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use std::rc::Rc;
use crate::{
shell::{BinaryMessengerReply, Context, EngineHandle, EngineManager},
Error, Result,
};
use super::MessageCodec;
pub struct MessageChannel<V>
where
V: 'static,
{
context: Rc<Context>,
sender: MessageSender<V>,
}
impl<V> MessageChannel<V> {
pub fn new<F>(
context: Rc<Context>,
engine_handle: EngineHandle,
channel_name: &str,
codec: &'static dyn MessageCodec<V>,
callback: F,
) -> Self
where
F: Fn(V, MessageReply<V>) + 'static,
{
Self::new_with_engine_manager(
context.clone(),
engine_handle,
channel_name,
codec,
callback,
&context.engine_manager.borrow(),
)
}
pub fn new_with_engine_manager<F>(
context: Rc<Context>,
engine_handle: EngineHandle,
channel_name: &str,
codec: &'static dyn MessageCodec<V>,
callback: F,
engine_manager: &EngineManager,
) -> Self
where
F: Fn(V, MessageReply<V>) + 'static,
{
let res = MessageChannel {
context: context.clone(),
sender: MessageSender {
context,
engine_handle,
channel_name: channel_name.into(),
codec,
},
};
let engine = engine_manager.get_engine(engine_handle);
if let Some(engine) = engine {
let codec = codec;
engine
.binary_messenger()
.register_channel_handler(channel_name, move |data, reply| {
let message = codec.decode_message(data).unwrap();
let reply = MessageReply { reply, codec };
callback(message, reply);
});
}
res
}
pub fn sender(&self) -> &MessageSender<V> {
&self.sender
}
}
#[derive(Clone)]
pub struct MessageSender<V>
where
V: 'static,
{
context: Rc<Context>,
engine_handle: EngineHandle,
channel_name: String,
codec: &'static dyn MessageCodec<V>,
}
impl<V> MessageSender<V> {
pub fn send_message<F>(&self, message: &V, reply: F) -> Result<()>
where
F: FnOnce(V) + 'static,
{
let encoded = self.codec.encode_message(message);
let engine_manager = self.context.engine_manager.borrow();
let engine = engine_manager.get_engine(self.engine_handle);
if let Some(engine) = engine {
let codec = self.codec;
engine
.binary_messenger()
.send_message(&self.channel_name, &encoded, move |message| {
let message = codec.decode_message(message).unwrap();
reply(message);
})
} else {
Err(Error::InvalidEngineHandle)
}
}
pub fn post_message(&self, message: &V) -> Result<()> {
let encoded = self.codec.encode_message(message);
let engine_manager = self.context.engine_manager.borrow();
let engine = engine_manager.get_engine(self.engine_handle);
if let Some(engine) = engine {
engine
.binary_messenger()
.post_message(&self.channel_name, &encoded)
} else {
Err(Error::InvalidEngineHandle)
}
}
}
pub struct MessageReply<V>
where
V: 'static,
{
reply: BinaryMessengerReply,
codec: &'static dyn MessageCodec<V>,
}
impl<V> MessageReply<V> {
pub fn send(self, value: V) {
let encoded = self.codec.encode_message(&value);
self.reply.send(&encoded);
}
}
impl<V> Drop for MessageChannel<V> {
fn drop(&mut self) {
let engine_manager = self.context.engine_manager.borrow();
let engine = engine_manager.get_engine(self.sender.engine_handle);
if let Some(engine) = engine {
engine
.binary_messenger()
.unregister_channel_handler(&self.sender.channel_name);
}
}
}