minions 0.2.6

Experimental actor library, under constant development.
Documentation 
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use lossyq::spsc::{Sender, channel};
use super::super::{Task, Message, Schedule, IdentifiedReceiver, new_id, ChannelId};
use super::connectable::{Connectable};
use super::identified_input::{IdentifiedInput};
use super::output_counter::{OutputCounter};

pub trait Scatter {
  type InputType   : Send;
  type OutputType  : Send;

  fn process(
    &mut self,
    input:   &mut Option<IdentifiedReceiver<Self::InputType>>,
    output:  &mut Vec<Sender<Message<Self::OutputType>>>) -> Schedule;
}

pub struct ScatterWrap<Input: Send, Output: Send> {
  name           : String,
  state          : Box<Scatter<InputType=Input,OutputType=Output>+Send>,
  input_rx       : Option<IdentifiedReceiver<Input>>,
  output_tx_vec  : Vec<Sender<Message<Output>>>,
}

impl<Input: Send, Output: Send> IdentifiedInput for ScatterWrap<Input,Output> {
  fn get_input_id(&self, ch_id: usize) -> Option<ChannelId> {
    if ch_id != 0 {
      None
    } else {
      match &self.input_rx {
        &Some(ref ch) => Some(ch.id.clone()),
        _             => None,
      }
    }
  }
}

impl<Input: Send, Output: Send> OutputCounter for ScatterWrap<Input,Output> {
  fn get_tx_count(&self, ch_id: usize) -> usize {
    if ch_id < self.output_tx_vec.len() {
      let otx_slice = self.output_tx_vec.as_slice();
      otx_slice[ch_id].seqno()
    } else {
      0
    }
  }
}

impl<Input: Send, Output: Send> Connectable for ScatterWrap<Input,Output> {
  type Input = Input;

  fn input(&mut self) -> &mut Option<IdentifiedReceiver<Input>> {
    &mut self.input_rx
  }
}

impl<Input: Send, Output: Send> Task for ScatterWrap<Input,Output> {
  fn execute(&mut self) -> Schedule {
    self.state.process(&mut self.input_rx,
                       &mut self.output_tx_vec)
  }
  fn name(&self) -> &String { &self.name }
  fn input_count(&self) -> usize { 1 }
  fn output_count(&self) -> usize { self.output_tx_vec.len() }

  fn input_id(&self, ch_id: usize) -> Option<ChannelId> {
    self.get_input_id(ch_id)
  }
  fn tx_count(&self, ch_id: usize) -> usize {
    self.get_tx_count(ch_id)
  }
}

pub fn new<Input: Send, Output: Send>(
    name            : &str,
    output_q_size   : usize,
    scatter         : Box<Scatter<InputType=Input,OutputType=Output>+Send>,
    n_channels      : usize)
      -> (Box<ScatterWrap<Input,Output>>, Vec<Box<Option<IdentifiedReceiver<Output>>>>)
{
  let mut tx_vec = Vec::with_capacity(n_channels);
  let mut rx_vec = Vec::with_capacity(n_channels);

  for i in 0..n_channels {
    let (output_tx, output_rx) = channel(output_q_size);
    tx_vec.push(output_tx);
    rx_vec.push(
      Box::new(
        Some(
          IdentifiedReceiver{
            id:     new_id(String::from(name), i),
            input:  output_rx,
          }
        )
      )
    );
  }

  (
    Box::new(
      ScatterWrap{
        name           : String::from(name),
        state          : scatter,
        input_rx       : None,
        output_tx_vec  : tx_vec,
      }
    ),
    rx_vec
  )
}