alpha-command-bus/compiled/decorators.js

Very simple command bus implementation

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.getCommandHandlersFromObject = exports.CommandHandler = void 0;
require("reflect-metadata");
const CommandHandlerDescriptor_1 = require("./CommandHandlerDescriptor");
const is = require("predicates");
const COMMAND_METADATA = Symbol('alpha-command-bus');
// eslint-disable-next-line @typescript-eslint/naming-convention
function CommandHandler(filter) {
    return (target, methodName, descriptor) => {
        ensureMetadata(target).push({
            predicate: CommandHandlerDescriptor_1.CommandHandlerDescriptor.filterToPredicate(filter),
            methodName
        });
    };
}
exports.CommandHandler = CommandHandler;
function ensureMetadata(target) {
    if (Reflect.hasMetadata(COMMAND_METADATA, target)) {
        return Reflect.getMetadata(COMMAND_METADATA, target);
    }
    const metadata = [];
    Reflect.defineMetadata(COMMAND_METADATA, metadata, target);
    return metadata;
}
/**
 * Returns command handlers registered with decorator in given object
 */
function getCommandHandlersFromObject(object) {
    const references = Reflect.getMetadata(COMMAND_METADATA, object);
    if (!references || references.length === 0) {
        return [];
    }
    return references.map(entry => {
        const method = object[entry.methodName];
        is.assert(Function, `Property "${entry.methodName}" has to be a method`)(method);
        return new CommandHandlerDescriptor_1.CommandHandlerDescriptor(entry.predicate, method.bind(object));
    });
}
exports.getCommandHandlersFromObject = getCommandHandlersFromObject;