"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.CachedUiSettingsClient = void 0;
var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));
/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

/**
 * {@link IUiSettingsClient} wrapper to ensure uiSettings requested only once within a single KibanaRequest,
 * {@link IUiSettingsClient} has its own cache, but it doesn't cache pending promises, so this produces two requests:
 *
 * const promise1 = uiSettings.get(1); // fetches config
 * const promise2 = uiSettings.get(2); // fetches config
 *
 * And {@link CachedUiSettingsClient} solves it, so this produced a single request:
 *
 * const promise1 = cachedUiSettingsClient.get(1); // fetches config
 * const promise2 = cachedUiSettingsClient.get(2); // reuses existing promise
 *
 * @internal
 */
class CachedUiSettingsClient {
  constructor(client) {
    (0, _defineProperty2.default)(this, "cache", void 0);
    this.client = client;
  }
  async get(key) {
    if (!this.cache) {
      // caching getAll() instead of just get(key) because internally uiSettings calls `getAll()` anyways
      // this way we reuse cache in case settings for different keys were requested
      this.cache = this.client.getAll();
    }
    return this.cache.then(cache => cache[key]).catch(e => {
      this.cache = undefined;
      throw e;
    });
  }
}
exports.CachedUiSettingsClient = CachedUiSettingsClient;