actix 0.5.3

Actor framework for Rust
Documentation 
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use std::marker::PhantomData;
use futures::sync::oneshot::Sender as SyncSender;
use futures::unsync::oneshot::Sender as UnsyncSender;

use actor::{Actor, AsyncContext};
use context::Context;
use handler::{Handler, Message, MessageResponse};
use super::{Syn, Unsync,
            MessageDestination, MessageDestinationTransport};


/// Converter trait, packs message to suitable envelope
pub trait ToEnvelope<T: MessageDestination<A, M>, A, M: Message + 'static>
    where T::Transport: MessageDestinationTransport<T, A, M>,
          A: Actor + Handler<M>, A::Context: ToEnvelope<T, A, M>,
{
    /// Pack message into suitable envelope
    fn pack(msg: M, tx: Option<T::ResultSender>) -> T::Envelope;
}

pub trait EnvelopeProxy {

    type Actor: Actor;

    /// handle message within new actor and context
    fn handle(&mut self, act: &mut Self::Actor, ctx: &mut <Self::Actor as Actor>::Context);
}

pub struct MessageEnvelope<M: Message> {
    msg: M,
}

impl<M: Message> MessageEnvelope<M> {
    pub fn into_inner(self) -> M {
        self.msg
    }
}

impl<M: Message> From<M> for MessageEnvelope<M> {
    fn from(msg: M) -> MessageEnvelope<M> {
        MessageEnvelope{msg}
    }
}

pub struct SyncMessageEnvelope<M: Message + Send> where M::Result: Send {
    msg: M,
}

impl<M: Message + Send> SyncMessageEnvelope<M> where M::Result: Send {
    pub fn into_inner(self) -> M {
        self.msg
    }
}

impl<M: Message + Send> From<M> for SyncMessageEnvelope<M> where M::Result: Send {
    fn from(msg: M) -> SyncMessageEnvelope<M> {
        SyncMessageEnvelope{msg}
    }
}

impl<A, M> ToEnvelope<Syn, A, M> for Context<A>
    where A: Actor<Context=Context<A>> + Handler<M>,
          M: Message + Send + 'static, M::Result: Send,
{
    fn pack(msg: M, tx: Option<SyncSender<M::Result>>) -> SyncEnvelope<A> {
        SyncEnvelope::new(msg, tx)
    }
}

impl<T, A, M> ToEnvelope<Unsync, A, M> for T
    where A: Actor<Context=T> + Handler<M>, M: Message + 'static, T: AsyncContext<A>
{
    fn pack(msg: M, tx: Option<UnsyncSender<M::Result>>) -> UnsyncEnvelope<A> {
        UnsyncEnvelope::new(msg, tx)
    }
}

pub struct SyncEnvelope<A: Actor>(Box<EnvelopeProxy<Actor=A> + Send>);

unsafe impl<A: Actor> Send for SyncEnvelope<A> {}

impl<A: Actor> SyncEnvelope<A> {

    pub fn new<M>(msg: M, tx: Option<SyncSender<M::Result>>) -> SyncEnvelope<A>
        where A: Handler<M>, A::Context: AsyncContext<A>,
              M: Message + Send + 'static, M::Result: Send
    {
        SyncEnvelope(
            Box::new(SyncEnvelopeProxy{tx, msg: Some(msg), act: PhantomData}))
    }

    pub fn with_proxy(proxy: Box<EnvelopeProxy<Actor=A> + Send>) -> SyncEnvelope<A> {
        SyncEnvelope(proxy)
    }
}

impl<A: Actor> EnvelopeProxy for SyncEnvelope<A> {
    type Actor = A;

    fn handle(&mut self, act: &mut Self::Actor, ctx: &mut <Self::Actor as Actor>::Context) {
        self.0.handle(act, ctx)
    }
}

pub struct SyncEnvelopeProxy<A, M> where M: Message + Send {
    act: PhantomData<A>,
    msg: Option<M>,
    tx: Option<SyncSender<M::Result>>,
}

unsafe impl<A, M: Message + Send> Send for SyncEnvelopeProxy<A, M> {}

impl<A, M> EnvelopeProxy for SyncEnvelopeProxy<A, M>
    where M: Message + Send + 'static,
          A: Actor + Handler<M>, A::Context: AsyncContext<A>
{
    type Actor = A;

    fn handle(&mut self, act: &mut Self::Actor, ctx: &mut <Self::Actor as Actor>::Context) {
        let tx = self.tx.take();
        if tx.is_some() && tx.as_ref().unwrap().is_canceled() {
            return
        }

        if let Some(msg) = self.msg.take() {
            let fut = <Self::Actor as Handler<M>>::handle(act, msg, ctx);
            fut.handle(ctx, tx)
        }
    }
}

pub struct UnsyncEnvelope<A: Actor>(Box<EnvelopeProxy<Actor=A>>);

impl<A: Actor> UnsyncEnvelope<A> {

    pub fn new<M>(msg: M, tx: Option<UnsyncSender<M::Result>>) -> UnsyncEnvelope<A>
        where A: Handler<M>, A::Context: AsyncContext<A>,
              M: Message + 'static
    {
        UnsyncEnvelope(Box::new(UnsyncEnvelopeProxy{tx, msg: Some(msg),
                                                    act: PhantomData}))
    }
}

impl<A: Actor> EnvelopeProxy for UnsyncEnvelope<A> {
    type Actor = A;

    #[inline]
    fn handle(&mut self, act: &mut Self::Actor, ctx: &mut <Self::Actor as Actor>::Context) {
        self.0.handle(act, ctx)
    }
}

struct UnsyncEnvelopeProxy<A, M> where M: Message {
    msg: Option<M>,
    act: PhantomData<A>,
    tx: Option<UnsyncSender<M::Result>>,
}

impl<A, M> EnvelopeProxy for UnsyncEnvelopeProxy<A, M>
    where M: Message + 'static,
          A: Actor + Handler<M>, A::Context: AsyncContext<A>
{
    type Actor = A;

    fn handle(&mut self, act: &mut Self::Actor, ctx: &mut <Self::Actor as Actor>::Context)
    {
        let tx = self.tx.take();
        if tx.is_some() && tx.as_ref().unwrap().is_canceled() {
            return
        }
        if let Some(msg) = self.msg.take() {
            <Self::Actor as Handler<M>>::handle(act, msg, ctx).handle(ctx, tx)
        }
    }
}