"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.shareWeakReplay = shareWeakReplay;

var Rx = _interopRequireWildcard(require("rxjs"));

var _operators = require("rxjs/operators");

function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }

/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/**
 * Just like the [`shareReplay()`](https://rxjs-dev.firebaseapp.com/api/operators/shareReplay) operator from
 * RxJS except for a few key differences:
 *
 * - If all downstream subscribers unsubscribe the source subscription will be unsubscribed.
 *
 * - Replay-ability is only maintained while the source is active, if it completes or errors
 *   then complete/error is sent to the current subscribers and the replay buffer is cleared.
 *
 * - Any subscription after the the source completes or errors will create a new subscription
 *   to the source observable.
 *
 * @param bufferSize Optional, default is `Number.POSITIVE_INFINITY`
 */
function shareWeakReplay(bufferSize) {
  return function (source) {
    var subject;
    var stop$ = new Rx.Subject();
    return new Rx.Observable(function (observer) {
      if (!subject) {
        subject = new Rx.ReplaySubject(bufferSize);
      }

      subject.subscribe(observer).add(function () {
        if (!subject) {
          return;
        }

        if (subject.observers.length === 0) {
          stop$.next();
        }

        if (subject.closed || subject.isStopped) {
          subject = undefined;
        }
      });

      if (subject && subject.observers.length === 1) {
        source.pipe((0, _operators.takeUntil)(stop$)).subscribe(subject);
      }
    });
  };
}