nestjs-event-sourcing-lib/dist/decorators/command.decorator.js

A comprehensive Event Sourcing and CQRS library for NestJS applications

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.COMMAND_METADATA = exports.COMMAND_HANDLER_METADATA = void 0;
exports.CommandHandler = CommandHandler;
exports.Command = Command;
exports.getCommandHandlerMetadata = getCommandHandlerMetadata;
exports.getCommandMetadata = getCommandMetadata;
exports.getCommandHandlers = getCommandHandlers;
const common_1 = require("@nestjs/common");
/**
 * Key for command handler metadata
 */
exports.COMMAND_HANDLER_METADATA = Symbol('COMMAND_HANDLER_METADATA');
/**
 * Key for command metadata
 */
exports.COMMAND_METADATA = Symbol('COMMAND_METADATA');
/**
 * Decorator to mark method as command handler
 *
 * @param commandType - command type (command class)
 * @param metadata - additional metadata
 * @returns method decorator
 */
function CommandHandler(commandType, metadata) {
    return function (target, propertyKey, descriptor) {
        const handlerMetadata = {
            commandType: commandType.name,
            aggregateType: metadata === null || metadata === void 0 ? void 0 : metadata.aggregateType,
            async: (metadata === null || metadata === void 0 ? void 0 : metadata.async) !== false,
            timeout: (metadata === null || metadata === void 0 ? void 0 : metadata.timeout) || 30000,
        };
        (0, common_1.SetMetadata)(exports.COMMAND_HANDLER_METADATA, handlerMetadata)(target, propertyKey, descriptor);
    };
}
/**
 * Decorator to mark class as command
 *
 * @param metadata - command metadata
 * @returns class decorator
 */
function Command(metadata) {
    return function (constructor) {
        (0, common_1.SetMetadata)(exports.COMMAND_METADATA, metadata || {})(constructor);
        return constructor;
    };
}
/**
 * Function to get command handler metadata
 */
function getCommandHandlerMetadata(target, propertyKey) {
    return Reflect.getMetadata(exports.COMMAND_HANDLER_METADATA, target, propertyKey);
}
/**
 * Function to get command metadata
 */
function getCommandMetadata(target) {
    return Reflect.getMetadata(exports.COMMAND_METADATA, target);
}
/**
 * Function to get all command handlers in class
 */
function getCommandHandlers(target) {
    const prototype = target.prototype || target;
    const propertyNames = Object.getOwnPropertyNames(prototype);
    const handlers = [];
    for (const propertyName of propertyNames) {
        const metadata = getCommandHandlerMetadata(prototype, propertyName);
        if (metadata) {
            handlers.push({ propertyKey: propertyName, metadata });
        }
    }
    return handlers;
}
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