acelga-bus/dist/src/corebus/receiver.js

An extensible typescript message bus with support for middlewares

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
const executor_1 = require("./executor");
const middlewareChain_1 = require("./middlewareChain");
class Receiver {
    constructor() {
        this.middlewareChain = new middlewareChain_1.MiddlewareChain();
        this.subscriptions = new Map();
        this.globalSubscriptions = new Set();
    }
    on(eventType, callback) {
        let callbacksSet = this.subscriptions.get(eventType);
        if (!callbacksSet)
            callbacksSet = new Set();
        callbacksSet.add(callback);
        this.subscriptions.set(eventType, callbacksSet);
    }
    onAny(callback) {
        this.globalSubscriptions.add(callback);
    }
    trigger(event) {
        return __awaiter(this, void 0, void 0, function* () {
            const result = yield this.middlewareChain.execute(event);
            const callbacks = this.subscriptions.get(event.constructor);
            if (!result)
                return;
            const future = [];
            if (callbacks) {
                future.push(new executor_1.Executor(result, ...callbacks));
            }
            if (this.globalSubscriptions.size) {
                future.push(new executor_1.Executor(result, ...this.globalSubscriptions));
            }
            return Promise.all(future.map(executor => executor.execStopOnFail()))
                .then(() => { });
        });
    }
    off(eventType, callback) {
        if (!callback) {
            this.subscriptions.delete(eventType);
            return;
        }
        const callbacks = this.subscriptions.get(eventType);
        if (!callbacks)
            return;
        callbacks.delete(callback);
    }
    pushMiddleware(middleware) {
        this.middlewareChain.push(middleware);
    }
    unshiftMiddleware(middleware) {
        this.middlewareChain.unshift(middleware);
    }
}
exports.Receiver = Receiver;
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