anypay 0.1.0

AnyPay is a payment processing platform that allows you to accept payments from multiple cryptocurrencies and fiat currencies.
Documentation 
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use std::collections::{HashMap, HashSet};
use tokio::sync::RwLock;
use uuid::Uuid;
use crate::types::Subscription;
use crate::session::Session;

pub struct EventDispatcher {
    subscriptions: RwLock<HashMap<Subscription, HashSet<Uuid>>>,
}

impl EventDispatcher {
    pub fn new() -> Self {
        EventDispatcher {
            subscriptions: RwLock::new(HashMap::new()),
        }
    }

    pub async fn subscribe(&self, session: Session, sub_type: &str, id: &str) {
        let subscription = Subscription {
            sub_type: sub_type.to_string(),
            id: id.to_string(),
        };
        
        let mut subs = self.subscriptions.write().await;
        subs.entry(subscription)
            .or_insert_with(HashSet::new)
            .insert(session.id);
    }

    pub async fn unsubscribe(&self, session: Session, sub_type: &str, id: &str) {
        let subscription = Subscription {
            sub_type: sub_type.to_string(),
            id: id.to_string(),
        };
        
        let mut subs = self.subscriptions.write().await;
        if let Some(sessions) = subs.get_mut(&subscription) {
            sessions.remove(&session.id);
            if sessions.is_empty() {
                subs.remove(&subscription);
            }
        }
    }

    pub async fn get_subscribers(&self, subscription: &Subscription) -> HashSet<Uuid> {
        self.subscriptions
            .read()
            .await
            .get(subscription)
            .cloned()
            .unwrap_or_default()
    }
}