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• Programmer performance

  - by RSK

  I am a PHP programmer with 1 year of experience. As I am just starting my career, I am learning a lot of things now. I can say I am a little bit of a perfectionist. When I am assigned a problem I start off by Googling. Then, even when I find a solution, I keep trying for a better one until I find 2-3 options. Then I start learning it and choose the best performing solution. Even though I am learning a lot, this process gets me labeled as a low performer. My questions: As a novice, should I continue to use this learning process and not worry about my performance? Should I focus more on my performance and less on how the code performs?

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• Why is HTML/Javascript minification beneficial

  - by Channel72

  Why is HTML/Javascript minification beneficial when the HTTP protocol already supports gzip data compression? I realize that Javascript/HTML minification has the potential to significantly reduce the size of Javascript/HTML files by removing unnecessary whitespace, and perhaps renaming variables to a few letters each, but doesn't the LZW algorithm do especially well when there are many repeated characters (e.g. lots of whitespace?) I realize that some Javascript minification tools do more than just reduce size. Google's closure compiler, for example, also tries to improve code performance by inlining functions and doing other analyses. But the primary purpose of Javascript minification is usually to reduce file size. I also realize there are other reasons you might want to minify aside from performace, such as code obfuscation. But again, that reason is not usually emphasized as much as performance gain and file size reduction. For example, Closure Compiler is not advertised as an obfuscation tool, but as a code size reducer and download-speed enhancer. So, how much performance do you really gain from Javascript/HTML minification when you're already significantly reducing file size with gzip compression?

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• storing map template in database

  - by Timigen

  I am working on an application that displays choropleth maps. These maps are of all different types, some display state by county, country by state/province, or world by country. How should I handle storing the map information in the database? My Thoughts: I won't need to do queries to find POI inside a region, so I don't think there is a need to use spatial datatypes. I am considering storing a map as a geoJSON object (I am using JS mapping library that accepts geoJSON). The only issue is what if I want a map of the US northeast. Then I would have geoJSON for the US and a separate one for the US northeast, which would be redundant. Would it make sense to have a shape database where I had each state then when I needed a map of the US I could query for each state, and when I needed a map of the US Northeast I could again query for what I need? Note: I am not concerned with storing the data for each region, just the region itself. I will query for the data on the fly for the specific region.

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• clear explanation sought: throw() and stack unwinding

  - by Jerry Gagelman

  I'm not a programmer but have learned a lot watching others. I am writing wrapper classes to simplify things with a really technical API that I'm working with. Its routines return error codes, and I have a function that converts those to strings: static const char* LibErrString(int errno); For uniformity I decided to have member of my classes throw an exception when an error is encountered. I created a class: struct MyExcept : public std::exception { const char* errstr_; const char* what() const throw() {return errstr_;} MyExcept(const char* errstr) : errstr_(errstr) {} }; Then, in one of my classes: class Foo { public: void bar() { int err = SomeAPIRoutine(...); if (err != SUCCESS) throw MyExcept(LibErrString(err)); // otherwise... } }; The whole thing works perfectly: if SomeAPIRoutine returns an error, a try-catch block around the call to Foo::bar catches a standard exception with the correct error string in what(). Then I wanted the member to give more information: void Foo::bar() { char adieu[128]; int err = SomeAPIRoutine(...); if (err != SUCCESS) { std::strcpy(adieu,"In Foo::bar... "); std::strcat(adieu,LibErrString(err)); throw MyExcept((const char*)adieu); } // otherwise... } However, when SomeAPIRoutine returns an error, the what() string returned by the exception contains only garbage. It occurred to me that the problem could be due to adieu going out of scope once the throw is called. I changed the code by moving adieu out of the member definition and making it an attribute of the class Foo. After this, the whole thing worked perfectly: a try-call block around a call to Foo::bar that catches an exception has the correct (expanded) string in what(). Finally, my question: what exactly is popped off the stack (in sequence) when the exception is thrown in the if-block when the stack "unwinds?" As I mentioned above, I'm a mathematician, not a programmer. I could use a really lucid explanation of what goes onto the stack (in sequence) when this C++ gets converted into running machine code.

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• Is this overkill? Using MDX queries and cubes instead of SQL stored procedures

  - by Jason Holland

  I am new to Microsoft's SQL Server Analysis Services Cubes and MDX queries. Where I work we have a daily sales table in SQL Server 2005 that already contains an aggregate of sale information per store per day. At this time it contains only 164,000+ rows. We have a sales cube dedicated to this table that about 15 reports are based off of. Now, I should also note that we generate reports based on our own fiscal year criteria: a 13 period year (1 month equals 28 days etc.). Is this overkill? At what point is it justified to begin using SSAS Cubes/MDX over plain old SQL Server stored procedures? Since I have always been just using plain old SQL am I tragically late to the MDX party?

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• What groupware/project-management apps (preferably self-hosted webapp) do you recommend for a small dev shop?

  - by HedgeMage

  I run a small Drupal consulting shop and we've been trying different groupware solutions for what seems like ages, yet nothing we've found seems to be a good fit. We don't need CRM-overkill such as SugarCRM offers -- it's just too much for our small size. We do need git integration (at a minimum, an easy way to associate commits with issues) Time tracking on configurable or 15m increments per-project issue tracking billing (incl. recurring billing for support contracts, etc) some sort of per-project notes/wiki for things like login credentials, client contact info, etc. Contact logging (Client foo called at 2:20pm and asked to add bar to the spec, signed addendum with pricing due to client NLT CoB today, to be returned by CoB tomorrow) Open source solutions are greatly preferred to closed ones Most of all, it should be very efficient to use. Several solutions just fell out of use here because they required too many clicks for simple, frequent tasks like logging time spent on an issue or noting a call from a client. It shouldn't take 20 minutes to make a note. Edit: I almost forgot to mention: we're a mixed Linux/Mac shop with no Windows users.

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• Building websites, which is the better approach MVP or MVC?

  - by Nick

  I'm looking for feedback on MVP and MVC patterns used as basis to build a website. I've used both with a certain degrees of success and failure. Furthermore I've worked in places which have miserable implement MVP across the web, desktop and services layers. I've also seen a few terrible MVC implementations. One thing I've noticed is the MVP stuff-up appear terrible for maintenance or adding any new features compared to the MVC debacles.

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• Formalizing a requirements spec written in narrative English

  - by ProfK

  I have a fairly technical functionality requirements spec, expressed in English prose, produced by my project manager. It is structured as a collection of UI tabs, where the requirements for each tab are expressed as a lit of UI fields and a list of business rules for the tab. Most business rules are for UI fields on a tab, e.g: a) Must be alphanumeric, max length 20. b) Must be a dropdown, with values from table x. c) Is mandatory. d) Is mandatory under certain conditions, e.g. another field is just populated, or has a specific value. Then other business rules get a little more complex. The spec is for a job application, so the central business object (table) is the Applicant, and we have several other tables with one-to-many relationships with applicant, such as Degree, HighSchool, PreviousEmployer, Diploma, etc. e) One such complex rule says a status field can only be assigned a certain value if a many-side record exists in at least one of the many-side tables. E.g. the Applicant has at least one HighSchool or at least one Diploma record. I am looking for advice on how to codify these requirements into a more structured specification defined in terms of tables, fields, and relationships, especially for the conditional rules for fields and for the presence of related records. Any suggestions and advice will be most welcome, but I would be overjoyed if i could find an already defined system or structure for expressing things like this.

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• Business Objects - Containers or functional?

  - by Walter

  This is a question I asked a while back on SO, but it may get discussed better here... Where I work, we've gone back and forth on this subject a number of times and are looking for a sanity check. Here's the question: Should Business Objects be data containers (more like DTOs) or should they also contain logic that can perform some functionality on that object. Example - Take a customer object, it probably contains some common properties (Name, Id, etc), should that customer object also include functions (Save, Calc, etc.)? One line of reasoning says separate the object from the functionality (single responsibility principal) and put the functionality in a Business Logic layer or object. The other line of reasoning says, no, if I have a customer object I just want to call Customer.Save and be done with it. Why do I need to know about another class to save a customer if I'm consuming the object? Our last two projects have had the objects separated from the functionality, but the debate has been raised again on a new project. Which makes more sense and why??

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• Programming logic to group a users activities like Facebook

  - by Chris Dowdeswell

  So I am trying to develop an activity feed for my site. Basically If I UNION a bunch of activities into a feed I would end up with something like the following. Chris is now friends with Mark Chris is now friends with Dave What I want though is a neater way of grouping these similar posts so the feed doesn't give information overload... E.g. Chris is now friends with Mark, Dave and 4 Others Any ideas on how I can approach this logically? I am using Classic ASP on SQL server. Here is the UNION statement I have so far: SELECT U.UserID As UserID, L.UN As UN,Left(U.UID,13) As ProfilePic,U.Fname + ' ' + U.Sname As FullName, 'said ' + WP.Post AS Activity, WP.Ctime FROM Users AS U LEFT JOIN Logins L ON L.userID = U.UserID LEFT OUTER JOIN WallPosts AS WP ON WP.userID = U.userID WHERE WP.Ctime IS NOT NULL UNION SELECT U.UserID As UserID, L.UN As UN,Left(U.UID,13) As ProfilePic,U.Fname + ' ' + U.Sname As FullName, 'commented ' + C.Comment AS Activity, C.Ctime FROM Users AS U LEFT JOIN Logins L ON L.userID = U.UserID LEFT OUTER JOIN Comments AS C ON C.UserID = U.userID WHERE C.Ctime IS NOT NULL UNION SELECT U.UserID As UserID, L.UN As UN,Left(U.UID,13) As ProfilePic, U.Fname + ' ' + U.Sname As FullName, 'connected with <a href="/profile.asp?un='+(SELECT Logins.un FROM Logins WHERE Logins.userID = Cn.ToUserID)+'">' + (SELECT Users.Fname + ' ' + Users.Sname FROM Users WHERE userID = Cn.ToUserID) + '</a>' AS Activity, Cn.Ctime FROM Users AS U LEFT JOIN Logins L ON L.userID = U.UserID LEFT OUTER JOIN Connections AS Cn ON Cn.UserID = U.userID WHERE CN.Ctime IS NOT NULL

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• Networking Programs Suitable For Symbolic Testing

  - by Milen

  Symbolic execution has been successfully used to test programs and automatically generate test cases. I've been working on my master's thesis that allows the testing of arbitrary networked programs (i.e., those communicating via sockets). Now that we have a working symbolic execution engine that has support for sockets, we're looking for real-world pieces of software to test. Our engine has an important restriction (at the moment): it cannot execute multi-threaded programs. So, we're looking for programs that satisfy the criteria outlined below: Written in C Communicates via sockets (TCP / UDP are supported) Does not rely on the filesystem to get the "job" done Runs on Linux Does not use multi-threading Source is available (so that we can compile them to LLVM bytecode) Most programs that would fall under the criteria would probably be implementations of distributed protocols solving a particular problem (e.g., consensus). Any suggestions are greatly appreciated.

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• Regular Expression HTML tags

  - by user134615

  I'd like to know whether it exists a way to put the following HTML tags in a regex. What I want is a regex that can match all the start tags with their corresponding closing tags. E.g., Hello There might be more tags inside. I had thought of something like this: ^<([a-z]+)([^<]+)(?:(.)</\1|\s+/)$/, but it wont work. Sorry if this question doesnt belong to this section. Thank you.

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• What is the best strategy for transforming unicode strings into filenames?

  - by David Cowden

  I have a bunch (thousands) of resources in an RDF/XML file. I am writing a certain subset of the resources to files -- one file for each, and I'm using the resource's title property as the file name. However, the titles are every day article, website, and blog post titles, so they contain characters unsafe for a URI (the necessary step for constructing a valid file path). I know of the Jersey UriBuilder but I can't quite get it to work for my needs as I detailed in a different question on SO. Some possibilities I have considered are: Since each resource should also have an associated URL, I could try to use the name of the file on the server. The down side of this is sometimes people don't name their content logically and I think the title of an article better reflects the content that will be in each text file. Construct a white list of valid characters and parse the string myself defining substitutions for unsafe characters. The downside of this is the result could be just as unreadable as the former solution because presumably the content creators went through a similar process when placing the files on their server. Choose a more generic naming scheme, place the title in the text file along with the other attributes, and tell my boss to live with it. So my question here is, what methods work well for dealing with a scenario where you need to construct file names out of strings with potentially unsafe characters? Is there a solution that better fills out my constraints?

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• A good software development book [closed]

  - by Mahmoud Hossam

  I've searched this website, as well as SO for a question like that, and I still haven't found what I'm looking for. I'm looking for a book that is similar to Head First Software Development. I want to know more about the different stages of software development, I know about coding already, but I don't know much about unit testing, version control, integration, design...etc. P.S. it'd be nice if the book wasn't a thousand pages long. Edit: I'm looking for an introductory text, not a book about the latest trends in software development.

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• Java code generation from class diagram

  - by Sanjay

  I'm on the way developing a Java application where user can provide a class diagram and get the corresponding Java code. I don't know how can I let the user interactively draw a class diagram in Java. I am currently getting the required parameters like attributes, functions directly from the user, and then I render a class diagram for him. I show the class diagram on a jdialog. Is there a better way to do this? This is an example of a class diagram, I need to generate this from a Java program, given the values and relationship.

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• How does a website latency simulator work

  - by nighthawk457

  Sites like webpagetest allow users to enter a website url and a test location, to run a speed test on the site from multiple locations using real browsers. Can anyone give me a basic idea of how sites like this work? You also have plugin's like Aptimize latency simulator or charles web debugging proxy app, that simulate the delay while accessing a site from different locations. I am assuming since these are plugin's these function in a different way. How do these plugin's work ?

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• When is type testing OK?

  - by svidgen

  Assuming a language with some inherent type safety (e.g., not JavaScript): Given a method that accepts a SuperType, we know that in most cases wherein we might be tempted to perform type testing to pick an action: public void DoSomethingTo(SuperType o) { if (o isa SubTypeA) { o.doSomethingA() } else { o.doSomethingB(); } } We should usually, if not always, create a single, overridable method on the SuperType and do this: public void DoSomethingTo(SuperType o) { o.doSomething(); } ... wherein each subtype is given its own doSomething() implementation. The rest of our application can then be appropriately ignorant of whether any given SuperType is really a SubTypeA or a SubTypeB. Wonderful. But, we're still given is a-like operations in most, if not all, type-safe languages. And that seems suggests a potential need for explicit type testing. So, in what situations, if any, should we or must we perform explicit type testing? Forgive my absent mindedness or lack of creativity. I know I've done it before; but, it was honestly so long ago I can't remember if what I did was good! And in recent memory, I don't think I've encountered a need to test types outside my cowboy JavaScript.

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• Always keep files updated in Eclipse

  - by AK01

  I keep lots of files/editors open in Eclipse. I also love using git stash and other git commands that essentially change the contents of my open files. Is there an Eclipse feature or plugin that will always keep the contents of my open files up to date and live? Currently if I put focus in an out of sync editor, I get an awkwardly worded dialog that I have to parse carefully every time. I wish it would just keep me synced like Textmate does.

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• Advice on selecting programming languages to concentrate on? (2nd year IT security student)

  - by Tyler J Fisher

  I'm in the process of considering which programming languages I should devote the majority of my coding studies to. I'm a 2nd year CS student, majoring in IT security. What I want to do/work with: Intelligence gathering Relational databases Virus design Snort network IPS Current coding experience (what I'm going to keep): Java - intermediate HTML5 - intermediate SQL (MySQL, Oracle 11g) - basic BASH - basic I'm going to need to learn (at least) one of the following languages in order to be successful in my field. Languages to add (at least 1): Ruby (+Metasploit) C++ (virus design, low-level driver interaction, computationally intensive applications) Python (import ALL the things) My dilemma: If I diversify too broadly, I won't be able to focus on, and improve in a specific niche. Does anyone have any advice as to how I should select a language? What I'm considering + why I'm leaning towards Ruby because of Metasploit support, despite lower efficiency when compared to Python. Any suggestions based on real-world experience? Should I focus on Ruby, Python, or C++? Both Ruby, and Python have been regarded as syntactically similar to Java which my degree is based around. I'm going to be studying C++ in two years as a component of my malicious code class. Thanks, Tyler

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• Any experience on open source database synchronization open source solutions? [on hold]

  - by Boris Pavlovic

  I'm considering few database synchronization open source solutions. The system in need for data synchronization is composed of instances of different types of databases, i.e. heterogeneous system. There are few candidates: Symmetric DS Talend's Data Integration with support for data synchronization Continuent's Tungsteen Replication Daffodil Replicator OS Do you have any real world experience with any of these tools?

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• Why is TDD not working here?

  - by TobiMcNamobi

  I want to write a class A that has a method calculate(<params>). That method should calculate a value using database data. So I wrote a class Test_A for unit testing (TDD). The database access is done using another class which I have mocked with a class, let's call it Accessor_Mockup. Now, the TDD cycle requires me to add a test that fails and make the simplest changes to A so that the test passes. So I add data to Accessor_Mockup and call A.calculate with appropriate parameters. But why should A use the accessor class at all? It would be simpler (!) if the class just "knows" the values it could retrieve from the database. For every test I write I could introduce such a new value (or an if-branch or whatever). But wait ... TDD is more. There is the refactoring part. But that sounds to me like "OK, I can do this all with a big if-elseif construct. I could refactor it using a new class ... but instead I make use of the DB accessor and do this in a totally different way. The code will not necessarily look better afterwards but I know I WANT to use the database".

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• What's the best book for coding conventions?

  - by Joschua

  What's the best book about coding conventions (and perhaps design patterns), that you highly recommend (at best code samples in Python, C++ or Java)? It would be good, if the book (or just another) also covers the topics project management and agile software development if appropriate (for example how projects fail through spaghetti code). I will accept the answer with the book(s) (maximum two books per answer, please), that looks the most interesting, because the reading might take a while :)

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• Forking a dual licensed app: How to license on my end?

  - by TheLQ

  I forked a project that was dual licensed under the GPL and a commercial license. Since my code was open source and the GPL being what it is, I started by releasing my app under the GPL. But now I'm thinking about dual licensing the project and can't figure out what to do. Since I have copyright on a majority of the code (most of the code was either rewritten or new), can I just pick a commercial license or do I have to buy the upstream commercial license since I'm technically a "derivative" of the project?

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• Version Control without CVS

  - by Lo Wai Lun

  My partners and I have been building an application that requires users to authenticate with password and user ID for member registration and transaction. Very often, tasks for designing UI, Datagrid view event trigger and data access using SQL are allocated to different person. Sometimes, there are different versions to be updated but the database structure used are different If everybody finishes their own part and submit the project on their own onto the shared cloud rivers, there must be a huge cost for software maintenance and re-engineering. How should the task to be submitted so as to minimize the cost for re-engineering without the software like winCVS and Tortoise HG?

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• What are the most important OO skills to show off in the job hunt?

  - by Kat

  I am in the market for new employment, and found a position were they asked me to create a programming sample based off an assignment. I blew the sample trying to get it done quickly one night, and got declined - only to be given a second chance recently. The concern was that I didn't really demonstrate object oriented knowledge. I've rethought my approach but I figure it's worth asking: if you were hiring someone for an OO position, what skills would you most want to see them demonstrate they had a firm grasp on? I want to be sure that I'm missing anything important this time around.

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