webappengine/bower_components/rxjs/modules/rx-lite-backpressure/rx.lite.backpressure.js

A web application platform that can host multiple web apps running with Node.js.

// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.

;(function (factory) {
  var objectTypes = {
    'function': true,
    'object': true
  };

  var
    freeExports = objectTypes[typeof exports] && exports && !exports.nodeType && exports,
    freeSelf = objectTypes[typeof self] && self.Object && self,
    freeWindow = objectTypes[typeof window] && window && window.Object && window,
    freeModule = objectTypes[typeof module] && module && !module.nodeType && module,
    moduleExports = freeModule && freeModule.exports === freeExports && freeExports,
    freeGlobal = freeExports && freeModule && typeof global == 'object' && global && global.Object && global;

  var root = root = freeGlobal || ((freeWindow !== (this && this.window)) && freeWindow) || freeSelf || this;

  // Because of build optimizers
  if (typeof define === 'function' && define.amd) {
    define(['rx-lite'], function (Rx, exports) {
      return factory(root, exports, Rx);
    });
  } else if (typeof module === 'object' && module && module.exports === freeExports) {
    module.exports = factory(root, module.exports, require('rx-lite'));
  } else {
    root.Rx = factory(root, {}, root.Rx);
  }
}.call(this, function (root, exp, Rx, undefined) {

  // References
  var Observable = Rx.Observable,
    observableProto = Observable.prototype,
    AnonymousObservable = Rx.AnonymousObservable,
    AbstractObserver = Rx.internals.AbstractObserver,
    CompositeDisposable = Rx.CompositeDisposable,
    Notification = Rx.Notification,
    Subject = Rx.Subject,
    Observer = Rx.Observer,
    disposableEmpty = Rx.Disposable.empty,
    disposableCreate = Rx.Disposable.create,
    inherits = Rx.internals.inherits,
    addProperties = Rx.internals.addProperties,
    timeoutScheduler = Rx.Scheduler.timeout,
    currentThreadScheduler = Rx.Scheduler.currentThread,
    identity = Rx.helpers.identity,
    isScheduler = Rx.Scheduler.isScheduler,
    isFunction = Rx.helpers.isFunction,
    checkDisposed = Rx.Disposable.checkDisposed;

  var errorObj = {e: {}};
  var tryCatchTarget;
  function tryCatcher() {
    try {
      return tryCatchTarget.apply(this, arguments);
    } catch (e) {
      errorObj.e = e;
      return errorObj;
    }
  }
  function tryCatch(fn) {
    if (!isFunction(fn)) { throw new TypeError('fn must be a function'); }
    tryCatchTarget = fn;
    return tryCatcher;
  }
  function thrower(e) {
    throw e;
  }

  var StopAndWaitObservable = (function (__super__) {

    function subscribe (observer) {
      this.subscription = this.source.subscribe(new StopAndWaitObserver(observer, this, this.subscription));

      var self = this;
      timeoutScheduler.schedule(function () { self.source.request(1); });

      return this.subscription;
    }

    inherits(StopAndWaitObservable, __super__);

    function StopAndWaitObservable (source) {
      __super__.call(this, subscribe, source);
      this.source = source;
    }

    var StopAndWaitObserver = (function (__sub__) {

      inherits(StopAndWaitObserver, __sub__);

      function StopAndWaitObserver (observer, observable, cancel) {
        __sub__.call(this);
        this.observer = observer;
        this.observable = observable;
        this.cancel = cancel;
      }

      var stopAndWaitObserverProto = StopAndWaitObserver.prototype;

      stopAndWaitObserverProto.completed = function () {
        this.observer.onCompleted();
        this.dispose();
      };

      stopAndWaitObserverProto.error = function (error) {
        this.observer.onError(error);
        this.dispose();
      }

      stopAndWaitObserverProto.next = function (value) {
        this.observer.onNext(value);

        var self = this;
        timeoutScheduler.schedule(function () {
          self.observable.source.request(1);
        });
      };

      stopAndWaitObserverProto.dispose = function () {
        this.observer = null;
        if (this.cancel) {
          this.cancel.dispose();
          this.cancel = null;
        }
        __sub__.prototype.dispose.call(this);
      };

      return StopAndWaitObserver;
    }(AbstractObserver));

    return StopAndWaitObservable;
  }(Observable));


  /**
   * Attaches a stop and wait observable to the current observable.
   * @returns {Observable} A stop and wait observable.
   */
  ControlledObservable.prototype.stopAndWait = function () {
    return new StopAndWaitObservable(this);
  };

  var WindowedObservable = (function (__super__) {

    function subscribe (observer) {
      this.subscription = this.source.subscribe(new WindowedObserver(observer, this, this.subscription));

      var self = this;
      timeoutScheduler.schedule(function () {
        self.source.request(self.windowSize);
      });

      return this.subscription;
    }

    inherits(WindowedObservable, __super__);

    function WindowedObservable(source, windowSize) {
      __super__.call(this, subscribe, source);
      this.source = source;
      this.windowSize = windowSize;
    }

    var WindowedObserver = (function (__sub__) {

      inherits(WindowedObserver, __sub__);

      function WindowedObserver(observer, observable, cancel) {
        this.observer = observer;
        this.observable = observable;
        this.cancel = cancel;
        this.received = 0;
      }

      var windowedObserverPrototype = WindowedObserver.prototype;

      windowedObserverPrototype.completed = function () {
        this.observer.onCompleted();
        this.dispose();
      };

      windowedObserverPrototype.error = function (error) {
        this.observer.onError(error);
        this.dispose();
      };

      windowedObserverPrototype.next = function (value) {
        this.observer.onNext(value);

        this.received = ++this.received % this.observable.windowSize;
        if (this.received === 0) {
          var self = this;
          timeoutScheduler.schedule(function () {
            self.observable.source.request(self.observable.windowSize);
          });
        }
      };

      windowedObserverPrototype.dispose = function () {
        this.observer = null;
        if (this.cancel) {
          this.cancel.dispose();
          this.cancel = null;
        }
        __sub__.prototype.dispose.call(this);
      };

      return WindowedObserver;
    }(AbstractObserver));

    return WindowedObservable;
  }(Observable));

  /**
   * Creates a sliding windowed observable based upon the window size.
   * @param {Number} windowSize The number of items in the window
   * @returns {Observable} A windowed observable based upon the window size.
   */
  ControlledObservable.prototype.windowed = function (windowSize) {
    return new WindowedObservable(this, windowSize);
  };

  /**
   * Pipes the existing Observable sequence into a Node.js Stream.
   * @param {Stream} dest The destination Node.js stream.
   * @returns {Stream} The destination stream.
   */
  observableProto.pipe = function (dest) {
    var source = this.pausableBuffered();

    function onDrain() {
      source.resume();
    }

    dest.addListener('drain', onDrain);

    source.subscribe(
      function (x) {
        !dest.write(String(x)) && source.pause();
      },
      function (err) {
        dest.emit('error', err);
      },
      function () {
        // Hack check because STDIO is not closable
        !dest._isStdio && dest.end();
        dest.removeListener('drain', onDrain);
      });

    source.resume();

    return dest;
  };

    return Rx;
}));