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  • A C# implementation of the CallStream pattern

    - by Bertrand Le Roy
    Dusan published this interesting post a couple of weeks ago about a novel JavaScript chaining pattern: http://dbj.org/dbj/?p=514 It’s similar to many existing patterns, but the syntax is extraordinarily terse and it provides a new form of friction-free, plugin-less extensibility mechanism. Here’s a JavaScript example from Dusan’s post: CallStream("#container") (find, "div") (attr, "A", 1) (css, "color", "#fff") (logger); The interesting thing here is that the functions that are being passed as the first argument are arbitrary, they don’t need to be declared as plug-ins. Compare that with a rough jQuery equivalent that could look something like this: $.fn.logger = function () { /* ... */ } $("selector") .find("div") .attr("A", 1) .css("color", "#fff") .logger(); There is also the “each” method in jQuery that achieves something similar, but its syntax is a little more verbose. Of course, that this pattern can be expressed so easily in JavaScript owes everything to the extraordinary way functions are treated in that language, something Douglas Crockford called “the very best part of JavaScript”. One of the first things I thought while reading Dusan’s post was how I could adapt that to C#. After all, with Lambdas and delegates, C# also has its first-class functions. And sure enough, it works really really well. After about ten minutes, I was able to write this: CallStreamFactory.CallStream (p => Console.WriteLine("Yay!")) (Dump, DateTime.Now) (DumpFooAndBar, new { Foo = 42, Bar = "the answer" }) (p => Console.ReadKey()); Where the Dump function is: public static void Dump(object options) { Console.WriteLine(options.ToString()); } And DumpFooAndBar is: public static void DumpFooAndBar(dynamic options) { Console.WriteLine("Foo is {0} and bar is {1}.", options.Foo, options.Bar); } So how does this work? Well, it really is very simple. And not. Let’s say it’s not a lot of code, but if you’re like me you might need an Advil after that. First, I defined the signature of the CallStream method as follows: public delegate CallStream CallStream (Action<object> action, object options = null); The delegate define a call stream as something that takes an action (a function of the options) and an optional options object and that returns a delegate of its own type. Tricky, but that actually works, a delegate can return its own type. Then I wrote an implementation of that delegate that calls the action and returns itself: public static CallStream CallStream (Action<object> action, object options = null) { action(options); return CallStream; } Pretty nice, eh? Well, yes and no. What we are doing here is to execute a sequence of actions using an interesting novel syntax. But for this to be actually useful, you’d need to build a more specialized call stream factory that comes with some sort of context (like Dusan did in JavaScript). For example, you could write the following alternate delegate signature that takes a string and returns itself: public delegate StringCallStream StringCallStream(string message); And then write the following call stream (notice the currying): public static StringCallStream CreateDumpCallStream(string dumpPath) { StringCallStream str = null; var dump = File.AppendText(dumpPath); dump.AutoFlush = true; str = s => { dump.WriteLine(s); return str; }; return str; } (I know, I’m not closing that stream; sure; bad, bad Bertrand) Finally, here’s how you use it: CallStreamFactory.CreateDumpCallStream(@".\dump.txt") ("Wow, this really works.") (DateTime.Now.ToLongTimeString()) ("And that is all."); Next step would be to combine this contextual implementation with the one that takes an action parameter and do some really fun stuff. I’m only scratching the surface here. This pattern could reveal itself to be nothing more than a gratuitous mind-bender or there could be applications that we hardly suspect at this point. In any case, it’s a fun new construct. Or is this nothing new? You tell me… Comments are open :)

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  • index.html in subdirectory will not open

    - by Dušan
    I want to have a website structure like this example.com/ - homepage example.com/solutions/ - this will be the solution parent page example.com/solutions/solution-one - child solution page example.com/solutions/solution-two- child solution page i have setup the example.com/solutions/index.html file so it can be opened as a parent page, but is shows me an error You don't have permission to access /solutions/.html on this server. What is the problem to this, how can i open parent, directory page? I na just using regular html pages, no cms or anything...

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  • "Language support" icon missing in System Settings

    - by dusan
    The "Language Support" icon from the System settings has disappeared: (Also I can't find it from Dash) The last thing I've done was changing the keyboard input method system to "ibus". I tried to execute gnome-control-center directly in the command line, expecting to see errors in the output, but there is no console output. Where can I start looking for the cause? Can I call the "Language Support" option directly from command line?

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  • Making Modular, Reusable and Loosely Coupled MVC Components

    - by Dusan
    I am building MVC3 application and need some general guidelines on how to manage complex client side interaction between my components. Here is my definition of one component in general way: Component which has it's own controller, model and view. All of the component's logic is placed inside these three parts and component is sort of "standalone", it contains it's own form, data needed for interaction, updates itself with Ajax and so on. Beside this internal logic and behavior of the component, it needs to be able to "Talk" to the outside world. By this I mean it should provide data and events (sort of) so when this component gets embedded in pages can notify other components which then can update based on the current state and data. I have an idea to use client ViewModel (in java-script) which would hookup all relevant components on page and control interaction between them. This would make components reusable, modular - independent of the context in which they are used. How would you do this, I am a bit stuck as I do not know if this is a good approach and there is a technical possibility to achieve this using java-script/jquery. The confusing part is about update via Ajax, how to ensure that component is properly linked to ViewModel when component is Ajax updated (or even worse removed or dynamically added). Also, how should this ViewModel be constructed and which technicalities to use here and in components to work as synergy??? On the web, I have found the various examples of the similar approach, but they are oversimplified (even for dummies) or over specific and do not provide valuable resource or general solution for this kind of implementation. If you have some serious examples it would be, also, very helpful. Note: My aim is to make interactions between many components on the same page simpler and more robust and elegant.

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  • Tracking first visit date in Google Analytics

    - by dusan
    I want track a site's visitor retention using Google Analytics, to see if unregistered users are returning to it, within a time frame of 2+ months from now. This blog post seems to be on the right track, but I want to track unregistered users, so I don't have a "join date" or similar variable at my disposal. This other blog post suggests using all 5 GA custom variables, using the first variable slot on the first week, variable 2 on week 2, etc. This method will allow me to track 5 weeks of visitors. I want to track more than 5 weeks of visitors, so I was thinking on using two custom variables in GA: visitor's first visit date, and visitor's last visit date. How I can save the first visit date? Because if I save another value in the same slot the old value will be overwritten, and I don't know how reliable is to save that variable conditionally (reading the __utmv cookie to check whether the "first visit date" is set, if it isn't set I save the current date)

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  • Floating child window in WPF

    - by Dusan Kocurek
    I want to create floating child window in .NET 3.0 WPF application. What I'm doing is: sideWindow = new SideWindow(this); sideWindow.Left = System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width - sideWindow.Width; sideWindow.Top = 125; sideWindow.WindowStartupLocation = WindowStartupLocation.Manual; sideWindow.Owner = this; sideWindow.Show(); This is running fine except one customer. According to trace messages the window is created, but the client doesn't see it! Any idea about similar problems? Thank you very much.

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  • Passing URL as parameter using mod_rewrite

    - by Dusan
    I would like to rewrite dynamic URL /index.php?pid=login&redirect=/previous-page.html to something like this /login.html-r-previous-page.html I tried this RewriteRule ^login.html-r-(.*)$ /index.php?pid=login&redirect=$1 [L] But no succes. I was also trying to change the regex to .+ or some other forms, but it seems useless. Maybe I am making mistake somewhere else. I am new to regular expressions and also mod_rewrite. Thank you for help

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  • A C# implementation of the CallStream pattern

    Dusan published this interesting post a couple of weeks ago about a novel JavaScript chaining pattern: http://dbj.org/dbj/?p=514 Its similar to many existing patterns, but the syntax is extraordinarily terse and it provides a new form of friction-free, plugin-less extensibility mechanism. Heres a JavaScript example from Dusans post: CallStream("#container") (find, "div") (attr, "A", 1) (css, "color", "#fff") ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • sed replacement does not work

    - by Robin Hood
    Hello, I have trouble using sed. I need to replace some lines in very deprecated HTML sites which consist of many files. My script does not work and I do not why. When I tried to find exact pattern with Netbeas it worked. find . -type f -name "*.htm?" -exec sed -i -r 's/ing\. Šuhajda Dušan\, Mírová 767\, 518 01 Dobruška\, \+420 737 980 333\,/REPLACEMENT/g' {} \; Where is the mistake? Is there an alternative to replace text without searching regular expression but plain text? Thanks for any respond.

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  • Setting up Edimax EW-7206APg as Universal Repeater

    - by Ondra Žižka
    Hi, I've troubles setting up Edimax EW-7206APg as a Universal Repeater. I've read few manuals, but they are unclear on certain points. I've managed the repeater to get to a state when it's in a "connected" state. I've set the same WPA passphrase as the router has because I haven't seen any other place to set it at. These are my settings: System Uptime 0day:1h:33m:11s Hardware Version Rev. A Runtime Code Version 1.32 Wireless Configuration Mode Universal Repeater ESSID edimax Channel Number 6 Security WPA-shared key BSSID 00:c0:9f:40:bd:38 Associated Clients 0 Wireless Repeater Interface Configuration ESSID Dusan Security WPA BSSID 00:4f:62:23:8f:7e State Connected LAN Configuration IP Address 192.168.0.10 Subnet Mask 255.255.255.0 Default Gateway 192.168.0.1 MAC Address 00:c0:9f:40:bd:37 This is ipconfig /all: Prípona DNS podle pripojení . . . : riomail.cz Popis . . . . . . . . . . . . . . : Intel(R) PRO/Wireless 2200BG Network Connection Fyzická Adresa. . . . . . . . . . : 00-0E-35-3D-77-68 Protokol DHCP povolen . . . . . . : Ano Automatická konfigurace povolena : Ano Adresa IP . . . . . . . . . . . . : 192.168.0.5 Maska podsíte . . . . . . . . . . : 255.255.255.0 Výchozí brána . . . . . . . . . . : 192.168.0.1 Server DHCP . . . . . . . . . . . : 192.168.0.1 Servery DNS . . . . . . . . . . . : 94.74.192.252 94.74.192.244 I can ping the repeater, I can ping the root AP, but not a DNS server or any other IP beyond the root AP. Anyone has an idea what's wrong? Thanks, Ondra

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