Expand description
A local publish-subscribe pattern implementation.
Example
use lps::*;
use std::sync::Arc;
#[derive(Debug, Clone, Copy)]
struct Msg(i32);
impl Message for Msg {}
struct Pub {
msg_broker: Arc<dyn MessageBroker>,
}
impl Pub {
fn new(msg_broker: Arc<dyn MessageBroker>) -> Self {
Self { msg_broker }
}
}
impl Publisher for Pub {
fn message_broker(&self) -> Arc<dyn MessageBroker> {
Arc::clone(&self.msg_broker)
}
fn set_message_broker(&mut self, msg_broker: Arc<dyn MessageBroker>) {
self.msg_broker = msg_broker;
}
}
struct Sub {
sub: Subscription<Msg>,
}
impl Sub {
fn new() -> Self {
Self {
sub: Subscription::unregistered(),
}
}
}
impl Subscriber for Sub {
fn subscribe(&mut self, msg_broker: Arc<dyn MessageBroker>) {
let _ = self.sub.register(msg_broker);
}
fn unsubscribe(&mut self) {
let _ = self.sub.unregister();
}
fn activate(&self) {
let _ = self.sub.activate();
}
fn deactivate(&self) {
let _ = self.sub.deactivate();
}
fn process_messages(&mut self) {
self.sub
.message_iter()
.handle(|msg: Arc<Msg>| {
println!("The subscriber received a message: {:?}", msg);
})
.run();
}
}
let msg_broker: Arc<dyn MessageBroker> = Arc::new(DefaultMessageBroker::new());
let mut s = Sub::new();
s.subscribe(Arc::clone(&msg_broker));
let p = Pub::new(Arc::clone(&msg_broker));
p.publish(Arc::new(Msg(1)));
p.publish(Arc::new(Msg(2)));
p.publish(Arc::new(Msg(3)));
s.process_messages();
Macros
- Downcasts
Arc<dyn Message>
to the one of the given types and runs the code which corresponds to it.
Structs
- A message iterator which handles messages with
f
. - A function for handling messages of specific type.
- An iterator which yields messages from one
ErasedSubscription
. - The type id of the message.
- A type which is used for receiving messages of a specific type from the message broker.
Enums
Traits
- A function with erased type for handling messages.
- A
Subscription
with and erased message type. - A type which can be converted into a
ErasedMessageHandler
. - A type which is used for communicating between publishers and subscribers.
- A type which delivers messages from publishers to subscribers.
- An iterator which yields messages.
- A sender of messages.
- A receiver of messages.