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• design for a parser to handle very large files

  - by user619818

  I have written a program which records protocol messages between an application and a hardware device which matches each application request with each hardware response. This is so that I can later remove the hardware, connect a 'replay' application to the main application and wait for an application request and reply with a matched copy of the requisite hardware reply message. My replay application saves the matched request/response in a list (using C++ std::list). This works fine on a small interaction session. My problem now is that I need to be able to use the replay over a long long session. With my current implementation, the replay program eventually uses up all available memory on my computer and crashes. So I need some sort of lookahead - and not parse the whole session in one go. Can anyone make any suggestions on how to get started?

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• split large text file without missing data record

  - by Santosh

  I have a 140 MB text file, which contains detail information of books in library. For each book details there is a standard format data details in text file. I need to parse it and insert the data in Database. Here, parsing text file is not an issue. I am facing problem in parsing this large file. So i decided to split the file in small file around 2 MB each file. But i can't manually split this large file in so many pieces. I got HJsplit tool, which split the file but this also doesn't helped as this split the file but 1 book details half part is in one file and rest part is in second file. so if i split this way then information will be missed. How to split the large so that i cant miss the information ? Is there any tool which help me in this condition.

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• Vector.Unproject - Checking if a model intersects a large sprite

  - by Fibericon

  Let's say I have a sprite, drawn like this: spriteBatch.Draw(levelCannons[i].texture, levelCannons[i].position, null, alpha, levelCannons[i].rotation, Vector2.Zero, scale, SpriteEffects.None, 0); Picture levelCannon as being a laser beam that goes across the entire screen. I need to see if my 3d model intersects with the screen space inhabited by the sprite. I managed to dig up Vector.Unproject, but that seems to only be useful when dealing with a single point in 2d space, rather than an area. What can I do in my case?

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• Instantiate proper class based on some input

  - by Adam Backstrom

  I'm attempting to understand how "switch as a code smell" applies when the proper code path is determined by some observable piece of data. My Webapp object sets an internal "host" object based on the hostname of the current request. Each Host subclass corresponds to one possible hostname and application configuration: WwwHost, ApiHost, etc. What is an OOP way for a host subclass to accept responsibility for a specific hostname, and for Webapp to get an instance of the appropriate subclass? Currently, the hostname check and Host instantiation exists within the Webapp object. I could move the test into a static method within the Host subclasses, but I would still need to explicitly list those subclasses in Webapp unless I restructure further. It seems like any solution will require new subclasses to be added to some centralized list.

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• Getting started on Large Projects

  - by Mercfh

  So I just graduated from my College with a B.S. in Comp. Science (although it was a good school, we're the only accredited CS department in our state.....for w/e that means lol) I feel like im a decent programmer, not amazing....but not terrible. Anyways I got my first job about 2 weeks ago, it's a pretty entry level job: firmware development/tester (I know I know people look down on testers...but I gotta start somewhere). Anyways there isn't a whole lot of coding to be had right now (mostly simple stuff) but here soon I have the option of helping out with development (which is what I want to do) Thing is....I have NEVER worked on a huge project. I mean in school sure we had "group" projects but nothing really big. So I'm not super familiar with HUGE classes and such (main language was C++)....Is this something I'll just get used to with time? Some fellow students were used to that with internships and such...but I never got that chance. My job was mostly a "one man job" kinda thing. Mostly little things. Plus in class we never did huge projects anyways. So how do you guys I guess "plan" out these things? Do you use a whiteboard and plan out classes and such....or what. Also...another worry of mine is that I have to use google......ALOT for examples of code, because sometimes I just don't get how something works. Is this normal? It makes me feel sorta.....stupid I guess. I mean "technically" i've had 4-5 years coding experience......but it really only feels like I had 2 years of REAL experience. If that makes any sense? Thanks

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• Notification framework for object lifecycle

  - by rlandster

  I am looking for an application, framework, or library that would help us with "object life-cycle management". There are many things that are created for users, departments, and services that, all too often, are left unmanaged. Some examples: user accounts groups SSL certificates access rights databases software license provisionings storage list-serve accounts These objects are created and managed by a wide variety of applications and systems. Typically, a user (person) requests (either explicitly or implicitly) one of these objects. A centralized management tool would help us manage such administration chores as: What objects does user X currently own/manage? Move the ownership of object P to user X; move all objects owned by user X (who was just been fired) to user Y. For all objects of type T that have expired be sure the objects have been disabled or deleted by their provider. How many active (expired, about-to-expire) objects of type P are there? Send periodic notifications to all users who own active objects of type P reminding them of what they own. There is a security alert for objects of type P; send a notification to all users who own these types of objects to take a specific remedial action. Delete or disable a set of objects based on expiration (or some other criteria). These objects are directly managed through their own applications (Active Directory, MySql, file systems, etc.) and may even have their own notification systems, but I want to centralize this into an "object management system". The OMS should allow the association with an external identity provider that defines who the users and groups are (e.g., LDAP, Active Directory) creation of objects association of an object to a specific user and/or group association with an expiration date creation of flexible reporting including letting users know what objects they currently own and their expiration dates integration with an external object "provider" via a plug-in We could write something from scratch, but I am hoping there is something already out there that will help, either an entire application or a set of libraries that provide much of what is needed. Any ideas?

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• Handle complexity in large software projects

  - by Oliver Vogel

  I am a lead developer in a larger software projects. From time to time its getting hard to handle the complexity within this project. E. g. Have the whole big picture in mind all the time Keeping track of the teammates work results Doing Code Reviews Supply management with information etc. Are there best practices/ time management techniques to handle these tasks? Are there any tools to support you having an overview?

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• Business knowledge in a large financial org?

  - by Victor

  As a programmer working in the finance industry, I recently got a project that is a hedge fund adminsitrative application(used to calculate NAVs, allocate assets etc.) From a business point of view this is a good thing. When we think of our 'next' project, typically the impulse is to think in terms of technology. e.g: 'I want to work on a project that uses SOA/cloud etc etc.' I am interested to know if anyone while career planning also takes into account the business aspect of a future project. i.e. what the application does. So does anybody ever think like this : 'I wish to work on a trading system so I can understand capital markets better.' instead of 'I want to work on a project that uses SOA/cloud etc etc.' I say this because it appears to me in the finance domain, for senior position, good business knowledge pays well. So maybe a guy that knows more business but maybe not so much latest technologies is at an advantage? The rockstar programmer seems more suited for an aggressive startup. Particularly big old finance orgs rarely invest in tech just for the 'cool factor'. No?

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• Why is my content database so large?

  - by PeterBrunone

  If your SharePoint site collection hasn't grown, but your content database has, the most likely culprit is versioning.  If a list -- or worse, a library -- has versioning enabled, the default is to keep every single one.  That means that every time someone edits and checks in a document, its storage footprint increases by the size of the document (and probably a little more).The solution?  It could be a bit painful, but you'll need to go back into each library and restrict the number of versions to keep (three is sufficient for most uses, but your needs may vary).  I suggest keeping only major versions as well, since minor versions are really just stopping points on the way to a published document.Of course if you have a real business need to keep all those versions around, then you'll want to look into an archiving solution that will take the old versions out of the content database but still make them available if necessary.

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• Why are Back In Time snapshots so large?

  - by Chethan S.

  I just backed up the contents of my home partition onto my external hard drive using Back In Time. I browsed to the backed up contents in the external drive and under properties it showed me the size as 9.6 GB. As I read that in next snapshots I create, Back In Time does not backup everything but creates hard links for older contents and saves newer contents, I wanted to test it. So I copied two small files into my home partition and ran 'Take Snapshot' again. The operation completed within a minute - first it checked previous snapshot, assessed the changes, detected two new files and synced them. After this when I browsed to the backed up contents, I was surprised to see the newer and older backup taking up 9.6 GB each. Isn't this a waste of hard drive space? Or did I interpret something wrongly?

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• Static pages for large photo album

  - by Phil P

  I'm looking for advice on software for managing a largish photo album for a website. 2000+ pictures, one-time drop (probably). I normally use MarginalHack's album, which does what I want: pre-generate thumbnails and HTML for the pictures, so I can serve without needing a dynamic run-time, so there's less attack surface to worry about. However, it doesn't handle pagination or the like, so it's unwieldy for this case. This is a one-time drop for pictures from a wedding, with a shared usercode/password for distribution to the guests; I don't wish to put the pictures in a third-party hosting environment. I don't wish to use PHP, simply because that's another run-time to worry about, I might relent and use something dynamic if it's Python or Perl based (as I can maintain things written in those). I currently have: Apache serving static files, Album-generated, some sub-directories to divide up the content to be a little more manageable. Something like Album but with pagination already handled would be great, but I'm willing to have something a little more dynamic, if it lets people comment or caption and store the extra data in something like an sqlite DB. I'd want something light-weight, not a full-blown CMS with security updates every three months. I don't want to upload pictures of other peoples' children into a third-party free service where I don't know what the revenue model is. (For my site: revenue is none, costs out of pocket). Existing server hosting is *nix, Apache, some WSGI. Client-side I have MacOS. Any advice?

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• Is there a way to avoid type-checking in this scenario?

  - by Prog

  I have a class SuperClass with two subclasses SubClassA and SubClassB. I have a method in a different class which takes a SuperClass parameter. The method should do different things depending on the type of the object it receives. To illustrate: public void doStuff(SuperClass object){ // if the object is of type SubClassA, do something. // if it's of type SubClassB, do something else. } I want to avoid type-checking (i.e. instanceof) because it doesn't feel like proper OO design. But I can't figure out how to employ Polymorphism to elegantly solve this problem. How can I solve this problem elegantly?

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• How to estimate effort required to convert a large codebase to another language/platform

  - by Justin Branch

  We have an MFC C++ program with around 200,000 lines of code in it. It's pretty much finished. We'd like to hire someone to convert it to work for Macs, but we are not sure how to properly estimate a reasonable timeline for this project. What techniques can we use to estimate what it would take to convert this project to work on a Mac? Also, is there anything in particular we should be watching out for specific to this sort of conversion?

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• Converting large files in python

  - by Cenoc

  I have a few files that are ~64GB in size that I think I would like to convert to hdf5 format. I was wondering what the best approach for doing so would be? Reading line-by-line seems to take more than 4 hours, so I was thinking of using multiprocessing in sequence, but was hoping for some direction on what would be the most efficient way without resorting to hadoop. Any help would be very much appreciated. (and thank you in advance) EDIT: Right now I'm just doing a for line in fd: approach. After that right now I just check to make sure I'm picking out the right sort of data, which is very short; I'm not writing anywhere, and it's taking around 4 hours to complete with that. I can't read blocks of data because the blocks in this weird file format I'm reading are not standard, it switches between three different sizes... and you can only tell which by reading the first few characters of the block.

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• How effectively "sell" a good design in large meetings

  - by User1

  Many times I have witnessed a sad tragedy. Here's what happens: A team design review for a new project. I see a simple design that has quite a few holes. I casually mention the holes and ways to avoid them. The warnings are ignored with comments like "that 'never' happen in real life" Eventually the things that "will 'never' happen" happen An emergency team design review for a broken project. So what do I do? Copping the "I told you so" attitude is not going to win friends and influence people. Sometimes years go by and the comments from step 3 are forgotten anyway. I definitely don't want to be the annoying pest reminding the world of the gotchas. I often sit back and watch the Titanic sail off to Europe. It's frustrating to see bad designs move forward. It's also frustrating that I can't seem to convince others of the pending peril of the current path. I do worst on team meetings where everyone has different ways of understanding different terms. Also, egos tend to win of reason and thought. I'm looking for good tactics to convince groups people to use some new and complicated ideas.

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• Object Factory Design Pattern: Register Creator Functions Using TypeLists and Template Metaprogrammi

  How to register classes for Object Factory using TypeList and Template Metaprogramming

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• Draw contour around object in Opengl

  - by Maciekp

  I need to draw contour around 2d objects in 3d space. I tried drawing lines around object(+points to fill the gap), but due to line width, some part of it(~50%) was covering object. I tried to use stencil buffer, to eliminate this problem, but I got sth like this(contour is green): http://goo.gl/OI5uc (sorry I can't post images, due to my reputation) You can see(where arrow points), that some parts of line are behind object, and some are above. This changes when I move camera, but always there is some part, that is covering it. Here is code, that I use for drawing object: glColorMask(1,1,1,1); std::list<CObjectOnScene*>::iterator objIter=ptr->objects.begin(),objEnd=ptr->objects.end(); int countStencilBit=1; while(objIter!=objEnd) { glColorMask(1,1,1,1); glStencilFunc(GL_ALWAYS,countStencilBit,countStencilBit); glStencilOp(GL_REPLACE,GL_KEEP,GL_REPLACE ); (*objIter)->DrawYourVertices(); glStencilFunc(GL_NOTEQUAL,countStencilBit,countStencilBit); glStencilOp(GL_KEEP,GL_KEEP,GL_REPLACE); (*objIter)->DrawYourBorder(); ++objIter; ++countStencilBit; } I've tried different settings of stencil buffer, but always I was getting sth like that. Here is question: 1.Am I setting stencil buffer wrong? 2. Are there any other simple ways to create contour on such objects? Thanks in advance. EDIT: 1. I don't have normals of objects. 2. Object can be concave. 3. I can't use shaders(see below why).

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• How to loop through a javascript object and check each key exists in a separate multidimensional object

  - by Paul Atkins

  I have 2 javascript objects and I am trying to loop through one object and check whether the key exists in a second multidimensional object going one level deeper each time. Here are the two objects var check = {'scope':'instance', 'item':'body', 'property': 'background'}; var values = {'instance': {'body' : {'background': '000000'}}}; b.map(check, function(key){ console.log(values[key]); }); How am I able to check 1 level deeper in the values object each time? What I am trying to do is check the values object as follows: 1st values['instance'] 2nd values['instance']['body'] 3rd values['instance']['body']['background'] Thanks

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• Server error at large posts

  - by Shirko

  On a large drupal site, the database server is on a separate server connected directly to the web server. The web server uses apache and memcached. The problem is that whenever the post is a large, say larger than 10KB, the server does not return correctly. I checked both apache and mysql logs but could not find any trace of errors being logged. The error happens also when I use nginx/php5-fpm instead of apache. Despite this, the large posts are registered, however incorrectly so that they show up for admin when I open a new page on the site. I'm really confused and appreciate your hints to pinpoint the possible sources if this chronic problem.

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• Viewport.Unproject - Checking if a model intersects a large sprite

  - by Fibericon

  Let's say I have a sprite, drawn like this: spriteBatch.Draw(levelCannons[i].texture, levelCannons[i].position, null, alpha, levelCannons[i].rotation, Vector2.Zero, scale, SpriteEffects.None, 0); Picture levelCannon as being a laser beam that goes across the entire screen. I need to see if my 3d model intersects with the screen space inhabited by the sprite. I managed to dig up Viewport.Unproject, but that seems to only be useful when dealing with a single point in 2d space, rather than an area. What can I do in my case?

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• Speed up your Silverlight Debugging for large projects

  - by Aligned

  I'm working on a 5+ year old ASP.NET project that has 74+ projects and we've been adding new Silverlight applications to run in the ASP.NET page islands. My machine at work isn't the most powerful, so I find myself waiting a lot for the whole thing to build. I'm using Visual Studio 2010, so that takes up a lot of resources as well. This causes me to get distracted and I start looking at the news... I need to combat that more :-). I can't get a new machine, that's up to someone else, so I've found a few tricks to help. 1. Only build the Silverlight project you're working with. This will build all referenced projects (you can see these by right clicking and clicking Project Dependencies) and package a new XAP (you can see all the actions in your output build window). Then refresh your page with the Silverlight app and it's up-to-date. 2. I was working with a co-worker (thanks Jordan) who was using the the Debug -> attach to processes window. In the Attach to: row there is a "Select..." button. In the dialog, click "Debug these code types:" and select Silverlight. Hit ok. Then all you need to do is find your process (you might need to click the refresh button). I'm usually debugging in IE, so I select the first one and push "i" on the keyboard. That brings me to the IE windows open. Find the one with type of Silverlight, x86. It is usually directly above one with type of x86 that has the page title for "title". Click attach and watch your output window spit out messages about loading debug symbols and your breakpoints enabled (if this doesn't happen you chose the wrong process, hit stop and try again). Now you can debug the client code as normal, server code requires a full F5 or attaching to the correct process. To improve this even further, bind the menu item to a key stroke. I chose ctrl + x, x. (Tools -> Options -> Keyboard, search for Debug.AttachToProcess, set the shortcut keys globaly and assign). Most of the time I build the project, then hit ctrl + x, x then i, then enter and I'm debugging. The process I want is usually the first IE in the list.

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• Creating Objects

  - by user1424667

  I have a general coding standard question. Is it bad practice to initialize and create an object in multiple methods depending on the outcome of a users choice. So for example if the user quits a poker game, create the poker hand with the cards the user has received, even if < 5, and if the user played till the end create object to show completed hand to show outcome of the game. The key is that the object will only be created once in actuality, there are just different paths and parameters is will receive depending on if the user folded, or played on to the showdown.

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• Large uploaded file won't display in Ubuntu One but is included in file usage

  - by user1488963

  On Ubuntu 10.04, I uploaded a single 711 MB. My total file usage in Ubuntu One went up to 877MB, which is about right, but the file doesn't show in Ubuntu One so I can't download or delete it. Either the file is there and I can't see it for some reason. Or the file is not there and the total file usage figure is wrong. Does anyone know what has happened? I have a free account but am well below my 5GB limit.

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• Determining Object Access Using SQL Server Profiler

  Deanna Dicken examines an SQL Server Profiler event to determine object access...who is using the object, when, and how. This gives the SQL developer or database administrator much needed information for impact analysis prior to a change or the decommissioning of a SQL Server object.

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• OO Software Architecture - base class that everything inherits from. Bad/good idea?

  - by ale

  I am reviewing a proposed OO software architecture that looks like this: Base Foo Something Bar SomethingElse Where Base is a static class. My immediate thought was that every object in any class will inherit all the methods in Base which would create a large object. Could this cause problems for a large system? The whole architecture is hierarchical.. the 'tree' is much bigger than this really. Does this sort of architecture have a name (hierarchical?!). What are the known pros and cons?

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