smart-saga-pattern/dist/adapters/redis/RedisAdapter.js

A library implementing the Saga pattern for microservice architecture

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.RedisAdapter = void 0;
/**
 * Adapter for Redis Pub/Sub
 * Note: This is a placeholder implementation. In a real implementation,
 * you would use a Redis client library like 'ioredis'.
 */
class RedisAdapter {
    /**
     * Creates a new RedisAdapter
     * @param options Redis adapter options
     */
    constructor(options) {
        this.handlers = new Map();
        this.connected = false;
        this.options = {
            prefix: "saga:",
            ...options,
        };
    }
    /**
     * Connects to Redis
     */
    async connect() {
        // In a real implementation, you would connect to Redis here
        console.log(`Connecting to Redis at ${this.options.url}`);
        this.connected = true;
    }
    /**
     * Disconnects from Redis
     */
    async disconnect() {
        // In a real implementation, you would disconnect from Redis here
        console.log("Disconnecting from Redis");
        this.connected = false;
    }
    /**
     * Publishes a message to a channel
     * @param topic Channel to publish to
     * @param message Message to publish
     */
    async publish(topic, message) {
        this.ensureConnected();
        const channel = this.getChannelName(topic);
        // In a real implementation, you would publish to Redis here
        console.log(`Publishing message to channel '${channel}':`, message);
        // Simulate message delivery to subscribers
        setTimeout(() => {
            const topicHandlers = this.handlers.get(topic);
            if (topicHandlers) {
                console.log(`Delivering message to ${topicHandlers.length} handlers for topic '${topic}'`);
                topicHandlers.forEach((handler) => {
                    handler(message).catch((error) => {
                        console.error(`Error handling message on channel '${channel}':`, error);
                    });
                });
            }
            else {
                console.log(`No handlers found for topic '${topic}'`);
            }
        }, 10);
    }
    /**
     * Subscribes to a channel
     * @param topic Channel to subscribe to
     * @param handler Handler function for messages
     */
    async subscribe(topic, handler) {
        this.ensureConnected();
        const channel = this.getChannelName(topic);
        // In a real implementation, you would subscribe to Redis here
        console.log(`Subscribing to channel '${channel}'`);
        const handlers = this.handlers.get(topic) || [];
        handlers.push(handler);
        this.handlers.set(topic, handlers);
    }
    /**
     * Unsubscribes from a channel
     * @param topic Channel to unsubscribe from
     */
    async unsubscribe(topic) {
        this.ensureConnected();
        const channel = this.getChannelName(topic);
        // In a real implementation, you would unsubscribe from Redis here
        console.log(`Unsubscribing from channel '${channel}'`);
        this.handlers.delete(topic);
    }
    /**
     * Gets the full channel name with prefix
     * @param topic Base topic name
     */
    getChannelName(topic) {
        return `${this.options.prefix}${topic}`;
    }
    /**
     * Ensures the adapter is connected
     */
    ensureConnected() {
        if (!this.connected) {
            throw new Error("RedisAdapter is not connected");
        }
    }
}
exports.RedisAdapter = RedisAdapter;