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  • Effective versus efficient code

    - by Todd Williamson
    TL;DR: Quick and dirty code, or "correct" (insert your definition of this term) code? There is often a tension between "efficient" and "effective" in software development. "Efficient" often means code that is "correct" from the point of view of adhering to standards, using widely-accepted patterns/approaches for structures, regardless of project size, budget, etc. "Effective" is not about being "right", but about getting things done. This often results in code that falls outside the bounds of commonly accepted "correct" standards, usage, etc. Usually the people paying for the development effort have dictated ahead of time what it is that they value more. An organization that lives in a technical space will tend towards the efficient end, others will tend towards the effective. Developers often refuse to compromise their favored approach for the other. In my own experience I have found that people with formal education in software development tend towards the Efficient camp. Those that picked up software development more or less as a tool to get things done tend towards the Effective camp. These camps don't get along very well. When managing a team of developers who are not all in one camp it is challenging. In your own experience, which camp do you land in, and do you find yourself having to justify your approach to others? To management? To other developers?

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  • kill SIGABRT does not generate core file from daemon started from crontab. [closed]

    - by Guma
    I am running CentOS 5.5 and working on server application that sometimes I need to force core dump so I can see what is going on. If I start my server from shell and send kill SIGABRT, core file is created. If I start same program from crontab and than I send same signal to it server is "killed" but not core file is generated. Does any one know why is that and what need to be added to my code or changed in system settings to allow core file generation? Just a side note I have ulimit set to unlimited in /etc/profile I have set kernel.core_uses_pid = 1 kernel.core_pattern=/var/cores/%h-%e-%p.core in /etc/sysctl.conf Also my server app was added to crontab under same login id as I am running it from shell. Any help greatly appreciated

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  • from Java to SAS

    - by Giovanni Rossi
    I am a seasoned python,java,...other programmer having a (fairly advanced) mathematical education (so I do understand statistics and data mining, for example) . For various reasons I am thinking to switch to SAS/BI area (I am naming SAS because it might be, for me, a possible way to enter in BI). My question, for whoever might have an experience of both: is it, in BI current state, worth it? I mean, the days of big ideas in BI for business seem to be over (there are the APIs, managers think that they know what you can do with them), and my mathematical background might turn out to be superflous. Also, the big companies now have their data organized, have their BI procedures well established, and trying to analyze it from a different standpoint might not be what they want. Another difference is: while in Java etc. development one codes and codes and codes, I don't know if this is the case for BI; in fact, from what I read on the net, a BI (or OLAP, ...etc) developer, in a big organization, is usually in a state of standby, and does in fact little coding. Any opinions, and in particular strong opinions, will be appreciated.

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  • How to solve SocketException: Permission denied: connect

    - by luxinxian
    I recently encountered a problem getting a headache, need help... System consists of: Two subsystems, called A, B (each running on a standalone tomcat instance), currently running on the same machine. A invoke B's service via spring httpInvoker(http). B system also invoke other system's services via http. Symptoms: 1, the system starts to run normally after 10-15 days; 2, the system will run for a period of time after an exception: org.springframework.remoting.RemoteAccessException: Could not access HTTP invoker remote service at [http://xxx.xxx.xxx.xxx/remoting/call]; nested exception is java. net.SocketException: Permission denied: connect 3, when the exception occour, it continues, not only occasional .(it looks like some resources exhausted, but cpu rate < 5%, memory < 15%, network < 5%) 4, A, B when the system call fails, B system via http call to an external service also failed for the same exception. 5, closed two tomcat services, restart, and working properly. So repeatedly (step 1 - 5), has not found the root reason. Emvironment: windows 2008 R2 tomcat7.0.42 x86_64 oralce-jdk-1.7.0_40 Any ideas?

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  • how to process document state transition?

    - by brick
    Imagine there is an application (ASP.NET MVC) that processes some documents. The document must be revised several times by different group of users. state/role rules: simple user can only publish document; (priority: low) userGroup1 can switch it to next state or reject it; (priority: higher) userGroup2 can confirm previous state and switch it to next gradual state or reject it; (priority: highest) How to implement such a workflow in ASP.NET MVC? How to impelement UI, views so that group with lower priority can both visually/technically perform only allowed transitions? Can I somehow extend that system: link? Do I need extras like service bus, event sourcing for that?

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  • How do you go about understanding the source code of an Open source project?

    - by Anirudh Vemula
    I am planning to contribute code through patches to some open source organisations to become more aware of open source development. I have chosen some organisations but when I download their source code, I don't seem to understand even a bit of it. How do I go about understanding their source code? I tried going through resolving a bug but finding the place in the source code where the bug is present is also difficult when you have no idea about how the code is structured and implemented. I need help on this so I can start working on an open source code.

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  • Learning and Developing with PHP [closed]

    - by KyelJmD
    I am here to ask you What is a good PHP Book that doesn't contain too much details but it is compose of all necessary information to develop in PHP such as (OO PHP, Handling Forms, Database etc etc) This may be subjective but I've tried to look php book recomendations here at Stackoverflow but I cannot find any. Next is What are the things I need to know in learning a PHp framework? specifically I want to learn CAKEPHP. NOTE I do not need those lenghty books that discuss loops and such I already have experience programming with java and C#.

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  • Nearly technical books that you enjoyed reading

    - by pablo
    I've seen questions about "What books you recommend" in several of the Stack Exchange verticals. Perhaps these two questions (a and b) are the most popular. But, I'd like to ask for recommendations of a different kind of books. I have read in the past "The Passionate Programmer" and I am now reading "Coders at Work". Both of them I would argue that are almost a biography (or biographies in the "Coders at work") or even a bit of "self-help" book (that is more the case of the "Passionate programmer"). And please don't get me wrong. I loved reading the first one, and I am loving reading the second one. There's a lot of value in it, mostly in "lessons of the trade" kind of way. So, here is what I'd like to know. What other books that you read that are similar to these ones in intent that you enjoyed? Why?

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  • What are the legal considerations when forking a BSD-licensed project?

    - by Thomas Owens
    I'm interested in forking a project released under a two-clause BSD license: Copyright (c) 2010 {copyright holder} All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: (1) Redistributions of source code must retain the above copyright notice, this list of conditions and the disclaimer at the end. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. (2) Neither the name of {copyright holder} nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. DISCLAIMER THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. I've never forked a project before, but this project is very similar to something that I need/want. However, I'm not sure how far I'll get, so my plan is to pull the latest from their repository and start working. Maybe, eventually, I'll get it to where I want it, and be able to release it. Is this the right approach? How, exactly, does this impact forking of the project? How do I track who owns what components or sections (what's copyright me, what's copyright the original creators, once I start stomping over their code base)? Can I fork this project? What must I do prior to releasing, and when/if I decide to release the software derived from this BSD-licensed work?

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  • Understanding Visitor Pattern

    - by Nezreli
    I have a hierarchy of classes that represents GUI controls. Something like this: Control-ContainerControl-Form I have to implement a series of algoritms that work with objects doing various stuff and I'm thinking that Visitor pattern would be the cleanest solution. Let take for example an algorithm which creates a Xml representaion of a hierarchy of objects. Using 'classic' approach I would do this: public abstract class Control { public virtual XmlElement ToXML(XmlDocument document) { XmlElement xml = document.CreateElement(this.GetType().Name); // Create element, fill it with attributes declared with control return xml; } } public abstract class ContainerControl : Control { public override XmlElement ToXML(XmlDocument document) { XmlElement xml = base.ToXML(document); // Use forech to fill XmlElement with child XmlElements return xml; } } public class Form : ContainerControl { public override XmlElement ToXML(XmlDocument document) { XmlElement xml = base.ToXML(document); // Fill remaining elements declared in Form class return xml; } } But I'm not sure how to do this with visitor pattern. This is the basic implementation: public class ToXmlVisitor : IVisitor { public void Visit(Form form) { } } Since even the abstract classes help with implementation I'm not sure how to do that properly in ToXmlVisitor. Perhaps there is a better solution to this problem. The reason that I'm considering Visitor pattern is that some algorithms will need references not available in project where the classes are implemented and there is a number of different algorithms so I'm avoiding large classes. Any thoughts are welcome.

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  • What version control system can manage all aspects?

    - by Andy Canfield
    A few months ago I dug into Subversion and GIT and was disappointed. They handle SOURCE CODE fine but not other aspects. For example, a web site under version control needs to manage file/directory ownership, file/directory read & write access, Access Control Lists, timestamps, database contents. and external links. Is there a version control system that can do as perfect a reversion as reloading from a month-old backup?

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  • Software development life cycle in the industry

    - by jiewmeng
    I am taking a module called "Requirements Analysis & Design" in a local university. Common module, I'd say (on software development life cycle (SDLC) and UML). But there is a lot of things I wonder if they are actually (strictly) practiced in the industry. For example, will a domain class diagram, an not anything extra (from design class), be strictly the output from Analysis or Discovery phase? I'm sure many times you will think a bit about the technical implementation too? Else you might end up with a design class diagram later that is very different from the original domain class diagram? I also find it hard to remember what diagrams are from Initiation, Discovery, Design etc etc. Plus these phases vary from SDLC to SDLC, I believe? So I usually will create a diagram when I think will be useful. Is it the wrong way?

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  • Can an agile shop every really score 12 on the Joel Test? [closed]

    - by Simon
    Possible Duplicate: Can an agile shop every really score 12 on the Joel Test? I really like the Joel test, use it myself, and encourage my staff and interviewees to consider it carefully. However I don't think I can ever score more than 9 because a few points seem to contradict the Agile Manifesto, XP and TDD, which are the bedrocks of my world. Specifically the questions about schedule, specs, testers and quiet working conditions run counter to what we are trying to create and the values that we have adopted in being genuinely agile. So my question is whether it is possible for a true Agile shop to score 12? [Note: I had this question closed on meta so I have re-posted here]

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  • How to publicize new Android's HTTP requests library

    - by Yaniv
    I don't know if this really belongs here, but I developed an open-source HTTP requests library for Android called Unite. This library was built mainly to significantly facilitate the work and coding time, and makes it easy to create and work with HTTP requests. I think a big advantage of this library is that it is open-source, so everyone can contribute to make it even better. I started this project for personal use, and I really like the result. What is the right and proper way to publicize the project, I do think it will be handy to Android developers. So how can I make developers know this library exist?

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  • export web page data to excel using javascript [on hold]

    - by Sreevani sri
    I have created web page using html.When i clicked on submit button it will export to excel. using javascript i wnt to export thadt data to excel. my html code is 1. Please give your Name:<input type="text" name="Name" /><br /> 2. Area where you reside:<input type="text" name="Res" /><br /> 3. Specify your age group<br /> (a)15-25<input type="text" name="age" /> (b)26-35<input type="text" name="age" /> (c)36-45<input type="text" name="age" /> (d) Above 46<input type="text" name="age" /><br /> 4. Specify your occupation<br /> (a) Student<input type="checkbox" name="occ" value="student" /> (b) Home maker<input type="checkbox" name="occ" value="home" /> (c) Employee<input type="checkbox" name="occ" value="emp" /> (d) Businesswoman <input type="checkbox" name="occ" value="buss" /> (e) Retired<input type="checkbox" name="occ" value="retired" /> (f) others (please specify)<input type="text" name="others" /><br /> 5. Specify the nature of your family<br /> (a) Joint family<input type="checkbox" name="family" value="jfamily" /> (b) Nuclear family<input type="checkbox" name="family" value="nfamily" /><br /> 6. Please give the Number of female members in your family and their average age approximately<br /> Members Age 1 2 3 4 5<br /> 8. Please give your highest level of education (a)SSC or below<input type="checkbox" name="edu" value="ssc" /> (b) Intermediate<input type="checkbox" name="edu" value="int" /> (c) Diploma <input type="checkbox" name="edu" value="dip" /> (d)UG degree <input type="checkbox" name="edu" value="deg" /> (e) PG <input type="checkbox" name="edu" value="pg" /> (g) Doctorial degree<input type="checkbox" name="edu" value="doc" /><br /> 9. Specify your monthly income approximately in RS <input type="text" name="income" /><br /> 10. Specify your time spent in making a purchase decision at the outlet<br /> (a)0-15 min <input type="checkbox" name="dis" value="0-15 min" /> (b)16-30 min <input type="checkbox" name="dis" value="16-30 min" /> (c) 30-45 min<input type="checkbox" name="dis" value="30-45 min" /> (d) 46-60 min<input type="checkbox" name="dis" value="46-60 min" /><br /> <input type="submit" onclick="exportToExcel()" value="Submit" /> </div> </form>

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  • Is there an appropriate coding style for implementing an algorithm during an interview?

    - by GlenPeterson
    I failed an interview question in C years ago about converting hex to decimal by not exploiting the ASCII table if (inputDigitByte > 9) hex = inputDigitByte - 'a'. The rise of Unicode has made this question pretty silly, but the point was that the interviewer valued raw execution speed above readability and error handling. They tell you to review algorithms textbooks to prepare for these interviews, yet these same textbooks tend to favor the implementation with the fewest lines of code, even if it has to rely on magic numbers (like "infinity") and a slower, more memory-intensive implementation (like a linked list instead of an array) to do that. I don't know what is right. Coding an algorithm within the space of an interview has at least 3 constraints: time to code, elegance/readability, and efficiency of execution. What trade-offs are appropriate for interview code? How much do you follow the textbook definition of an algorithm? Is it better to eliminate recursion, unroll loops, and use arrays for efficiency? Or is it better to use recursion and special values like "infinity" or Integer.MAX_VALUE to reduce the number of lines of code needed to write the algorithm? Interface: Make a very self-contained, bullet-proof interface, or sloppy and fast? On the one extreme, the array to be sorted might be a public static variable. On the other extreme, it might need to be passed to each method, allowing methods to be called individually from different threads for different purposes. Is it appropriate to use a linked-list data structure for items that are traversed in one direction vs. using arrays and doubling the size when the array is full? Implementing a singly-linked list during the interview is often much faster to code and easier remember for recursive algorithms like MergeSort. Thread safety - just document that it's unsafe, or say so verbally? How much should the interviewee be looking for opportunities for parallel processing? Is bit shifting appropriate? x / 2 or x >> 1 Polymorphism, type safety, and generics? Comments? Variable and method names: qs(a, p, q, r) vs: quickSort(theArray, minIdx, partIdx, maxIdx) How much should you use existing APIs? Obviously you can't use a java.util.HashMap to implement a hash-table, but what about using a java.util.List to accumulate your sorted results? Are there any guiding principals that would answer these and other questions, or is the guiding principal to ask the interviewer? Or maybe this should be the basis of a discussion while writing the code? If an interviewer can't or won't answer one of these questions, are there any tips for coaxing the information out of them?

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  • Can HTML injection be a security issue?

    - by tkbx
    I recently came across a website that generates a random adjective, surrounded by a prefix and suffix entered by the user. For example, if the user enters "123" for prefix, and "789" for suffix, it might generate "123Productive789". I've been screwing around with it, and I thought I might try something out: I entered this into the prefix field: <a href="javascript:window.close();">Click</a><hr /> And, sure enough, I was given the link, then an <hr>, then a random adjective. What I'm wondering is, could this be dangerous? There must be many more websites out there that have this issue, are all of them vulnerable to some sort of php injection?

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  • What should one keep in mind when switching from traditional to RESTful routing in Rails?

    - by Brian Holder-Chow
    What should one keep in mind when switching from traditional to RESTful routing in Rails? From a typical Rails routes.rb file: # This is a legacy wild controller route that's not recommended for RESTful applications. # Note: This route will make all actions in every controller accessible via GET requests. match ':controller(/:action(/:id))(.:format)' As switching away from this means that I will have to create routes for each controller individually, does anyone have any advice on the best way to migrate this safely?

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  • Is extensive documentation a code smell?

    - by Griffin
    Every library, open-source project, and SDK/API I've ever come across has come packaged with a (usually large) documentation file, and this seems contradictory to the wide-spread belief that good code needs little to no comments. What separates documentation from this programming methodology? a one to two page overview of a package seems reasonable, but elegant code combined with standard intelisense should have theoretically deprecated the practice of documentation by now IMO. I feel like companies only create detailed documentation and tutorials because its what they've always done. Why should developers have to constantly be searching through online documentation in order to learn how to do things when such information should be intrinsic to the classes, methods and namespaces?

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  • Rule Engine in .net

    - by user641812
    I have to import data from excel to SQL database. Excel data contains various parameters and there value like P1,P1,P4,P5 etc. I have to apply business rules Like if( P1 100 and P1 < 200) then insert the record in database. Similarly in some cases string values are also validated. Can I have any open source rule engine that contains UI to change , add , delete the rules. Am using C# to read the excel and and insert the records One more thing which is best approach: Read excel first and store every record as an object in a collection, then iterate through the collection, apply business rules on every object and then insert record in the database Or Read one record from excel apply business rule and then insert record in the database. Repeat the process for whole excel.

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  • Data binding in web UI frameworks, what's the deal?

    - by c-smile
    I believe that most of modern Web frameworks that pretend to be MVC ones also has a notion of data binding in one form or another. Examples: AngularJS, EmberJS, KnockoutJS, etc. I am assuming that "data binding" is a declarative definition (oxymoron, no?) of live link between data (a.k.a. model) and its representation (a.k.a. view). With some transformers in between (a.k.a. controllers). I understand why declarativeness is kind of appealing but also understand that as usual it comes with the price. In particular: 1. Live binding is quite heavy, either with dirty watch (high CPU consumption) or with Object.observe() (high memory consumption with high CPU load in some scenarios). 2. There is a "frame" part in the framework word, means there are some boundaries/limits that can be hard to overcome if you need slightly more than it was designed for. Quite usual time split: 90% of features are made in 10% of project time. But 10% rest take 90% of project time. I suspect (a.k.a. educated guess) that those MVC things are not helping to implement more functionality in less time... If so their usage motivation is not quite clear. As an example: last week wanted to find virtual list idea/solution. Found one in vanilla JavaScript that is 120 LOC. Implementation of the same but in AngualrJS is about 420 LOC. Most of the code there seems like a fight with the framework itself... So is my question: what benefits that MVC stuff or data binding give us? Is it just a buzzword popular among project managers or they give us something useful. If later one then what exactly?

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  • Data indexing frameworks fit for large E-Commerce applications

    - by Dabu
    we wrote and still maintain a large E-Commerce application. Our feature list resembles what you would expect from most shops. We'd like to improve some of our features, and now the search/suggestion list functionality (enter some letters, a JScripted suggestion list appears) has caught our eye. Currently, we use http://xapian.org/. It has some drawbacks. Firstly, it's not actually the right solution. It has been created to index documents, not ever-changing data in a granularity that an E-Commerce application would need. Secondly, the load on the database is significant when we reindex all data every night. We'd like a framework that has been designed for indexing database data, which can add to the index easily and without much load, which can supply data changes in the backoffice quickly to the frontend without much load and delay. I'm aware of the fact that Xapian is Open Source and even Free Software, so we could adapt it to our needs if we decided to invest the time and manpower. But taking a quick look around for a solution more suited seems fair, right? Oh, and commercial applications are fine, too. FOSS is not required. Thanks a bunch.

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  • Does a programmer really need college?

    - by Dfranc3373
    I am currently a junior in college, however I have had multiple jobs programming since high school. Currently I work programming at a company part time using many different languages that I have learned the past few years. I recently sat down with a advisor and discovered with the classes I have left to take, I will learn next to nothing in them, as I already know the concepts and how to apply them for all the classes. My current job has offered me a full time position and I have had other companies email me as well. My question is if I know for a fact that I cannot learn more at college, is there even a point in staying? I know for a fact I could spend my time in more productive ways programming and working then what I am doing in school. Do you think to be looked at seriously as a programmer you need a degree?

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  • How broad should a computer science/engineering student go?

    - by AskQuestions
    I have less than 2 years of college left and I still don't know what to focus on. But this is not about me, this is about being a future developer. I realize that questions like "Which language should I learn next?" are not really popular, but I think my question is broader than that. I often see people write things like "You have to learn many different things. Being a developer is not about learning one programming language / technology and then doing that for the rest of your life". Well, sure, but it's impossible to really learn everything thoroughly. Does that mean that one should just learn the basics of everything and then learn some things more thoroughly AFTER getting a particular job? I mean, the best way to learn programming is by actually programming stuff... But projects take time. Does an average developer really switch between (for example) being a web developer, doing artificial intelligence and machine learning related stuff and programming close to the hardware? I mean, I know a lot of different things, but I don't feel proficient in any of those things. If I want to find a job as a web developer (that's just an example) after I finish college, shouldn't I do some web related project (maybe using something I still don't know) rather than try to learn functional programming? So, the question is: How broad should a computer science student's field of focus be? One programming language is surely far too narrow, but what is too broad?

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  • How does it matter if a character is 8 bit or 16 bit or 32 bit

    - by vin
    Well, I am reading Programing Windows with MFC, and I came across Unicode and ASCII code characters. I understood the point of using Unicode over ASCII, but what I do not get is how and why is it important to use 8bit/16bit/32bit character? What good does it do to the system? How does the processing of the operating system differ for different bits of character. My question here is, what does it mean to a character when it is a x-bit character?

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