buflux/dist/core/event-emitter.js

A high-performance, event-driven buffer library for Node.js and browsers, with configurable overflow strategies

/**
 * Event emitter class for handling buffer events
 * @template T The type of data passed to event handlers
 */
export class EventEmitter {
    constructor() {
        /** Map of event names to sets of handler functions */
        this.events = {
            enqueue: new Set(),
            dequeue: new Set(),
            overflow: new Set(),
            reject: new Set(),
        };
    }
    /**
     * Subscribe to a buffer event
     * @param {BufferEvent} event - The event to subscribe to
     * @param {EventHandler<T>} handler - Function to handle the event
     * @returns {Function} Unsubscribe function to remove the handler
     */
    on(event, handler) {
        this.events?.[event]?.add(handler);
        return () => {
            this.events?.[event]?.delete(handler);
        };
    }
    /**
     * Emit an event to all subscribed handlers
     * @param {BufferEvent} event - The event to emit
     * @param {T} data - Data to pass to handlers
     */
    emit(event, data) {
        for (const handler of this.events?.[event] || []) {
            handler(data);
        }
    }
}