@mbc-cqrs-serverless/core/dist/events/event-bus.js

CQRS and event base core

"use strict";
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
    return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
var EventBus_1;
Object.defineProperty(exports, "__esModule", { value: true });
exports.EventBus = void 0;
const common_1 = require("@nestjs/common");
const core_1 = require("@nestjs/core");
const decorators_1 = require("../decorators");
const exceptions_1 = require("../exceptions");
let EventBus = EventBus_1 = class EventBus {
    constructor(moduleRef) {
        this.moduleRef = moduleRef;
        this.logger = new common_1.Logger(EventBus_1.name);
        this.handlers = new Map();
    }
    execute(event) {
        const eventId = this.getEventId(event);
        const handlers = this.handlers.get(eventId);
        if (!handlers || !handlers.length) {
            throw new exceptions_1.EventHandlerNotFoundException(eventId);
        }
        return Promise.all(handlers.map((handler) => handler.execute(event)));
    }
    bind(handler, id) {
        const handlers = this.handlers.get(id) || [];
        handlers.push(handler);
        this.handlers.set(id, handlers);
        // this.logger.debug(
        //   'bound handler for ' +
        //     id +
        //     ' => handlers size: ' +
        //     handlers.length +
        //     ' => total event size: ' +
        //     this.handlers.size,
        // )
    }
    register(handlers = []) {
        handlers.forEach((handler) => this.registerHandler(handler));
    }
    registerHandler(handler) {
        const instance = this.moduleRef.get(handler, { strict: false });
        if (!instance) {
            return;
        }
        const target = this.reflectEventId(handler);
        if (!target) {
            throw new exceptions_1.InvalidEventHandlerException();
        }
        this.bind(instance, target);
    }
    getEventId(event) {
        const { constructor: eventType } = Object.getPrototypeOf(event);
        const eventMetadata = Reflect.getMetadata(decorators_1.EVENT_METADATA, eventType);
        if (!eventMetadata) {
            throw new exceptions_1.EventHandlerNotFoundException(eventType.name);
        }
        return eventMetadata.id;
    }
    reflectEventId(handler) {
        const event = Reflect.getMetadata(decorators_1.EVENT_HANDLER_METADATA, handler);
        const eventMetadata = Reflect.getMetadata(decorators_1.EVENT_METADATA, event);
        return eventMetadata.id;
    }
};
exports.EventBus = EventBus;
exports.EventBus = EventBus = EventBus_1 = __decorate([
    (0, common_1.Injectable)(),
    __metadata("design:paramtypes", [core_1.ModuleRef])
], EventBus);
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