node-jet/lib/3_jet/daemon/subscription.js

Jet Realtime Message Bus for the Web. Daemon and Peer implementation.

'use strict';
import { createPathMatcher } from './path_matcher.js';
import { create as createValueMatcher } from './value_matcher.js';
/** A subscription corresponds to a fetch request.
 * Each subscription contains all the routes that match the subscription  */
export class Subscription {
    owner;
    id;
    messages = [];
    routes = [];
    pathMatcher;
    valueMatcher;
    constructor(msg, peer = undefined) {
        this.pathMatcher = createPathMatcher(msg);
        this.valueMatcher = createValueMatcher(msg);
        this.owner = peer;
        this.id = msg.id;
    }
    close = () => {
        this.routes.forEach((route) => {
            route.removeListener('Change', this.handleChange);
            route.removeListener('Remove', this.handleRemove);
        });
    };
    handleChange = (path, value) => {
        this.enqueue({ path, event: 'Change', value });
    };
    handleRemove = (path) => {
        this.enqueue({ path, event: 'Remove' });
    };
    addRoute = (route) => {
        this.routes.push(route);
        if (this.valueMatcher(route.value)) {
            this.enqueue({
                path: route.path,
                event: 'Add',
                value: route.value
            });
        }
        route.addListener('Change', this.handleChange);
        route.addListener('Remove', this.handleRemove);
    };
    setRoutes = (routes) => {
        routes.forEach((route) => {
            this.addRoute(route);
        });
    };
    matchesPath = (path) => this.pathMatcher(path);
    matchesValue = (value) => this.valueMatcher(value);
    enqueue = (msg) => {
        this.messages.push(msg);
    };
    send = () => {
        this.messages.forEach(async (msg) => {
            await this.owner?.queue(msg, this.id);
        });
        this.owner?.send();
        this.messages = [];
    };
}