cqrs-eda/dist/observers/decorators.js

Lightweight CQRS and Event-Driven Architecture library using TypeScript decorators, handlers and typings. Perfect for scalable event-driven apps.

// Registry mapping event names to arrays of observer class constructors
const observerRegistry = new Map();
/**
 * Decorator to register a class as an Observer for a specific event.
 * Multiple observers can listen to the same event.
 *
 * @param eventName - The name of the event to observe.
 * @returns Class decorator function.
 */
export function Observer(eventName) {
    return function (target) {
        if (!observerRegistry.has(eventName)) {
            observerRegistry.set(eventName, []);
        }
        observerRegistry.get(eventName).push(target);
    };
}
/**
 * Retrieves the entire observer registry.
 *
 * @returns Map where keys are event names and values are arrays of observer constructors.
 */
export function getObserverRegistry() {
    return observerRegistry;
}