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• Mercurial local repository backup

  - by Ricket

  I'm a big fan of backing things up. I keep my important school essays and such in a folder of my Dropbox. I make sure that all of my photos are duplicated to an external drive. I have a home server where I keep important files mirrored across two drives inside the server (like a software RAID 1). So for my code, I have always used Subversion to back it up. I keep the trunk folder with a stable copy of my application, but then I create a branch named with my username, and inside there is my working copy. I make very few changes between commits to that branch, with the understanding that the code in there is my backup. Now I'm looking into Mercurial, and I must admit I haven't truly used it yet so I may have this all wrong. But it seems to me that you have a server-side repository, and then you clone it to a working directory in the form of a local repository. Then as you work on something, you make commits to that local repository, and when things are in a state to be shared with others, you hg push to the parent repository on the server. Between pushes of stable, tested, bug-free code, where is the backup? After doing some thinking, I've come to the conclusion that it is not meant for backup purposes and it assumes you've handled that on your own. I guess I need to keep my Mercurial local repositories in my dropbox or some other backed-up location, since my in-progress code is not pushed to the server. Is this pretty much it, or have I missed something? If you use Mercurial, how do you backup your local repositories? If you had turned on your computer this morning and your hard drive went up in flames (or, more likely, the read head went bad, or the OS corrupted itself, ...), what would be lost? If you spent the past week developing a module, writing test cases for it, documenting and commenting it, and then a virus wipes your local repository away, isn't that the only copy? So then on the flip side, do you create a remote repository for every local repository and push to it all the time? How do you find a balance? How do you ensure your code is backed up? Where is the line between using Mercurial as backup, and using a local filesystem backup utility to keep your local repositories safe?

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• How to avoid jumping to a solution when under pressure? [closed]

  - by GlenPeterson

  When under a particularly strict programming deadline (like an hour), if I panic at all, my tendency is to jump into coding without a real plan and hope I figure it out as I go along. Given enough time, this can work, but in an interview it's been pretty unsuccessful, if not downright counter-productive. I'm not always comfortable sitting there thinking while the clock ticks away. Is there a checklist or are there techniques to recognize when you understand the problem well enough to start coding? Maybe don't touch the keyboard for the first 5-10 minutes of the problem? At what point do you give up and code a brute-force solution with the hope of reasoning out a better solution later? When is it most productive to think and design more vs. code some experiments to and figure out the design later? Here is a list of techniques for taking a math test and another for taking an oral exam. Is there is a similar list of techniques for handling a programming problem under pressure? ANSWERS: I think this is a valid answer: How To Solve It. I found the link as an answer to Steps to solve or approach towards a solution. There were also some really good tips at Is thinking out loud during an interview really the best strategy?. A great and concise argument for TDD is the first answer to TDD Writing code vs Figuring out the answer to a problem?. My question may be a near-duplicate of that one.

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• How far should one take e-mail address validation?

  - by Mike Tomasello

  I'm wondering how far people should take the validation of e-mail address. My field is primarily web-development, but this applies anywhere. I've seen a few approaches: simply checking if there is an "@" present, which is dead simply but of course not that reliable. a more complex regex test for standard e-mail formats a full regex against RFC 2822 - the problem with this is that often an e-mail address might be valid but it is probably not what the user meant DNS validation SMTP validation As many people might know (but many don't), e-mail addresses can have a lot of strange variation that most people don't usually consider (see RFC 2822 3.4.1), but you have to think about the goals of your validation: are you simply trying to ensure that an e-mail address can be sent to an address, or that it is what the user probably meant to put in (which is unlikely in a lot of the more obscure cases of otherwise 'valid' addresses). An option I've considered is simply giving a warning with a more esoteric address but still allowing the request to go through, but this does add more complexity to a form and most users are likely to be confused. While DNS validation / SMTP validation seem like no-brainers, I foresee problems where the DNS server/SMTP server is temporarily down and a user is unable to register somewhere, or the user's SMTP server doesn't support the required features. How might some experienced developers out here handle this? Are there any other approaches than the ones I've listed? Edit: I completely forgot the most obvious of all, sending a confirmation e-mail! Thanks to answerers for pointing that one out. Yes, this one is pretty foolproof, but it does require extra hassle on the part of everyone involved. The user has to fetch some e-mail, and the developer needs to remember user data before they're even confirmed as valid.

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• Rendering a DOM across multiple displays

  - by meetamit

  I'm building a data-driven animation with HTML and javascript to run in a web browser. I would like to display it tiled across three 1080p monitors. This essentially yields a viewport that's 5760px wide and 1080px tall. Pretty large. Does anyone have experience setting up something like this? I have many questions below, but any tip would be appreciated: Is it reasonable to expect a DOM to render into such a large viewport size at close to 60fps? I might choose to use canvas, instead of SVG or HTML, but that would yield a giant canvas. Can a canvas with such high resolution be performant? Of course everything depends on the complexity of the graphics I want to render, but I'm looking to remove that factor from this question, so assume I'm asking about a canvas animation that can run at 60fps at 1920x1080 resolution. Would it run roughly as fast at 3 times the width? Would three.js and WebGL be a more proper approach at that resolution? How do you actually cause Chrome or FF to span 3 monitors at full screen? Do I need a 3rd party solution of any kind? Thanks!

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• How does the event dispatch thread work?

  - by Roman

  With the help of people on stackoverflow I was able to get the following working code of the simples GUI countdown (it just displays a window counting down seconds). My main problem with this code is the invokeLater stuff. As far as I understand the invokeLater send a task to the event dispatching thread (EDT) and then the EDT execute this task whenever it "can" (whatever it means). Is it right? To my understanding the code works like that: In the main method we use invokeLater to show the window (showGUI method). In other words, the code displaying the window will be executed in the EDT. In the main method we also start the counter and the counter (by construction) is executed in another thread (so it is not in the event dispatching thread). Right? The counter is executed in a separate thread and periodically it calls updateGUI. The updateGUI is supposed to update GUI. And GUI is working in the EDT. So, updateGUI should also be executed in the EDT. It is why the code for the updateGUI is inclosed in the invokeLater. Is it right? What is not clear to me is why we call the counter from the EDT. Anyway it is not executed in the EDT. It starts immediately a new thread and the counter is executed there. So, why we cannot call the counter in the main method after the invokeLater block? import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.SwingUtilities; public class CountdownNew { static JLabel label; // Method which defines the appearance of the window. public static void showGUI() { JFrame frame = new JFrame("Simple Countdown"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); label = new JLabel("Some Text"); frame.add(label); frame.pack(); frame.setVisible(true); } // Define a new thread in which the countdown is counting down. public static Thread counter = new Thread() { public void run() { for (int i=10; i>0; i=i-1) { updateGUI(i,label); try {Thread.sleep(1000);} catch(InterruptedException e) {}; } } }; // A method which updates GUI (sets a new value of JLabel). private static void updateGUI(final int i, final JLabel label) { SwingUtilities.invokeLater( new Runnable() { public void run() { label.setText("You have " + i + " seconds."); } } ); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { showGUI(); counter.start(); } }); } }

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• dynamic module creation

  - by intuited

  I'd like to dynamically create a module from a dictionary, and I'm wondering if adding an element to sys.modules is really the best way to do this. EG context = { a: 1, b: 2 } import types test_context_module = types.ModuleType('TestContext', 'Module created to provide a context for tests') test_context_module.__dict__.update(context) import sys sys.modules['TestContext'] = test_context_module My immediate goal in this regard is to be able to provide a context for timing test execution: import timeit timeit.Timer('a + b', 'from TestContext import *') It seems that there are other ways to do this, since the Timer constructor takes objects as well as strings. I'm still interested in learning how to do this though, since a) it has other potential applications; and b) I'm not sure exactly how to use objects with the Timer constructor; doing so may prove to be less appropriate than this approach in some circumstances. EDITS/REVELATIONS/PHOOEYS/EUREKAE: I've realized that the example code relating to running timing tests won't actually work, because import * only works at the module level, and the context in which that statement is executed is that of a function in the testit module. In other words, the globals dictionary used when executing that code is that of main, since that's where I was when I wrote the code in the interactive shell. So that rationale for figuring this out is a bit botched, but it's still a valid question. I've discovered that the code run in the first set of examples has the undesirable effect that the namespace in which the newly created module's code executes is that of the module in which it was declared, not its own module. This is like way weird, and could lead to all sorts of unexpected rattlesnakeic sketchiness. So I'm pretty sure that this is not how this sort of thing is meant to be done, if it is in fact something that the Guido doth shine upon. The similar-but-subtly-different case of dynamically loading a module from a file that is not in python's include path is quite easily accomplished using imp.load_source('NewModuleName', 'path/to/module/module_to_load.py'). This does load the module into sys.modules. However this doesn't really answer my question, because really, what if you're running python on an embedded platform with no filesystem? I'm battling a considerable case of information overload at the moment, so I could be mistaken, but there doesn't seem to be anything in the imp module that's capable of this. But the question, essentially, at this point is how to set the global (ie module) context for an object. Maybe I should ask that more specifically? And at a larger scope, how to get Python to do this while shoehorning objects into a given module?

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• Microsoft Press Deal of the Day 11/Oct/2012 - CLR via C#, 3rd Edition

  - by TATWORTH

  Today's Deal of the Day from Microsoft Press at http://shop.oreilly.com/product/9780735627048.do?code=MSDEAL is CLR via C#, 3rd EditionThe deal expires probably 23:59 PT, today 11/Oct/2012. Remember to use the code MSDEAL at checkout."Dig deep and master the intricacies of the common language runtime (CLR) and the .NET Framework 4.0. Written by a highly regarded programming expert and consultant to the Microsoft® .NET team, this guide is ideal for developers building any kind of application-including Microsoft® ASP.NET, Windows® Forms, Microsoft® SQL Server®, Web services, and console applications. You'll get hands-on instruction and extensive C# code samples to help you tackle the tough topics and develop high-performance applications." This is a very through book about Dot Net that I have completed reviewing. I commend it to all C# development teams and to individual developers with at least a year's worth of C# experience. The only drawback is that there should be a VB.NET equivalent book for the benefit of the many programming shops that have chosen VB.NET.For further details about the book see: http://oreilly.com/catalog/9780735627048The author has made some useful source available athttp://www.wintellect.com/Resources/Downloads/PushPin

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• SOAP not fetches result in PHP for Mouzenidis travel

  - by ????? ????????????

  I try to get results from http://api.mouzenidis-travel.com/search/ServiceMainSearch.svc?Wsdl There is some methods to fetch data: GetCountries // fetch available country data GetCityDeparture(int countryID) //fetch available departure city data GetFilter(int countryId, List departureCityId) // fetch others filters // My PHP code: $client = new SoapClient("http://api.mouzenidis-travel.com/search/ServiceMainSearch.svc?Wsdl"); $countryList = $client-GetCountries(); // results below [0] => stdClass Object ( [Code] => GR [ID] => 29 [Name] => Греция [NameLat] => Greece ) [1] => stdClass Object ( [Code] => CZ [ID] => 6240 [Name] => Чехия [NameLat] => Czech Republic ) $cityDepObj = $client-GetCityDeparture(array('countryID'=29)); [0] => stdClass Object ( [Code] => MOW [GroupName] => Россия [GroupNameLat] => Россия [GroupOrder] => 4 [ID] => 1 [Name] => Москва [NameLat] => Moscow [CountryID] => 460 [IsDeparture] => 1 [RegionID] => 0 ) [1] => stdClass Object ( [Code] => [GroupName] => Россия [GroupNameLat] => Россия [GroupOrder] => 4 [ID] => 299 [Name] => Архангельск [NameLat] => Arkhangelsk [CountryID] => 460 [IsDeparture] => 1 [RegionID] => 0 ) . . . $client-GetFilter(array(29,array(1))); Fatal error: Uncaught SoapFault exception: [s:Client] No connections available ... I wrote to the Mouzendinis Tech Support, no results. What make I wrong?

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• Directx vs XNA - Which is better for me? [closed]

  - by tristo

  Recently I got Visual Studio 2012 from visual studio 2010, although did not expect Visual Studio to 2012 to designed the way it was. Anyway I am pleased with some of VS 2012 technology and have moved all of my projects to it. At this point of time since I got VS 2012 I have been into making windows applications and other non-game activities. ALTHOUGH have recently gotten into the spirit of game development and I am planning to make a 3d comical game, shader effects, not too complicated meshes, but it requires alot of lighting effects to emphasise certain parts of the game. When I was using VS 2010 I had a great time making 2d games with XNA, it uses a great language, and has a very awesome system. But I no longer have XNA with me, and the workarounds described in stackoverflow always gives me errors while using xna. Anyway it seems that microsoft have stuffed themselves up with xna anyway with the weirdness of Windows 8, and it being only avaliabe on pc and xbox. Due to these reasons I have decided to work with Directx and Direct3d to produce my new game, although the overflowing credits after each directx game gives me the shivers, and the low-level coding of directx also puts me on thin ice with my games, left in a confusional mess with what decision I should make. I don't know anything about directx or direct3d. I am an indie developer, but I am planning to take on alot of professional aspects of games. I don't have heaps of time(2-3 hours a day) I don't mind the complexity of how directx works, as long as I can learn how to make the fundementals of a game in a week. I am also unsure if directx is really for my situation, and keep with xna game development. Anyone can tell me the best technology for me would be great.

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• deallocated memory in tableview: message sent to deallocated instance

  - by Kirn

  I tried looking up other issues but couldn't find anything to match so here goes: I'm trying to display text in the table view so I use this bit of code: // StockData is an object I created and it pulls information from Yahoo APIs based on // a stock ticker stored in NSString *heading NSArray* tickerValues = [heading componentsSeparatedByString:@" "]; StockData *chosenStock = [[StockData alloc] initWithContents:[tickerValues objectAtIndex:0]]; [chosenStock getData]; // Set up the cell... NSDictionary *tempDict = [chosenStock values]; NSArray *tempArr = [tempDict allValues]; cell.textLabel.text = [tempArr objectAtIndex:indexPath.row]; return cell; This is all under cellForRowAtIndexPath When I try to release the chosenStock object though I get this error: [CFDictionary release]: message sent to deallocated instance 0x434d3d0 Ive tried using NSZombieEnabled and Build and Analyze to detect problems but no luck thus far. Ive even gone so far as to comment bits and pieces of the code with NSLog but no luck. I'll post the code for StockData below this. As far as I can figure something is getting deallocated before I do the release but I'm not sure how. The only place I've got release in my code is under dealloc method call. Here's the StockData code: // StockData contains all stock information pulled in through Yahoo! to be displayed @implementation StockData @synthesize ticker, values; - (id) initWithContents: (NSString *)newName { if(self = [super init]){ ticker = newName; } return self; } - (void) getData { NSURL *url = [NSURL URLWithString: [NSString stringWithFormat:@"http://download.finance.yahoo.com/d/quotes.csv?s=%@&f=%@&e=.csv", ticker, @"chgvj1"]]; NSError *error; NSURLResponse *response; NSURLRequest *request = [NSURLRequest requestWithURL:url]; NSData *stockData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error]; if(stockData) { NSString *tempStr = [[NSString alloc] initWithData:stockData encoding:NSASCIIStringEncoding]; NSArray *receivedValuesArr = [tempStr componentsSeparatedByString:@","]; [tempStr release]; values = [NSDictionary dictionaryWithObjects:receivedValuesArr forKeys:[@"change, high, low, volume, market" componentsSeparatedByString:@", "]]; } else { NSLog(@"Connection failed: %@", error); } } - (void)dealloc { [ticker release]; [values release]; [super dealloc]; NSLog(@"Release took place fine"); } @end

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• Does it make sense to write build scripts in C++?

  - by Klaim

  I'm using CMake to generate my projects IDE/makefiles, but I still need to call custom "scripts" to manipulate my compiled files or even generate code. In previous projects I've been using Python and it was OK, but now I'm having serious trouble managing a lot of dependencies in two very big projects I'm working on so I want to minimize the dependencies everywhere. Someone suggested to me to use C++ to write my build scripts instead of adding a language dependency just for that. The projects themeselves already use C++ so there are several advantages that I can see: to build the whole project, only a C++ compiler and CMake would be necessary, nothing else (all the other dependencies are C or C++); C++ type safety (when using modern C++) makes everything easier to get "correct"; it's also the language I know the better so I'm more at ease with it even if I'm able to write some good Python code; potential gain in execution speed (but i don't think it will really be perceptible); However, I think there might be some drawbacks and I'm not sure of the real impact as I didn't try yet: might be longer to write the code (that said I'm not sure because I'm efficient enough in C++ to write something that work quickly, so maybe for this system it wouldn't be so long to write) (compilation time shouldn't be a problem for this case); I must assume that all the text files I'll read as input are in UTF-8, I'm not sure it can be easilly checked at runtime in C++ and the language will not check it for you; libraries in C++ are harder to manage than in scripting languages; I lack experience and forsight so maybe I'm missing advantages and drawbacks. So the question is: does it make sense to use C++ for this? do you have experiences to report and do you see advantages and disadvantages that might be important?

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• sharing life experience

  - by gcc

  I am a student of computer engineering. I have never done any programming before, and as you can understand, I don't know how to study it or how to make my own programs. My English is weak [edited for clarity - ed], and so if you don't like the choices I list, please feel free to provide others. How should I study? How should I learn programming languages? Study completely from a book. Don't study from a book, just try writing code. A mix of the two; study from a book, then try writing code. Study half the book, then write the code by hand on paper. Listed to the teacher, then try to solve general problems (those not from any specific chapter). I have send that question to stackoverflow before when I am at first year. Now, I want to construct webpage to guide fresh students by giving advise of yours and mines.Maybe, you wonder Why I want to construct webpage , I just want help the other student. I am giving a link to that question < http://stackoverflow.com/questions/3389465/how-should-i-study-programming-languagess If you have other advice, feel free. EDIT: This web cite, I think , is constructed to share member's life experience and also I know these experiences is valuable . So I have no right to want your opinion, But I want your opinion / experience even if you think it is not so helpful to other

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• Working with Git on multiple machines

  - by Tesserex

  This may sound a bit strange, but I'm wondering about a good way to work in Git from multiple machines networked together in some way. It looks to me like I have two options, and I can see benefits on both sides: Use git itself for sharing, each machine has its own repo and you have to fetch between them. You can work on either machine even if the other is offline. This by itself is pretty big I think. Use one repo that is shared over the network between machines. No need to do git pulls every time you switch machines, since your code is always up to date. Never worry that you forgot to push code from your other non-hosting machine, which is now out of reach, since you were working off a fileshare on this machine. My intuition says that everyone generally goes with the first option. But the downside I see is that you might not always be able to access code from your other machines, and I certainly don't want to push all my WIP branches to github at the end of every day. I also don't want to have to leave my computers on all the time so I can fetch from them directly. Lastly a minor point is that all the git commands to keep multiple branches up to date can get tedious. Is there a third handle on this situation? Maybe some third party tools are available that help make this process easier? If you deal with this situation regularly, what do you suggest?

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• removing contents of div using Jquery "empty" doesn't work

  - by Andrew

  I'm trying to remove contents of particular div which are basically list items and a heading by using jquery empty so that I could replace with new contents. What happens when I run the code is, the whole div element blinked and flash the replaced content and then the old one reappear. Can anyone tell me what am I doing wrong? Here's an excerpt of my code - <pre> $("#msg_tab").bind("click",function(){ $("#sidebar1").remove(); var html="<ul><li><h2>test</h2><ul><li><a href='#'>Compose New Message</a></li><li><a href='#'>Inbox</a></li><li><a href='#'>Outbox</a></li><li><a href='#'>Unread</a></li><li><a href='#'>Archive</a></li></ul></li></ul>"; $("#sidebar1").append(html); }); <div id="sidebar1" class="sidebar"> <ul> <li> <h2>Messages</h2> <ul> <li><a href="#">Compose New Message</a></li> <li><a href="#">Inbox</a></li> <li><a href="#">Outbox</a></li> <li><a href="#">Unread</a></li> <li><a href="#">Archive</a></li> </ul> </li> </ul> </div> Another question is, how do I write multiple line html code string in javascript so that java would recognize as a string value? Placing forward slash at the end is ok when the string is not a html code but, in html code, I can't figure out how to escape forward slash from ending tags.I've tried escaping it with backward slash but doesn't work. I would be appreciated if anyone could shed a light on this matter as well.

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• grdb not working variables

  - by stupid_idiot

  hi, i know this is kinda retarded but I just can't figure it out. I'm debugging this: xor eax,eax mov ah,[var1] mov al,[var2] call addition stop: jmp stop var1: db 5 var2: db 6 addition: add ah,al ret the numbers that I find on addresses var1 and var2 are 0x0E and 0x07. I know it's not segmented, but that ain't reason for it to do such escapades, because the addition call works just fine. Could you please explain to me where is my mistake? I see the problem, dunno how to fix it yet though. The thing is, for some reason the instruction pointer starts at 0x100 and all the segment registers at 0x1628. To address the instruction the used combination is i guess [cs:ip] (one of the segment registers and the instruction pointer for sure). The offset to var1 is 0x10 (probably because from the begining of the code it's the 0x10th byte in order), i tried to examine the memory and what i got was: 1628:100 8 bytes 1628:108 8 bytes 1628:110 <- wtf? (assume another 8 bytes) 1628:118 ... whatever tricks are there in the memory [cs:var1] points somewhere else than in my code, which is probably where the label .data would usually address ds.... probably.. i don't know what is supposed to be at 1628:10 ok, i found out what caused the assness and wasted me whole fuckin day. the behaviour described above is just correct, the code is fully functional. what i didn't know is that grdb debugger for some reason sets the begining address to 0x100... the sollution is to insert the directive ORG 0x100 on the first line and that's the whole thing. the code was working because instruction pointer has the right address to first instruction and goes one by one, but your assembler doesn't know what effective address will be your program stored at so it pretty much remains relative to first line of the code which means all the variables (if not using label for data section) will remain pointing as if it started at 0x0. which of course wouldn't work with DOS. and grdb apparently emulates some DOS features... sry for the language, thx everyone for effort, hope this will spare someone's time if having the same problem... heheh.. at least now i know the reason why to use .data section :))))

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• Is C# development effectively inseparable from the IDE you use?

  - by Ghopper21

  I'm a Python programmer learning C# who is trying to stop worrying and just love C# for what it is, rather than constantly comparing it back to Python. I'm really get caught up on one point: the lack of explicitness about where things are defined, as detailed in this Stack Overflow question. In short: in C#, using foo doesn't tell you what names from foo are being made available, which is analogous to from foo import * in Python -- a form that is discouraged within Python coding culture for being implicit rather than the more explicit approach of from foo import bar. I was rather struck by the Stack Overflow answers to this point from C# programmers, which was that in practice this lack of explicitness doesn't really matter because in your IDE (presumably Visual Studio) you can just hover over a name and be told by the system where the name is coming from. E.g.: Now, in theory I realise this means when you're looking with a text editor, you can't tell where the types come from in C#... but in practice, I don't find that to be a problem. How often are you actually looking at code and can't use Visual Studio? This is revelatory to me. Many Python programmers prefer a text editor approach to coding, using something like Sublime Text 2 or vim, where it's all about the code, plus command line tools and direct access and manipulation of folders and files. The idea of being dependent on an IDE to understand code at such a basic level seems anathema. It seems C# culture is radically different on this point. And I wonder if I just need to accept and embrace that as part of my learning of C#. Which leads me to my question here: is C# development effectively inseparable from the IDE you use?

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• SOA: Simplifying Cloud, Mobile, and On-premise Integration–Webcast October 24th 2013

  - by JuergenKress

  Proliferation of mobile devices, data explosion, and cloud enablement has caused a dramatic shift in IT. Organizations need to rethink their application infrastructures to accommodate increased processing speeds, heightened security and availability concerns for their applications, all while meeting lowered total cost of ownership. Traditional infrastructures may not be sufficient to accommodate the diversity and complexity of integrations in this new era. Many of today’s IT organizations rely on a Service Oriented Architecture (SOA) backbone to keep their businesses running. SOA adoption and acceptance across industries have led to platform maturity at the application layer level. However, we are at the start of an era where there is a new modus operandi for organizations to thrive and deliver continuously on competitive differentiation. This change is a result of market globalization, explosion in the number of mobile devices, unparalleled growth in voluminous data and innovation that crosses organizational boundaries. Social, mobile, cloud are terms that are revolutionizing the way organizations operate. Oracle SOA Suite is a hot-pluggable software suite to build, deploy and manage Service-Oriented Architectures (SOA).Oracle SOA transforms complex application integration into agile and reusable service-based connectivity by mediating, routing, and managing interactions between services and applications in the enterprise and in the cloud. Oracle SOA Suite's hot-pluggable architecture helps businesses lower upfront costs by allowing maximum re-use of existing IT investments and assets. Join us on this webcast to find out how you can optimize the use of Oracle SOA Suite, simplifying integration, and what does the next generation of SOA has to offer to you. Agenda: What's new in Oracle SOA Simplifying integration Application Integration and SOA Cloud integration with SOA Mobile Integration leveraging Oracle SOA Suite Oracle Delivers on Next Generation SOA Customer Examples Summary and Q&A Webcast Thursday October 24th, 2013 10am CET (8am UTC / 11am EEST)Details at the Registration Page SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Facebook Wiki Mix Forum Technorati Tags: cloud integration,mobile integration,training,webcast middeware,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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• Reflection velocity

  - by MindSeeker

  I'm trying to get a moving circular object to bounce (elastically) off of an immovable circular object. Am I doing this right? (The results look right, but I hate to trust that alone, and I can't find a tutorial that tackles this problem and includes the nitty gritty math/code to verify what I'm doing). If it is right, is there a better/faster/more elegant way to do this? Note that the object (this) is the moving circle, and the EntPointer object is the immovable circle. //take vector separating the two centers <x, y>, and then get unit vector of the result: MathVector2d unitnormal = MathVector2d(this -> Retxpos() - EntPointer -> Retxpos(), this -> Retypos() - EntPointer -> Retypos()).UnitVector(); //take tangent <-y, x> of the unitnormal: MathVector2d unittangent = MathVector2d(-unitnormal.ycomp, unitnormal.xcomp); MathVector2d V1 = MathVector2d(this -> Retxvel(), this -> Retyvel()); //Calculate the normal and tangent vector lengths of the velocity: (the normal changes, the tangent stays the same) double LengthNormal = DotProduct(unitnormal, V1); double LengthTangent = DotProduct(unittangent, V1); MathVector2d VelVecNewNormal = unitnormal.ScalarMultiplication(-LengthNormal); //the negative of what it was before MathVector2d VelVecNewTangent = unittangent.ScalarMultiplication(LengthTangent); //this stays the same MathVector2d NewVel = VectorAddition(VelVecNewNormal, VelVecNewTangent); //combine them xvel = NewVel.xcomp; //and then apply them yvel = NewVel.ycomp; Note also that this question is just about velocity, the position code is handled elsewhere (in other words, assume that this code is implemented at the exact moment that the circles begin to overlap). Thanks in advance for your help and time!

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• Pair Programming, for or against? [on hold]

  - by user1037729

  I believe it has many advantages over individual programming: Pros By pairing senior with relatively junior staff, the more junior can get up to speed with both project and computing experience, and the senior will re-think the problem in order to communicate with the junior, thus re-checking his own thinking (rubber duck principle!). At least 2 people will know about any single piece of work, if one person is away the other can cover, or if some one leaves a project knowledge transfer is easier. Two brains on a complex task is more effective, communication keeps the work free flowing and provides redundancy in decision making. Code is effectively reviewed as its being written, no need for a separate reviewing phase which requires a context switch as someone who has not been working on the piece in question would be required to understand and review the related code. Reviewing code on your own which you haven't written or architected is not fun, hence counter productive. Cons Less bandwith for performing tasks, lets say we have 4 devs, pair programming requires 2 devs per task, so we would be doing 2 tasks concurrently as a posed to 4. I believe this "Con" does not stand up as the pair programmed task would complete sooner and comes with a review built in for free! Ie the pair programming task would be more efficient and thus free up resources earlier. Less flexibility to chop and change tasks as two developers are tied into a task, when flexibility is required this could be a problem.

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• Structuring Access Control In Hierarchical Object Graph

  - by SB2055

  I have a Folder entity that can be Moderated by users. Folders can contain other folders. So I may have a structure like this: Folder 1 Folder 2 Folder 3 Folder 4 I have to decide how to implement Moderation for this entity. I've come up with two options: Option 1 When the user is given moderation privileges to Folder 1, define a moderator relationship between Folder 1 and User 1. No other relationships are added to the db. To determine if the user can moderate Folder 3, I check and see if User 1 is the moderator of any parent folders. This seems to alleviate some of the complexity of handling updates / moved entities / additions under Folder 1 after the relationship has been defined, and reverting the relationship means I only have to deal with one entity. Option 2 When the user is given moderation privileges to Folder 1, define a new relationship between User 1 and Folder 1, and all child entities down to the grandest of grandchildren when the relationship is created, and if it's ever removed, iterate back down the graph to remove the relationship. If I add something under Folder 2 after this relationship has been made, I just copy all Moderators into the new Entity. But when I need to show only the top-level Folders that a user is Moderating, I need to query all folders that have a parent folder that the user does not moderate, as opposed to option 1, where I just query any items that the user is moderating. Thoughts I think it comes down to determining if users will be querying for all parent items more than they'll be querying child items... if so, then option 1 seems better. But I'm not sure. Is either approach better than the other? Why? Or is there another approach that's better than both? I'm using Entity Framework in case it matters.

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• Seperation of drawing and logic in games

  - by BFree

  I'm a developer that's just now starting to mess around with game development. I'm a .Net guy, so I've messed with XNA and am now playing around with Cocos2d for the iPhone. My question really is more general though. Let's say I'm building a simple Pong game. I'd have a Ball class and a Paddle class. Coming from the business world development, my first instinct is to not have any drawing or input handling code in either of these classes. //pseudo code class Ball { Vector2D position; Vector2D velocity; Color color; void Move(){} } Nothing in the ball class handles input, or deals with drawing. I'd then have another class, my Game class, or my Scene.m (in Cocos2D) which would new up the Ball, and during the game loop, it would manipulate the ball as needed. The thing is though, in many tutorials for both XNA and Cocos2D, I see a pattern like this: //pseudo code class Ball : SomeUpdatableComponent { Vector2D position; Vector2D velocity; Color color; void Update(){} void Draw(){} void HandleInput(){} } My question is, is this right? Is this the pattern that people use in game development? It somehow goes against everything I'm used to, to have my Ball class do everything. Furthermore, in this second example, where my Ball knows how to move around, how would I handle collision detection with the Paddle? Would the Ball need to have knowledge of the Paddle? In my first example, the Game class would have references to both the Ball and the Paddle, and then ship both of those off to some CollisionDetection manager or something, but how do I deal with the complexity of various components, if each individual component does everything themselves? (I hope I'm making sense.....)

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• Google Currency Convertor JSON API

  - by Gopinath

  There are many live currency conversion services available on the web and the popular one’s among them are – Google, Yahoo, MSN & XE. Among all these four Google is the developer’s darling and it provides a simple JSON API that can be integrated in your applications.  http://www.google.com/ig/calculator?hl=en&q=1USD=?INR Using the API is very simple and it takes two parameters as input. The first parameter “hl” is the language code in which you want output. The second parameter “q” is the conversion query in the format <number><from currency code>=?<to currency code>. In the URL give above the query requests for conversion of 1 USD in INR. JSON output for the above query would be  similar to {lhs: "1 U.S. dollar",rhs: "54.4602984 Indian rupees",error: "",icc: true} Examples: 100 USD in INR  http://www.google.com/ig/calculator?hl=en&q=100USD=?INR Example 2: 1 GBP in INR http://www.google.com/ig/calculator?hl=en&q=1GBP=?INR Example 3: 1 USD in INR, output the data in French language http://www.google.com/ig/calculator?hl=fr&q=1USD=?INR   This is an undocumented service and expect changes at any time. But as long as it works, you got a programmatic way to convert currencies.

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• Good practices when optimizing HTML5/Javascript Game Developement [closed]

  - by hustlerinc

  I'm just starting out as a game developer and have created a few crappy but playable clones of classic games like pong, and bomberman. Being self taught (bless the internet) I do this by just stuffing in code to make the games work. Now I feel the time has come to create something complete, for this I need to know how a game is structured. I've searched on the web but there isn't that much to be found. The only "high-level" language I know is javascript so reading a tutorial or article based on C++ doesn't help me that much. I'm looking for good resource's pedagogically covering the theory and possibly examples (in Javascript or pseudo code that is understandable for a beginner) of how the game pieces fit together. From the start screen to asset loading and running the game loop. I'm not looking for anything complicated like reading through a 4000 line source code. All I want to learn is where, how and when the main parts of every game should be called. If you know any good resources to share, or maybe even have an answer for me I would deeply appreciate it.

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• Php plugin to replace '->' with '.' as the member access operator ? Or even better: alternative synt

  - by Gigi

  Present day usable solution: Note that if you use an ide or an advanced editor, you could make a code template, or record a macro that inserts '->' when you press Ctrl and '.' or something. Netbeans has macros, and I have recorded a macro for this, and I like it a lot :) (just click the red circle toolbar button (start record macro),then type -> into the editor (thats all the macro will do, insert the arrow into the editor), then click the gray square (stop record macro) and assign the 'Ctrl dot' shortcut to it, or whatever shortcut you like) The php plugin: The php plugin, would also have to have a different string concatenation operator than the dot. Maybe a double dot ? Yea... why not. All it has to do is set an activation tag so that it doesnt replace / interpreter '.' as '->' for old scripts and scripts that dont intent do use this. Something like this: <php+ $obj.i = 5 ?> (notice the modified '<?php' tag to '<?php+' ) This way it wouldnt break old code. (and you can just add the '<?php+' code template to your editor and then type 'php tab' (for netbeans) and it would insert '<?php+' ) With the alternative syntax method you could even have old and new syntax cohabitating on the same page like this (I am illustrating this to show the great compatibility of this method, not because you would want to do this): <?php+ $obj.i = 5; ?> <?php $obj->str = 'a' . 'b'; ?> You could change the tag to something more explanatory, in case somebody who doesnt know about the plugin reads the script and thinks its a syntax error <?php-dot.com $obj.i = 5; ?> This is easy because most editors have code templates, so its easy to assign a shortcut to it. And whoever doesnt want the dot replacement, doesnt have to use it. These are NOT ultimate solutions, they are ONLY examples to show that solutions exist, and that arguments against replacing '->' with '.' are only excuses. (Just admit you like the arrow, its ok : ) With this potential method, nobody who doesnt want to use it would have to use it, and it wouldnt break old code. And if other problems (ahem... excuses) arise, they could be fixed too. So who can, and who will do such a thing ?

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• Dependency Inversion Principle

  - by Chris Paine

  I have been studying also S.O.L.I.D. and watched this video: https://www.youtube.com/watch?v=huEEkx5P5Hs 01:45:30 into the video he talks about the Dependency Inversion Principle and I am scratching my head??? I had to simplify it(if possible) to get it through this thick scull of mine and here is what I came up with. Code on the marked My_modified_code my version, code marked Original DIP video version. Can I accomplish the same with the latter code? Thanks in advance. Original: namespace simple.main { class main { static void Main() { FirstClass FirstClass = new FirstClass(new OtherClass()); FirstClass.Method(); Console.ReadKey(); //tempClass temp = new OtherClass(); //temp.Method(); } } public class FirstClass { private tempClass _LastClass; public FirstClass(tempClass tempClass)//ctor { _LastClass = tempClass; } public void Method() { _LastClass.Method(); } } public abstract class tempClass{public abstract void Method();} public class LASTCLASS : tempClass { public override void Method() { Console.WriteLine("\nHello World!"); } } public class OtherClass : tempClass { public override void Method() { Console.WriteLine("\nOther World!"); } } } My_modified_code: namespace simple.main { class main { static void Main() { //FirstClass FirstClass = new FirstClass(new OtherClass()); //FirstClass.Method(); //Console.ReadKey(); tempClass temp = new OtherClass(); temp.Method(); } } //public class FirstClass //{ // private tempClass _LastClass; // public FirstClass(tempClass tempClass)//ctor // { // _LastClass = tempClass; // } // public void Method() // { // _LastClass.Method(); // } //} public abstract class tempClass{public abstract void Method();} public class LASTCLASS : tempClass { public override void Method() { Console.WriteLine("\nHello World!"); } } public class OtherClass : tempClass { public override void Method() { Console.WriteLine("\nOther World!"); } }

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