@data-client/core/legacy/manager/SubscriptionManager.js

Async State Management without the Management. REST, GraphQL, SSE, Websockets, Fetch

import { SUBSCRIBE, UNSUBSCRIBE } from '../actionTypes.js';
import Controller from '../controller/Controller.js';

/** Interface handling a single resource subscription */

/** The static class that constructs Subscription */

/** Handles subscription actions -> fetch or set actions
 *
 * Constructor takes a SubscriptionConstructable class to control how
 * subscriptions are handled. (e.g., polling, websockets)
 *
 * @see https://dataclient.io/docs/api/SubscriptionManager
 */
export default class SubscriptionManager {
  constructor(Subscription) {
    this.subscriptions = {};
    this.controller = new Controller();
    this.middleware = controller => {
      this.controller = controller;
      return next => action => {
        switch (action.type) {
          case SUBSCRIBE:
            try {
              this.handleSubscribe(action);
            } catch (e) {
              console.error(e);
            }
            return Promise.resolve();
          case UNSUBSCRIBE:
            this.handleUnsubscribe(action);
            return Promise.resolve();
          default:
            return next(action);
        }
      };
    };
    this.Subscription = Subscription;
  }
  /** Ensures all subscriptions are cleaned up. */
  cleanup() {
    for (const key in this.subscriptions) {
      this.subscriptions[key].cleanup();
    }
  }

  /** Called when middleware intercepts 'rdc/subscribe' action.
   *
   */
  handleSubscribe(action) {
    const key = action.key;
    if (key in this.subscriptions) {
      const frequency = action.endpoint.pollFrequency;
      this.subscriptions[key].add(frequency);
    } else {
      this.subscriptions[key] = new this.Subscription(action, this.controller);
    }
  }

  /** Called when middleware intercepts 'rdc/unsubscribe' action.
   *
   */
  handleUnsubscribe(action) {
    const key = action.key;

    /* istanbul ignore else */
    if (key in this.subscriptions) {
      const frequency = action.endpoint.pollFrequency;
      const empty = this.subscriptions[key].remove(frequency);
      if (empty) {
        delete this.subscriptions[key];
      }
    } else if (process.env.NODE_ENV !== 'production') {
      console.error(`Mismatched unsubscribe: ${key} is not subscribed`);
    }
  }
}
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