theatre-events/dist/next/src/event-dispatcher/asynchronous-event-dispatcher.js

A full implementation of a standard event dispatcher for javascript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const event_listener_1 = require("./../event-listener");
/**
 * An asynchronous implementation of an event dispatcher.
 */
class AsynchronousEventDispatcher {
    constructor() {
        this.eventListeners = new Map();
    }
    /**
     * {@inheritdoc}
     */
    dispatch(name, payload) {
        let promises = [];
        if (!this.eventListeners.has(name)) {
            return Promise.all(promises).then(() => payload);
        }
        let priorities = [];
        this.eventListeners.get(name).forEach((v, k) => { priorities.push(k); });
        priorities.sort().map(priority => this.eventListeners.get(name).get(priority).map(l => {
            promises.push(l(payload));
        }));
        return Promise.all(promises).then(() => payload);
    }
    /**
     * {@inheritdoc}
     */
    addEventListener(name, listener) {
        listener.priority = listener.priority || event_listener_1.NORMAL_PRIORITY;
        if (!this.eventListeners.has(name)) {
            this.eventListeners.set(name, new Map());
        }
        if (!this.eventListeners.get(name).has(listener.priority)) {
            this.eventListeners.get(name).set(listener.priority, []);
        }
        this.eventListeners.get(name).get(listener.priority).push(listener);
    }
    /**
     * {@inheritdoc}
     */
    removeEventListener(name, listener) {
        if (!this.eventListeners.get(name)) {
            return;
        }
        this.eventListeners.get(name).forEach((stack, priority) => {
            stack.map((callback, index) => {
                if (callback !== listener) {
                    return;
                }
                stack.splice(index, 1);
            });
            if (!stack.length) {
                this.eventListeners.get(name).delete(priority);
            }
        });
        if (!this.eventListeners.get(name).size) {
            this.eventListeners.delete(name);
        }
    }
    /**
     * {inheritdoc}
     */
    clearEventListeners(name) {
        if (!name) {
            this.eventListeners.clear();
        }
        this.eventListeners.has(name) && this.eventListeners.delete(name);
    }
}
exports.default = AsynchronousEventDispatcher;
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