Rx API in depth: Hot and Cold observables (Channel 9)

Rx API in depth: Hot and Cold observables

Posted: Dec 14, 2009 at 7:46 AM

By: Jeffrey van Gogh

(3)

39,843 Views

7 Comments

Video format

Option selected may change based on video formats available and browser capability.

Auto

Use our suggested format for this video.

Smooth Streaming

Adaptive bitrate streaming - little buffering but lower video quality at times of low bandwidth. Silverlight 5 required

Progressive

Traditional buffered video format. Silverlight 5 required

HTML5

For browsers that support H.264 MP4 or WebM video playback such as:
IE9+, Firefox 4+, Chrome 5+, or Safari 4+.

Flash

For browsers that have the Adobe Flash Player plugin installed.

In this episode of the Rx API in depth, Wes talks talks about hot and cold Observables.

Visit the Reactive Extensions DevLabs page to download and learn more about Rx.

Follow the Discussion

Follow
Oops, something didn't work.

Try again?

Sign In to be begin to follow these comments

What does this mean?
Following an item on Channel 9 allows you to watch for new content and comments that you are interested in. You need to be signed in to Channel 9 to use this feature.

Getting "follow" information

Stop following these comments

Start following these comments

What does this mean?
Following an item on Channel 9 allows you to watch for new content and comments that you are interested in and view them all on your notifications page.

Removing your "follow"

Setting up your "follow"

Did you know you can
sign up for email notifications?
- Subscribe to this comments

tomkirbygreen

Dec 15, 2009 at 9:50 PM

I'm amazed there don't appear to be any so-called early-access / alpha books on Rx coming from Manning or APress. At least they're not listed yet. I'd really like to find something longer than 'just' a couple of blog postings that really digs into specifically Rx and reactive programming in general in .NET. These videos are great and I'm very grateful they're being make available, however for study purposes nothing beats the one-to-one, deep dive that the printed word delivers. Does anyone know when we might see a Rx book?
head.in.the.box

Dec 16, 2009 at 3:40 PM

That is one of my new year's resolutions.
Bjorg

Dec 16, 2009 at 6:54 PM

I'm curious, what is the origin of the terms "hot" and "cold?" Were other terms considered like "static" vs. "dynamic," or "immutable" vs. "mutable?"
Wes Dyer

Dec 17, 2009 at 1:20 PM

Hot = Running

Cold = Not Running

Static/Dynamic would be misleading. Immutable/Mutable is also misleading. Perhaps, the closest terms are Deferred / Not-Deferred or Latent / Active.

The terms Hot and Cold came from whiteboarding and design sessions where we needed a term to describe the difference between something that running versus something that represents a thing that can be run. We definitely didn't sit down and figure out a vocabulary, these things just happen. I'm sure that at some point in time people will think about standard terminology, but we usually can't wait for that to happen.
LeeCampbell

Jun 13, 2010 at 6:35 AM

As Wes mentioned above, I like to think of them as

Hot = Active

Cold = Passive.

I think we can do better than the explanation JVG gives here.
LeeCampbell

Aug 19, 2010 at 7:03 AM

Ok instead of being part of the problem I thought I would put my 2c in.

Here is my post on Hot vs Cold Observables.

http://leecampbell.blogspot.com/2010/08/rx-part-7-hot-and-cold-observables.html
ghd

Nov 13, 2010 at 12:19 AM

This is a very nice site.I like it very much!