flo_scene 0.2.0

Entity-messaging system for composing large programs from small programs
Documentation 
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use crate::host::command_trait::*;
use crate::host::scene_context::*;
use crate::host::scene_message::*;

use futures::prelude::*;
use futures::future::{BoxFuture};
use futures::stream::{BoxStream};

use std::marker::{PhantomData};
use std::sync::*;

///
/// Basic type of a command that runs a function
///
pub struct FnCommand<TInput, TOutput>(PhantomData<Mutex<TOutput>>, Arc<dyn 'static + Send + Sync + Fn(BoxStream<'static, TInput>, SceneContext) -> BoxFuture<'static, ()>>);

impl<TInput, TOutput> FnCommand<TInput, TOutput>
where
    TInput:     'static + Send,
    TOutput:    'static + SceneMessage
{
    ///
    /// Creates a new FnCommand with an implementing function
    ///
    pub fn new<TFuture>(action: impl 'static + Send + Sync + Fn(BoxStream<'static, TInput>, SceneContext) -> TFuture) -> Self 
    where
        TFuture: 'static + Send + Future<Output=()>,
    {
        FnCommand(PhantomData, Arc::new(move |stream, context| action(stream, context).boxed()))
    }
}

impl<TInput, TOutput> Command for FnCommand<TInput, TOutput> 
where
    TInput:     'static + SceneMessage,
    TOutput:    'static + SceneMessage,
{
    type Input  = TInput;
    type Output = TOutput;

    #[inline]
    fn run<'a>(&'a self, input: impl 'static + Send + Stream<Item=Self::Input>, context: SceneContext) -> impl 'a + Send + Future<Output=()> {
        self.1(input.boxed(), context)
    }
}

impl<TInput, TOutput> Clone for FnCommand<TInput, TOutput> {
    #[inline]
    fn clone(&self) -> Self {
        FnCommand(PhantomData, Arc::clone(&self.1))
    }
}