),
        (8, I),
        (9, J)
    );

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