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import { findMapKeyOfValue } from '../utils'; const _systems = new Map(); const _events = new Events(); /** * System base class. * Every Oxygen Core system extends this class. */ export default class System { /** @type {*} */ static get systems() { const result = {}; for (const [name, system] of _systems) { result[name] = system; } return result; } /** @type {Events} */ static get events() { return _events; } /** * Register new system instance under given name. * * @param {string} typename - System type name. * @param {System} system - System instance. * * @return {System} Registered system instance. * * @example * class MySystem extends System {} * System.register('MySystem', new MySystem()); * const { MySystem } = System.systems; */ static register(typename, system) { if (typeof typename !== 'string') { throw new Error('`typename` is not type of String!'); } if (!(system instanceof System)) { throw new Error('`system` is not type of System!'); } if (_systems.has(typename)) { throw new Error(`Given system type is already registered: ${typename}`); } _systems.set(typename, system); system.onRegister(); return system; } /** * Unregister given system. * * @param {string} typename - System type name * * @return {System} Unregistered system instance. * @example * System.unregister('MySystem'); */ static unregister(typename) { let system = typename; if (typeof typename === 'string') { system = _systems.get(typename); } else if (system instanceof System) { typename = findMapKeyOfValue(_systems, system); } else { throw new Error('`typename` is not type of either System or String!'); } if (_systems.delete(typename)) { system.onUnregister(); return system; } else { throw new Error(`Trying to remove non-registered system type: ${typename}`); } } /** * Returns system instance of given type name. * * @param {string} typename - System type name. * * @return {System|null} System instance if registered or null if not. * * @example * const system = System.get('MySystem'); */ static get(typename) { if (typeof typename !== 'string') { throw new Error('`typename` is not type of String!'); } return _systems.get(typename) || null; } /** * Dispose and remove all registered systems. * * @example * System.dispose(); */ static dispose() { for (const system of _systems.values()) { system.dispose(); } _systems.clear(); _events.dispose(); } /** * Destructor (disposes all internal resources). */ dispose() {} /** * Event called after system gets registered. */ onRegister() {} /** * Event called before system gets unregistered. */ onUnregister() {} } </code></pre> </div> <footer class="footer"> Generated by <a href="https://esdoc.org">ESDoc(1.1.0)<img src="./image/esdoc-logo-mini-black.png"></a> </footer> <script src="script/search_index.js"></script> <script src="script/search.js"></script> <script src="script/pretty-print.js"></script> <script src="script/inherited-summary.js"></script> <script src="script/test-summary.js"></script> <script 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