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• Writing use cases for XML mapping scenarios between two different systems

  - by deepak_prn

  I am having some trouble writing use cases for XML mapping after a certain trigger invoked by the system. For example, one of the scenarios goes: the store cashier sells an item, the transaction data is sent to Data management system. Now, I am writing a functional design for the scenario which deals with mapping XML fields between our system and the data management system. Question : I was wondering if some one had to deal with writing use cases or extension use cases for mapping XML fields between two systems? (There is no XSLT involved) and if you used a table to represent the fields mapping (example is below) or any other visualization tool which does not break the bank ? I searched many questions on SO and here but nothing came close to my requirement.

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• How can an SQL relational database be used to model a thesaurus? [closed]

  - by Miles O'Keefe

  I would like to design a web app that functions as a simple thesaurus: a long list of words with attributes, all of which are linked to each other. This thesaurus data model can be defined as: a controlled vocabulary arranged in a known order in which equivalence, hierarchical, and associative relationships among terms are clearly displayed and identified by standardized relationship indicators. My idea so far is to have one database in which every word is a table, and every table contains all words related to that word. e.g. Thesaurus(database) - happy(table) - excited(row)|cheerful(row)|lively(row) Is there are more efficient way to store words and their relationship to other words in a relational SQL database?

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• Declarative Architectures in Infrastructure as a Service (IaaS)

  - by BuckWoody

  I deal with computing architectures by first laying out requirements, and then laying in any constraints for it's success. Only then do I bring in computing elements to apply to the system. As an example, a requirement might be "world-side availability" and a constraint might be "with less than 80ms response time and full HA" or something similar. Then I can choose from the best fit of technologies which range from full-up on-premises computing to IaaS, PaaS or SaaS. I also deal in abstraction layers - on-premises systems are fully under your control, in IaaS the hardware is abstracted (but not the OS, scale, runtimes and so on), in PaaS the hardware and the OS is abstracted and you focus on code and data only, and in SaaS everything is abstracted - you merely purchase the function you want (like an e-mail server or some such) and simply use it. When you think about solutions this way, the architecture moves to the primary factor in your decision. It's problem-first architecting, and then laying in whatever technology or vendor best fixes the problem. To that end, most architects design a solution using a graphical tool (I use Visio) and then creating documents that  let the rest of the team (and business) know what is required. It's the template, or recipe, for the solution. This is extremely easy to do for SaaS - you merely point out what the needs are, research the vendor and present the findings (and bill) to the business. IT might not even be involved there. In PaaS it's not much more complicated - you use the same Application Lifecycle Management and design tools you always have for code, such as Visual Studio or some other process and toolset, and you can "stamp out" the application in multiple locations, update it and so on. IaaS is another story. Here you have multiple machines, operating systems, patches, virus scanning, run-times, scale-patterns and tools and much more that you have to deal with, since essentially it's just an in-house system being hosted by someone else. You can certainly automate builds of servers - we do this as technical professionals every day. From Windows to Linux, it's simple enough to create a "build script" that makes a system just like the one we made yesterday. What is more problematic is being able to tie those systems together in a coherent way (as a solution) and then stamp that out repeatedly, especially when you might want to deploy that solution on-premises, or in one cloud vendor or another. Lately I've been working with a company called RightScale that does exactly this. I'll point you to their site for more info, but the general idea is that you document out your intent for a set of servers, and it will deploy them to on-premises clouds, Windows Azure, and other cloud providers all from the same script. In other words, it doesn't contain the images or anything like that - it contains the scripts to build them on-premises or on a cloud vendor like Microsoft. Using a tool like this, you combine the steps of designing a system (all the way down to passwords and accounts if you wish) and then the document drives the distribution and implementation of that intent. As time goes on and more and more companies implement solutions on various providers (perhaps for HA and DR) then this becomes a compelling investigation. The RightScale information is here, if you want to investigate it further. Yes, there are other methods I've found, but most are tied to a single kind of cloud, and I'm not into vendor lock-in. Poppa Bear Level - Hands-on EvaluateRightScale at no cost.  Just bring your Windows Azurecredentials and follow the these tutorials: Sign Up for Windows Azure Add     Windows Azure to a RightScale Account Windows Azure Virtual Machines     3-tier Deployment Momma Bear Level - Just the Right level... ;0)  WindowsAzure Evaluation Guide - if you are new toWindows Azure Virtual Machines and new to RightScale, we recommend that youread the entire evaluation guide to gain a more complete understanding of theWindows Azure + RightScale solution.    WindowsAzure Support Page @ support.rightscale.com - FAQ's, tutorials,etc. for  Windows Azure Virtual Machines (Work in Progress) Baby Bear Level - Marketing WindowsAzure Page @ www.rightscale.com - find overview informationincluding solution briefs and presentation & demonstration videos   Scale     and Automate Applications on Windows Azure  Solution Brief     - how RightScale makes Windows Azure Virtual Machine even better SQL     Server on Windows Azure  Solution Brief   -       Run Highly Available SQL Server on Windows Azure Virtual Machines

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• What is involved for a simple UDP game?

  - by acidzombie24

  I once tried to write a simple game with UDP in a week as a throwaway test. It went horribly. I threw it away early. The main problem i had was restoring the game state of all players/enemies/objects to an old state and fast forward the game to the point of time the player is playing (ie half a second before a jump. A little early or late can make the player miss the jump) Maybe this method is not the easiest way? i suspect it to be but i designed it wrong from the beginning and realized at the end of 2nd day. (so i didnt learn too much or wasted that much time) For myself and others, What is involved for a simple UDP game and how do i write one? Or how do i solve the prediction problem restoring to state properly. I'll mark this as CW bc i know there will be lots of helpful answers.

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• How do I make sure the web developer I hire will not steal my idea?

  - by Greg McNulty

  So I have a great idea for a new website. However, not the time to develop it. I would like to hire a person or company to design it for me. What steps do I need to take, to protect my idea? Where and how do people protect website ideas in general? Also, how easy is it for someone to tweak the idea and make it legally heir own? Is a patent enough to protect such a thing, idea. Are there different levels or types of protection? Thank You.

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• complex access control system

  - by Atul Gupta

  I want to build a complex access control system just like Facebook. How should I design my database so that: A user may select which streams to see (via liking a page) and may further select to see all or only important streams. Also he get to see posts of a friend, but if a friend changes visibility he may or may not see it. A user may be an owner or member of a group and accordingly he have access. So for a user there is so many access related information and also for each data point. I use Perl/MySQL/Apache. Any help will be appreciated.

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• What is the best way to bypass China firewall to allow SSH deploy@**.com

  - by Lap

  I am trying to bypass the china firewall and allow SSH deploy@**.com at the command console. This is because I need to test the games I wrote on apps.facebook.com/**. I tried VPN (both pptp and openvpn), but they aren't that great as connection speed slows down significantly. Since I am deploying the game in another site, my browser needs to download the game, which is super slow. What are ways of bypassing the firewall other than getting a VPN? I was thinking maybe have a computer outside China and using teamviewer to access...

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• Taking Object Oriented development to the next level

  - by Songo

  Can you mention some advanced OO topics or concepts that one should be aware of? I have been a developer for 2 years now and currently aiming for a certain company that requires a web developer with a minimum experience of 3 years. I imagine the interview will have the basic object oriented topics like (Abstraction, Polymorphism, Inheritance, Design patterns, UML, Databases and ORMs, SOLID principles, DRY principle, ...etc) I have these topics covered, but what I'm looking forward to is bringing up topics such as Efferent Coupling, Afferent Coupling, Instability, The law of Demeter, ...etc. Till few days ago I never knew such concepts existed (maybe because I'm a communication engineer basically not a CS graduate.) Can you please recommend some more advanced topics concerning object oriented programming?

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• Effective template system

  - by Alex

  I'm building a content management system, and need advice on which theming structure should I adopt. A few options (This is not a complete list): Wordpress style: the controller decides what template to load based on the user request, like: home page / article archive / single article page etc. each of these templates are unrelated to other templates, and must exist within the theme the theme developer decides if (s)he want to use inner-templates (like "sidebar", "sidebar item"), and includes them manually where (s)he thinks are needed. Drupal style: the controller gives control to the theme developer only to inner-templates; if they don't exist it falls back internally to some default templates (I find this very restrictive) Funky style: the controller only loads a "index.php" template and provides the theme developer conditional tags, which he can use to include inner-templates if (s)he wants. Among these styles, or others what style of template system allows for fast development and a more concise design and implementation.

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• Books, resources and so on about GUI architecture [on hold]

  - by Moses

  I'm making first steps in GUI programming. Earlier I've had little experience with GUI and I remember that it was kind of pain. Code was either coupled or to verbose with tons of "Listeners". It seems to me that problem in me and not in a library that I used(Swing). So, could you recommend me some books, tutorials or resources where I can find how to design gui programms? Emphasize that I'm interested in architecture and not in how to use components of some framework(which about 90% of tutorials that I've ever seen).

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• How do you end up with event-sourcing if you use a xDD approach?

  - by Tomas Jansson

  When working in a TDD or BDD manner your unit tests are supposed to drive your design. But how do you end up with event-sourcing using a xDD techniques? As I see it event sourcing is something you need to adopt early on to take full advantage of it. Lets say that you start without event-sourcing and do a release. Later on when you are releasing version 2.0 you realize that it would be great to use event-sourcing, but at that point you alread have missed all the events from version 1.0 so it makes it much harder to implement. Or do you take some kind of backup of your db from before event-sourcing and use that as base line and then add event-sourcing on top of that?

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• How to diagnose network speed drops

  - by Luis Alvarado

  Here is the image of System Monitor first: The graph shows the cycle the connection goes through. After 10 to 15 seconds it drops to 0 KB/S, then goes up to the Max speed (120 KB/S) then it repeats. dmesg shows the following during that time: [ 6066.757211] wlan0: send auth to 00:26:5a:b5:05:7b (try 1/3) [ 6066.804405] wlan0: authenticated [ 6066.804578] rt2800pci 0000:02:01.0 wlan0: disabling HT/VHT due to WEP/TKIP use [ 6066.805016] wlan0: associate with 00:26:5a:b5:05:7b (try 1/3) [ 6066.809218] wlan0: RX AssocResp from 00:26:5a:b5:05:7b (capab=0x431 status=0 aid=1) [ 6066.809581] wlan0: associated [ 6066.810203] bridge-eth0: disabling the bridge on dev down [ 6066.810239] bridge-eth0: down [ 6066.810254] bridge-eth0: detached [ 6066.810309] /dev/vmnet: open called by PID 1679 (vmnet-bridge) [ 6066.810322] /dev/vmnet: hub 0 does not exist, allocating memory. [ 6066.810355] /dev/vmnet: port on hub 0 successfully opened [ 6066.810366] bridge-wlan0: device is wireless, enabling SMAC [ 6066.810369] bridge-wlan0: up [ 6066.810372] bridge-wlan0: attached [ 6067.010285] userif-2: sent link down event. [ 6067.010290] userif-2: sent link up event. This also repeats with Wired or Wireless connections. How can I diagnose this changes in the network efficiently.

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• Trying to develop a game with android for cracking glasses in different dimensions

  - by user46514

  I am trying to develop a game in android where I will have to punch a hole to get through the glass but not shatter the glass completely. The glass will show up in different forms of polygons and when a hole is created by a projectile, the rest of the polygon will still remain intact.Only a polygonal opening will get created at the point of impact with the projectile. I am new at game design in android but I was thinking that I would create a random polygon shape to show in the path and then at the point where the projectile hits it, I could create a glass polygon to create a splinter effect. The rest of the part of the glass that is randomly created at the point of impact, I could further splinter it into polygons flying at different angle. since I also need to capture the bits of glasses flying off and falling down with gravity. Is my solution the best efficient one at performance of threads or is there a better solution for this glass breaking effect. Thanks Dhiren

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• How do I restore a backup of my keyring (containing ssh key passprases, nautilus remote filesystem passwords and wifi passwords)?

  - by con-f-use

  I changed the disk on my laptop and installed Ubuntu on the new disk. Old disk had 12.04 upgraded to 12.10 on it. Now I want to copy my old keyring with WiFi passwords, ftp passwords for nautilus and ssh key passphrases. I have the whole data from the old disk available (is now a USB disk and I did not delete the old data yet or do anything with it - I could still put it in the laptop and boot from it like nothing happend). The old methods of just copying ~/.gconf/... and ~/.gnome2/keyrings won't work. Did I miss something? 1. Edit: I figure one needs to copy files not located in the users home directory as well. I copied the whole old /home/confus (which is my home directory) to the fresh install to no effect. That whole copy is now reverted to the fresh install's home directory, so my /home/confus is as it was the after fresh install. 2. Edit: The folder /etc/NetworkManager/system-connections seems to be the place for WiFi passwords. Could be that /usr/share/keyrings is important as well for ssh keys - that's the only sensible thing that a search came up with: find /usr/ -name "*keyring* 3. Edit: Still no ssh and ftp passwords from the keyring. What I did: Convert old hard drive to usb drive Put new drive in the laptop and installed fresh version of 12.10 there Booted from old hdd via USB and copied its /etc/NetwrokManager/system-connections, ~/.gconf/ and ~/.gnome2/keyrings, ~/.ssh over to the new disk. Confirmed that all keys on the old install work Booted from new disk Result: No passphrase for ssh keys, no ftp passwords in keyring. At least the WiFi passwords are migrated.

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• Why USA produces the best / most popular software? [closed]

  - by user1598390

  Have you noticed that a disproportionate amount of popular software products comes from the USA ? Examples: iOS, OS X, Phosothop, Oracle, Windows, Final Cut Pro, MS Office, iTunes, iWorks Suite, iLife Suite, AutoCad, Aperture, Google search engine, Twitter and endless stream of software that are the best in their fields and that are the models the rest of the industry want to emulate. Few people would deny that the most popular software comes from American companies. Obviously there's plenty of good software coming from outside the US, like Linux or SAP but most great looking, killer software comes from USA. Maybe these companies outsource the code elsewhere but the inception and design is mostly done in the USA. Why is that? and, can it be replicated elsewhere given the correct "ingredients" ?

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• Programming language features that help to catch bugs early

  - by Christian Neumanns

  Do you know any programming language features that help to detect bugs early in the software development process - ideally at compile-time or else as early as possible at run-time? Examples of well-known and effective bug-reducing features are: Static typing and generic types: type incompatibility errors are detected by the compiler Design by Contract (TM), also called Contract Programming: invalid values are quickly detected at runtime (through preconditions, postconditions and class invariants) Unit testing I ask this question in the context of improving an object-oriented programming language (called Obix) which has been designed from the ground up to 'make it easy to quickly write reliable code'. Besides the features mentioned above this language also incorporates other Fail-fast features such as: Objects are immutable by default Void (null) values are not allowed by default The aim is to add more Fail-fast concepts to the language. If you know other features which help to write less error-prone code then please let us know. Thank you.

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• OOD: All classes at bottom of hierarchy contain the same field

  - by My Head Hurts

  I am creating a class diagram for what I thought was a fairly simple problem. However, when I get to the bottom of the hierarchy, all of the classes only contain one field and it is the same one. This to me looks very wrong, but this field does not belong in any of the parent classes. I was wondering if there are any suggested design patterns in a situation like this? A simplified version of the class diagram can be found below. Note, fields named differently cannot belong to any other class +------------------+ | ObjectA | |------------------| | String one | | String two | | | +---------+--------+ | +---------------+----------------+ | | +--------|--------+ +--------|--------+ | ObjectAA | | ObjectAB | |-----------------| |-----------------| | String three | | String four | | | | | +--------+--------+ +--------+--------+ | | | | +--------|--------+ +--------|--------+ | ObjectAAA | | ObjectABA | |-----------------| |-----------------| | String five | | String five | | | | | +-----------------+ +-----------------+ ASCII tables drawn using http://www.asciiflow.com/

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• Which are the cons of using only non-member functions and POD?

  - by Miro

  I'm creating my own game engine. I've read these articles and this question about DOD and it was written to not use member functions and classes. I also heard some criticism to this idea. I can write it using member functions or non-member functions it would be similar. So what are the benefits/cons of that approach or when the project grows, does any of these approaches give clearer and better manageable code? With POD & non-member functions I don't have to make struct members public I can still use object id outside of engine like OpenGL does with all it's stuff, so It's not about encapsulation. POD - plain old data DOD - data oriented design

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• Oracle WebLogic Server - Technologietage

  - by franziska.schneider(at)oracle.com

  Dieser Technologietag richtet sich insbesondere an Interessierte, die den Oracle WebLogic Server bereits im Einsatz haben und sich einen umfassenden technischen Überblick verschaffen wollen bzw. sich für die Neuerungen des aktuellen Releases interessieren. Folgende Themen werden im Rahmen des WLS Technologietages betrachtet: Design und Architektur - Entwicklung - Diagnose und Optimierung - Administration und Betrieb - Virtualisierung und Cloud Stuttgart am 29. März 2011München am 30. März 2011Frankfurt am 31.März 2011Düsseldorf am 6. April 2011Hamburg am 12. April 2011Potsdam am 13.April 2011 Der Teilnehmerkreis ist auf 25 Personen begrenzt. Bitte melden Sie sich bei uns und wir senden Ihnen das Anmeldeformular umgehend zu.

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• Fair dice over network w/o trusted 3rd party

  - by Kay

  Though it should be a pretty basic problem, I did not find a solution for it: How to play dice over a network without a trusted third party? The M players shall roll N dice, one player after another. No player may "cheat", i.e. change the outcome to his advantage, or "look into the future" before the next roll. Is that possible? I guess the solution would be something like public key crypto, where each player turns in an encrypted message. After all messages were collected you exchange the keys to decode the messages. Then the sha1(joined string of all decrypted messages) mod 6 + 1 is used to determine the die. The major problem I have: since the message [c/s]hould be anything, I don't know how to prevent tampering with the private keys. Esp. the last player to turn in his key could easily cheat (I guess). The game should even stay fair, if all players "conspire" against one player.

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• How to play many sounds at once in OpenAL

  - by Krom

  Hello, I'm developing an RTS game and I would like to add sounds to it. My choice has landed on OpenAL. I have plenty of units which from time to time make sounds: fSound.Play(sfx_shoot, location). Sounds often repeat, e.g. when squad of archers shoots arrows, but they are not synced with each other. My questions are: What is the common design pattern to play multiple sounds in OpenAL, when some of them are duplicate? What are the hardware limitations on sounds count and tricks to overcome them?

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• Duplicity can't connect to CloudFiles "Network is unreachable"

  - by jwandborg

  Whenever I click "Backup now" in the Backup GUI, the smaller "Back Up" window opends, and after a while I get the following error message: Traceback (most recent call last): File "/usr/bin/duplicity", line 1359, in with_tempdir(main) File "/usr/bin/duplicity", line 1342, in with_tempdir fn() File "/usr/bin/duplicity", line 1202, in main action = commandline.ProcessCommandLine(sys.argv[1:]) File "/usr/lib/python2.7/dist-packages/duplicity/commandline.py", line 942, in ProcessCommandLine globals.backend = backend.get_backend(args[0]) File "/usr/lib/python2.7/dist-packages/duplicity/backend.py", line 156, in get_backend return _backends[pu.scheme](pu) File "/usr/lib/python2.7/dist-packages/duplicity/backends/cloudfilesbackend.py", line 70, in __init__ self.container = conn.create_container(container) File "/usr/lib/python2.7/dist-packages/cloudfiles/connection.py", line 250, in create_container response = self.make_request('PUT', [container_name]) File "/usr/lib/python2.7/dist-packages/cloudfiles/connection.py", line 189, in make_request response = retry_request() File "/usr/lib/python2.7/dist-packages/cloudfiles/connection.py", line 182, in retry_request self.connection.request(method, path, data, headers) File "/usr/lib/python2.7/httplib.py", line 955, in request self._send_request(method, url, body, headers) File "/usr/lib/python2.7/httplib.py", line 989, in _send_request self.endheaders(body) File "/usr/lib/python2.7/httplib.py", line 951, in endheaders self._send_output(message_body) File "/usr/lib/python2.7/httplib.py", line 811, in _send_output self.send(msg) File "/usr/lib/python2.7/httplib.py", line 773, in send self.connect() File "/usr/lib/python2.7/httplib.py", line 1154, in connect self.timeout, self.source_address) File "/usr/lib/python2.7/socket.py", line 571, in create_connection raise err error: [Errno 101] Network is unreachable I use Rackspace CloudFiles as a storage backend, last backup was 3 days ago (successful. I have not changed any settings since then.

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• SIM card number swap

  - by DaGhostman Dimitrov

  Is it possible to swap two numbers between two sim cards (I am just got an new phone and it is using a micro sim) And I have a old number that I want to use but it is on standart sim card. Is it possible to swap the numbers between the cards using a SIM Card reader. What software and hardware should I use? Note: I have talked with my provider but I have to cancel my old numbers contract but I like it and do not want to pay the remaining period of the contract to turn it in to PayAsYouGo and then swap ..

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• Does semi-normalization exist as a concept? Is it "normalized"?

  - by Gracchus

  If you don't mind, a tldr on my experience: My experience tldr I have an application that's heavily dependent upon uncertainty, a bane to database design. I tried to normalize it as best as I could according to the capabilities of my database of choice, but a "simple" query took 50ms to read. Nosql appeals to me, but I can't trust myself with it, and besides, normalization has cut down my debugging time immensely over and over. Instead of 100% normalization, I made semi-redundant 1:1 tables with very wide primary keys and equivalent foreign keys. Read times dropped to a few ms, and write times barely degraded. The semi-normalized point Given this reality, that anyone who's tried to rely upon views of fully normalized data is aware of, is this concept codified? Is it as simple as having wide unique and foreign keys, or are there any hidden secrets to this technique? Or is uncertainty merely a special case that has extremely limited application and can be left on the ash heap?

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• How to make players be creative in a game, if the game cannot evaluate it?

  - by Mensonge

  I am working on a prototype game with several funny/visual effects that the player can trigger. The player can be quite creative in the way to use or combine these effects but it seems impossible to make detect/evaluate this creativity by the computer. So, from a game design perspective, I wonder what could be the features to drive the players to be creative (experiment various combinations). For the moment i think about "Draw something" where the result is evaluated by other players. I think about levels designed by "Little Big Planet" players but this aspect is out of the core game. I think also about "Minecraft" but I do not understand really how this game encourages the people to be creative (except of the open world). Please tell me if you have any ideas, articles or references that could help me coping with this problem.

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