Introducing PubNub – the new cloud-hosted service for real-time messaging

PubNub is a new real-time cloud-based subscribe/publish API, it’s basically a hosted version of APE but we require no servers, minimal setup and a cross-platform API including JS, PHP and C# – perfect!

Let’s get stuck right in with some code examples. We’re going to re-create this post using PubNub but with a C# client, here’s the JavaScript:

White
Red
Blue
Green


		

		

Without going into too much detail, this example includes the PubNub API and subscribes to a channel. Messages are published when we select a colour from the drop down.

Here we have a simple C# console application that also subscribes to the same channel, listening for messages and changing the console background colour on request. Don’t forget to include the PubNub C# API when compiling.

static void Main(string[] args)
        {
            Pubnub pubnub = new Pubnub(
                "demo",
                "demo",
                null,
                false
            );

            List<0bject> history = pubnub.history("ifc0nfig", 1);
            ChangeBackgroundColour(history.First());

            pubnub.subscribe(
                "ifc0nfig",
                delegate(object message) {
                    ChangeBackgroundColour(message);

                    return true;
                }
            );
        }

        static void ChangeBackgroundColour(object message){
            ConsoleColor cc = ConsoleColor.Black;

            // we can't convert an RGB colour to a ConsoleColor so we'll have to set some manually mappings
            if(message.ToString() == "#ffffff") cc = ConsoleColor.White;
            if(message.ToString() == "#ff0000") cc = ConsoleColor.Red;
            if(message.ToString() == "#00ff00") cc = ConsoleColor.Green;
            if(message.ToString() == "#0000ff") cc = ConsoleColor.Blue;

            Console.BackgroundColor = cc;
            Console.Clear();
        }

Go a head, launch the JavaScript client and the C# client – change the background colour and watch the magic happen:

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3. Diving into APE modules and the JSF – creating topics for channels
4. Using jQuery with APE – an OOP approach with the DUI
5. Keeping everything tidy within ASP.NET MVC3 C#; rendering your CSS and JavaScripts in the correct place