Broadcasting music from the cloud

itcampro@ itcamp13# Premium conference on Microsoft technologies

Broadcasting Music from the Cloud

Andy CrossWindows Azure MVP

Elastacloud@andybareweb

blog.elastacloud.com


Private & Public CloudHuge thanks to our sponsors!


Private & Public Cloud

• Real Time Web• Social media is the new telephone• Spotify API• Synchronicity • SignalR• Windows Azure Websites• Service Bus• ROCK!!!

Agenda


REAL TIME WEBWhat is the

Any sufficiently advanced technology is indistinguishable from magic.

Arthur C Clarke



• A history!– HTML– Javascript– Iframes– XmlHttp– AJAX– JSONP–Web Sockets

Real Time Web

Propensity to push


Facebooks’ Real Time WebFacebook has multiple real time web features, such as the news feed and messaging


Twitters’ Real Time WebTwitter is perhaps the ultimate in real time web opportunities, but even it struggles with *n more tweets*



• With great advantages– Instant messaging– Responsive user interfaces– Collaboration and sharing

• Come some great problems– Scalability• Concurrent connections• Server load

– Complexity of client

Real time web pitfalls


SOCIAL MEDIAIf you want to share music, the 1990s were better than



• Billions of users of facebook• Imagine sharing music on there. – READY. STEADY. GO!!!

• My real time is not your real time• If we want to build engagement on– Brand– Concept–Movement

• we must engage simultaneously

Social Media


Private & Public CloudThe Real Time Web


SPOTIFYBroadcast Music to



• Spotify is a 4 year old ‘start up’– Streaming music– Integrated apps

• Apps are written in HTML5 and JS– Chromium Embedded

• Its API for apps gives every song a URI– spotify:track:12345679abc

• We will distribute these URIs along with a Play command

Spotify



function playTrack(data) { console.log(data); player.playTrack(models.Track.fromURI(data)).done(function () { //this is a promise update the ui maybe });

Example Spotify code



• Introducing Goose• Geese fly together.• Geese fly in flocks.• There is a lead goose in the flock• The rest are tail geese.• Geese honk• Geese sing• Geese flap

Using the Real Time Web to fix this


SYNCHRONICITY?But how do we achieve



• We can send a Play command to individuals.

• How can we combine the Real Time Web with this?

My real time is not your real time



• We cannot just send PLAY commands–What if we join part way through a song– Nothing would be played until we

completed the song

• We also track the LEAD GOOSE’s position

My real time is not your real time


ASP.NET SIGNALRTechnologies for the Real Time Web


Private & Public CloudWhat does SignalR try to fix?

Got Data?Got Data?Got Data?Got Data?

Here’s some data!

Got Data?Got Data?Got Data?

Got Data?

ServerClient


Private & Public CloudHow does it fix it?

ServerClient

I do real time, do you?

Yeah, dude!

Let’s Party in Real-time!


Private & Public CloudComponents


WINDOWS AZURE WEBSITES

Scalable Hosting



• Start on Free – And continue for dev/test

• Production uses Reserved Mode– Custom URL– Scalable as easily as:

Not a lightweight option


SERVICE BUS BACKPLANESignalR scale out


Private & Public CloudScaling with the Service Bus


ROCK! HONK! Enough talk!


Q & A

Technology

Broadcasting music from the cloud