@mbc-cqrs-serverless/core/dist/decorators/event-handler.decorator.js

CQRS and event base core

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.EventHandler = void 0;
require("reflect-metadata");
const ulid_1 = require("ulid");
const constants_1 = require("./constants");
/**
 * Decorator that marks a class as an event handler.
 * The handler will be invoked when the specified event is published.
 *
 * @param event - The event class or instance to handle
 * @example
 * ```typescript
 * @EventHandler(OrderCreatedEvent)
 * export class OrderCreatedHandler implements IEventHandler<OrderCreatedEvent> {
 *   async handle(event: OrderCreatedEvent) {
 *     // Handle the event
 *   }
 * }
 * ```
 */
const EventHandler = (event) => {
    return (target) => {
        if (!Reflect.hasOwnMetadata(constants_1.EVENT_METADATA, event)) {
            Reflect.defineMetadata(constants_1.EVENT_METADATA, { id: (0, ulid_1.ulid)() }, event);
        }
        Reflect.defineMetadata(constants_1.EVENT_HANDLER_METADATA, event, target);
    };
};
exports.EventHandler = EventHandler;
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