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• Does my approach for building a real time monitoring system make sense? [closed]

  - by sameer

  I am developing an application that will display a dashboard that will display data from different SQL databases. This needs to happen in almost real time, our refresh time is about 5 minutes. My approach so far is: Develop a Windows service to accumulate the data from various SQL Server instances. Persist those details into a SQL DB, from which the dashboard will display them on the web page. Trigger fetching of data from the Windows service will every x minutes. The details of the SQL Server instances will be stored in the SQL DB which the Windows service will be referring. Does my approach make sense?

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• Upstart: sense of "stop on..." stanza when job is a task

  - by Binarus

  Hi, an upstart question (I think I have read all relevant man pages but could not find the answer there): What is the sense of using a "stop on ..." stanza in the definition of a job which is a task? The manuals tell us that such a job, after being started, just waits until its script (or exec stanza) is executed completely, and then stops automatically. Given that, what is the point in using "stop on ..." stanzas in such job definitions? For example, this is the job definition for Upstart's (very important) rc job in Natty 11.04 (leaving out comments and empty lines): start on runlevel [0123456] stop on runlevel [!$RUNLEVEL] export RUNLEVEL export PREVLEVEL console output env INIT_VERBOSE task exec /etc/init.d/rc $RUNLEVEL IMHO, the job, after being started by a runlevel event, will be stopped automatically as soon as /etc/init.d/rc $RUNLEVEL has finished. Thank you very much for any explanation!

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• About languages strongly typed with late binding, do they make sense?

  - by llazzaro

  I never learnt anything about VB6 (and I dont want to) but I wanted to search for bad things in computer software, so my first though was VB6. So for example, VB6 was strongly typed with late binding. Makes some sense to have a language with that combination? (I dont think so). I want to know reasons of why VB6 was like this! or why is good idea for a lenguage to be like this. Bad things that happend with a lengugage like this? good things?

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• Sense of "stop on..." stanza when job is a task

  - by Binarus

  Hi, an upstart question (I think I have read all relevant man pages but could not find the answer there): What is the sense of using a "stop on ..." stanza in the definition of a job which is a task? The manuals tell us that such a job, after being started, just waits until its script (or exec stanza) is executed completely, and then stops automatically. Given that, what is the point in using "stop on ..." stanzas in such job definitions? For example, this is the job definition for Upstart's (very important) rc job in Natty 11.04 (leaving out comments and empty lines): start on runlevel [0123456] stop on runlevel [!$RUNLEVEL] export RUNLEVEL export PREVLEVEL console output env INIT_VERBOSE task exec /etc/init.d/rc $RUNLEVEL IMHO, the job, after being started by a runlevel event, will be stopped automatically as soon as /etc/init.d/rc $RUNLEVEL has finished. Thank you very much for any explanation!

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• Unable to write DVD-R(Blank DVD's)

  - by FrozenKing

  I have a problem in dvd drive i.e. It can read CD/DVD and can write CD and all CD/DVD-RW but cannot write DVD DVD drive model is SH-S203B Samsung; I also have a log file created by nero burning rom 11. Actually the fact is no Blank DVD's are being read in my dvd drive only previously written dvd's can be read! Is this the problem of OS or should I try cleaning the dvd drive or my DVD drive is 4yrs old so is it going to spoil now, since it is showing this type of symptoms! OS = WinXP AV = KIS 2012 DVD Drive = Samsung SH-S203B (Also tried latest firmware and downgrade versions also) IA32 Nero Version: 11.2.4.100 Internal Version: 11,2,4,100 Recorder: <TSSTcorp CDDVDW SH-S203B>Version: SB04 - HA 1 TA 0 - 11.2.4.100 Adapter driver: <Serial ATA> HA 1 Drive buffer : 2048kB Bus Type : via Inquiry data CD-ROM: <TSSTcorp CDDVDW SH-S203B >Version: SB04 - HA 1 TA 0 - 11.2.4.100 Adapter driver: <Serial ATA> HA 1 18:58:10 #37 SPTI -1511 File SCSIPassThrough.cpp, Line 224 CdRom0: SCSIStatus(x02) WinError(0) NeroError(-1511) CDB Data: 0x28 00 00 00 00 00 00 00 10 00 Sense Key: 0x04 (KEY_HARDWARE_ERROR) Sense Code: 0x3E Sense Qual: 0x02 Sense Area: 0x70 00 04 00 00 00 00 0A 00 00 00 00 3E 02 Buffer x08047340: Len x8000 18:58:10 #38 SectorVerify 20 File Cdrdrv.cpp, Line 12057 Read errors from sector 0 to 14 <Padding> 18:58:19 #39 SPTI -1511 File SCSIPassThrough.cpp, Line 224 CdRom0: SCSIStatus(x02) WinError(0) NeroError(-1511) CDB Data: 0x28 00 00 00 00 10 00 00 10 00 Sense Key: 0x04 (KEY_HARDWARE_ERROR) Sense Code: 0x3E Sense Qual: 0x02 Sense Area: 0x70 00 04 00 00 00 00 0A 00 00 00 00 3E 02 Buffer x08047340: Len x8000 18:58:19 #40 SectorVerify 21 File Cdrdrv.cpp, Line 12057 Read error at sector 15 <Virtual Multisession Info> 18:58:19 #41 SectorVerify 20 File Cdrdrv.cpp, Line 12057 Read errors from sector 16 to 18 <Volume Structure Descriptor Sequence> 18:58:28 #42 SPTI -1511 File SCSIPassThrough.cpp, Line 224 CdRom0: SCSIStatus(x02) WinError(0) NeroError(-1511) CDB Data: 0x28 00 00 00 00 20 00 00 10 00 Sense Key: 0x04 (KEY_HARDWARE_ERROR) Sense Code: 0x3E Sense Qual: 0x02 Sense Area: 0x70 00 04 00 00 00 00 0A 00 00 00 00 3E 02 Buffer x08047340: Len x8000

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• Does it make sense to develop open source python library for database inspection?

  - by gruszczy

  Some time ago I came up with an idea for a library for database inspection. I started developing it and got some very basic functionality, just to check if that's possible. Recently however, I get second thoughts, whether such project would really be useful. I am actually planning to develop following software suite: library for python, that would provide easy interface to inspect database structure, desktop application in PyQt that would use the interface to provide graphical database inspection, web application in Django that would use the interface to provide database inspection through the browser. Do you think such suite would be useful for other developers/database administrators/analysts? I know, that there is pgadmin for PostgreSQL and some tool for sqlite3 and that there is Java tool called DBInspect. Usually I would be against creating new tool and rather join existing project, but I am not Java programmer (and I would rather stick to python or C, which I like) and none of these projects provide a library for database inspection. Anyway I would like to hear some opinions from fellow developers, whether such project make sense or I should try to spend my free time on developing something else.

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• How can I make sense of the word "Functor" from a semantic standpoint?

  - by guillaume31

  When facing new programming jargon words, I first try to reason about them from an semantic and etymological standpoint when possible (that is, when they aren't obscure acronyms). For instance, you can get the beginning of a hint of what things like Polymorphism or even Monad are about with the help of a little Greek/Latin. At the very least, once you've learned the concept, the word itself appears to go along with it well. I guess that's part of why we name things names, to make mental representations and associations more fluent. I found Functor to be a tougher nut to crack. Not so much the C++ meaning -- an object that acts (-or) as a function (funct-), but the various functional meanings (in ML, Haskell) definitely left me puzzled. From the (mathematics) Functor Wikipedia article, it seems the word was borrowed from linguistics. I think I get what a "function word" or "functor" means in that context - a word that "makes function" as opposed to a word that "makes sense". But I can't really relate that to the notion of Functor in category theory, let alone functional programming. I imagined a Functor to be something that creates functions, or behaves like a function, or short for "functional constructor", but none of those seems to fit... How do experienced functional programmers reason about this ? Do they just need any label to put in front of a concept and be fine with it ? Generally speaking, isn't it partly why advanced functional programming is hard to grasp for mere mortals compared to, say, OO -- very abstract in that you can't relate it to anything familiar ? Note that I don't need a definition of Functor, only an explanation that would allow me to relate it to something more tangible, if there is any.

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• Breadcrumbs in a modern web application, make sense? [on hold]

  - by Xtreme Biker

  I'm currently beginning with the development of a new web application. The whole web application is going to be bookmarkable and all the pages accesible via GET requests and url parameters. Having said that, let's suppose I've got three entities in my application, Customer, Team and City. Each Customer and Team belong to a city and I've got a city-detail page which displays the detail for a concrete city. So next navigation cases are possible: Customers - Customer detail (id=2) - City detail (id=3) Football teams - Team detail (id=5) - City detail (id=3) Cities - City detail (id=3) There are three possible ways of ending up in a city detail view. My question is, does it make sense to implement a breadcrumb to show such a history, having it available in the browser itself? Would it be more appropiate to show a breadcrumb with the last case, no matter where we're coming from (hierarchical breadcrumb)? That's what Jakob Nielsen points out here: Offering users a Hansel-and-Gretel-style history trail is basically useless, because it simply duplicates functionality offered by the Back button, which is the Web’s second-most-used feature. A history trail can also be confusing: users often wander in circles or go to the wrong site sections. Having each point in a confused progression at the top of the current page doesn’t offer much help. Finally, a history trail is useless for users who arrive directly at a page deep within the site. Also, even if the history trail seems the most natural way to implement it, it requires an extra effort to keep the whole track being HTTP a stateless mean.

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• Does it make sense to write a 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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• 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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• Creating predefinied camera views - How do I move the camera to make sense while using Controller?

  - by Deukalion

  I'm trying to understand 3D but the one thing I can't seem to understand is the Camera. Right now I'm rendering four 3D Cubes with textures and I set the Project Matrix: public BasicCamera3D(float fieldOfView, float aspectRatio, float clipStart, float clipEnd, Vector3 cameraPosition, Vector3 cameraLookAt) { projection_fieldOfView = MathHelper.ToRadians(fieldOfView); projection_aspectRatio = aspectRatio; projection_clipstart = clipStart; projection_clipend = clipEnd; matrix_projection = Matrix.CreatePerspectiveFieldOfView(projection_fieldOfView, aspectRatio, clipStart, clipEnd); view_cameraposition = cameraPosition; view_cameralookat = cameraLookAt; matrix_view = Matrix.CreateLookAt(cameraPosition, cameraLookAt, Vector3.Up); } BasicCamera3D gameCamera = new BasicCamera3D(45f, GraphicsDevice.Viewport.AspectRatio, 1.0f, 1000f, new Vector3(0, 0, 8), new Vector3(0, 0, 0)); This creates a sort of "Top-Down" camera, with 8 (still don't get the unit type here - it's not pixels I guess?) But, if I try to position the camera at the side to make "Side-View" or "Reverse Side View" camera, the camera is rotating to much until it's turned around it a couple of times. I render the boxes at: new Vector3(-1, 0, 0) new Vector3(0, 0, 0) new Vector3(1, 0, 0) new Vector3(1, 0, 1) and with the Top-Down camera it shows good, but I don't get how I can make the camera show the side or 45 degrees from top (Like 3rd person action games) because the logic doesn't make sense. Also, since every object you render needs a new BasicEffect with a new projection/view/world - can you still use the "same" camera always so you don't have to create a new View/Matrix and such for each object. It's seems weird. If someone could help me get the camera to navigate around my objects "naturally" so I can be able to set a few predtermined views to choose from it would be really helpful. Are there some sort of algorithm to calculate the view for this and perhaps not simply one value? Examples: Top-Down-View: I have an object at 0, 0, 0 when I turn the right stick on the Xbox 360 Controller it should rotate around that object kind of, not flip and turn upside down, disappear and then magically appear as a tiny dot somewhere I have no clue where it is like it feels like it does now. Side-View: I have an object at 0, 0, 0 when I rotate to sides or up and down, the camera should be able to show a little more of the periphery to each side (depending on which you look at), and the same while moving up or down.

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• Any sense to set obj = null(Nothing) in Dispose()?

  - by serhio

  Is there any sense to set custom object to null(Nothing in VB.NET) in the Dispose() method? Could this prevent memory leaks or it's useless?! Let's consider two examples: public class Foo : IDisposable { private Bar bar; // standard custom .NET object public Foo(Bar bar) { this.bar = bar; } public void Dispose() { bar = null; // any sense? } } public class Foo : RichTextBox { // this could be also: GDI+, TCP socket, SQl Connection, other "heavy" object private Bitmap backImage; public Foo(Bitmap backImage) { this.backImage = backImage; } protected override void Dispose(bool disposing) { if (disposing) { backImage = null; // any sense? } } }

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• Does it ever make sense to license source code as a learning resource under GPL?

  - by Earlz

  I recently came across a series of articles walking through how to make a scheme interpreter. I was browsing through the code when I realized that it was AGPL. For the most part, the code itself is the teaching tool. Basically, the code as-is is what I need, however, I did want to understand how it all fits together as well. I realized though that if I copy and paste a single line of code, my project would become AGPL. Possibly by even more trivial actions? Anyway, is this a standard practice at all? Am I just being over-paranoid? Also, what benefits are there to this licensing scheme?

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• Q&amp;A: Does it make sense to run a personal blog on the Windows Azure Platform?

  - by Eric Nelson

  I keep seeing people wanting to do this (or something very similar) and then being surprised at how much it might cost them if they went with Windows Azure. Time for a Q&A. Short answer: No, definitely not. Madness, sheer madness. (Hopefully that was clear enough) Longer answer: No because It would cost you a heck of a lot more than just about any other approach to running a blog. A site that can easily be run on a shared hosting solution (as many blogs do today) does not require the rich capabilities of Windows Azure. Capabilities such as simplified deployed and management, dedicated resources, elastic resources, “unlimited” storage etc. It is simply not the type of application the Windows Azure Platform has been designed for. Related Links: Q&A- How can I calculate the TCO and ROI when considering the Windows Azure Platform? Q&A- When do I get charged for compute hours on Windows Azure? Q&A- What are the UK prices for the Windows Azure Platform

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• Why it is called "hash table", or "hash function"? Hash doesn't make any sense to me here

  - by Saeed Neamati

  It's now about 4 years of development that I'm using, hearing, talking about, and implementing hash tables and hash functions. But I really never understand why it's called hash? I remember the first days I started programming, this term was kind'of cumbersome terminology to me. I never figured out what is it, based on its name. I just experimentally understood what it does and why and when should we use it. However, I still sometimes try to figure out why it's called hash. I have no problem with table or function and to be honest, they are pretty deductive, rational terms. However, I think better words could be used instead of hash, like key, or uniqueness. Don't key table or uniqueness table. According to my dictionary, hash means: Fried dish of potato and meats (highly irrelevant) # symbol (AKA number sign, pound sign, etc.) (still irrelevant, maybe just a mis-nomenclature) Apply algorithm to character string (still has nothing to do with uniqueness, which is the most important feature of a hash table) Cut food Another term for hashish Does anyone know why it's called hash?

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• Does it makes sense to backup the whole partition as opposed to their files?

  - by maaartinus

  I know that on Windows it's quite futile to try to backup the "C:" partition file-wise and that's why a full partition backup is needed. Is it OK to backup a the root Linux partition file-wise? Are there any downsides? Clarification Here, I don't care about advantages of partial backups. I'm going to do additional separate backups of /home, etc. What I'm interested in here is the comparison of backup of all files from / vs. backup of the whole partition as device What are the advantages of something like dd if=/dev/sda1 ...?

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• Does it make sense to write tests for legacy code when there is no time for a complete refactoring?

  - by is4

  I usually try to follow the advice of the book Working Effectively with Legacy Code. I break dependencies, move parts of the code to @VisibleForTesting public static methods and to new classes to make the code (or at least some part of it) testable. And I write tests to make sure that I don't break anything when I'm modifying or adding new functions. A colleague says that I shouldn't do this. His reasoning: The original code might not work properly in the first place. And writing tests for it makes future fixes and modifications harder since devs have to understand and modify the tests too. If it's GUI code with some logic (~12 lines, 2-3 if/else block, for example), a test isn't worth the trouble since the code is too trivial to begin with. Similar bad patterns could exist in other parts of the codebase, too (which I haven't seen yet, I'm rather new); it will be easier to clean them all up in one big refactoring. Extracting out logic could undermine this future possibility. Should I avoid extracting out testable parts and writing tests if we don't have time for complete refactoring? Is there any disadvantage to this that I should consider?

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• Does it make sense to use jQuery in modern-webkit-only web applications?

  - by futlib

  I'm lately working on a few mobile web apps for Android (2.3+) and iOS (4+). Their browsers support most of ECMAScript5, which is very powerful, and I wanted to use language features where possible, resorting to jQuery only when I had to. Turns out the only thing I use jQuery for is to have a shorter alternative for document.querySelectorAll. Might as well get rid of it. If I only have to support modern WebKit browsers, is it a good idea to get rid of jQuery (and other general-purpose libraries)? They are a layer of indirection, after all. (The apps don't have to make AJAX calls so far, I guess that's one thing that's going to get ugly. But is it worth keeping jQuery just for that?)

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• Does an inventory limit in an MMORPG make sense?

  - by Philipp

  I am currently developing a simple 2d MMORPG. My current focus is the inventory system. I am currently wondering if I should implement a limit on what a player character can carry. Either in form of a maximum weight, a limited number of inventory slots, or a combination of both. Almost every MMORPG I ever played limits inventory space. But plausibility aside, is this really necessary from a gameplay point of view? Maybe it would in fact improve the game experience when I just let the players carry as much stuff as they want. tl;dr: What is the game development rationale behind limiting carrying capacity of player characters?

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• How much sense does it make for a veteran .Net developer to move to ROR professionally?

  - by SharePoint Newbie

  Hi, I consider myself a moderately skilled (definitely not stupid) .Net developer. Over the past 5 years I've been working with ASP.Net, ASP.Net MVC, SharePoint, WPF, Silverlight, RDBMS (SQL Server and Oracle). I maintain/contribute a couple of .Net OSS. I've also picked up F# and Haskell over the previous year. I am currently employed at one of the better (best) software firms out there and would surely love to continue working here. However over the past 6 months opportunities in .Net have mostly dried up and all new work is headed towards ROR (and whatever is left towards Java). I have never been apprehensive about learning a new stack/language for fun and have previously picked up Haskell and Python in my free time. I am however apprehensive as to what impact moving to a new entirely different stack would have on my career. What would you do: Change jobs if you don't find anything on .Net soon. Try out the ROR stack for some time. If you find that its not your cup of tea, move back. (How would this impact my career and job opportunities in the longer run?) Also it would be very helpful if there are any ASP.Net MVC folks who have switched over to ROR professionally who can share their experiences. Edit: I have not done any development on a *nix box before. I've however used Ubuntu for fun and games. Sorry if this sounds subjective.

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• Game AI: Pattern for implementing Sense-Think-Act components?

  - by Rosarch

  I'm developing a game. Each entity in the game is a GameObject. Each GameObject is composed of a GameObjectController, GameObjectModel, and GameObjectView. (Or inheritants thereof.) For NPCs, the GameObjectController is split into: IThinkNPC: reads current state and makes a decision about what to do IActNPC: updates state based on what needs to be done ISenseNPC: reads current state to answer world queries (eg "am I being in the shadows?") My question: Is this ok for the ISenseNPC interface? public interface ISenseNPC { // ... /// <summary> /// True if `dest` is a safe point to which to retreat. /// </summary> /// <param name="dest"></param> /// <param name="angleToThreat"></param> /// <param name="range"></param> /// <returns></returns> bool IsSafeToRetreat(Vector2 dest, float angleToThreat, float range); /// <summary> /// Finds a new location to which to retreat. /// </summary> /// <param name="angleToThreat"></param> /// <returns></returns> Vector2 newRetreatDest(float angleToThreat); /// <summary> /// Returns the closest LightSource that illuminates the NPC. /// Null if the NPC is not illuminated. /// </summary> /// <returns></returns> ILightSource ClosestIlluminatingLight(); /// <summary> /// True if the NPC is sufficiently far away from target. /// Assumes that target is the only entity it could ever run from. /// </summary> /// <returns></returns> bool IsSafeFromTarget(); } None of the methods take any parameters. Instead, the implementation is expected to maintain a reference to the relevant GameObjectController and read that. However, I'm now trying to write unit tests for this. Obviously, it's necessary to use mocking, since I can't pass arguments directly. The way I'm doing it feels really brittle - what if another implementation comes along that uses the world query utilities in a different way? Really, I'm not testing the interface, I'm testing the implementation. Poor. The reason I used this pattern in the first place was to keep IThinkNPC implementation code clean: public BehaviorState RetreatTransition(BehaviorState currentBehavior) { if (sense.IsCollidingWithTarget()) { NPCUtils.TraceTransitionIfNeeded(ToString(), BehaviorState.ATTACK.ToString(), "is colliding with target"); return BehaviorState.ATTACK; } if (sense.IsSafeFromTarget() && sense.ClosestIlluminatingLight() == null) { return BehaviorState.WANDER; } if (sense.ClosestIlluminatingLight() != null && sense.SeesTarget()) { NPCUtils.TraceTransitionIfNeeded(ToString(), BehaviorState.ATTACK.ToString(), "collides with target"); return BehaviorState.CHASE; } return currentBehavior; } Perhaps the cleanliness isn't worth it, however. So, if ISenseNPC takes all the params it needs every time, I could make it static. Is there any problem with that?

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• Windows server's HDD Spin down daily/nightly - Does it makes sense?

  - by Riccardo

  A Windows Server 2003 R2 has the following hard disk configuration: - 3 internal hard disks attached to a 3Ware unit, configured in Raid 1 + spare unit - 3 external USB backup disks: 2 Verbatim 1TB (Samsung HD103SI) + 1 Western Digital 1TB (WD10EADS) The server runs 365 days per year, h24, however: - at daytime the server/user usage is limited to the internal hard disks - at nighttime there's no user usage, apart from scheduled maintenance tasks, basically the Server will be idle from 7PM to 8AM. apart from nighly backups (few hours). I was wondering if: (a) it makes any sense let Windows manage power savings, allowing disks to spin down accordingly, ** OR** let the disks stay awlays-on, to avoid permature wearing, due to continuous spin up/down (b) leave internal disks always on, and force external disks to power down while idle (this requires third party tools, such as Verbatim's Green button utility) Your thoughts?

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• does it still have any sense to directly drop mails that trigger RBLs?

  - by Luke404

  Once upon a time, using RBLs to drop mails was actually a good idea. These days seems it is no more possible for a reason or the other, so every one switched / is_switching to just use RBLs as another test in score based antispam solutions (read: SpamAssassin & friends). This gives good results, but neglects one of the benefits of RBLs, namely the ability to reject (supposed) spam before even receiving the message body. Is still there any RBL that makes sense to use that way, to hardly reject anything that fires a match in that list? If there are people doing it that way, do you ever get false positives due to the list?

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• Does it make sense to commit after every save with a DVCS?

  - by blockhead

  I know the question has been asked before how often to commit with a DVCS. All answers have one thing in common--as often as possible. But they're usually something like, after finishing a thought, a user story, getting code that compiles, or passing tests. I was thinking, given that a DVCS gives you you're own repository, with very cheap commits, doesn't it make sense, to commit after every change to a file? After all, this is what happens in NetBeans, and you get a nice free "time machine" without even asking for it. If not every change, then at least every save, or compile. Does this make sense, or do I have the wrong idea about DVCS. My feeling is that this not the workflow most people have with DVCS.

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• What is the sense of permiting the user to use no passwords longer than xx chars?

  - by reox

  Its more like a usability question or maybe database, or even maybe security (consider injection attacks) but what is the sense of permiting the user's password to a be not longer than xx chars? It does not make any sense to me, because longer passwords are mostly considered better and even harder to crack, and some users use password safes, so the password length should not matter. I understand that passwords with more than 20 chars are hardly to remember, but if you use diceware or password safe you dont have any problem with that. I really cant understand why there are sites that say "your password need to be between 5 and 8 chars"... also should the password saved as hash, so the length of the field in the database is fixed, so where is the problem? i think that most of the sites where the password is has to be a fixed length are not even using any hashing method...

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