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• Do other developers feel that as they get better, it becomes harder to get jobs?

  - by nbv4

  When I was starting out, it seemed I had a much better time getting interviews and passing them. But now that I'm more experienced, I'm finding that its harder and harder to find a job. Do other developers out there feel the same way? I'll give you an example. I did an interview last Wednesday. It was a small start-up with only one other engineer and the CEO. They flew me in from Ohio (they are SF based). When I got there, they had me write them a link shortener, which took me about 10 minutes to write. I was supposed to be there all day working on this. When I finished it early, the interviewer seemed kind of shocked. After that, we were talking, and I asked him what they use to store data. He told me Mongo. I ask why he decided to use mongo. He then stammered and mumbled his answer, which basically boiled down to "We're using it because Mongo is a the trendy database technology and we don't want to be left out", which I've found is pretty much most common reason people use NoSQL these days. The interviewer quickly ended the interview and pretty much shoved me out the door. I was supposed to have lunch with the CEO, but I he kicked me out before I had a chance. The intervier wasn't mean or rude, (and neither was I). After I got back to Ohio, I got an email from them saying "I wasn't a fit". This sot of thing happens to me all the time. I'm starting to think "not a fit" can sometimes mean "are too high of a skill level that we are". Is this all in my head, or do other experienced developers notice the same thing happening? Back when I used to struggle with coding problems, I would work with the interviewer and it would be a positive thing and I'd get hired. But now I usually blow through the coding part, and the interviewer being left speechless is working against me. Should I feign struggling with coding problems?

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• Fastest way to set up a JSON server on my local machine [closed]

  - by Mohsen

  I am a front-end developer. For many experiements I do I need to have a server that talks JSON with my client side app. Normally that server is a simple server that response to my POSTs and GETs. For example I need to setup a server that saves, modifies and read data from a "library" database like this: POST /books create a book GET /book/:id gets a book and so on... What is the fastest to set up and easiest technology stack for database and server in this case? I am open to use Ruby, Nodejs and anything that do the job fast and easy. Is there any framework (on any language) that do stuff like this for me?

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• SS7(M3UA, SCCP, TCAP, MAP) Stack

  - by Ammar Hameed

  I'm building an open source SMSC from scratch; it's almost finished, The SRI and the forwardSM operations are working, but I still have few things to do for the receiving part. I've built the SS7 stack already, but I'm using DB for saving the TCAP transactions IDs to be updated later to get/generate responses. My approach is this: I created memory table (heap table), saved the TCAP TID in the database, then compared the received TCAP TID with the TIDs saved in the database and then decide whether to end the TCAP session or continue. What is the best way to implement it? I'm thinking of doubly linked list that holds the TCAP TID. Am I going towards the right direction, or should I use another technique other than database or D-linked list? Should I leave it as it is, and let the database do the job for saving the TIDs? Please note that I'm using SCTP implementation available on Linux (lsctp) as a transport protocol, the language I'm using is C and the DB is MYSQL.

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• How to understand Linux kernel source code for a beginner?

  - by user16867

  I am a student interested in working on Memory Management, particularly the page replacement component of the linux kernel. What are the different guides that can help me to begin understanding the kernel source? I have tried to read the book Understanding the Linux Virutal Memory Manager by Mel Gorman and Understanding the Linux Kernel by Cesati and Bovet, but they do not explain the flow of control through the code. They only end up explaining various data structures used and the work various functions perform. This makes the code more confusing. My project deals with tweaking the page replacement algorithm in a mainstream kernel and analyse its performance for a set of workloads. Is there a flavor of the linux kernel that would be easier to understand(if not the linux-2.6.xx kernel)?

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• How to manage many mobile device users at server side?

  - by Rami

  I built a social Android application in which users can see other users around them by GPS location. At the beginning thing went well as I had low number of users, but now that I have increasing number of users (about 1500 +100 every day) it has revealed a major problem in my design. In my Google App Engine servlet I have static HashMap that holds all the users profiles objects, currently 1500 and this number will increase as more users register. Why I'm doing it? Every user that requests for the users around him compares his GPS with other users and checks if they are in his 10km radius. This happens every five minutes on average. Consequently, I can't get the users from db every time because GAE read/write operation quota will tear me apart. The problem with this design is? As the number of users increases, the Hashmap turns to null every 4-6 hours, I think that this time is getting shorter, but I'm not sure. I'm fixing this by reloading the users from the db every time I detect that it becomes null, but this causes DOS to my users for 30 sec, so I'm looking for better solution. I'm guessing that it happens because the size of the hashmap. Am I right? I have been advised to use a spatial database, but that means that I can't work with GAE any more and it means that I need to build my big server all over again and lose my existing DB. Is there something I can do with the existing tools? Thanks.

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• Is Ruby on Rails' Active Record an example of Aspect-Oriented Programming?

  - by B Seven

  From Clean Code, about Cross-Cutting Concerns: Note that concerns like persistence tend to cut across the natural object boundaries of a domain. You want to persist all your objects using generally the same strategy, for example, using a particular DBMS... Is Active Record an example of aspect-oriented programming? In AOP, modular constructs called aspects specify which points in the system should have their behavior modified in some consistent way to support a particular concern. This specification is done using a succinct declarative or programmatic mechanism. If Active Record is an example of AOP, what is the "aspect"? Is it the class declaration that inherits from Active Record? class Foo < ActiveRecord::Base

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• To identify the classes for uml diagrams?

  - by user106535

  I want to implement a software engineering project based on "crime management system". The main modules are: visitors, users, administrator. The main events that are taking place are: registration, report complaint, report crime, report most wanted, view status of reported crime. So could you please help me to identify the classes that are to be used in this project and help me to draw the class diagram?

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• How to charge in agile iterative approach?

  - by user1620696

  I have a doubt about budgeting when working with agile iterative approach. If I understood well, in agile at the end of each iteration we have usable product, so we have some of the requirements met and then some part of the software will be already working. How do we charge for our work in this methodology? Do we charge per iteration, i.e. charge per major requirements being met, or just charge the customer when the software is indeed finished and then receive for everything at once?

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• Should I build a multi-threaded system that handles events from a game and sorts them, independently, into different threads based on priority?

  - by JonathonG

  Can I build a multi-threaded system that handles events from a game and sorts them, independently, into different threads based on priority, and is it a good idea? Here's more info: I am about to begin work on porting a mid-sized game from Flash/AS3 to Java so that I can continue development with multi-threading capabilities. Here's a small bit of background about the game: The game contains numerous asynchronous activities, such as "world updating" (the game environment is constantly changing based on a set of natural laws and forces), procedural generation of terrain, NPCs, quests, items, etc., and on top of that, the effects of all of the player's interactions with his environment are programmatically calculated in real time, based on a set of constantly changing "stats" and once again, natural laws and forces. All of these things going on at once, in an asynchronous manner, seem to lend themselves to multi-threading very well. My question is: Can I build some kind of central engine that handles the "stacking" of all of these events as they are triggered, and dynamically sorts them out amongst the available threads, and would it be a good idea? As an example: Essentially, every time something happens (IE, a magic missile being generated by a spell, or a bunch of plants need to grow to their next stage), instead of just processing that task right then and adding the new object(s) to a list of managed objects, send a reference to that event to a core "event handler" that throws it into a stack of all other currently queued events, which then sorts them out and orders them according to urgency, splits them between a number of available threads for as-fast-as-possible multithreaded execution.

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• What is Pseudocode?

  - by Jae

  I've seen a lot of mentions of Pseudocode lately, on this site and others. But I don't get it: What is Pseudocode? For example, the Wikipedia article below says "It uses the structural conventions of a programming language, but is intended for human reading rather than machine reading." Does this mean that it isn't actually used to make programs? Why is it used? How is it used? Is it considered a Programming Language? See the above Wikipedia quote. Is it commonly known/used? Anything else... I honestly don't know where to start with this. I have Googled it and I've seen the Wikipedia article on the topic, but I still don't fully understand what it is.

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• How granular should a command be in a CQ[R]S model?

  - by Aaronaught

  I'm considering a project to migrate part of our WCF-based SOA over to a service bus model (probably nServiceBus) and using some basic pub-sub to achieve Command-Query Separation. I'm not new to SOA, or even to service bus models, but I confess that until recently my concept of "separation" was limited to run-of-the-mill database mirroring and replication. Still, I'm attracted to the idea because it seems to provide all the benefits of an eventually-consistent system while sidestepping many of the obvious drawbacks (most notably the lack of proper transactional support). I've read a lot on the subject from Udi Dahan who is basically the guru on ESB architectures (at least in the Microsoft world), but one thing he says really puzzles me: As we get larger entities with more fields on them, we also get more actors working with those same entities, and the higher the likelihood that something will touch some attribute of them at any given time, increasing the number of concurrency conflicts. [...] A core element of CQRS is rethinking the design of the user interface to enable us to capture our users’ intent such that making a customer preferred is a different unit of work for the user than indicating that the customer has moved or that they’ve gotten married. Using an Excel-like UI for data changes doesn’t capture intent, as we saw above. -- Udi Dahan, Clarified CQRS From the perspective described in the quotation, it's hard to argue with that logic. But it seems to go against the grain with respect to SOAs. An SOA (and really services in general) are supposed to deal with coarse-grained messages so as to minimize network chatter - among many other benefits. I realize that network chatter is less of an issue when you've got highly-distributed systems with good message queuing and none of the baggage of RPC, but it doesn't seem wise to dismiss the issue entirely. Udi almost seems to be saying that every attribute change (i.e. field update) ought to be its own command, which is hard to imagine in the context of one user potentially updating hundreds or thousands of combined entities and attributes as it often is with a traditional web service. One batch update in SQL Server may take a fraction of a second given a good highly-parameterized query, table-valued parameter or bulk insert to a staging table; processing all of these updates one at a time is slow, slow, slow, and OLTP database hardware is the most expensive of all to scale up/out. Is there some way to reconcile these competing concerns? Am I thinking about it the wrong way? Does this problem have a well-known solution in the CQS/ESB world? If not, then how does one decide what the "right level" of granularity in a Command should be? Is there some "standard" one can use as a starting point - sort of like 3NF in databases - and only deviate when careful profiling suggests a potentially significant performance benefit? Or is this possibly one of those things that, despite several strong opinions being expressed by various experts, is really just a matter of opinion?

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• Rationale behind freeware projects

  - by VexXtreme

  I've seen some freeware projects in the past where the author(s) invested a significant amount of their personal time and resources and never even considered charging for the software. A lot of these projects were donation based, and from what I've heard, donationware can never be a viable business model (even to simply support development costs) because most people choose not to donate if given an option. A lot of these projects eventually shut down because their authors could not sustain them further. Granted, some people simply like making the community happy (or something), but if you're struggling to keep your project alive, why not charge some small amount such as $10 simply to stay operational? If people find your software useful (and a lot of people found those projects VERY useful) they won't have a problem paying such a small amount. The question is: if you have a popular app that people like and download in great numbers, why not put a price tag on it? Why do it for free?

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• How to proceed when a bug in open source libraries is suspected?

  - by Suma

  We are using some open source libraries in our projects. Sometimes there are some issues found in some of them (most likely library bugs, but it may also be a wrong usage from our side, especially when sometimes documentation is not exactly 100 % complete). As the libraries are often quite complex, debugging them to pinpoint the source of the problem is sometimes quite hard. Can you help me to summarize what other options are there and how to exactly proceed with them? I have just recently hit some strange problems when using TCMalloc (Google scalable memory allocator) on Windows, so I would most welcome answers which would apply to this particular library, but more general answers are good as well. 1) Ask the maintainer/owner of the project for assistance. How can this be done? 2) Hire someone to identify and fix the issue. How to do this? How can I find someone with enough expertise in some particular library? ... any other options?

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• Software Usability analysis

  - by Afnan

  i am unable to find the answers to the following questions.Please help me resolve (a) Name quantitative and qualitative techniques for analysing the usability of a software product. (b) Compare the costs and bene?ts of the quantitative techniques. (c) Compare the costs and bene?ts of the qualitative techniques. (d ) If restricted to a single one of these techniques when designing a new online banking system, which would you choose and why?

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• When to update jQuery?

  - by epaulk

  When you recommend updating jQuery/jQuery UI? Or in other words: what are the best practices for updating jQuery/jQuery UI? I’m working on a long project that will take at least one more year. In that time span, I’m sure that jQuery/jQuery UI will be updated many times. Do you recommend update my jQuery/jQuery UI files every time an update is released? Or is better to stick with a particular version until the end of the project? I’m afraid of “breaking” code changes, and every time an update is released, I have to test everything. That takes too much time. But on the other hand, if I didn’t update, I’m afraid of bugs that later will bite me in the rear. The project is an ASP.MVC and I use jQuery a lot. Any thoughts?

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• Is "PHP and MySQL Web Development, 4th ed." an outdated book to learn from?

  - by ForeverLearnNeverMaster

  I want to get into web stuff, and thought of going with PHP+MySQL. I have experience in C#, C++, desktop graphics, but no web stuff besides HTML, CSS which I started learning 2 months ago. On SO PHP-book question, the highest rated book is "PHP Objects, Patterns and Practice". However, I'm not sure if it's a book to start PHP with... or is it? Most of the books mentioned in that SO question seem to be for those who already know PHP. I considered "PHP & MySQL Web Development, 4th Ed.", but someone mentioned that "it uses the mysql_* functions which are almost deprecated." Help?

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• How to design console application with good seperation of UI from Logic

  - by JavaSa

  Is it considered an overkill for console application to be design like MVC , MVP or N tier architecture? If not which is more common and if you can link me to simple example of it. I want to implement a tic tac toe game in console application. I have a solution which hold two projects: TicTacToeBusinessLogic (Class library project) and TicTacToeConsoleApplication (Console application project) to represent the view logic. In the TicTacToeConsoleApplication I've Program.cs class which holds the main entry point (public static void Main). Now I face a problem. I want the game to handle its own game flow so I can: Create new GameManager class (from BL) but this causing the view to directly know the BL part. So I'm a little confused how to write it in an acceptable way. Should I use delegates? Please show me a simple example.

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• Handling array passed to object at creation

  - by cecilli0n

  When creating my object I pass it an array of a row from my database. (everything in the array we will need, disregarding unnecessary elements at sql query level) When I need to access certain array elements from within my class, I do so like $this->row['element'] However, As I continue development, I sometimes forget what exactly is in this passed array.(this itself doesn't seem good) I am wondering if their is a professional approach to dealing with this, Or am I the only one who has these "I wonder whats in the array" thoughts. One approach to tackling this could be that when we originally pass the array, in the constructor, we assign each element of the array to its own variable, but is this considered professional practice? Additionally by doing this, we could make those variables constants, in a attempt at immutability. Overall I am trying to adhere to good software craftsmanship. Regards.

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• Any frameworks or library allow me to run large amount of concurrent jobs schedully?

  - by Yoga

  Are there any high level programming frameworks that allow me to run large amount of concurrent jobs schedully? e.g. I have 100K of urls need to check their uptime every 5 minutes Definitely I can write a program to handle this, but then I need to handle concurrency, queuing, error handling, system throttling, job distribution etc. Will there be a framework that I only focus on a particular job (i.e. the ping task) and the system will take care of the scaling and error handling for me? I am open to any language.

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• Checking if %Y exists in current file in VimScript [closed]

  - by Eduan

  Like the title says. I would love to know how, with VimScript, I can do an if statement, that checks if %Y (for statusline) exists in the current file. This is what I have so far: if expand('%:Y') != "" let filetype=extend('%:Y') let filetype+= ",\ " else let filetype="" endif This is, of course, for my statusline, for which I don't want to show the filetype comma and space if the filetype doesn't exist. BTW, this is a direct copy of this StackOverflow question: http://stackoverflow.com/questions/13314264/checking-if-y-exists-in-current-file-in-vimscript

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• Severity and relation to occurence - priority?

  - by user970696

  I have been browsing through some webpages related to testing and found one dealing with the metrics of testing. It says: The severity level of a defect indicates the potential business impact for the end user (business impact = effect on the end user x frequency of occurrence). I do not think think this is correct or what am I missing? Usually it is the priority which is the result of such a calculation (severe bug that occurs rarely is still severe but does not have to be fixed immediately). Also from this description, what is the difference between the effect on the end user and business impact?

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• Lead/Manager vs Individual contributor which is better?

  - by User11091981

  Currently I am working in a company as a Manager (software dev). But I only have 6.8 yrs experience. I joined this company as a software engineer and got promoted to SSE, Lead and Manager. Some of my team members are having better experience than me, and I feel like I need to have more exposure/experience to take these roles. I feel like it is better to be an individual contributor learn many things for another couple of years and become a Principal Software Engineer, rather than involving in Management. Options I have: 1. Ask my current employer to make me an individual contributor? 2. Find a new company and join as an SSE to start over? 3. Find a new company for a lead position? Please advice.

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• Web api authentication techniques

  - by Steve

  We have a asp.net MVC web service framework for serving out xml/json for peoples Get requests but are struggling to figure out the best way (fast, easy, trivial for users coding with javascript or OO languages) to authenticate users. It's not that our data is sensitive or anything, we just want users to register so we can have their email address to notify them of changes and track usage. In our previous attempt we had the username in the URI and would just make sure that username existed and increment db tables with usage. This was super basic but we'd notice people using demo as a username etc so we need it to be a little more sophisticated. What authentication techniques are available? What do the major players use/do.

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• Is a "model" branch a common practice?

  - by dukeofgaming

  I just thought it could be a good thing to have a dedicated version control branch for all database schema changes and I wanted to know if anyone else is doing the same and what have the results been. Say that you are working with: Schema model/documentation (some file where you model the database visually to generate the schema source, say MySQL Workbench, with a .mwb file, which is binary) Schema source (a .sql file) Schema-based code generation The normal way we were working was with feature branches, so we would do changes to the model files (the database specific ones), and then have to regenerate points 2 and 3, dealing with the possible conflicts (or even code rewriting). Now say that your workflow goes the same way as the previous item numbering. With a model branch you wouldn't have to reconcile the schema model with binaries in other feature branches, or have to regenerate schema source and regenerate code (which might have human code on top of it). It makes so much sense to me it feels weird not having seen this earlier as a common practice. Edit: I'm counting on branch merges to be the assertions for the model matching the code. I use a DVCS, so I don't fear long-lived branches or scary-looking merges. I'm also doing feature branching.

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• Some hint to program a webservice "by subscription"

  - by Eagle

  I have some web sites programmed, I know to do it with python and PHP basically. Normally they are simple web sites, but now I want to provide REST web services but only for allowed users (allowed by me). I saw that a lot of services uses the "KEY" and "SECRET_KEY" concepts, which seems to be what I need (if I understand it right). My suppositions are: If I only do a GET service to retrieve, e.g., all my clients, without anymore, anyone can retrieve my clients without limitations. I will need some KEY generator to provide keys for my allowed users, so they can use my webservices. Only with a KEY is not enough: someone can steal a KEY and supplant my user (and this is the reason because exists a SECRET_KEY, right?). If all this is right, how can I make/use a system like that in my web services? Some open source example? Or maybe there are another easy solutions I'm not considering? My objective is to allow some users to use my web services.

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