smart-saga-pattern/dist/adapters/kafka/KafkaAdapter.js

A library implementing the Saga pattern for microservice architecture

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.KafkaAdapter = void 0;
/**
 * Adapter for Kafka message broker
 * Note: This is a placeholder implementation. In a real implementation,
 * you would use a Kafka client library like 'kafkajs'.
 */
class KafkaAdapter {
    /**
     * Creates a new KafkaAdapter
     * @param options Kafka adapter options
     */
    constructor(options) {
        this.handlers = new Map();
        this.connected = false;
        this.options = options;
    }
    /**
     * Connects to Kafka
     */
    async connect() {
        // In a real implementation, you would connect to Kafka here
        console.log(`Connecting to Kafka brokers: ${this.options.brokers.join(', ')}`);
        this.connected = true;
    }
    /**
     * Disconnects from Kafka
     */
    async disconnect() {
        // In a real implementation, you would disconnect from Kafka here
        console.log('Disconnecting from Kafka');
        this.connected = false;
    }
    /**
     * Publishes a message to a topic
     * @param topic Topic to publish to
     * @param message Message to publish
     */
    async publish(topic, message) {
        this.ensureConnected();
        // In a real implementation, you would publish to Kafka here
        console.log(`Publishing message to topic '${topic}':`, message);
        // Simulate message delivery to subscribers
        setTimeout(() => {
            const topicHandlers = this.handlers.get(topic);
            if (topicHandlers) {
                topicHandlers.forEach(handler => {
                    handler(message).catch(error => {
                        console.error(`Error handling message on topic '${topic}':`, error);
                    });
                });
            }
        }, 10);
    }
    /**
     * Subscribes to a topic
     * @param topic Topic to subscribe to
     * @param handler Handler function for messages
     */
    async subscribe(topic, handler) {
        this.ensureConnected();
        // In a real implementation, you would subscribe to Kafka here
        console.log(`Subscribing to topic '${topic}'`);
        const handlers = this.handlers.get(topic) || [];
        handlers.push(handler);
        this.handlers.set(topic, handlers);
    }
    /**
     * Unsubscribes from a topic
     * @param topic Topic to unsubscribe from
     */
    async unsubscribe(topic) {
        this.ensureConnected();
        // In a real implementation, you would unsubscribe from Kafka here
        console.log(`Unsubscribing from topic '${topic}'`);
        this.handlers.delete(topic);
    }
    /**
     * Ensures the adapter is connected
     */
    ensureConnected() {
        if (!this.connected) {
            throw new Error('KafkaAdapter is not connected');
        }
    }
}
exports.KafkaAdapter = KafkaAdapter;