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• Design Patterns - do you use them?

  - by seth

  Being an IT student, I was recently given some overview about design patterns by one of our teachers. I understood what they are for but some aspects still keep bugging me. Are they really used by the majority of programmers? Speaking of experience, I've had some troubles while programming, things I could not solve for a while, but google and some hours of research solved my problem. If somewhere in the web I find a way to solve my problem, is this a design pattern? Am I using it? And also, do you (programmers) find yourself looking for patterns (where am I supposed to look btw?) when you start the development? If so, this is certainly a habit that I must start to embrace.

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• Software design methods for Java or any other programming language

  - by IkerB

  I'm junior programmer and I would like to know how professionals write their code or which steps they follow when they are creating new software. I mean, which steps they follow, which programming methodology, software architecture design application software, etc. I would like to find a tutorial where they explain from the beginning which steps I have to follow from The Idea I have in my mind to the final version of the application in any language. Or perhaps how is your programming steps or rules that you used to follow. Because everytime I want to create the an application I spend few time on the design and a lot of time coding (I know, that's not good).

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• All around design book for a developer (Javascript dev)

  - by Alex Angelini

  I have begun doing a lot of javascript development recently, mostly front-end but also using node.js. As I am currently in the transition from large company to startup, they expect me as a front end developer to know how to produce semi decent designs (Which I cannot) I am looking for a book (or set of screencasts) to give me some good well rounded advice on design. I know CSS, but my design are always awful looking, I also know nothing about Photoshop (and am on Linux and have no access to it) What are your picks? I am not looking to be a full time designer I would just like to be able to contribute.

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• initial Class design: access modifiers and no-arg constructors

  - by yas

  Context: Student working through Class design in personal/side project for Summer. I've never written anything implemented by others or had to maintain code. Trying to maximize encapsulation and imagining what would make code easy to maintain. Concept: Tight/Loose Class design where Tight and Loose refer to access modifiers and constructors. Tight: initially, everything, including setters, is private and a no-arg constructor is not provided (only a full constructor). Loose: not Tight Exceptions: the obvious like toString Reasoning: If code, at the very beginning, is tight, then it should be guaranteed that changes, with respect to access/creation, should never damage existing implementations. The loosening of code happens incrementally and must be thought through, justified, and safe (validated). Benefit: Existing implementing code should not break if changes are made later. Cost: Takes more time to create. Since this is my own thinking, I hope to get feedback as to whether I should push to work this way. Good idea or bad idea?

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• design practice for business layer when supporting API versioning

  - by user1186065

  Is there any design pattern or practice recommended for business layer when dealing with multiple API version. For example, I have something like this. http://site.com/blogs/v1/?count=10 which calls business object method GetAllBlogs(int count) to get information http://site.com/blogs/v2/?blog_count=20 which calls business object method GetAllBlogs_v2(int blogCounts) Since parameter name is changed, I created another business method for version 2. This is just one example but it could have other breaking changes for which it requires me to create another method to support both version. Is there any design pattern or best practice for business/data access layer I should follow when supporting API Versioning?

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• Design difficulty for multiple panel forms [closed]

  - by petre

  I have form that consists of multiple panel on the right, a treeview on the left and a terminal richtextbox on the bottom. When i click on a node of the treeview i bring up the panel that is attached with the node. For example i have 10 nodes on the treeview, i have 10 panels that are attached to this nodes. On every panel, i have many textboxes, labels, comboboxes etc. I don't dynamically construct and dispose the items on the panels, i create the items in the designer file of the project. In that case, there is a problem. I really find it difficult to align or place items on the panel because there seems a lot of aligning lines on the screen. What should be done to make the design of the panels easy? I don't want to construct items dynamically. Do i have to do that dynamically or is there a design procedure that make this process easy?

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• Code Design question, circular reference across classes?

  - by dsollen

  I have no code here, as this is more of a design question (I assume this is still the best place to ask it). I have a very simple server in java which stores a mapping between certain values and UUID which are to be used by many systems across multiple platforms. It accepts a connection from a client and creates a clientSocket which stores the socket and all the other relevant data unique to that connection. Each clientSocket will run in their own thread and will block on the socket waiting for a read. I expect very little strain on this system, it will rarely get called, but when it does get a call it will need to respond quickly and due to the risk of it having a peak time with multiple calls coming in at once threaded is still better. Each thread has a reference to a Mapper class which stores the mapping of UUID which it's reporting to others (with proper synchronization of course). This all works until I have to add a new UUID to the list. When this happens I want to report to all clients that care about that particular UUID that a new one was added. I can't multicast (limitation of the system I'm running on) so I'm having each socket send the message to the client through the established socket. However, since each thread only knows about the socket it's waiting on I didn't have a clear method of looking up every thread/socket that cares about the data to inform them of the new UUID. Polling is out mostly because it seems a little too convoluted to try to maintain a list of newly added UUID. My solution as of now is to have the 'parent' class which creates the mapper class and spawns all the threads pass itself as an argument to the mapper. Then when the mapper creates a new UUID it can make a call to the parent class telling it to send out updates to all the other sockets that care about the change. I'm concerned that this may be a bad design due to the use of a circular reference; parent has a reference to mapper (to pass it to new ClientSocket threads) and mapper points to parent. It doesn't really feel like a bad design to me but I wanted to check since circular references are suppose to be bad. Note: I realize this means that the thread associated with whatever socket originally received the request that spawned the creation of a UUID is going to pay the 'cost' of outputting to all the other clients that care about the new UUID. I don't care about this; as I said I suspect the client to receive only intermittent messages. It's unlikely for one socket to receive multiple messages at one time, and there won't be that many sockets so it shouldn't take too long to send messages to each of them. Perhaps later I'll fix the fact that I'm saddling higher work load on whatever unfortunate thread gets the first request; but for now I think it's fine.

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• Scenario to illustrate how unit testing leads to better design

  - by Cocowalla

  For an internal training session, I'm trying to come up with a simple scenario that illustrates how unit testing leads to better design, by forcing you to think about things like coupling before you start coding. The idea is that I get the participants to code something first, without considering unit testing, then we do it again, but considering unit testing. Hopefully the code produced second time round should be more decoupled and maintainable. I'm struggling to come up with a scenario that can be coded quickly, yet can still demonstrate how unit testing can lead to better overall design.

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• Design Patterns - Service Layer

  - by garfbradaz

  I currently reading a lot about Design Patterns and I have been watching various Pluralsight videos from their library. Now so far I have learnt the following: Repository Pattern Unit of Work Pattern Abstract Factory Pattern Reading the awesome "DI in .NET" book Now I read lot about Services and Service Layers and wanted some advice about the best place to read up and learn about these. I presume this fits into Domain Driven Design and I should start there? The term "Service" just seem to be used widely within IT and it can be confusing the exact meaning. So my questions is: What is the Service Layer Where is the best place to learn about them. I know there are probably tonnes of interweb/books/blogs on the subject, but some good areas to start from would be nice. If I'm being too vague, let me know.

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• What Design Pattern is seperating transform converters

  - by RevMoon

  For converting a Java object model into XML I am using the following design: For different types of objects (e.g. primitive types, collections, null, etc.) I define each its own converter, which acts appropriate with respect to the given type. This way it can easily extended without adding code to a huge if-else-then construct. The converters are chosen by a method which tests whether the object is convertable at all and by using a priority ordering. The priority ordering is important so let's say a List is not converted by the POJO converter, even though it is convertable as such it would be more appropriate to use the collection converter. What design pattern is that? I can only think of a similarity to the command pattern.

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• The Design of the Namecheap Site [on hold]

  - by Guest

  I was just wondering what design Namecheap.com is using for their site. I asked their support personnel and I suppose the employees aren't generally aware. It really looks like a customized wordpress site, but I was wondering if anyone here knew any more details about their setup. Been googling for it but the problem is, since namecheap DEALS with CMS's/web design for their business, you'll get google hits regarding their business rather than describing their site itself. Just interested. If anyone's got any info on it let me know.

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• What Design Pattern is separating transform converters

  - by RevMoon

  For converting a Java object model into XML I am using the following design: For different types of objects (e.g. primitive types, collections, null, etc.) I define each its own converter, which acts appropriate with respect to the given type. This way it can easily extended without adding code to a huge if-else-then construct. The converters are chosen by a method which tests whether the object is convertable at all and by using a priority ordering. The priority ordering is important so let's say a List is not converted by the POJO converter, even though it is convertable as such it would be more appropriate to use the collection converter. What design pattern is that? I can only think of a similarity to the command pattern.

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• Design Pattern for Data Validation

  - by melodui

  What would be the best design pattern for this problem: I have an Object A. Object A can either be registered or deleted from the database depending on the user request. Data validation is performed before registration or deletion of the object. There are a set of rules to be checked before the object can be registered and another set of rules for deletion. Some of these rules are common for both operations. So far, I think the Chain of Responsibility design pattern fits the most but I'm having trouble implementing it.

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• What is realism?

  - by eversor

  Beyond the obvious something that seams real, realism in games is a hard feature to hit. In some cases, things that are completely impossible in real life are seen as realistic by gamers. For instance, in some FPS you can survive being hit by a fair amount of bullets when in real life one is enough, Newton-defying car drifts, etc. So, in some cases, reductions of life-like actions or consequences implies a bigger sense of realism. The root of this pseudo-philosophical question lies in: I am going to create a engine for battles in an online (browser-based) strategic game. Browser-based means that the battle would not be seen. And i do not know how to approach this realism issue.

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• Install McAfee ePO Agent via Group Policy

  - by neildeadman

  We have recently deployed ePO to our infrastructure, but the Agent will not deploy to all systems. We suspect this is a firewall issue as disabing Windows Firewall generally makes it work. We have decided to install the Agent via Group Policy to make sure all systems get the it and then ePO will deploy VirusScan on reboot. Following the manual I have run: Framepkg.exe /gengpomsi /SiteInfo=<sharedpath>\SiteList.xml /FrmInstLogLoc=<localtempDir> \<filename>.log and then created the GPO, but it never installs. Has anyone managed to get this working? Or maybe they can suggest a resolution for the failed installs of Agent deploy from ePO?

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• Distributing Files using a Group Policy on Windows Server 2003

  - by tonedeath

  A piece of software that we use at our office has recently moved to a new licensing system. This means that from now on a new set of license key files will need to be distributed to each of our 25 client installations every year. All of the clients run XP and are part of an AD domain controlled by a Windows 2003 DC. I'm already using group policies to deploy software updates. I gather that this is possible with Group Policy Preferences in Server 2008. I'm just looking for a good method using Server 2003. The same set of files need copying to each client. I also have them hosted on a network share accessible by each client. I'm more of a *nix person, so I'm not particularly up on scripting in a Windows environment.

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• How can give group in active directory folder access by group policy

  - by AAA-Super

  I have windows server 2003 64bit and my clients running on windows xp 32bit. My clients have user rights so they can't install any program. I have some programs needs admin rights for example I have French dictionary without admin right the program will not work properly. I don't want go to each PC and login with admin account then go to program folder located in programs files to give full permission to the group. Is there a way to add them folder in group policy so I can force all the PCs to have full access on the folder? Thanks you in advance.

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• Group Policy for IE Security Zones

  - by Doug Luxem

  We are currently using the following Group Policy to control the Internet Explorer security zones: User Configuration\Administrative Templates\Windows Components\Internet Explorer\Internet Control Panel\Security Page Then setting the Site to Zone Assignment List with the various values using the following chart: Value Setting ------------------------------ 0 My Computer 1 Local Intranet Zone 2 Trusted sites Zone 3 Internet Zone 4 Restricted Sites Zone This works well; however, users are then unable to edit (or especially add) to their zone settings. Is there a way to lock in our custom zone settings while still giving users the ability to add their own sites to the security zones? Yes, I do realize the slight security risk in opening this up.

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• Group policy applied to AD OU attributes

  - by Eric Smith

  I'm not well-versed in AD, so would like to resolve a question I have with regards to AD information. I understand that it is possible to apply group policy to OU's, thereby restricting access. What I'd like to know is, is it possible to do the same with OU attributes. Some context would help. There's a requirement to store address information in AD (IMO, a natural fit), but for various reasons, although obviously things like name should be globally accessible, access restrictions are desired on the address. In this case, is it possible to apply security to the address portion of the OU attributes, or does each address have to be broken into a separate OU (a solution that feels smelly given that address doesn't have identity)?

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• How do I package this vbscript as a msi for Group Policy

  - by TheCleaner

  I had a developer that is no longer with us create an msi to do this for me, but the package is outdated now and we need to deploy new files. Basically I need to do the following: Take the code at the bottom of this question and deploy it to all users as a software install package in Group Policy. I don't want to use a computer startup script because I don't want this to run at every login...just once to install and be done. How can I take the below and turn it into an msi for deployment through GPO? @echo off delete "C:\Windows\Downloaded Program Files\jdeexpimp.inf" delete "C:\Windows\Downloaded Program Files\jdeexpimpU.ocx" delete "C:\Windows\Downloaded Program Files\jdewebctls.inf" delete "C:\Windows\Downloaded Program Files\jdewebctlsU.ocx" copy "\\tuldc01\EOneActiveXapplets\ActiveX898\jdeexpimpU\*" "C:\Windows\Downloaded Program Files\" copy "\\tuldc01\EOneActiveXapplets\ActiveX898\jdewebctlsU\*" "C:\Windows\Downloaded Program Files\" regsvr32 "C:\Windows\Downloaded Program Files\jdeexpimpU.ocx" regsvr32 "C:\Windows\Downloaded Program Files\jdewebctlsU.ocx"

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• Group policy results failing with "Invalid class" error

  - by bshacklett

  When trying to run the Group Policy Results Wizard against a specific workstation, I'm getting the following error: The wizard was unable to generate the computer or user's data due to insufficient permissions. Details: Invalid class I'm guessing that the class being referred to is a WMI class, but I haven't gotten much farther. I've run sfc /scannow on the machine with no luck. I've also followed all of the recommendations in this article: http://windowsxp.mvps.org/repairwmi.htm. I cannot find anything useful in the event logs and I can't think of anywhere else I could look to find out what's really happening here. Any help would be appreciated.

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• Windows policy settings: overriding machine settings for specific user

  - by Ophir Yoktan

  I want use windows policy setting to limit access to removable media. This can be done by setting [HKEY_USERS\<uid>\SOFTWARE\Policies\Microsoft\Windows\RemovableStorageDevices] "Deny_All"=dword:00000001 for limiting a specific user [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\RemovableStorageDevices] "Deny_All"=dword:00000001 for all users on the machine. I'm looking for a method to limit all users, with the exception of one specific local user. However, the limitation appears to be additive - there is no way (that I know of) to define an exception for a specific user. Is there some kind of alternative?

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• Group policy to disable notifications of particular errors?

  - by resolver101

  How do i disable the notifications of particular errors? A little background to my issue. During the installation of the Kaspersky, it disables all the windows firewall for all except the domain. I have remedied this by creating an offline policy in Kaspersky which enables the Kaspersky firewall when out of the office (ie not connected to the office network). The problem now is that users in the office now see a notification showing that the firewall is disabled even though it’s enabled in all scenarios. It’s just that work and home show as disabled when the clients are connected to the office LAN. I’ve looked into the notifications and you can disable the notification (not recommended) but I don’t want to do this incase other relevant messages are stopped from being displayed. http://blogs.technet.com/b/networking/archive/2010/12/16/disabling-firewall-alerts-in-the-action-center.aspx

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• Installing Office 2010 without through group policy without an msi

  - by Ri Caragol

  I have been breaking my head for several days now trying to install Microsoft office 2010 through group policy. Unfortunately Microsoft decided it would be fun to release office without an MSI and so I either 1) need to create an msi for it or 2) need to install it through a logon script that would run the setup.exe from a network location. Any advise would be greatlly appreciated. I tried to create a script but even though I double click it and it runs properly, it does not seem to kick in when users log in or when the machine is turned on. Also is there an easy way to create an msi? thanks! -Ri

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• Local Group Policy Editor reverting setting to default

  - by Timur Aydin

  On my Windows 7 Ultimate 32bit system, I have changed the following setting: Local Computer Policy - Computer Configuration - Windows Settings - Security Settings - Local Policies - User Right Assignment - Deny access to this computer from the network This setting was by default "Guest" and I deleted this so that Guest can access a defined network share over the LAN. But later, I have changed my mind and wanted to return this setting to its default. So I edited that setting and specified Guest. But the setting became MYWINPC\Guest. So my question is, what is the difference between the previous setting "Guest" and MYWINPC\Guest? And how do I return this setting to its default value, "Guest"?

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