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SignalR.
Code, not
toothpaste               Maarten
Realtime client/server   Balliauw
                         Technical Consultant
communication            RealDolmen

                         @maartenballiauw
R
Who am I?
Maarten
Balliauw
@maartenballiauw
Why real-time & how?
Meet SignalR
Connections and Hubs
Clients
Q&A
Why real-time & how?
Twitter – live searches/updates
Stock streamers
Auctions
Live scores
Real-time notifications
Interactive games
Collaborative apps                6
Live user analytics
…
Never designed for real-time communications




 HTML5 WebSockets to the
 rescue, right?
Extension to HTTP
Provide raw sockets over HTTP
Full-duplex
Traverses proxies

It’s still a draft…
Not every proxy server supports it
Not every webserver supports it
Not every browser supports it
They are raw sockets!
HTTP/1.1 200 OK
Content-Type: text/plain
Transfer-Encoding: chunked

<script>eval("... ")</script>0
<script>eval("... ")</script>0
Fiddler
                   hootsuite.com




Polling interval
Fiddler
facebook.com
Options!
Forever Frame
Periodic polling
Long polling
HTML5 WebSockets
(Server-Sent events)
ARRR!
Meet SignalR
Three-in-one!
http://github.com/signalr/signalr
where else!

http://amzn.to/xrzS6j
Hello, SignalR
BONUS DEMO!
Connections and Hubs
PersistentConnection Hubs
Can communicate with 1..N clients   Can communicate with 1..N clients
Is an IHttpHandler                  Abstraction over PersistentConnection
Requires a route to be defined      Route automatically mapped (/signalr/hubs)
Limited to sending messages         Can send messages and call methods
You define the “protocol”           SignalR defines the protocol
Hello, SignalR
hubs
http://jabbr.net
Clients
On the server side


On the client side


But there’s more…
On the server side
        https://github.com/SignalR/SignalR/tree/master/SignalR.SelfHost


On the client side



        Is this a replacement for WCF?
DeckCast
SignalR is three-in-one!



Connections & Hubs
Connect various clients
Make the web realtime!
Install-Package SignalR
http://aka.ms/mbl-tech

http://aka.ms/mbl-tech/devprev

http://aka.ms/mbl-tech/html5
Maarten
      Balliauw
      @maartenballiauw
Q&A
http://blog.maartenballiauw.be

http://github.com/signalr/signalr

http://www.nuget.org/packages?q=signalr

http://github.com/signalr/signalr.websockets

http://vasters.com/clemensv/2012/02/13/SignalR+Powered+By+Service+Bus.aspx

https://github.com/DyKnow/SignalR-ObjC

https://github.com/SignalR/SignalR/pull/127

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SignalR. Code, not toothpaste - TechDays Belgium 2012

Editor's Notes

  1. How do youimplement these today?
  2. That’s a lot of options, a lot of thingsto account forand a lot of different programmingmodels. Are yougoingto do this?Are youstillwriting separategetDocumentByIdandAttachEventmethodstoworkwith the DOM? WhataboutjQuery?
  3. Open VS2010Create a new ASP.NET Empty WebsiteInstall-PackageSignalRNote server library, client script, jQuery dependencyInstall-Package SignalR.Sample and show stock ticker in two browsersNowlet’s take things easy… How does all of thiswork?----------------- without Internet connection ----------------------------Add a class:public class TimeConnection : PersistentConnection{}Add a route:RouteTable.Routes.MapConnection&lt;TimeConnection&gt;(&quot;time&quot;, &quot;time/{*operation}&quot;); Addaninfinite loop:ThreadPool.QueueUserWorkItem(_ =&gt; { var connection = Connection.GetConnection&lt;TimeConnection&gt;();while (true) {connection.Broadcast(DateTime.Now.ToString());Thread.Sleep(1000); } });Addsome HTML:&lt;!DOCTYPE html&gt;&lt;html xmlns=&quot;http://www.w3.org/1999/xhtml&quot;&gt;&lt;head&gt; &lt;title&gt;&lt;/title&gt; &lt;script src=&quot;Scripts/jquery-1.6.4.min.js&quot; type=&quot;text/javascript&quot;&gt;&lt;/script&gt; &lt;script src=&quot;Scripts/jquery.signalR.js&quot; type=&quot;text/javascript&quot;&gt;&lt;/script&gt; &lt;script type=&quot;text/javascript&quot;&gt; $(function () { var connection = $.connection(&apos;time&apos;);connection.received(function(data) { $(&apos;h1&apos;).text(&apos;The time is &apos; + data); });connection.start(); }); &lt;/script&gt;&lt;/head&gt;&lt;body&gt; &lt;h1&gt;The time is now!&lt;/h1&gt;&lt;/body&gt;&lt;/html&gt;----------------- without Internet connection --------------------------------------------- with Internet connection ----------------------------Install-Package LinqToTwitterAdd a class:public class TweetsConnection : PersistentConnection{}Add a route:RouteTable.Routes.MapConnection&lt;TweetsConnection&gt;(&quot;tweets&quot;, &quot;tweets/{*operation}&quot;); Addaninfinite loop:ThreadPool.QueueUserWorkItem(_ =&gt; { var connection = Connection.GetConnection&lt;TweetsConnection&gt;();while (true) {using (TwitterContext context = new TwitterContext()) { var tweets = context.Search.Where(t =&gt; t.Type == SearchType.Search &amp;&amp; t.Query == &quot;#test&quot;).SingleOrDefault().Entries;connection.Broadcast(tweets.ToList()); }Thread.Sleep(5000); } });Addsome HTML:&lt;!DOCTYPE html&gt;&lt;html xmlns=&quot;http://www.w3.org/1999/xhtml&quot;&gt;&lt;head&gt; &lt;title&gt;&lt;/title&gt; &lt;script src=&quot;Scripts/jquery-1.6.4.min.js&quot; type=&quot;text/javascript&quot;&gt;&lt;/script&gt; &lt;script src=&quot;Scripts/jquery.signalR.js&quot; type=&quot;text/javascript&quot;&gt;&lt;/script&gt; &lt;script type=&quot;text/javascript&quot;&gt; $(function () { var connection = $.connection(&apos;tweets&apos;);connection.received(function (data) { $(&apos;#tweetsList&apos;).html(&apos;&apos;);for (var i = 0; i &lt; data.length; i++) { $(&apos;#tweetsList&apos;).append($(&apos;&lt;li&gt;&apos; + data[i].Content + &apos;&lt;/li&gt;&apos;)); } });connection.start(); }); &lt;/script&gt;&lt;/head&gt;&lt;body&gt; &lt;h1&gt;Tweets&lt;/h1&gt; &lt;ulid=&quot;tweetsList&quot;&gt;&lt;/ul&gt;&lt;/body&gt;&lt;/html&gt;----------------- with Internet connection ----------------------------Notice we are sending data TO the client?
  4. TweetsusingKnockoutJS
  5. Open the previouslycreated sampleInstall-Package jQuery.UI.CombinedAdd a class: [HubName(&quot;worker&quot;)] public class WorkerHub : Hub { public voidstartProcessing(Event e) {Caller.notify(&quot;We&apos;vestarted processing &quot; + e.EventName);Clients.setProgress(10);for (int i = 0; i &lt;= 100; i++) {SignalR.Hubs.Hub.GetClients&lt;WorkerHub&gt;().setProgress(i);Thread.Sleep(100); } } }Addsome HTML:&lt;!DOCTYPE html&gt;&lt;html xmlns=&quot;http://www.w3.org/1999/xhtml&quot;&gt;&lt;head&gt; &lt;title&gt;&lt;/title&gt; &lt;link rel=&quot;stylesheet&quot; href=&quot;Content/themes/base/jquery.ui.all.css&quot; /&gt; &lt;script src=&quot;Scripts/jquery-1.6.4.min.js&quot; type=&quot;text/javascript&quot;&gt;&lt;/script&gt; &lt;script src=&quot;Scripts/jquery-ui-1.8.16.min.js&quot; type=&quot;text/javascript&quot;&gt;&lt;/script&gt; &lt;script src=&quot;Scripts/jquery.signalR.js&quot; type=&quot;text/javascript&quot;&gt;&lt;/script&gt; &lt;script src=&quot;signalr/hubs&quot; type=&quot;text/javascript&quot;&gt;&lt;/script&gt; &lt;script type=&quot;text/javascript&quot;&gt; $(function () { var workerHub = $.connection.worker; $(&apos;#progressbar&apos;).progressbar({ value: 0 }); $(&apos;#startWorkTrigger&apos;).bind(&apos;click&apos;, function () {workerHub.startProcessing({ eventName: &apos;UAN12&apos; }) .fail(function (e) { alert(&quot;An error occured: &quot; + e); }); });workerHub.notify = function (message) { $(&apos;#notifications&apos;).html(message); };workerHub.setProgress = function (progress) { $(&apos;#progressbar&apos;).progressbar({ value: progress }); }; $.connection.hub.start(); }); &lt;/script&gt;&lt;/head&gt;&lt;body&gt; &lt;div id=&quot;progressbar&quot; style=&quot;width: 200px;&quot;&gt;&lt;/div&gt; &lt;div id=&quot;notifications&quot; style=&quot;width: 200px;&quot;&gt;&lt;/div&gt; &lt;button id=&quot;startWorkTrigger&quot;&gt;Start work&lt;/button&gt;&lt;/body&gt;&lt;/html&gt;
  6. Create a new Windows Phone 7.1 project using the “WP DataBound Application”Install-Package SignalR.Client.WP7Uninstall-Package NewtonSoft.Json -ForceInstall-Package NewtonSoft.Json -Version 4.0.3In MainViewModel, remove the contents in LoadData(): public void LoadData() { if (!connection.IsActive) {connection.Start(); } }Add a field:private Connection connection; In the constructor, preparetoreceive data. Note the Dispatcherto make sure the adding of the data happens on the UI thread: public MainViewModel() {this.Items = new ObservableCollection&lt;ItemViewModel&gt;();connection = new Connection(&quot;http://localhost:6502/tweets&quot;);connection.Received += data =&gt; Deployment.Current.Dispatcher.BeginInvoke(() =&gt; UpdateItems(data));connection.Start(); }Add the UpdateItemsmethod:protectedvoidUpdateItems(string data) {this.Items.Clear();JArray entries = JArray.Parse(data);foreach (JObject entry in entries) { string content = Regex.Replace(entry[&quot;Content&quot;].ToString(), &quot;&lt;.*?&gt;&quot;, string.Empty);this.Items.Add(new ItemViewModel() { LineOne = entry[&quot;Title&quot;].ToString().Substring(0, 12),LineTwo = ((JObject)entry[&quot;Author&quot;])[&quot;Name&quot;].ToString(), LineThree = content }); }this.IsDataLoaded = true; }
  7. Open DeckCastShow peoplearoundandtellthemabout deck.jsShow the presenter mode andclient mode on the webStart a console based viewerStart the WP7 presenter app (focus/unfocus the “sample” box toconnect, click SLOWLY)