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• Is it better to build HTML Code string on the server or on the client side?

  - by Ionut

  The result of the following process should be a html form. This form's structure varies from one to user. For example there might be a different number of rows or there may be the need for rowspan and colspan. When the user chooses to see this table an ajax call is made to the server where the structure of the table is decided from the database. Then I have to create the html code for the table structure which will be inserted in the DOM via JavaScript. The following problem comes to my mind: Where should I build the HTML code which will be inserted in the DOM? On the server side or should I send some parameters in the ajax call method and process the structure there? Therefore the main question involves good practice when it comes to decide between Server side processing or client side processing. Thank you!

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• Node.js Or servlets?

  - by Nilesh

  I have heard a lot and read about the Javascript server side language i.e Node.js, and saw many comparisons in favor of Node. I don't understand what makes it better or faster, or how it even relates to something as mature as Java Servlets. But Servlets are built on top of a multithreaded programming language as opposed to Node.js. Then how can node.js be faster? If suppose 1000K users query for a database records, then shouldn't Node.js be slower than Servlets. Also Don't servlets have better security compared to Node.js?

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• In a SSL web application, what would be the vulnerabilities of using session based authentication?

  - by Thomas C. G. de Vilhena

  I'm not sure the term even exists, so let me explain what I mean by "session based authentication" through some pseudo-code: void PerformLogin(string userName, string password) { if(AreValidCredentials(userName, password)) { Session.Set("IsAuthenticated", true); } else { Message.Show("Invalid credentials!"); } } So the above method simply verifies the provided credentials are valid and then sets a session flag to indicate that the session user is authenticated. Under plain HTTP that is obviously unsafe, because anyone could hijack the session cookie/querystring and breach security. However, under HTTPS the session cookie/querystring is protected because client-server communication is encrypted, so I believe this authentication approach would be safe, wouldn't it? I'm asking this because I want to know how authentication tickets can improve web applications security. Thanks in advance!

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• Is it typical for a provider of a web services to also provide client libraries?

  - by HDave

  My company is building a corporate Java web-app and we are leaning towards using GWT-RPC as the client-server protocol for performance reasons. However, in the future, we will need to provide an API for other enterprise systems to access our data as well. For this, we were thinking of a SOAP based web service. In my experience it is common for commercial providers of enterprise web applications to provide client libraries (Java, .NET, C#, etc.). Is this generally the case? I ask because if so, then why bother using SOAP or REST or any standard web services protocol at all? Why not just create a client libraries that communicate via GWT-RPC?

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• How would you gather client's data on Google App Engine without using Datastore/Backend Instances too much?

  - by ruslan

  I'm relatively new to StackExchange and not sure if it's appropriate place to ask design question. Site gives me a hint "The question you're asking appears subjective and is likely to be closed". Please let me know. Anyway.. One of the projects I'm working on is online survey engine. It's my first big commercial project on Google App Engine. I need your advice on how to collect stats and efficiently record them in DataStore without bankrupting me. Initial requirements are: After user finishes survey client sends list of pairs [ID (int) + PercentHit (double)]. This list shows how close answers of this user match predefined answers of reference answerers (which identified by IDs). I call them "target IDs". Creator of the survey wants to see aggregated % for given IDs for last hour, particular timeframe or from the beginning of the survey. Some surveys may have thousands of target/reference answerers. So I created entity public class HitsStatsDO implements Serializable { @Id transient private Long id; transient private Long version = (long) 0; transient private Long startDate; @Parent transient private Key parent; // fake parent which contains target id @Transient int targetId; private double avgPercent; private long hitCount; } But writing HitsStatsDO for each target from each user would give a lot of data. For instance I had a survey with 3000 targets which was answered by ~4 million people within one week with 300K people taking survey in first day. Even if we assume they were answering it evenly for 24 hours it would give us ~1040 writes/second. Obviously it hits concurrent writes limit of Datastore. I decided I'll collect data for one hour and save that, that's why there are avgPercent and hitCount in HitsStatsDO. GAE instances are stateless so I had to use dynamic backend instance. There I have something like this: // Contains stats for one hour private class Shard { ReadWriteLock lock = new ReentrantReadWriteLock(); Map<Integer, HitsStatsDO> map = new HashMap<Integer, HitsStatsDO>(); // Key is target ID public void saveToDatastore(); public void updateStats(Long startDate, Map<Integer, Double> hits); } and map with shard for current hour and previous hour (which doesn't stay here for long) private HashMap<Long, Shard> shards = new HashMap<Long, Shard>(); // Key is HitsStatsDO.startDate So once per hour I dump Shard for previous hour to Datastore. Plus I have class LifetimeStats which keeps Map<Integer, HitsStatsDO> in memcached where map-key is target ID. Also in my backend shutdown hook method I dump stats for unfinished hour to Datastore. There is only one major issue here - I have only ONE backend instance :) It raises following questions on which I'd like to hear your opinion: Can I do this without using backend instance ? What if one instance is not enough ? How can I split data between multiple dynamic backend instances? It hard because I don't know how many I have because Google creates new one as load increases. I know I can launch exact number of resident backend instances. But how many ? 2, 5, 10 ? What if I have no load at all for a week. Constantly running 10 backend instances is too expensive. What do I do with data from clients while backend instance is dead/restarting? Thank you very much in advance for your thoughts.

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• Why is iOS "jailbreaking" CPU specific? [closed]

  - by Ted Wong

  Recently, iOS 6 was "jailbroken" but only on the Apple A4 CPU. Why is the "jailbreaking" process specific to a CPU? From Wikipedia: ... "iOS jailbreaking is the process of removing the limitations imposed by Apple on devices running the iOS operating system through the use of hardware/software exploits – such devices include the iPhone, iPod touch, iPad, and second generation Apple TV. Jailbreaking allows iOS users to gain root access to the operating system""" ...

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• Permissions and MVC

  - by not-rightfold

  I’m in the progress of developing a web application. This web application is mostly a CRUD interface, although some users are only allowed to perform some actions and see only some parts of views. What would be a reasonable way to handle user permissions, given that some parts of views are not available to users? I was thinking of having a function hasPermission(permission) that returns true iff the current user has the given permission, although it would require conditionals around all parts of views that are only visible to some users. For example: {% if has_permission('view_location') %} {{ product.location }} {% endif %} I’m fearing this will become an ugly and unreadable mess, especially since these permissions can get kind of complicated. How is this problem commonly solved in web applications? I’m considering using Haskell with Happstack or Python with Django.

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• Avoid GPL violation by moving library out of process

  - by Andrey

  Assume there is a library that is licensed under GPL. I want to use it is closed source project. I do following: Create small wrapper application around that GPL library that listens to socket, parse messages and call GPL library. Then returns results back. Release it's sources (to comply with GPL) Create client for this wrapper in my main application and don't release sources. I know that this adds huge overhead compared to static/dynamic linking, but I am interested in theoretical way.

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• Graduated transition from Green - Yellow - Red

  - by GoldBishop

  I have am having algorithm mental block in designing a way to transition from Green to Red, as smoothly as possible with a, potentially, unknown length of time to transition. For testing purposes, i will be using 300 as my model timespan but the methodology algorithm design needs to be flexible enough to account for larger or even smaller timespans. Figured using RGB would probably be the best to transition with, but open to other color creation types, assuming its native to .Net (VB/C#). Currently i have: t = 300 x = t/2 z = 0 low = Green (0, 255, 0) mid = Yellow (255, 255, 0) high = Red (255, 0, 0) Lastly, sort of an optional piece, is to account for the possibility of the low, mid, and high color's to be flexible as well. I assume that there would need to be a check to make sure that someone isnt putting in low = (255,0,0), mid=(254,0,0), and high=(253,0,0). Outside of this anomaly, which i will handle myself based on the best approach to evaluate a color. Question: What would be the best approach to do the transition from low to mid and then from mid to high? What would be some potential pitfalls of implementing this type of design, if any?

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• How vibrations might effect Kinect depth measurements

  - by dreza

  I'm currently doing some research into development with the Microsoft Kinect product. My project manager has come up with a potential design for mounting the camera to do the capturing. However the solution means that the camera might be subject to vibrations as the platform it is on is directly connected to where the subjects will be moving. It was my thought that vibrations would effect the quality of the results, however I could not come up with a viable explanation as to why, other than it's the same as if you held a camera in your hand and your hand was shaking vs using a tripod. Do vibrations effect the depth measurements on a Kinect and if so how can I explain this in simple terms to my PM to help come up with a better design to attach the sensor to?

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• Is the output of Eclipse's incremental java compiler used in production? Or is it simply to support Eclipse's features?

  - by Doug T.

  I'm new to Java and Eclipse. One of my most recent discoveries was how Eclipse comes shipped with its own java compiler (ejc) for doing incremental builds. Eclipse seems to by default output incrementally built class files to the projRoot/bin folder. I've noticed too that many projects come with ant files to build the project that uses the java compiler built into the system for doing the production builds. Coming from a Windows/Visual Studio world where Visual Studio is invoking the compiler for both production and debugging, I'm used to the IDE having a more intimate relationship with the command-line compiler. I'm used to the project being the make file. So my mental model is a little off. Is whats produced by Eclipse ever used in production? Or is it typically only used to support Eclipse's features (ie its intellisense/incremental building/etc)? Is it typical that for the final "release" build of a project, that ant, maven, or another tool is used to do the full build from the command line? Mostly I'm looking for the general convention in the Eclipse/Java community. I realize that there may be some outliers out there who DO use ecj in production, but is this generally frowned upon? Or is this normal/accepted practice?

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• MVP Pattern Philsophical Question - Security Checking in UI

  - by Brian

  Hello, I have a philosophical question about the MVP pattern: I have a component that checks whether a user has access to a certain privilege. This privilege turns on or off certain UI features. For instance, suppose you have a UI grid, and for each row that gets bound, I do a security check to see if certain features in the grid should be enabled or disabled. There are two ways to do this: have the UI/view call the component's method, determine if it has access, and enable/disable or show/hide. The other is have the view fire an event to the presenter, have the presenter do the check and return the access back down to the view through the model or through the event arg. As per the MVP pattern, which component should security checks fit into, the presenter or the view? Since the view is using it to determine its accessibility, it seems more fitting in the view, but it is doing database checks and all inside this business component, and there is business logic there, so I can see the reverse argument too. Thoughts? Thanks.

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• Version hash to solve Event Sourcing problems

  - by SystematicFrank

  The basic examples I have seen about Event Sourcing do not deal with out of order events, clock offsets in different systems and late events from system partitions. I am wondering if more polished Event Sourcing implementations rely on a version stamp of modified objects? For example, assuming that the system is rendering the entity Client with version id ABCD1234. If the user modifies the entity, the system will create an event with the modified fields AND the version id reference to which version it applies. Later the event responder would detect out of order events and merge them.

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• Looking for a Python UI library comparable with Windows Forms [on hold]

  - by Mitten

  I am looking for a Python UI library which I could use to develop a desktop GUI comparable to what can be done with .NET Windows Forms. I have no previous experience programming UI in Python, so I would rather choose (if there is a choice) something simple. The application I am building would be a document oriented - rich texts, lists and grids, I don't expect to use much graphics - mostly formatted texts. Any pointers, and if there is more than one major GUI library available for Python - how could I quickly test them to see which one is a better fit for my needs?

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• Do I deserve a promotion/higher salary?

  - by anonCoder

  I'm a software developer and have been working at my current employer for almost 2 years. I joined straight out of university, so this is my first real full-time job. I was employed as a junior developer with no real responsibilities. In the last year, I have been given more responsiibility. I am the official contact person at my company for a number of clients. I have represented the company by myself in off-site meetings with clients. My software development role has grown. I now have specialised knowledge in certain tools/products/technologies that no one else here does. My problem is that I am still officially a junior developer, and still earning less than I feel I am worth. Am I being taken advantage of? How long should I reasonably expect to stay a junior developer before I expect a promotion of some kind? What would you do in my situation?

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• Is reference to bug/issue in commit message considered good practice?

  - by Christian P

  I'm working on a project where we have the source control set up to automatically write notes in the bug tracker. We simply write the bug issue ID in the commit message and the commit message is added as a note to the bug tracker. I can see only a few downsides for this practice. If sometime in the future the source code gets separated from the bug tracking software (or the reported bugs/issues are somehow lost). Or when someone is looking in the history of commits but doesn't have access to our bug tracker. My question is if having a bug/issue reference in the commit message is considered good practice? Are there some other downsides?

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• Is Silverlight only for eye-candy, or does it have a use in business?

  - by Cyberherbalist

  Granted that Silverlight may make eye-popping websites of great beauty, is there any justification for using it to make practical web applications that have serious business purposes? I'd like to use it (to learn it) for a new assignment I have, which is to build a web-based application that keeps track of the data interfaces used in our organization, but I'm not sure how to justify it, even to myself. Any thoughts on this? If I can't justify it then I will have to build the app using the same old tired straight ASP.NET approach I've used (it seems) a hundred times already.

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• Scrum - real life example?

  - by Camilo

  I'm starting with scrum and saw many partial examples on books and tutorials, but when try to use scrum in the real life, it's not easy to write the user stories and create the product backlog. I want to see a real project with user stories, product backlog and sprint backlogs to see if I'm doing it in the correct way. Is there any open source project with a public product backlog ? Is there any shared complete user stories and product backlog from a real project?

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• When should I use AtomPub?

  - by Gary Rowe

  I have been conducting some research into RESTful web service design and I've reached what I think is a key decision point so I thought I'd offer it up to the community to get some advice. In keeping with the principles of a RESTful architecture I want to present a discoverable API, so I will be supporting the various HTTP verbs as fully as possible. My difficulty comes with the choice of representation of those resources. You see, it would be easy for me to come up with my own API that covers how search results are to be presented and how links to other resources are provided, but this would be unique to my application. I've read about the Atom Publishing Protocol (RFC 5023), and how OData promotes its use, but it seems to add an extra level of abstraction over what is (currently) a rather simple API. So my question is, when should a developer select AtomPub as their choice of representation - if at all? And if not, what is the current recommended approach?

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• Do I really need to learn Python? [closed]

  - by Pouya

  These days, I see the name "Python" a lot. Mostly when I'm doing some programming on linux/mac, I see a trace of Python. I have a fair knowledge of C++ and I'm quite good at Java. I also know Delphi which comes handy sometimes. I've been good with these languages, however, I was wondering if learning Python could make it better. What does it offer that makes it worth learning? What are its key/unique advantages/features?

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• Survival rate of open source projects

  - by Shogoot

  I'm trying to write a paper on why or why not an open source project will have good odds for survival or not. I've found very few articles on the Internet on the topic or I'm just searching with the wrong terms. I've tried: "open source" survival "open source" success failure "open source" determinants for success So far i've only found this, which says some on the topic. So I turn to you my dear stackers! Help me find some arguments and articles that will throw some clarity on the subject.

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• How to deal with social login

  - by Matteo Pagliazzi

  In my new web app I'm going to allow social login through Twitter (maybe), Facebook and Google and I'm in search of the best way to do it. Actually I'm using Rails with Devise + Omniauth and this is the problem: Should I ask the user to choose a password so that he can login without a social network? Or maybe the user should be able to set a password if he want (for example when editing his account?) The second way seems the best one but since Twitter doesn't provide user email and google doesn't provide an username I'll probably have to ask the user for username/email when he log in so in that case I may also ask for the password... waht do you think?

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• Simplifying C++11 optimal parameter passing when a copy is needed

  - by Mr.C64

  It seems to me that in C++11 lots of attention was made to simplify returning values from functions and methods, i.e.: with move semantics it's possible to simply return heavy-to-copy but cheap-to-move values (while in C++98/03 the general guideline was to use output parameters via non-const references or pointers), e.g.: // C++11 style vector<string> MakeAVeryBigStringList(); // C++98/03 style void MakeAVeryBigStringList(vector<string>& result); On the other side, it seems to me that more work should be done on input parameter passing, in particular when a copy of an input parameter is needed, e.g. in constructors and setters. My understanding is that the best technique in this case is to use templates and std::forward<>, e.g. (following the pattern of this answer on C++11 optimal parameter passing): class Person { std::string m_name; public: template <class T, class = typename std::enable_if < std::is_constructible<std::string, T>::value >::type> explicit Person(T&& name) : m_name(std::forward<T>(name)) { } ... }; A similar code could be written for setters. Frankly, this code seems boilerplate and complex, and doesn't scale up well when there are more parameters (e.g. if a surname attribute is added to the above class). Would it be possible to add a new feature to C++11 to simplify code like this (just like lambdas simplify C++98/03 code with functors in several cases)? I was thinking of a syntax with some special character, like @ (since introducing a &&& in addition to && would be too much typing :) e.g.: class Person { std::string m_name; public: /* Simplified syntax to produce boilerplate code like this: template <class T, class = typename std::enable_if < std::is_constructible<std::string, T>::value >::type> */ explicit Person(std::string@ name) : m_name(name) // implicit std::forward as well { } ... }; This would be very convenient also for more complex cases involving more parameters, e.g. Person(std::string@ name, std::string@ surname) : m_name(name), m_surname(surname) { } Would it be possible to add a simplified convenient syntax like this in C++? What would be the downsides of such a syntax?

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• Architecture- Tracking lead origin when data is submitted by a server

  - by Kevin

  I'm looking for some assistance in determining the least complex strategy for tracking leads on an affiliate's website. The idea is to make the affiliate's integration with my application as easy as possible. I've run into theoretical barriers, so i'm here to explore other options. Application Overview: This is a lead aggregation / distribution platform. We will be focusing on the affiliate portion of this website. Essentially affiliates sign up, enter in marketing campaigns and sell us their conversions. Problem to be solved: We want to track a lead's origin and other events on the affiliate site. We want to know what pages, ads, and forms they viewed before they converted. This can easily be solved with pixel tracking. Very straightforward. Theoretical Issues: I thought I would ask affiliates to place the pixel where I could log impressions and set a third party cookie when the pixel is first called. Then I could associate future impressions with this cookie. The problem is that when the visitor converts on the affiliate's site and I receive their information via HTTP POST from the Affiliate's server I wouldn't be able to access the cookie and associate it with the lead record unless the lead lands on my processor via a redirect and is then redirected back to the affiliate's landing page. I don't want to force the affiliates to submit their forms directly to my tracking site, so allowing them to make an HTTP POST from their server side form processor would be ideal. I've considered writing JavaScript to set a First Party cookie but this seems to make things more complicated for the affiliate. I also considered having the affiliate submit the lead's data via a conversion pixel. This seems to be the most ideal scenario so far as almost all pixels are as easy as copy/paste. The only complication comes from the conversion pixel- which would submit all of the lead information and the request would come from the visitor's machine so I could access my third party cookie.

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• How do I correctly sub-license a library that is under the MIT license?

  - by Petah

  How do I correctly sub-license a library that is under the MIT license. I am using and extending the library. The MIT license states that I am free to sub-license the library. Can I simply state: <Software library> is copyright <original author> and licensed under the MIT license. <orignal license> Extensions to <Software library> are copyright <me> and licensed under the GPL license, or commercial license if applicable. <GPL, or commercial license>

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