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/*
* This file is part of caronte (https://github.com/eciavatta/caronte).
* Copyright (c) 2020 Emiliano Ciavatta.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
const _ = require("lodash");
class Dispatcher {
constructor() {
this.listeners = [];
}
dispatch = (topic, payload) => {
this.listeners.filter(l => l.topic === topic).forEach(l => l.callback(payload));
};
register = (topic, callback) => {
if (typeof callback !== "function") {
throw new Error("dispatcher callback must be a function");
}
if (typeof topic === "string") {
this.listeners.push({topic, callback});
} else if (typeof topic === "object" && Array.isArray(topic)) {
topic.forEach(e => {
if (typeof e !== "string") {
throw new Error("all topics must be strings");
}
});
topic.forEach(e => this.listeners.push({e, callback}));
} else {
throw new Error("topic must be a string or an array of strings");
}
};
unregister = (callback) => {
_.remove(this.listeners, l => l.callback === callback);
};
}
const dispatcher = new Dispatcher();
export default dispatcher;
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