2021-11-14 22:16:07 +00:00
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/**
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* @author Martin Karkowski
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* @email m.karkowski@zema.de
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* @create date 2021-11-12 12:25:30
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2021-11-16 20:41:08 +00:00
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* @modify date 2021-11-16 20:55:27
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2021-11-14 22:16:07 +00:00
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* @desc [description]
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*/
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import { memoize } from "lodash";
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2021-11-16 20:41:08 +00:00
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import { NopeEventEmitter } from "../eventEmitter/index";
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2021-11-14 22:16:07 +00:00
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import { generateId } from "../helpers/idMethods";
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import { deepClone, flattenObject, rgetattr, rsetattr } from "../helpers/objectMethods";
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import { comparePatternAndPath as _comparePatternAndPath, containsWildcards, TcomparePatternAndPathFunc } from "../helpers/pathMatchingMethods";
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2021-11-16 09:35:06 +00:00
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import { IEventAdditionalData, IEventCallback, INopeEventEmitter, INopeObserver, INopeTopic, IPropertyOptions, IPubSubSystem, TPubSubOptions } from "../types/nope/index";
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2021-11-14 22:16:07 +00:00
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2021-11-16 20:41:08 +00:00
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2021-11-14 22:16:07 +00:00
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type TMatchting<O extends INopeTopic = INopeTopic> = {
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// Contains subscriptions, that can get there data
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// by pulling.
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dataPull: Map<string, O[]>;
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// Contains subscriptions, which must be pulled
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dataQuery: Map<string, O[]>;
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}
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export class PubSubSystemBase<I extends INopeEventEmitter = INopeEventEmitter, O extends INopeTopic = INopeTopic> implements IPubSubSystem<I, O> {
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2021-11-16 09:35:06 +00:00
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public _options: TPubSubOptions = {
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mqttBasedPatternSubscriptions: true,
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forwardChildData: true,
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forwardParentData: true
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}
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public get options(): TPubSubOptions {
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return deepClone(this._options);
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2021-11-14 22:16:07 +00:00
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}
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2021-11-16 20:41:08 +00:00
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readonly incrementalDataChange: INopeEventEmitter<{
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path: string,
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data: unknown
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}> = new NopeEventEmitter();
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2021-11-14 22:16:07 +00:00
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protected _comparePatternAndPath: TcomparePatternAndPathFunc;
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/**
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* The internal used object to store the data.
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*
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* @author M.Karkowski
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* @type {unknown}
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* @memberof PubSubSystemBase
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*/
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protected _data: unknown = {};
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protected _sendCurrentDataOnSubscription = false;
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protected _id = generateId()
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/**
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* List of all Properties. For every property, we store the
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* PropertyOptions. Then, we know, what elements should be
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* subscribed and which not.
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*
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* @author M.Karkowski
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* @protected
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* @memberof PubSubSystemBase
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*/
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protected _emitters = new Map<O, {
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options: IPropertyOptions,
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subTopic: string | false,
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pubTopic: string | false,
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callback?: IEventCallback
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}>();
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protected _matched = new Map<string, TMatchting>();
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public constructor(
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protected _generateEmitterType: <T>() => I,
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options: Partial<TPubSubOptions> = {}
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) {
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this._options = Object.assign({
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mqttBasedPatternSubscriptions: true,
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forwardChildData: true,
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forwardParentData: true,
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matchTopicsWithoutWildcards: true
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}, options);
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2021-11-14 22:16:07 +00:00
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// Create a memoized function for the pattern matching (its way faster)
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this._comparePatternAndPath = memoize(
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(pattern: string, path: string) => {
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return _comparePatternAndPath(pattern, path, { matchTopicsWithoutWildcards: options.matchTopicsWithoutWildcards });
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2021-11-14 22:16:07 +00:00
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},
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(pattern: string, path: string) => {
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return `${pattern}-${path}`;
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}
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);
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}
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public register(emitter: I, options: IPropertyOptions): O {
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if (!this._emitters.has(emitter as unknown as O)) {
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let pubTopic: string | false =
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typeof options.topic === "string"
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? options.topic
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: options.topic.publish || null;
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let subTopic: string | false =
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typeof options.topic === "string"
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? options.topic
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: options.topic.subscribe || null;
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if (!(options.mode == "publish" || (Array.isArray(options.mode) && options.mode.includes("publish")))) {
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pubTopic = false;
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}
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if (!(options.mode == "subscribe" || (Array.isArray(options.mode) && options.mode.includes("subscribe")))) {
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subTopic = false;
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}
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// Define a callback, which will be used to forward
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// the data into the system:
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let callback: IEventCallback = undefined;
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if (pubTopic) {
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const _this = this;
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callback = (content, opts) => {
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// We use this callback to forward the data into the system:
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_this._pushData(pubTopic as string, content, opts);
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};
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}
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// Register the emitter. This will be used during topic matching.
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this._emitters.set(emitter as unknown as O, {
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options,
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pubTopic,
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subTopic,
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callback
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});
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// Update the Matching Rules.
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this.updateMatchting();
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if (callback) {
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// If necessary. Add the Callback.
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emitter.subscribe(callback, {
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skipCurrent: !this._sendCurrentDataOnSubscription
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});
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}
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// Now, if required, add the Data to the emitter.
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if (subTopic && this._sendCurrentDataOnSubscription) {
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if (containsWildcards(subTopic)) {
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// This is more Complex.
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this._patternbasedPullData(subTopic, null).map(item => {
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// We check if the content is null
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if (item.data !== null) {
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(emitter as unknown as O).emit(
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item.data,
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{
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sender: this._id,
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mode: "direct",
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topic: item.path
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}
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);
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}
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});
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} else {
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const currentContent = this._pullData(subTopic, null);
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if (currentContent !== null) {
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(emitter as unknown as O).emit(
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currentContent,
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{
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sender: this._id,
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mode: "direct",
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topic: subTopic
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}
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);
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}
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}
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}
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} else {
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throw Error("Already registered Emitter!");
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}
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return emitter as unknown as O;
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}
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public updateOptions(emitter: I, options: IPropertyOptions): void {
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if (this._emitters.has(emitter as unknown as O)) {
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const pubTopic =
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typeof options.topic === "string"
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? options.topic
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: options.topic.publish || null;
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const subTopic =
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typeof options.topic === "string"
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? options.topic
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: options.topic.subscribe || null;
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const data = this._emitters.get(emitter as unknown as O);
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data.options = options;
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data.subTopic = subTopic;
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data.pubTopic = pubTopic;
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this._emitters.set(emitter as unknown as O, data);
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// Update the Matching Rules.
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this.updateMatchting();
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} else {
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throw Error("Already registered Emitter!");
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}
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}
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public unregister(emitter: INopeEventEmitter): boolean {
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if (this._emitters.has(emitter as unknown as O)) {
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this._emitters.delete(emitter as unknown as O);
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// Update the Matching Rules.
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this.updateMatchting();
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return true;
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}
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return false;
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}
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public registerSubscription<T = unknown>(topic: string, subscription: IEventCallback<T>): INopeObserver {
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// Create the Emitter
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const emitter = this._generateEmitterType<T>();
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// Create the Observer
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const observer = emitter.subscribe(subscription);
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// Register the Emitter. Thereby the ELement
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// will be linked to the Pub-Sub-System.
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this.register(emitter, {
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mode: "subscribe",
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schema: {},
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topic: topic
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});
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// Return the Emitter
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return observer;
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}
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/**
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* Internal Match-Making Algorithm. This allowes to Create a predefined
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* List between Publishers and Subscribers. Thereby the Process is speed
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* up, by utilizing this Look-Up-Table
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*
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* @author M.Karkowski
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* @memberof PubSubSystemBase
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*/
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public updateMatchting(): void {
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// Clears all defined Matches
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this._matched.clear();
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// Iterate through all Publishers and
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for (const { pubTopic } of this._emitters.values()) {
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// Now, lets Update the Matching for the specific Topics.
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if (pubTopic) this._updateMatchingForTopic(pubTopic);
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}
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}
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protected __addToMatchingStructure(entry: keyof TMatchting, topicOfChange: string, pathOrPattern: string, emitter: O): void {
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if (!this._matched.has(topicOfChange)) {
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this._matched.set(topicOfChange, {
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dataPull: new Map(),
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dataQuery: new Map()
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});
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}
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const emitters = this._matched.get(topicOfChange)[entry].get(pathOrPattern) || [];
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emitters.push(emitter);
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this._matched.get(topicOfChange)[entry].set(pathOrPattern, emitters);
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}
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/** Function to Interanlly add a new Match
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*
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* @export
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* @param {string} topicOfChange
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*/
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protected _updateMatchingForTopic(topicOfChange: string): void {
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if (!this._matched.has(topicOfChange)) {
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this._matched.set(topicOfChange, {
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dataPull: new Map(),
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dataQuery: new Map()
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});
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}
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// Find all Matches
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for (const [emitter, { subTopic }] of this._emitters.entries()) {
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if (subTopic) {
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// Now lets determine the Path
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const result = this._comparePatternAndPath(subTopic, topicOfChange);
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if (result.affected) {
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2021-11-16 09:35:06 +00:00
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if (
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(result.affectedByChild && !this._options.forwardChildData) ||
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(result.affectedByParent && !this._options.forwardParentData)
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) {
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continue;
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}
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// We now have match the topic as following described:
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// 1) subscription contains a pattern
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// - dircet change (same-level) => content
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// - parent based change => content
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// - child based change => content
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// 2) subscription doesnt contains a pattern:
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// We more or less want the data on the path.
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// - direct change (topic = path) => content
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// - parent based change => a super change
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if (result.containsWildcards) {
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if (this._options.mqttBasedPatternSubscriptions) {
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if (result.patternToExtractData) {
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this.__addToMatchingStructure("dataQuery", topicOfChange, result.patternToExtractData, emitter);
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} else if (result.pathToExtractData) {
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this.__addToMatchingStructure("dataPull", topicOfChange, result.pathToExtractData, emitter);
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} else {
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throw Error("Implementation Error. Either the patternToExtractData or the pathToExtractData must be provided");
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}
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} else {
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this.__addToMatchingStructure("dataQuery", topicOfChange, topicOfChange, emitter);
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}
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} else {
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if (result.pathToExtractData) {
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this.__addToMatchingStructure("dataPull", topicOfChange, result.pathToExtractData, emitter);
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} else {
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throw Error("Implementation Error. The 'pathToExtractData' must be provided");
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}
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}
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}
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}
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}
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}
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/**
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*Internal Function to notify Asynchronous all Subscriptions
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*
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* @author M.Karkowski
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* @private
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* @param {string} topic
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* @param {*} content
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* @memberof PubSubSystemBase
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*/
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protected _notify(topic: string, options: IEventAdditionalData, _exclusiveEmitter: O = null): void {
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// Check whether a Matching exists for this
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// Topic, if not add it.
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if (!this._matched.has(topic)) {
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this._updateMatchingForTopic(topic);
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}
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const referenceToMatch = this._matched.get(topic);
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// Performe the direct Matches
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for (const [_pathToPull, _emitters] of referenceToMatch.dataPull.entries()) {
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for (const _emitter of _emitters) {
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// Get a new copy for every element.
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const data = this._pullData(_pathToPull, null);
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if (_exclusiveEmitter !== null && _emitter !== _exclusiveEmitter) {
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continue;
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}
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// Iterate through all Subscribers
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_emitter.emit(data, {
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...options,
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mode: "direct",
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topic: topic
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});
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}
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}
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|
|
|
|
// Performe the direct Matches
|
|
|
|
for (const [_pattern, _emitters] of referenceToMatch.dataQuery.entries()) {
|
|
|
|
|
|
|
|
for (const _emitter of _emitters) {
|
|
|
|
|
|
|
|
// Get a new copy for every element.
|
|
|
|
const data = this._pullData(_pattern, null);
|
|
|
|
|
|
|
|
if (_exclusiveEmitter !== null && _emitter !== _exclusiveEmitter) {
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
// Iterate through all Subscribers
|
|
|
|
_emitter.emit(data, {
|
|
|
|
...options,
|
|
|
|
mode: "direct",
|
|
|
|
topic: topic
|
|
|
|
});
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2021-11-16 20:41:08 +00:00
|
|
|
protected _pushData<T = unknown>(path: string, data: T, options: IEventAdditionalData = {}): void {
|
2021-11-14 22:16:07 +00:00
|
|
|
if (containsWildcards(path)) {
|
|
|
|
throw ("The Path contains wildcards. Please use the method \"patternbasedPullData\" instead");
|
2021-11-16 09:35:06 +00:00
|
|
|
} else if (path === "") {
|
2021-11-16 20:41:08 +00:00
|
|
|
this._data = deepClone(data);
|
2021-11-16 09:35:06 +00:00
|
|
|
this._notify(path, options);
|
2021-11-14 22:16:07 +00:00
|
|
|
} else {
|
2021-11-16 20:41:08 +00:00
|
|
|
rsetattr(this._data, path, deepClone(data));
|
2021-11-16 09:35:06 +00:00
|
|
|
this._notify(path, options);
|
2021-11-14 22:16:07 +00:00
|
|
|
}
|
2021-11-16 20:41:08 +00:00
|
|
|
|
|
|
|
// Emit the data change.
|
|
|
|
this.incrementalDataChange.emit({
|
|
|
|
path,
|
|
|
|
data
|
|
|
|
});
|
2021-11-14 22:16:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// Function to pull the Last Data of the Topic
|
|
|
|
protected _pullData<T = unknown, D = null>(topic: string, _default: D = null): T {
|
|
|
|
if (containsWildcards(topic)) {
|
|
|
|
throw ("The Path contains wildcards. Please use the method \"patternbasedPullData\" instead");
|
|
|
|
}
|
|
|
|
return deepClone(rgetattr<T>(this._data, topic, _default));
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
protected _patternbasedPullData<T = unknown, D = null>(pattern: string, _default: D = null): { path: string, data: T }[] {
|
|
|
|
// To extract the data based on a Pattern,
|
|
|
|
// we firstly, we check if the given pattern
|
|
|
|
// is a pattern.
|
|
|
|
if (!containsWildcards(pattern)) {
|
|
|
|
// Its not a pattern so we will speed up
|
|
|
|
// things.
|
|
|
|
return [{
|
|
|
|
path: pattern,
|
|
|
|
data: this._pullData(pattern, _default)
|
|
|
|
}];
|
|
|
|
}
|
|
|
|
|
|
|
|
// Now we know, we have to work with the query,
|
|
|
|
// for that purpose, we will adapt the data object
|
|
|
|
// to the following form:
|
|
|
|
// {path: value}
|
|
|
|
|
|
|
|
const flattenData = flattenObject(this._data);
|
|
|
|
const ret: { path: string, data: T }[] = [];
|
|
|
|
|
|
|
|
// We will use our alternative representation of the
|
|
|
|
// object to compare the pattern with the path item.
|
|
|
|
// only if there is a direct match => we will extract it.
|
|
|
|
// That corresponds to a direct level extraction and
|
|
|
|
// prevents to grap multiple items.
|
|
|
|
for (const [path, data] of flattenData.entries()) {
|
|
|
|
const result = this._comparePatternAndPath(pattern, path);
|
|
|
|
if (result.affectedOnSameLevel || result.affectedByChild) {
|
|
|
|
ret.push({
|
|
|
|
path,
|
|
|
|
data
|
|
|
|
});
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Now we just return our created element.
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
}
|