use-next-sse/dist/cjs/client/sse-manager.js

A lightweight Server-Sent Events (SSE) library for Next.js, enabling real-time, unidirectional data streaming from server to client

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.sseManager = void 0;
class SSEManager {
    constructor() {
        this.connections = new Map();
    }
    getConnection(url, init) {
        let connection = this.connections.get(url);
        if (!connection) {
            const source = new EventSource(url, init);
            connection = { source, refCount: 0, listeners: new Map() };
            this.connections.set(url, connection);
        }
        connection.refCount++;
        return connection.source;
    }
    releaseConnection(url) {
        const connection = this.connections.get(url);
        if (connection) {
            connection.refCount--;
            if (connection.refCount === 0) {
                connection.source.close();
                this.connections.delete(url);
            }
        }
    }
    addEventListener(url, eventName, listener) {
        const connection = this.connections.get(url);
        if (connection) {
            if (!connection.listeners.has(eventName)) {
                connection.listeners.set(eventName, new Set());
                connection.source.addEventListener(eventName, (event) => {
                    const listeners = connection.listeners.get(eventName);
                    listeners === null || listeners === void 0 ? void 0 : listeners.forEach((listener) => listener(event));
                });
            }
            connection.listeners.get(eventName).add(listener);
        }
    }
    removeEventListener(url, eventName, listener) {
        const connection = this.connections.get(url);
        if (connection) {
            const listeners = connection.listeners.get(eventName);
            if (listeners) {
                listeners.delete(listener);
                if (listeners.size === 0) {
                    connection.listeners.delete(eventName);
                }
            }
        }
    }
}
exports.sseManager = new SSEManager();