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#[cfg(test)]
mod test;
use std::sync::Arc;
use std::sync::mpsc;
use std::thread;
use std::any::{Any, TypeId};
use std::marker::PhantomData;
use std::ops::DerefMut;
use std::collections::BTreeMap as Map;
type MsgId = TypeId;
type ClientId = TypeId;
pub type AnyMsg = (MsgId, Arc<Any + Send + Sync>);
pub struct PumpThread {
thread: thread::JoinHandle<()>,
}
impl PumpThread {
pub fn join(self) {
self.thread.join().unwrap()
}
}
pub struct Pump {
incoming_txside: mpsc::Sender<AnyMsg>,
incoming: mpsc::Receiver<AnyMsg>,
outgoing: Map<MsgId, Vec<mpsc::Sender<AnyMsg>>>
}
impl Pump {
pub fn new() -> Self {
let (tx, rx) = mpsc::channel();
Self {
incoming_txside: tx,
incoming: rx,
outgoing: Map::new()
}
}
pub fn event_loop(&mut self, mapping: EventLoopMapping) -> EventLoop {
let (mpsc_tx, mpsc_rx) = mpsc::channel();
for msg_id in mapping.handler_map.keys() {
self.outgoing.entry(*msg_id).or_insert(Vec::new())
.push(mpsc_tx.clone());
}
EventLoop {
rx: mpsc_rx,
mappings: mapping
}
}
pub fn sender(&self) -> Sender {
Sender {
sender: self.incoming_txside.clone()
}
}
pub fn start(self) -> PumpThread {
PumpThread {
thread: thread::Builder::new().name("MessagePump".to_owned())
.stack_size(1<<16).spawn(move || {
drop(self.incoming_txside);
let incoming = self.incoming;
let mut outgoing = self.outgoing;
for msg in incoming.iter() {
outgoing.entry(msg.0).or_insert(Vec::new())
.retain(|client| client.send(msg.clone()).is_ok())
}
}).unwrap(),
}
}
}
pub struct Sender {
sender: mpsc::Sender<AnyMsg>
}
impl Sender {
pub fn send<Msg: 'static + Send + Sync>(&self, msg: Msg) -> Result<(), mpsc::SendError<AnyMsg>> {
let res = self.sender.send((TypeId::of::<Msg>(), Arc::new(msg)));
res
}
pub fn hang_up(self) { }
}
struct HandlerPair {
key: ClientId,
func: Box<Fn(&mut Any, &Any) + Send>
}
pub struct EventLoopMapping {
client_map: Map<ClientId, Box<Any + Send>>,
handler_map: Map<MsgId, Vec<HandlerPair>>
}
impl EventLoopMapping {
pub fn new() -> Self {
Self {
client_map: Map::new(),
handler_map: Map::new()
}
}
pub fn add_client<'a, C: Any + Send>(&'a mut self, client: C) -> ELHandlerAdder<'a, C> {
assert!(!self.client_map.contains_key(&TypeId::of::<C>()));
self.client_map.insert(TypeId::of::<C>(), Box::new(client));
ELHandlerAdder {
handler_map: &mut self.handler_map,
_spooky: PhantomData
}
}
pub fn handle(&mut self, msg: AnyMsg) {
let (ty, data) = msg;
if let Some(msg_clients) = self.handler_map.get(&ty) {
for &HandlerPair { key: client_ty, func: ref h } in msg_clients.iter() {
let client = self.client_map.get_mut(&client_ty).unwrap().deref_mut();
h(client, &*data);
}
}
}
}
pub struct EventLoop {
rx: mpsc::Receiver<AnyMsg>,
mappings: EventLoopMapping
}
impl EventLoop {
pub fn poll_once(&mut self) -> Result<(), ()> {
let msg = self.rx.recv();
if let Ok(msg) = msg {
self.mappings.handle(msg);
Ok(())
} else {
Err(())
}
}
}
pub struct ELHandlerAdder<'a, Client: Any> {
handler_map: &'a mut Map<MsgId, Vec<HandlerPair>>,
_spooky: PhantomData<Client>
}
impl<'a, Client: Any> ELHandlerAdder<'a, Client> {
pub fn add_handler<Msg: Any>(&mut self, func: fn(&mut Client, &Msg)) -> &mut Self {
let handler: Box<Fn(&mut Any, &Any) + Send> = Box::new(move |state, msg| {
func(state.downcast_mut::<Client>().unwrap(),
msg.downcast_ref::<Msg>().unwrap())
});
self.handler_map.entry(TypeId::of::<Msg>())
.or_insert(Vec::new())
.push(HandlerPair { key: TypeId::of::<Client>(), func: handler });
self
}
}