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• Publish/Subscribe paradigm: Why must message classes not know about their subscribers?

  - by carleeto

  From Wikipedia: "Publish/subscribe (or pub/sub) is a messaging paradigm where senders (publishers) of messages are not programmed to send their messages to specific receivers (subscribers). Rather, published messages are characterized into classes, without knowledge of what (if any) subscribers there may be" I can understand why a sender must not be programmed to send its message to a specific receiver. But why must published messages be classes that do not have knowledge of their subscribers? It would seem that once the messaging system itself is in place, what typically changes as software evolves is the messages sent, the publishers and the receivers. Keeping the messages separate from the subscribers seems to imply that the subscription model might also change. Is this the reason? Also, does this occur in the real world? I realize this may be a basic question, but I'm trying to understand this paradigm and your replies are very much appreciated.

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• SVN tool to rebase a branch in git style

  - by timmow

  Are there any tools available that will let me rebase in git style an SVN branch onto a new parent? So, in the following situation, I create a feature branch, and there are commits to the trunk E---F---G Feature / A---B---C---D--H--I trunk I'm looking for a tool which copies the trunk, and applies the commits one by one, letting me resolve any conflicts if any exist - but each commit retains the same commit message, and is still a separate commit. E'---F'---G' Feature / A---B---C---D--H--I trunk So commit E' will be a commit with the same changes as E, except in the case of E causing a conflict, in which case E' will differ from E in that E' has the conflicts resolved, and the same commit message as E. I'm looking for this as it helps in keeping branches up to date with trunk - the svnmerge.py / mergeinfo way does not help, as you still need to resolve your changes when you merge back to trunk.

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• c# class design - what can I use instead of "static abstract"?

  - by Ryan

  I want to do the following public abstract class MyAbstractClass { public static abstract int MagicId { get; } public static void DoSomeMagic() { // Need to get the MagicId value defined in the concrete implementation } } public class MyConcreteClass : MyAbstractClass { public static override int MagicId { get { return 123; } } } However I can't because you can't have static abstract members. I understand why I can't do this - any recommendations for a design that will achieve much the same result? (For clarity - what I am trying to do is provide a library with an abstract base class but the concrete versions MUST implement a few properties/methods themselves and yes, there are good reasons for keeping it static.)

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• Is it possible to implement a lightweight database using Blackberry Persistance options?

  - by Tobias

  First I would like to explain why I want to use alternate Blackberry Persistance options rather than a Blackberry database itself, say SQLite. The reason is that the application i'm designing, I want it to be used in all the previous versions of Blackberry rather than just the ones having OS 5.0 or greater. Now, coming back to the actual question, I have got a database that I want to replicate to be used in the Blackberry application. The database has 8 tables and each table has approximately 12 different columns. One of the table has 1000 rows. Now if I was to implement this DB for a Blackberry application , keeping in mind that it will work on all the versions of Blackberry, what would be the best way to implement it?

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• PHP: Auto Updating subscriptions?

  - by Duncan Palmer

  Hey guys I am currently making a website and I am hopefully going to start a premium service for it. What I am currently looking into right now is how to make an "auto updating" shop which removes 1 day from how many days left the user has left on their premium status. so for example if the users purchases 30 days of premium, each day that 30 with negate 1 so.. 30, 29, 28, 27.. etc and then if the days gets to 0 in will remove premium status. The only way I can think of keeping track of this right now is by manually monitoring each persons premium status but that wouldnt be very practical. What would the best way for me to do this? (hopefully "automatically") Thanks.

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• Using .htaccess to rewrite dynamic subdomains

  - by brokekidweb

  I'm currently using .htaccess to rewrite on my website to create dynamic subdomains. I also use it to remove the .php extension on all pages. However, once inside the subdomain, it tries to redirect again. For example, if you went to https://admin.example.com/test, it would actually be accessing https://example.com/clients/admin/test.php. I keeping getting various 404 errors using the following .htaccess file: Options +MultiViews Options +FollowSymLinks RewriteEngine On RewriteRule ^subdomains/(.*)/(.*) http://$1.example.com/$2 [r=301,nc] RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^([^\.]+)$ $1.php [NC,L] RewriteCond %{HTTP_HOST} !^(www\.)?example\.com$ [NC] RewriteCond %{HTTP_HOST} ^(www\.)?([^\.]+)\.example\.com$ [NC] RewriteCond %{DOCUMENT_ROOT}/%2%{REQUEST_URI}/ -d RewriteRule [^/]$ %{REQUEST_URI}/ [R=301,L] RewriteCond %{ENV:REDIRECT_STATUS} ^$ RewriteCond %{HTTP_HOST} !^(www\.)?example\.com$ [NC] RewriteCond %{HTTP_HOST} ^(www\.)?([^\.]+)\.example\.com$ [NC] RewriteRule ^(.*)$ clients/%2/$1 [QSA,L] How can I keep this from redirecting to https://admin.example.com/clients/admin/test.php?

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• How do I search git history for a disappeared line?

  - by skiphoppy

  I need to search the history of a file in a git repository to find a line that is gone. The commit message will not have any relevant text to search on. What command do I use? Further details: this is the history of my todo list out of our non-stellar task tracking software. I've been keeping it for two years because there's just not enough information kept for me in the software. My commit messages usually have only the task ids, unfortunately, and what I need to do is find a closed task by subject, not by number. Yes, the real solution is better task tracking software, but that is completely out of my hands.

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• Best place/area to store file for Trail period

  - by hotveryspicy

  I need to have a trial period (7 days) in my application. From this I came to know that you can do that by keeping permanent file, database or shared preference. Where do I keep that file so that the user isn't able to see/delete it. If I put that logic in Sharedpreference or a file with a path "data/data/packagename", when the application is uninstalled then all history will be lost. Any other workaround/ideas? Note: there is no server, application works locally with no Internet.

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• Username correct, password incorrect?

  - by jonnnnnnnnnie

  In a login system, how can you tell if the user has entered the password incorrectly? Do you perform two SQL queries, one to find the username, and then one to find the username and matching (salted+hashed etc) password? I'm asking this because If the user entered the password incorrectly, I want to update the failed_login_attempts column I have. If you perform two queries wouldn't that increase overhead? If you did a query like this, how would you tell if the password entered was correct or not, or whether the username doesn't exist: SELECT * FROM author WHERE username = '$username' AND password = '$password' LIMIT 1 ( ^ NB: I'm keeping it simple, will use hash and salt, and will sanitize input in real one.) Something like this: $user = perform_Query() // get username and password? if ($user['username'] == $username && $user['password'] == $password) { return $user; } elseif($user['username'] == $username && $user['password'] !== $password) { // here the password doesn't match // update failed_login_attemps += 1 }

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• sites integration

  - by bassem ala

  hey anyone had this task before ? suppose you have a website called www.a.com and a second www.b.com the the a.com have a button. when you logged in to a.com and click the button you will be send to b.com the question is how can i do this while keeping the credentials of the user when he is sent to b.com i want him automatically logged in to b.com ...PS: every user has an account in a.com he definitely should have an account in b.com .... any ideas please???.... thank u for you ideas and supports :)

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• Jquery to slide on load

  - by Pexsol

  I have a simple slider that works on click. How can I automate it so it runs automatically yet keeping the click function as it is? $(document).ready(function() { var currentPosition = 0; var slideHeight = 360; var slides = $('.main-item'); var numberOfSlides = slides.length; var tracker = 0; $('.slider-height').css('height', slideHeight * numberOfSlides); $('.slide-option li a').click(function() { tracker = $('.slide-option li a').index($(this)); $('.slide-option li a').removeClass('current-item'); $(this).addClass('current-item'); //alert(tracker); $('.slider-height').animate({ 'top': slideHeight * (-tracker) }); return false; //alert(tracker); }); });

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• Class library modification / migration

  - by Clint

  I have 3 class libraries. A BBL, a DAL, and a DATA (about 15 datasets). Currently 4 [major] applications utilize the functionality in these DLL's. I'm rewriting one of those applications and I need to (1) Use some of the existing functionality in the libraries (2) Change some of it (3) Add new functionality (4) Add new datasets. I'm back and forth about the best way to do this, while keeping my risks at a minimum. Some thoughts.. 1) Use the existing projects and don't make any modifications, only additions 2) Make new libraries, bring over the code I can use, and make additions as needed 3) Implement partial classes in the existing projects Eventually all 4 applications will use the newest functionality, but it will be a slow migration; so the old code can't be depricated yet. Any thoughts?

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• What's the best way to do Ruby gemspec creation and dependency management?

  - by John Feminella

  Over the last few months, there have been a number of rapid developments in the state of Ruby dependency management and gem creation, to the point where I've been having trouble keeping up with everything. If I'm writing a new gem, what's the best tool for me to use to create my gemspec? Are there disadvantages of using this tool over competitors? I've used Bundler a few times on applications and for me it's been a lifesaver. Is the consensus that it is suitable for use with production apps? Are there quirks or idiosyncracies people should be aware of? Links to resources you've used and have found helpful would also be much appreciated.

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• how to make text appear when you hover at a particular area?

  - by Michael

  I'm mainly using c++ win32 API project and the question is asked keeping in mind: When you use microsoft visual studio 2010 visual c++ editor and you minimize any function, then ahead of the function you get a box; hovering over which you see the entire function. How to implement this in c++ win32 API ? for ex- when a win32 project is created in vs2010, and empty project checkbox is unchecked then by default you get a code which after running produces a window which has a menu bar containing File an Help. Now i want some text to come when i hover over each of them. I do not want a code just a hint how it can be done. Thanks in advance.

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• DB fields not showing up in association custom queries?

  - by Kevin

  I have a notification list that the user can select different show options for different kinds of notifications along with how many results are returned. I'm keeping them in the user model because I want the custom sort to stay with the user between sessions. Here is the association in my user model: has_many :notifications, :class_name => "Notification", :foreign_key => "user_id", :conditions => ["won = ? and lost = ? and paid = ?", self.prefs_won, self.prefs_lost, self.prefs_paid], :limit => self.prefs_results.to_s But when I use the above code, Rails throws me an "unknown method" error for self.prefs_won. It is definitely a field in my database and set as a boolean value, but Rails can't find it... what's the problem?

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• What sort of schema can I use to accommodate manual date based data entries?

  - by meder

  I have an admin where users from multiple properties can enter in monthly statistics for twitter/facebook followers. We do not have access to the real data/db so this is why a manual entry. The form looks like this: Type ( radio, select **one** only ): - Twitter - Facebook Followers/Fans ( textfield ): Property (dropdown): Hotel A, Hotel B Date Start: mm/dd/yyyy (textfield) Date End: mm/dd/yyyy (textfield) Question 1.1: Since I am only keeping track of month per month, the date start/end fields which I have already created might be too specific. Would it be a better idea just to have a start month/year and and month/year if that's the only thing I care about? Question 1.2: What schema could I use for month to month statistics if I were to change the date start and end textfields to start month/year and end month/year dropdowns?

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• Ensuring uniqueness on a varchar greater than 255 in MYSQL/InnoDB

  - by Vijay Boyapati

  I have a table which contains HTML entries for news pages. When I initially designed it I used URL as the primary key. I've learned the error of my ways because left-joining is super slow. So I want to redesign the table with an integer (id) primary key, but still keep the rows unique based on the URL. The problem is that I've found URLs longer than 255 characters, and MySQL isn't letting my create a key on the URL. I'm using an InnoDB/UTF8 table. From what I understand it's using multiple bytes per character with a limit of 766 bytes for the key (in InnoDB). I would really love suggestions on an elegant way of keeping the rows unique based on URL, while using an integer primary key. Thanks!

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• In what package should a "Settings" class be placed?

  - by Tom

  I'm in the middle of building an application but found myself too easily creating new packages without keeping the project's structure in mind. Now, I'm trying to redo the whole project structure on paper first. I am using a Settings class with public properties, accessed as settings for several other classes around the project. Now, since this Settings class applies for the whole project, I am unsure if it should be packaged and if so, in what kind of package should it exist? Or should it be in the root (the default package) with the main application class? I've been thinking about putting it in my utils package, then again I don't think it really is an utlity. Any strategies on how to decide on such package structure for example for a Settings class?

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• mysql codeigniter active record m:m deletion

  - by sea_1987

  Hi There, I have a table 2 tables that have a m:m relationship, what I can wanting is that when I delete a row from one of the tables I want the row in the joining table to be deleted as well, my sql is as follow, Table 1 CREATE TABLE IF NOT EXISTS `job_feed` ( `id` int(11) NOT NULL AUTO_INCREMENT, `body` text NOT NULL, `date_posted` int(10) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ; Table 2 CREATE TABLE IF NOT EXISTS `job_feed_has_employer_details` ( `job_feed_id` int(11) NOT NULL, `employer_details_id` int(11) NOT NULL, PRIMARY KEY (`job_feed_id`,`employer_details_id`), KEY `fk_job_feed_has_employer_details_job_feed1` (`job_feed_id`), KEY `fk_job_feed_has_employer_details_employer_details1` (`employer_details_id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; So what I am wanting to do is, if the a row is deleted from table1 and has an id of 1 I want the row in table to that also has that idea as part of the relationship also. I want to do this in keeping with codeigniters active record class I currently have this, public function deleteJobFeed($feed_id) { $this->db->where('id', $feed_id) ->delete('job_feed'); return $feed_id; }

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• Evenly distribute range of specified values within a vector

  - by nofunsally

  I have a vector A and I want to populate it with values as evenly as possible. For example, if A is 1x30 and I want to use three values I would use a code like this below: % A = zeros(1,30); A([1:10])=0; A([11:20])=1; A([21:30])=2; This works, but seems a bit cumbersome to me. Is there a more elegant way to evenly (as possible) distribute a specified range of values within a vector? I am intent on keeping each of the values in "clumps." Thank you kindly in advance.

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• Drupal 7 - change index.php as a default main page

  - by reycoy

  I'm trying to work on my new website Drupal7 while I'm keeping in the hosting my old static website. So I have: index.html (static website. I want to keep for my users) index.php (drupal new installation) Is there a way to set in drupal this kind of situation? The problem, as you problably can see at this point, is that every time I'm going to a different section I'm being redirected to the .html homepage. I mean for example the admin section is: www.mydomain.com/?q=admin instead of www.mydomain.com/index.php?q=admin What's the easiest way to keep the html static web for my current users while I'm developing my drupal7 website in the "background"?

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• Will Haskell be a good choice for my task?

  - by Narzanka

  I'm starting a new project and don't know which language to use. My 'must have' requirements are: Be able to run on Windows/LinuxMacOs natively (native executable) - user should be able to just run the exe (when on Windows for example) and see the results. No runtimes/interpreters (no jvm, clr, etc) - one file download should be enough to run the application. Full unicode support. Be able to manipulate OS threads (create them, run multiple tasks in parallel on multi-core CPUs, etc). Be reasonably fast (Python level performance and better). To have some kind of standard library that does low-level, mundane tasks. Not very niche and have some community behind it to be able to ask questions. My 'nice to have' requirements are: Language should be functional It should have good string manipulation capabilities (not necessarily regex) Not extremely hard to learn I'm thinking about Haskell now but keeping in mind OCaml as well. Please advice if my choice is correct.

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• How to Handle Console.log and error output in JavaScript.

  - by uber_n00b

  I have a constructor that has a series of classes and functions within it - in each function I check if the param is set to show the error and output if so. Like so using an inline if. The issue and question is short of keeping two versions is this approach not wise in that each IF has to be evaluated thus adding to the time it takes to perform? debugSlide = (bag.debug==1)? console.log("item id =" + bag.itemId) : 0; How do you do this? Any pointers on where I can find tips on this? Thanks in advance!

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• Graphics Question: How do I restrict the mouse cursor to within a circle?

  - by Dan

  I'm playing with XNA. When I click the left mouse button, I record the X,Y co-ordinates. Keeping the mouse button held down, moving the mouse draws a line from this origin to the current mouse position. I've offset this into the middle of the window. Now, what I'd like to do is restrict the mouse cursor to within a circle (with a radius of N, centred on the middle of the screen). Restricting the mouse to a rectangular region is easy enough (by adjusting the origin by the difference of the mouse position and the size of the region), but I haven't a clue on how to start doing it for a circular region. Can anyone explain how to do this? Any advice on where to start would be helpful.

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• C# - Saving a DataGridView to file and loading

  - by Rekar

  Hello, To start off, what I have is a simple Winforms app, with just a save and load button, and with a datagridview control to hold data. What I am looking to do is input some data into the control, hit the save button, and it save all the data to a file locally on the computer, and when I hit load, it loads the file and populates the control appropriately, keeping all rows, columns, and data the same as when saved. Although it sounds fairly simple to me, I cant seem to figure a good way to save and load the data. Can I get a few pointers or examples to get myself started? Thank you.

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