use std::collections::HashMap;
pub struct Message {
    pub kind: String,
    pub json: String,
}
pub trait MessageHandler {
    fn handle(&self, msg: &Message);
}
pub struct Mediator {
    storage: HashMap<String, Vec<&'static dyn MessageHandler>>,
}
impl Mediator {
    pub fn new() -> Self {
        Self {
            storage: HashMap::with_capacity(100),
        }
    }
    pub fn add(&mut self, kind: String, handler: &'static dyn MessageHandler) {
        let key = kind.clone();
        if self.storage.contains_key(&key) {
            let handlers = self.storage.get_mut(&key).unwrap();
            handlers.push(handler);
        } else {
            let mut handlers: Vec<&'static dyn MessageHandler> = Vec::new();
            handlers.push(handler);
            self.storage.insert(key, handlers);
        }
    }
    pub fn invoke(&self, msg: &Message) {
        let kind = msg.kind.clone();
        if self.storage.contains_key(&kind) {
            let handlers = self.storage.get(&kind).unwrap();
            for handler in handlers {
                handler.handle(msg);
            }
        }
    }
}

use std::collections::HashMap;
pub struct Message {
    pub kind: String,
    pub json: String,
}
pub trait MessageHandler {
    fn handle(&self, msg: &Message);
}
pub struct Mediator {
    storage: HashMap<String, Vec<&'static dyn MessageHandler>>,
}
impl Mediator {
    pub fn new() -> Self {
        Self {
            storage: HashMap::with_capacity(100),
        }
    }
    pub fn add(&mut self, kind: String, handler: &'static dyn MessageHandler) {
        let key = kind.clone();
        if self.storage.contains_key(&key) {
            let handlers = self.storage.get_mut(&key).unwrap();
            handlers.push(handler);
        } else {
            let mut handlers: Vec<&'static dyn MessageHandler> = Vec::new();
            handlers.push(handler);
            self.storage.insert(key, handlers);
        }
    }
    pub fn invoke(&self, msg: &Message) {
        let kind = msg.kind.clone();
        if self.storage.contains_key(&kind) {
            let handlers = self.storage.get(&kind).unwrap();
            for handler in handlers {
                handler.handle(msg);
            }
        }
    }
}