historicalscheduler.md

Rx.HistoricalScheduler class

Ⓢ

Provides a virtual time scheduler that uses an optional Date for absolute time and time spans for relative time. This inherits from the Rx.VirtualTimeScheduler class.

Usage

The following shows an example of using the Rx.HistoricalScheduler. This shows creating a minute's worth of data from January 1st, 1970.

// Initial data
var initialDate = 0;
var scheduler = new Rx.HistoricalScheduler(new Date(initialDate));

// Yield unto this subject
var s = new Rx.Subject();

// Some random data
function getData(time) {
  return Math.floor(Math.random() * (time + 1));
}

// Enqueue 1 minute's worth of data
while (initialDate <= 60000) {

  (function (i) {

    scheduler.scheduleFuture(new Date(i), function () {
      s.onNext({ value: getData(i), date: new Date(i) });
    });

  }(initialDate));

  initialDate += 10000;
}

// Subscription set
s.subscribe(function (x) {
  console.log('value: ', x.value);
  console.log('date: ', x.date.toGMTString());
});

// Run it
scheduler.start();

// => value: 0
// => date: Thu, 1 Jan 1970 00:00:00 UTC
// => value: 2013
// => date: Thu, 1 Jan 1970 00:00:10 UTC
// => value: 5896
// => date: Thu, 1 Jan 1970 00:00:20 UTC
// => value: 5415
// => date: Thu, 1 Jan 1970 00:00:30 UTC
// => value: 13411
// => date: Thu, 1 Jan 1970 00:00:40 UTC
// => value: 15518
// => date: Thu, 1 Jan 1970 00:00:50 UTC
// => value: 51076
// => date: Thu, 1 Jan 1970 00:01:00 UTC

Location

File:

• /src/core/concurrency/historicalscheduler.js

Dist:

• rx.all.js
• rx.all.compat.js
• rx.virutaltime.js

NPM Packages:

• rx

NuGet Packages:

• RxJS-All
• RxJS-VirtualTime

Unit Tests:

• /tests/concurrency/historicalscheduler.js

HistoricalScheduler Constructor

• constructor

Inherited Classes

• Rx.VirtualScheduler

HistoricalScheduler Constructor

Rx.HistoricalScheduler([initialClock], [comparer])

Ⓢ

Creates a new historical scheduler with the specified initial clock value.

Arguments

1. [initialClock] (Function): Initial value for the clock.
2. [comparer] (Function): Comparer to determine causality of events based on absolute time.

Example

function comparer (x, y) {
  if (x > y) { return 1; }
  if (x < y) { return -1; }
  return 0;
}

var scheduler = new Rx.HistoricalScheduler(
  new Date(0),  /* initial clock of 0 */
  comparer      /* comparer for determining order */
);