@ua/react-native-airship/lib/module/UAEventEmitter.js

Airship plugin for React Native apps.

"use strict";

/* Copyright Airship and Contributors */

import { NativeEventEmitter, Platform, AppRegistry } from 'react-native';

/**
 * SDK event emitter.
 *
 * @hidden
 */
export class UAEventEmitter {
  listeners = new Map();
  constructor(nativeModule) {
    this.nativeModule = nativeModule;
    this.eventEmitter = new NativeEventEmitter(nativeModule);
    if (Platform.OS === 'android') {
      AppRegistry.registerHeadlessTask('AirshipAndroidBackgroundEventTask', () => {
        return () => this.dispatchEvents(true);
      });
    }
    this.eventEmitter.addListener('com.airship.pending_events', async () => {
      return this.dispatchEvents(false);
    });
  }
  removeListener(eventType, listener) {
    var typedListeners = this.listeners.get(eventType);
    if (typedListeners) {
      typedListeners = typedListeners.filter(obj => obj !== listener);
      this.listeners.set(eventType, typedListeners);
    }
  }
  addListener(eventType, listener) {
    if (!this.listeners.get(eventType)) {
      this.listeners.set(eventType, new Array());
    }
    this.listeners.get(eventType)?.push(listener);
    this.nativeModule.airshipListenerAdded(eventType);
  }
  removeAllListeners(eventType) {
    this.listeners.set(eventType, new Array());
  }
  async dispatchEvents(isHeadlessJS) {
    let actions = Array.from(this.listeners.keys()).map(async key => {
      let typedListeners = this.listeners.get(key);
      if (typedListeners == null) {
        return Promise.resolve();
      }
      let events = await this.nativeModule.takePendingEvents(key, isHeadlessJS);
      return Promise.all(typedListeners.map(async listener => {
        for (const event of events) {
          await listener(event);
        }
      }));
    });
    return Promise.all(actions);
  }
}

/**
 * A listener subscription.
 */
export class Subscription {
  constructor(onRemove) {
    this.onRemove = onRemove;
  }
  /**
   * Removes the listener.
   */
  remove() {
    this.onRemove();
  }
}
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