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• Design patterns for Agent / Actor based concurrent design.

  - by nso1

  Recently i have been getting into alternative languages that support an actor/agent/shared nothing architecture - ie. scala, clojure etc (clojure also supports shared state). So far most of the documentation that I have read focus around the intro level. What I am looking for is more advanced documentation along the gang of four but instead shared nothing based. Why ? It helps to grok the change in design thinking. Simple examples are easy, but in a real world java application (single threaded) you can have object graphs with 1000's of members with complex relationships. But with agent based concurrency development it introduces a whole new set of ideas to comprehend when designing large systems. ie. Agent granularity - how much state should one agent manage - implications on performance etc or are their good patterns for mapping shared state object graphs to agent based system. tips on mapping domain models to design. Discussions not on the technology but more on how to BEST use the technology in design (real world "complex" examples would be great).

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• N-Tiered application design tool

  - by Ben V

  I'm beginning the design of a medium-sized web application. I usually like to design from the top down, i.e., start at the highest level and design my way down. I am planning to have the following layers: Presentation (PHP/Ajax) Business Logic Data Access Database Now I'd like to start sketching out the major objects in each layer and the interaction between layers. Is there a tool more specific to this purpose than just using a graphics/diagramming tool like Visio?

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• Good design of mapping Java Domain objects to Tables (using Hibernate)

  - by M. McKenzie

  Hey guys, I have a question that is more in the realm of design, than implementation. I'm also happy for anyone to point out resources for the answer and I'll gladly, research for myself. Highly simplified Java and SQL: Say I have a business domain POJO called 'Picture' with three attributes. class Picture int idPicture String fileName long size Say I have another business domain POJO called "Item" with 3 attributes Class Item int idItem String itemName ArrayList itemPictures These would be a normal simple relationship. You could say that 'Picture' object, will never exist outside an 'Item' object. Assume a picture belongs only to a specific item, but that an item can have multiple pictures Now - using good database design (3rd Normal Form), we know that we should put items and pictures in their own tables. Here is what I assume would be correct. table Item int idItem (primary key) String itemName table Picture int idPicture (primary key) varchar(45) fileName long size int idItem (foreign key) Here is my question: If you are making Hibernate mapping files for these objects. In the data design, your Picture table needs a column to refer to the Item, so that a foreign key relation can be maintained. However,in your business domain objects - your Picture does not hold a reference/attribute to the idItem - and does not need to know it. A java Picture instance is always instantiated inside an Item instance. If you want to know the Item that the Picture belongs to you are already in the correct scope. Call myItem.getIdItem() and myItem.getItemPictures(),and you have the two pieces of information you need. I know that Hibernate tools have a generator that can auto make your POJO's from looking at your database. My problem stems from the fact that I planned out the data design for this experiment/project first. Then when I went to make the domain java objects, I realized that good design dictated that the objects hold other objects in a nested way. This is obviously different from the way that a database schema is - where all objects(tables) are flat and hold no other complex types within them. What is a good way to reconcile this? Would you: (A) Make the hibernate mapping files so that Picture.hbm.xml has a mapping to the POJO parent's idItem Field (if it's even possible) (B) Add an int attribute in the Picture class to refer to the idItem and set it at instantiation, thus simplifying the hbm.xml mapping file by having all table fields as local attributes in the class (C) Fix the database design because it is wrong, dork. I'd truly appreciate any feedback

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• General Overview of Design Pattern Types

  Typically most software engineering design patterns fall into one of three categories in regards to types. Three types of software design patterns include: Creational Type Patterns Structural Type Patterns Behavioral Type Patterns The Creational Pattern type is geared toward defining the preferred methods for creating new instances of objects. An example of this type is the Singleton Pattern. The Singleton Pattern can be used if an application only needs one instance of a class. In addition, this singular instance also needs to be accessible across an application. The benefit of the Singleton Pattern is that you control both instantiation and access using this pattern. The Structural Pattern type is a way to describe the hierarchy of objects and classes so that they can be consolidated into a larger structure. An example of this type is the Façade Pattern.  The Façade Pattern is used to define a base interface so that all other interfaces inherit from the parent interface. This can be used to simplify a number of similar object interactions into one single standard interface. The Behavioral Pattern Type deals with communication between objects. An example of this type is the State Design Pattern. The State Design Pattern enables objects to alter functionality and processing based on the internal state of the object at a given time.

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• Design for XML mapping scenarios between two different systems [on hold]

  - by deepak_prn

  Mapping XML fields between two systems is a mundane routine in integration scenarios. I am trying to make the design documents look better and provide clear understanding to the developers especially when we do not use XSLT or any other IDE such as jDeveloper or eclipse plugins. I want it to be a high level design but at the same time talk in developer's language. So that there is no requirements that slip under the crack. 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 mapping XML fields between two systems? (without XSLT being 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 am trying to find out if there is a better way to represent XML mapping in your design documents. The widely accepted and used method seems to be using a simple table such as in the picture to illustrate the mapping. I am wondering if there are alternate ways/ tools to represent such as in Altova:

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• How to design good & continuous tiles

  - by Mikalichov

  I have trouble designing tiles so that when assembled, they don't look like tiles, but look like an homogeneous thing. For example on the image below: even though the main part of the grass is only one tile, you don't "see" the grid; you know where it is if you look a bit carefully, but it is not obvious. Whereas when I design tiles, you can only see "oh, jeez, 64 times the same tile". A bit like on that image: (taken from a gamedev.stackexchange question, sorry; no critic about the game, but it proves my point, and actually has better tile design that what I manage) I think the main problem is that I design them so they are independent, there is no junction between two tiles if put closed to each other. I think having the tiles more "continuous" would have a smoother effect, but can't manage to do it, it seems overly complex to me. I think it is probably simpler than I think once you know how to do it, but couldn't find a tutorial on that specific point. Is there a known method to design continuous / homogeneous tiles? (my terminology might be totally wrong, don't hesitate to correct me)

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• How can I design good continuous (seamless) tiles?

  - by Mikalichov

  I have trouble designing tiles so that when assembled, they don't look like tiles, but look like a homogeneous thing. For example, see the image below: Even though the main part of the grass is only one tile, you don't "see" the grid; you know where it is if you look a bit carefully, but it is not obvious. Whereas when I design tiles, you can only see "oh, jeez, 64 times the same tile," like in this image: (I took this from another GDSE question, sorry; not be critical of the game, but it proves my point. And actually has better tile design that what I manage, anyway.) I think the main problem is that I design them so they are independent, there is no junction between two tiles if put closed to each other. I think having the tiles more "continuous" would have a smoother effect, but can't manage to do it, it seems overly complex to me. I think it is probably simpler than I think once you know how to do it, but couldn't find a tutorial on that specific point. Is there a known method to design continuous / homogeneous tiles? (My terminology might be totally wrong, don't hesitate to correct me.)

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• Learning good OOP design & unlearning some bad habits

  - by Nick

  I have been mostly a C programmer so far in my career with knowledge of C++. I rely on C++ mostly for the convenience STL provides and I hardly ever focus on good design practices. As I have started to look for a new job position, this bad habit of mine has come back to haunt me. During the interviews, I have been asked to design a problem (like chess, or some other scenario) using OOP and I doing really badly at that (I came to know this through feedback from one interview). I tried to google stuff and came up with so many opinions and related books that I don't know where to begin. I need a good through introduction to OOP design with which I can learn practical design, not just theory. Can you point me to any book which meets my requirements ? I prefer C++, but any other language is fine as long as I can pick-up good practices. Also, I know that books can only go so far. I would also appreciate any good practice project ideas that helped you learn and improve your OOP concepts. Thanks.

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• Adobe Air turn based multiplayer Game, sockets vs http bandwidth

  - by Arin Aivazian

  I am developing an Adobe Air multiplayer game for iPad. It is turn based and not realtime. It is like checkers game. I want to use a client server model. I have found 2 options to connect to server so far: socket connection and http requests My question is: Is the bandwidth requirement for socket connection vs http requests different? I need the game to work with very low speed internet connections

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• Any multiplayer webgame engine based on Flex

  - by Hongyu Ouyang

  My team is developing a multiplayer webgame (like a virtual world) in a short time(several months using after-school time), and I wonder if there are any webgame engine based on Flex. When I googled it I got many results related to HTML5, but I doubted if it is suitable for quick development. Do anyone have the experience of developing a webgame using A good engine? Are there any engine recommended? I prefer actionscript and flex to a javascript or HTML5 solution.

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• Component-based Rendering

  - by Kikaimaru

  I have component Renderer, that Draws Texture2D (or sprite) According to component-based architecture i should have only method OnUpdate, and there should be my rendering code, something like spriteBatch.Draw(Texture, Vector2.Zero, Color.White) But first I need to do spriteBatch.Begin();. Where should i call it? And how can I make sure it's called before any Renderer components OnUpdate method? (i need to do more stuff then just Begin() i also need to set right rendertarget for camera etc.)

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• Group Policy drive maps fail with Error Code: 0x80070043

  - by Topherhead

  I'm running a Server 2008 R2 domain with all Windows 7 x64 bit client machines. All drives are mapped using Group Policy. Which were previously on a NAS We just built a new, huge, fast server. So I'm in the process of migrating all the network drives from the NAS to the new fileserver(fs). The old drive maps were mapped using group policy so I just went in and updated to the new server and selected the "Replace" option. But the drives just plain do not map. I do an RSOP on my machine and the error for the drive map is: Result: Failure (Error Code: 0x80070043) The other odd thing, though it may or may not have anything to do with it, is that the winning GPO shown is shown with its SID instead of its name. The SID is correct though. Accessing the shares through Explorer works fine, and mapping them manually works fine. Any ideas? Thanks Chris

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• Setting Proxy Server for IE 10 on Windows 8 using pac file and Group Policy

  - by Greg Bray

  We currently use group policy to configure a proxy server PAC file for Windows XP and Windows 7 computers on our network. We now are starting to get requests for Windows 8, but have noticed that our current GPO does not work for setting the proxy server on Windows 8 clients or server 2012. Is it possible to do this using a 2008 R2 domain controller or would we need to update our domain to a 2012 server? I found a reference to creating new GPO settings for "Internet Explorer 10 and 11" and vague references to using RSAT on Windows 8 to set IE 10 settings via preferences, but nothing that talks about using group policy to manage proxy settings.

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• Windows Service and Group Policy unable to access network share on Win2008 Domain

  - by Terence Johnson

  I have one computer on my domain that has suddenly stopped receiving software updates via group policy. Domain logins still work, and group policy on the machine is still being updated, so it knows that there are new packages to install and where to look for them, but every time it tries to install a package, it throws a 1622 error (location not found). Logged in users can reach the same network shares, and every other computer on network is installing the packages. Further investigation found that other services running as "System" on the problematic computer are also unable to authenticate to network shares. How do I diagnose/fix this computer's account in Active Directory? The computer account exists, and is a member of "Domain Computers" - or is there something else I should be looking at?

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• Group policy software installation feature on server 2008

  - by Force Flow

  What is the proper procedure for distributing software updates using group policy's software installation feature? For example, if I want to install Java, and Java 1.7u6 is already added as a package, should I: A) Remove the Java 1.7u6 package (selecting the "allow users to continue to use" option), and add Java 1.7u7? B) Add Java 1.7u7 and specify that it is an update to the existing 1.7u6 package? (Will this install the oldest version first, then install each update one after the other, or will it just install the latest package?) Note that this question is geared toward the operation of the software installation feature of group policy, not specifically the behavior of the Java installers. This could easily apply to the installation of Adobe Flash, Adobe Reader, or any other common software applications with frequent updates.

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• component Initialization in component-based game architectures

  - by liortal

  I'm develping a 2d game (in XNA) and i've gone slightly towards a component-based approach, where i have a main game object (container) that holds different components. When implementing the needed functionality as components, i'm now faced with an issue -- who should initialize components? Are components usually passed in initialized into an entity, or some other entity initialized them? In my current design, i have an issue where the component, when created, requires knowledge regarding an attached entity, however these 2 events may not happen at the same time (component construction, attaching to a game entity). I am looking for a standard approach or examples of implementations that work, that overcome this issue or present a clear way to resolve it

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• Word doesn't want to open hyperlinks, and I can't find the policy setting

  - by michaelb958

  So I have a Surface RT (running Windows RT 8.1), and I have some Word documents with links in them. The thing is, they don't work. When I try to activate one, this happens instead: It's kind of annoying. This is a personal device, so I am the organisation - and after much spelunking and web-searching, I still can't find the relevant policy, which means I can't change it. Is it talking about Group Policy or something else entirely? Is this a[nother] Windows RT limitation, or some obscure switch I haven't found yet, or...?

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• Level Design V.S. Modeler

  - by Ecurbed

  From what I understand being a level designer and a character/environment/object/etc Modeler are two different jobs, yet sometimes it feels like a Modeler can also do the job of the level designer. I know this also depends on the scale of the game. For small games maybe they are one and the same, but for bigger games they become two different jobs. I understand a background in some modeling could not hurt when it comes to level design, but the question I have is: Do jobs prefer people who can model for level designing? This way they can kill two birds with one stone and have someone to create the assets and design the level. What is your opinion of the training? Does level design contain skill sets that make them completely different from what a modeler can do, or is this an easy transition for a modeler to become a level designer? Can you be a bad level designer but a good modeler and vice versa?

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• Using idle time in turn-based (RPG) games for updating

  - by The Communist Duck

  If you take any turn based RPG game there will be large periods of time when nothing is happening because the game is looping over 'wait_for_player_input'. Naturally it seems sensible to use this time to update things. However, this immediately seems to suggest that it would need to be threaded. Is this sort of design possible in a single thread? loop: if not check_something_pressed: update_a_very_small_amount else keep going But if we says 'a_very_small_amount' is only updating a single object each loop, it's going to be very slow at updating. How would you go about this, preferably in a single thread? EDIT: I've tagged this language-agnostic as that seems the sensible thing, though anything more specific to Python would be great. ;-)

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• Group Policy processing and autologon on Windows 7

  - by Jason Berg

  I'm trying to accomplish a few things via Group Policy on Windows 7. Software Installation, map drives, map printer, etc. I've got these computers set to autologon. The problem I'm running into is that the computers logon before DHCP has done its thing. Therefore, they don't apply any group policies properly. How do I fix this? I've already set a policy to "Always wait for the network at computer startup and logon". I've read up a bit and this doesn't actually mean that it waits for DHCP. So it's a little pointless. Anything that would delay logon would work. Or if I can somehow make the computer wait for DHCP.

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• What platform to use for browser based turn based strategy game

  - by sunwukung

  I want to write a browser based strategy game that can be played by two players in separate locations. The game itself is predominantly turn based. To that end, I want to determine the correct platform on which to build this game. To prevent gamers "gaming" the system, the business logic needs to reside in the server. I could arguably use AJAX for a large part of the games functionality, but at two key points in the game loop, the opposing player can "counter" the current players move. In addition, when it's time for the players to swap, AJAX polling is likely to fall short, so it's starting to look like WebSockets is going to be a requirement to pull this off smoothly. So, the remaining question is regarding the back end. I'd kinda like to build this in Python/Flask - but this is primarily out of wanting to tackle a project with that language, not neccessarily because it's the appropriate tool for the job. The next most likely candidate has got to be NodeJS given it's (apparently) tighter integration with the WebSockets protocol. My question, then, is regarding the best platform on which to pursue this objective.

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• Green Website Design

  - by Christofian

  This is kindove a strange question, but... There was a site called Blackle ( http://www.blackle.com/) which "claimed" to save energy by using a black background (it doesn't: see here: http://skeptics.stackexchange.com/questions/4373/how-much-energy-does-displaying-a-webpage-with-a-black-background-actually-save). However, blackle and it's idea of "green website design" interested me, and I was wondering if there are any ways to design an energy saving website that actually save energy. If anyone knows of any, please post them here. If nobody has any, then I guess there isn't a way to save energy through website design...

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• How to design network protocols

  - by dandroid

  As a programmer, you work on your software design skills. You learn about things such as modularity and reusability and how you can achieve them in code. There's plenty of literature on the subject and engineers talk about it all the time. What about if you want to design network protocols? How do you judge that protocol X is badly designed while Y is well designed? (eg. in programming you are often pointed out to a well-written piece of code in order to learn from it - what is the equivalent for network protocols?) For example, suppose I want to design a P2P protocol similar to BitTorrent or I want to make a better version of the Socks protocol. How would I go about doing a good job on this? Thanks!

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• Group policy preventing XenApp from creating start menu menus

  - by JohnyV

  I have a citrix Xenapp server that has some apps installed. The are placed in a folder and set to populate the start menu. The problem is when I log on with a user from a particular OU I am unable to get the start menu inserted from xenapp. It is quite a restrictive group policy but does anyone know the setting for preventing users from modifying the start menu. I have tried "Prevent changes to Taskbar and Start Menu Settings" but this didnt work. Any ideas would be great. I know it isnt permissions because I have another user that has the same permissions assigned to them, the only difference is that one user gets the restrictive group policy and the other doesnt. Thanks

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• Advice about a website design [closed]

  - by Dimitri

  I am web developer newbie. It doesn't mean that I don't know html/css/javascript but I am not good for web design. I am making a website for friend about a barber shop but I am not totally happy of my work due to lack of design. I would like to have some advice about the website and how can I improve the design? The website is in french because i am french. Here is the website : http://afrostyle92.fr/.

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