instruction stringlengths 34 19.9k |
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I'm scraping text from various webshops (no images/videos or other data). I'm no expert on user tracking, so I'd like to know if there's a way for me to write my crawler so it won't interfere with the webshop owners tracking. Perhaps this is already the case since the crawler isn't storing any cookies, requesting image... |
I'm working in a creation of a new system that should be able to change the presentation layer without trouble, also be able to comport web-services, shop areas, internal control of data, creation of reports, multiple web portals, etc.
Following this post about the "benefits of multiple Projects and One Solution" on St... |
We ran into an unfortunate situation at work recently and I've been wondering what we can do to avoid similar problems in the future.
We make embedded systems. The FPGA code is in one SVN repository while the firmware & software code is in a different repository. Building the firmware requires the built FPGA images, so... |
Elsewhere, an argument has arisen over the terminology of a named function in CoffeeScript. In particular someone referred to something like this:
foo = ->
console.log("bar")
as a named function. But its been objected that everything in CoffeeScript is anonymous functions and there are no named functions. This is... |
Every time when user hears one music on system, the system stores this music to recent list, but I am afraid to pass over than decimal(19,0) limit in future. If I do Reseed I will get some problems insert invalid duplicate pirmary keys, but if I reallocate all id's it is possible.
Is there a better way for that? With p... |
I'm having a hard time coming up with a good naming convention for methods in derived classes that serve the same purpose as the methods in the base class. For example, if both the base class, and the derived class, need to initialize:
public class Foo()
{
public void Initialize()
{
// base class initia... |
I'm having trouble deciding how to design this service API.
public class GetCurrentValuesRequest
{
public int ReferenceID { get; set; }
public int[] FilterIDs { get; set; }
}
public class GetDefaultValuesRequest
{
public int[] FilterIDs { get; set; }
}
public class GetValuesAsOfDateRequest
{
public in... |
What is the best practice for checking multiple conditions, in no particular order?
The example in question needs to check four distinct conditions, in any order, and fail showing the correct error message.
The examples below use a C-like syntax.
Option 1: Check all at once
This method isn't preferred because the reaso... |
Is there any design pattern or practice recommended for business layer when dealing with multiple API version.
For example, I have something like this.
http://site.com/blogs/v1/?count=10
which calls business object method GetAllBlogs(int count) to get information
http://site.com/blogs/v2/?blog_count=20
which calls b... |
We have accumulated a large codebase of somewhat-well-document projects, many of which aren't actively being used, but that we want to be able to start using again quickly if necessary.
What is the best way to automatically make sure that these projects stay in working condition as the dependencies backing different pr... |
I'm implementing a .NET class which implements IDisposable. After being disposed, the object's state is invalid and so nobody should be accessing it, of course.
There are some situations where two essentially independent systems have access to the same instance of this class. One essentially "owns" the object but the... |
I'm implementing a system in C, implemented partially as a library. The library does most of the memory management itself, with the application layer just having to call *_destroy functions on the top-level objects.
While checking for memory leaks, I noticed that the number of calls to malloc seemed quite high, relativ... |
What endpoints should I provide, if any, to permit connectivity / availability testing for my web services / Web API?
TL;DR
I am developing both the server and client in an enterprise environment. The client will interface with the server via an RESTful Web API. I would like to provide an indication to the user that t... |
say I have an EntityManager that can read(PK) a dataset from the DB and return it.
I have an application that will process multiple records, iterate over them and for each, use the EntityManager to read each record.
Therefore it would be nice to inform that EntityManager about the coming workload so it is able to prelo... |
For one of the projects at uni we were given the task to create a custom, niche search engine. My colleges and I split the tasks amongst each other so that we can tackle the overall project more easily. My part is to create the indexer. I already read the wikipedia page on search engine indexers and some other related ... |
Serialization is used for persistence in Java. It may be okay to persist a few objects using serialization. But, for a large number of objects, ORM, Database etc might be better. It seems that serialization is useful only for small jobs. May be I am wrong. So please tell me
what are the advantages of serialization over... |
I haven't used Generics in C# for a long while. Every time I think I need to use them I either go in the wrong direction and give up or find that I don't really need them. I feel that I'm missing out or ignoring a technique which could be useful and powerful.
I'm aware of how generics are meant to be used (or at least ... |
Background
A discussion that has come up at work recently is how we handle audit logging and the recording of events. We are integrating with a 3rd party app so triggers are a no no from the off so we are handling it in code. We've written a number of prototype components for handling it but nothing feels right as ye... |
Should code quality metric evaluation tools like Sonar be integrated with IDE for running local analysis or should they be a part of the build process (like integrated with maven) for continuous inspection or should it be a combination of both? How can we leverage the power of such tools to the maximum extent possible?... |
I was reading this question:
I was trying to standardize and modularize some functions (Email
Management Module, CMS Module & etc) by implementing a 3-tier
architecture concept where each module would have its own independent
module database. So that in the future all we'd need to do is just
code a presentatio... |
I hear a lot about "Singletons are always bad" around the place. I don't hate on them to that degree but I try not to use them if I have a better alternative.
In this case I have a system that handles a lot of requests, each of which comes in on its own thread. Every request that comes in needs to be allocated its own ... |
If I split one class into two classes should both classes have history in source control tracing back to the original class that contained both; or should the new class be added as a new file without any history tracing back?
When splitting a large class into two similar sized parts this seems like the natural approach... |
I just read through this question, but I am still confused.
How can I know if my app is using undocumented API calls before submitting to it to the app store? Are there any tools I can use?
|
I've just taken on a new job at a college as (the sole) Web application developer.
The college has a number of disparate but all pretty badly coded legacy systems. Mostly built in PHP they deal with things like attendance, exam results, marking etc.
My first job is to build a system that incorporates a lot of this data... |
Our application requires an activity log of actions that a user has done. For example:
3/19/2013
-------------
9:37 AM Chuck Norris scrapped 3 robots.
9:15 AM Chuck Norris fought 3 robots.
Currently this is done with a gigantic query that compiles all of a user's activity on a given day. The query is so slow that tha... |
I am designing a new programming language.
I am designing a syntax to implement queries. Currently this is how it works.
The database is accessible through entity object.
on this sample I have "entity.manufacturers" and "entity.products" table
To get manufacturer with an ID of 1:
var @manufacturer = entity.manufact... |
I know that methods in a class should have high cohesion which roughly translates to having all the methods use all the instance variables directly or indirectly. I know that LCOM4 (Lack of cohesion)metric is useful for having a quantitative figure of how much cohesive the methods in a class are. A class with a LCOM4 v... |
Suppose we're unit testing a class with xUnit-like framework - so a test class is created for class-under-test. Now, how much should be tested by individual test methods?
Should there be one-to-one mapping between methods-under-test and test methods:
class TestMath {
testSqrt() {
assertEquals(Math.sqrt(4),... |
I'm very confused. I can't even begin to understand how MVC would be implemented outside of web development. This might seem like too general a question, but how would one apply MVC. I have the following general questions:
Are M, V, and C all meant to be one class each, or many. If many, how would
that work.
Most cl... |
These are Robert C. Martin's rules for TDD:
You are not allowed to write any production code unless it is to
make a failing unit test pass.
You are not allowed to write any more
of a unit test than is sufficient to fail; and compilation failures
are failures.
You are not allowed to write any more production code
tha... |
The project I am working on is version controlled by SVN, and the unspoken rule at work is to commit only when a new stable feature is added (in order to have a "clean" revision history with no revert) so I work sometimes for a few days without commiting.
However I am kind of a commiting maniac (several commits per day... |
I hope I picked the right group for this question...
I have this little framework I want to implement and I would like to have an opinion on it. In particular I am more concerned about the succinctness and style of the solution.
My class sketch looks like this:
public interface Builder<T> {
T build();
}
public in... |
How do you find the first common element in two arrays?
My attempt:
I looped through each at the same time and add the current value to a separate set for each of the lists. Also, check if the current element is already in the other list's set.
I have no idea if this works though and if so, why? I know it finds a commo... |
Often working with various jars and exploring the features specially in corner cases, I often realize and think that how is that they thought that it might be a useful scenario somewhere in future that it might be used and an API is made handy. So, how do they come to the conclusion what shall be provided and what not?... |
I've always had this struggle to get folks to update their issues, both at my company and at work. I've had a few cases when people actually do it from the goodness of their heart, but ~70% of the time I have to be chasing people down.
Being the one that generally does some or other form of management (I am firstmost a... |
I would like to add scripting support to an applications and with plenty scripting languages available I am a bit overwhelmed.
At first I thought about Python but I guess Python is a little too big for my taste and the application (although I like it very much, it gets a lot of things right in my opinion while the synt... |
I have written an application in Python using Tkinter and want to distribute under the WTFPL license. But I don't understand where to add the copying.txt file that needs to be added in the folder that is distributed.
Please clarify.
|
I am fairly new to web application development. I have defined my problem domain through talking to various stakeholders and putting a process map together - basically a flow chart showing the different steps and processes that the web application must be able to recreate.
The problem I am having is that I'm struggling... |
Java has
int and Integer
boolean and Boolean
This seems a bit inconsistent, why not either
bool vs Boolean to use an established shorter name for primitive type?
or
integer vs Integer to keep type names consistent?
I think C++ had decided to use bool quite a bit earlier than Java decided to use boolean, and maybe... |
I want to create a configuration file (text file preferred) that can be modified by user. A windows service will read from that file and behave accordingly. Can you recommend a file format for this kind of process?
What I have in my is a config file like the game config files, but could not imagine how to read from it... |
When working with CSS media queries, I am unsure of whether I should program in a mobile-first style, or a desktop-first style.
For example, let's say I'm given a design that consists of a set of blocks that are side-by-side. On desktop, I'll stick to spec, but on mobile, given the reduced screen area, two blocks stack... |
There is an endless data stream of XML messages (and "heartbeats"), that I receive via a telnet connection and through a site-to-site VPN IPsec tunnel.
I'm still pondering. What is the best/most elegant solution to process the XML messages without losing any data, without redundance and with a (nearly) constant proces... |
I have to read and write binary "chunks" of approximately 1Mb each. The data can come in the form of a stream or a in-memory byte[].
Normally I would use a Struct with a fixed layout, but there are a few properties of this binary data that are making this harder:
Byte 4 describes the "version" of the chunk
Byte 5 sta... |
As far as I know, most relational databases do not offer any driver-level API for queries, except a query function which takes an SQL string as an argument.
I'm thinking how easier it would be if one could do:
var result = mysql.select('article', {id: 3})
For joined tables, it would be slightly more complex, but still... |
I never did generic programming before, being more of a python guy, and generally using OOP. As I moved into generic programming, I faced some issues. I read the FAQ, but I am not satisfied. What I want to ask are the following questions (I am mostly interested in the first, but answering the others will be extremely w... |
I have a C++ API, I want to send commands through http to run any c++ method from this API. I'm using libmicrohttpd.
What steps should I follow to do such a work?
|
------------- 1 * -------------- * 1 --------
| Container |--------| Assignment |-----------| User |
------------- -------------- --------
^ ^
| |
---------- -------------
| | | ... |
I'm working on an app that involves real-time manipulation of vector paths at 60fps, and I'm very surprised by how little information there is on the subject. At first, I tried to implement my idea using CoreGraphics, but it didn't perform adequately for my purposes. I then discovered that there was a Khronos standard ... |
We are building a web interface to a tiered membership system, which will interface with a third-party CRM web service for the creation and management of accounts. The web service, unfortunately, is not yet built; however, we need to begin work.
I have created an interface, IMembershipService, in which I am beginning t... |
Given that C# has the unsafe keyword, are there situations in which it would still be beneficial to interoperate with C libraries?
I could see the need for very fast number crunching, graphical manipulation or matrix operations, using pre-existing C libraries. But is there a use case for writing greenfield DLL's in, s... |
I'm a bit confused so the question is a bit confusing. TL;dr: how to mix STL and OOP?
From the comment to Best overview to modern C++ paradigms? and http://www.boost.org/community/generic_programming.html there isn't much about objects-oriented programming. (boost guidelines mention object generators).
When planing a p... |
I am designing an application that has some scripting capabilities: the host application may call the scripts to perform some operations when some events occur. To keep it easy and newbie-friendly, there is a single thread for everything: this means that if the script calls something blocking, the entire application ha... |
When working on a backlog, you define epics and break them down into user stories. Epics are estimated and kept on the backlog as epics until they become important enough to be planned into one of the next sprints.
But once an epic is split into sprintable units, what do you do with the original epic? Do you keep it wi... |
I have a form (lets say a registration form) and onsubmit, it calls a function to validate as follows:
$.ajax({
url : "/ajax/validate.php",
type : "POST",
data : $(".form").serialize(),
success : function(data) {
data = $.parseJSON(data);
$.each(data, function(i, ... |
I just came from an interview in which they asked me several questions about programming and problem solving. Regarding the programming questions, I asked them to let me Google so I can see the code (I quoted that logic is the thing to learn, not the language). At the end of the interview they told me that my skills ve... |
What about confirming the functionality in positive tests, proving it is working - should I say it is a waste of time? What kind of concept is behind this quote?
Unsuccessful tests, i.e. tests that do not find errors are a waste of
time.
Web Engineering: The Discipline of Systematic Development of Web Applications ... |
Some software projects have a Contributor Licence Agreement. The agreement could, for instance, assign copyright of 3rd-party contributions to the original project creator. Could submitting a Pull Request on github ever constitute accepting such an agreement?
|
Uncle Bob says in Clean Code book that Unchecked Exceptions should be used. Now JDK has some checked exceptions: IOException, IllegalAccessException etc. which cannot be avoided.
In my application logic suppose I have an exception:
public class MyDomainException extends RunntimeException {
public MyDomainException(... |
I thought long and hard on weather to put this question in programmers or stack overflow. Please let me know if this is not the right place and I will post it to SO.
My friend and I am developing a display board that would need some configuration every now and then. e.g. setting contrast / backlight etc. Now this setti... |
I'm researching ways to create a OO-model/repository-layer using PHP's PDO. My idea was to create model classes that represent a domain object and a repository class for each model that has the responsibility of:
Saving to the database by taking a model as argument and mapping the objects properties to the VALUES of t... |
I have written a server/client program in which I am using 2 threads :
One to recieve data continously and
Other to send data as the user writes it on screen
Problem:
I have created the threads but durung execution ,the control gets stuck in
the recieving thread having the infinite loop to recieve data and never goe... |
I know what unit testing is in general and what JUnit is in particular. But here I see that there is a project called JUnitEE which seems to me to be a wrapper over JUnit. So I would like to better understand the pain point of using vanilla JUnit and how JUnitEE is able to solve those problems.
|
I'm curious, is there a standard approach to dealing with long lists in the Python community, and in particular, is there any antipathy toward doing blank lines followed by comments to break up a particularly long list, e.g. of tuples, or in a dict, etc.?
For example, I'm developing a GUI application in wxPython, and a... |
I am currently working with a system that acts like a message bus. A message comes in to the service (WCF Windows Service hosted). The system then uses a service locator pattern to look up which dynamically loaded assembly will be assigned to the message. The assembly is found and then a method is executed which han... |
I recently discovered (or rather realised how to use) Python's multiple inheritance, and am afraid I'm now using it in cases where it's not a good fit. I want to have some starting data source (NewsCacheDB,TwitterStream) that gets transformed in various ways (Vectorize,SelectKBest,SelectPercentile).
I found myself writ... |
I have a collection of products in a product group e.g.:
product-groups/123/products
If I need to add to the collection, is it OK that I pass only some products with PUT?
If I need to delete some products from the collection, is it OK that I pass filter data (an array of ID's) with DELETE?
What's the best way to imp... |
Currently our company develops applications consisting, most of the time, in Ruby on Rails web servers and a bunch of different REST clients, from kiosk systems in Java to embedded devices in C/C++ (besides the interfaces for standard web browsers). We need to expand our team and, having failed at finding good senior p... |
I am setting up an ETL process and small data warehouse for querying the data in a few different dimensions. One issue is that the schema for the objects can mutate over time - mainly that some fields will be added and some removed. What are some methodologies or approaches for handling this?
(Note the source data is m... |
I am trying to create a class which allows me to do something every 5 seconds and I want to be able to start and stop this from running from any of the other classes. Here is my Timer class:
public class Timer extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated ... |
I work for a company that develops a web server that runs in a customer datacenter. The customer wants the server to have hot failover and I'm currently investigating HA approaches such as Pacemaker and LVM (might as well have the backup doing something so I'm using load balancing as well).
It occurs to me that some o... |
I have a project where I need to allow users to run arbitrary, untrusted python code (a bit like this) against my server. I'm fairly new to python and I'd like to avoid making any mistakes that introduce security holes or other vulnerabilities into the system. Are there any best-practices available, recommended reading... |
Can anyone explain in detail, how exactly the virtual table works and what pointers are associated when virtual functions are called.
If they are actually slower, can you show the time that the virtual function takes to execute is more than normal class methods? It is easy to lose track of how/what is happening without... |
So I have a program with "cue" objects and each have their own table cell. The thing is that the table cells have loading bars on them that represent the progress of the cues. This presents the following question: How should I structure the program?
Should the objects representing the Cues store pointers to the table c... |
Many programming languages have only those 2 structures, and even some languages that have more structures still only provide special syntax for those 2; usually, [] and {}. Why is this? Is there anything special about those datatypes that is necessary for the completeness of the language?
|
I have a web host that supports cPanel and email addresses. I'm interested in creating a web app that checks for email messages, reads their contents and then does something with them, like interact with a database.
For example, Bob with email bob@gmail.com links his email address to his account on my web app. He send... |
One of the problems I have with null references is that they may not be exceptional. In my current position, there are few requirements and you are lucky if conventions are followed. This means being unable to handle a request is a frequent occurrence and throwing an exception is too slow (think millions of requests). ... |
I am a recruiter. I want to learn as much as I can about JEE5/JEE6 so when I try and find these types of candidates I can at least talk intelligently with them.
What I need to understand is what goes without saying?
So for example, if you were a J2EE or had experience with JEE5 or JEE6, could I assume you had spring an... |
I'm reading about design patterns. I know what this principle does.
High-level and low-level classes depend on abstractions. But why we say this is inversion?
|
I heard from a friend that Bjarne Stroustroup admitted that he doesn't know entirely the C++ programming language due to its vast complexity
Is it true and there's some referrable sources or is it just an exaggeration?
This affirmation should be present on his website, he told it in an interview/conference some time ag... |
I'm trying to devise a document system for a specific domain involving simple objects (People, Companies, Invoices, etc.) that would also be able to completely describe itself. This self-description ability would ideally be recursive. The document system will be based on JSON, but I believe the principle in question ap... |
I remember learning VB4 and dragging a button onto a form, double-clicking on that button, and typing code into that event handler I had just been magically blessed with. Coming from QBASIC I was thrilled with the "V" in "VB", the visual designer was literally the best thing since sliced bread.
Of course you could do a... |
In the Software testing book from Koirala, Sheihk, they say:
A positive test is when you put in a valid input and expect some
action to be completed in accordance with the specification.
A
negative test is when you put in an invalid input and receive errors.
Part of my question:
Let's say there is a requirement... |
What is wrong with using database tables with phpmyadmin or mysql? What are the benefits, if I'll use 'migration'?
|
When choosing a value based off of 2 boolean values in this format
var foo:int;
if (X){
foo = 50;
} else if (Y){
foo = -50;
} else {
foo = 0;
}
I discovered that I can condense this down by typecasting the boolean operations to integers, and mathing it up a bit like so:
var foo:int;
foo = ( int (X) - in... |
OK, so I paraphrased. The full quote:
The Internet was done so well that most people think of it as a natural resource like the Pacific Ocean, rather than something that was man-made. When was the last time a technology with a scale like that was so error-free? The Web, in comparison, is a joke. The Web was done by am... |
There is ambiguity in all papers I have read so I would like to ask about the following requirement:
Requirement: Being a Game master, I can access the GM menu by typing "menuInvoke".
Trying to do that as a regular player - is that a negative test or still positive in terms of verifying the requirement? Because some au... |
I don't know yet how it feels to be a part of dev/testing teams. If in an organization (mostly single-product company), can a developer handle testing efficiently?
From what I have read:
Developers do not like testing and hence effectiveness of testing suffers, Testing requires special tools and skills.
So in a work ... |
In our workplace we use simple ajax library for getting page data and submitting changes to the server. Sometimes we need to change the form’s field values. We know that fields can be of any type (dropdown, textbox, radio buttons, etc.) and one of the most annoying and tedious tasks was remembering each field’s ID so c... |
I have difficulty to learn about ant colony algorithm (ACO), I have read about generating crossword game using (genetic algorithm) GA.I Know both of GA ant ACO usually used for optimization, but my question is Is possible if create crossword game generator using ACO and how it can work for optimization in this case?
|
I'm creating a model where one element can contain other elements. I'm currently writing the interface to the model, and I'm not sure which is the best of the two options:
Option 1
interface Container {
List<Element> getElements(); // returns an unmodifiable list.
void addElement(Element e);
void removeElement(El... |
I normally work by myself as a freelancer, and the setup I use has worked pretty well for me so far. I'm not sure if it's the optimal setup for a team though.
I develop on Windows, and I setup a Linux VM on my local machine, running the same OS/stack as our production machines (CentOS, Nginx, PHP-FPM). I setup Samba, a... |
Ruby on Rails
Twitter Bootstrap
Html5Boilerplate
Backbone.JS or Knockout.JS
I sort of understand what each one is individually, but my understanding isn't strong enough to understand whether some of them sort of overlap in functionality and whether any subset of that list contains items you wouldn't use togethe... |
I have a scripting engine I just published as an open source project. It's been sitting on my harddrive waiting for about a year. My engine of course isn't complete in any way, but it does work for simple scripts. It has a javascript-ish feel to it, but I don't wish to abide by the ECMA spec or anything.
Now, the big ... |
I have the following situation: I have to create a website and a web service that will share a part of the functionalities.
This is why I do not want to write code twice.
I have thought of the following architecture:
MyApp.BusinessLogic --> here we save the DataModels to the database
MyApp.DataAccess -> DataModels & En... |
I have a database having around 15 tables.Currently I am working on a report generation page, which is having 16 criteria.The values are distributed among multiple tables.User can select any number of search criteria. The problem is, if the user is entering 2-3 values, it is better to filter first by certain value and ... |
I am doing an internship on Big Data technologies so I am new to this area. My question is about the use of NoSQL in the Big Data architecture. Do we need always to use a distributed storage (like HDFS in the case of Hadoop) then to put on top a NoSQL databases (like Hbase )?
I find it difficult to understand the typic... |
I'm creating an application which needs to have a key file based product activation.
If a user purchases the application, the key file may have to be attached to the application EXE file dynamically (may be online) and package it to an MSI installer. The user downloads the application from a server or repository.
How c... |
In a lot of examples for the Azure platform I'm seeing a lot of self-administration happening: an application will test for the presence of an external system such as a queue or database and create the necessary structures it needs to function.
This behaviour seems contrary to a more traditional application's environme... |
I've been taught since high school that defining variables like this:
int _a;
or
int __a;
should be consider bad practice because this would eventually puzzle compilers that use variables starting with an underscore to name temporary variables.
As far as I know this is the reason why some people like to move the unde... |
I have seen on some sites which say ,for-example, multiple votes/views from same computer will be neglected/penalized etc. For-example liking a facebook page, or youtube video from same computer(different accounts) will not increase its worth(according to my knowledge).
How do these sites identify bogus votes? I just n... |
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