Questions about problem solving and planning for a solution through software design.
3
votes
2answers
197 views
Design interface for WebService to access several MySQL databases
I am currently trying to design an interface for a WebService that can access several MySQL databases. There will be 4 operations available, Add(), Read(), Update() and Delete().
The WebService just ...
-2
votes
1answer
150 views
unix time or datetime when designing a class library
I'm writing a python library which wraps a web API. This is for my own use, but I may open-source it in the future, so I'm trying to design it Right.
For methods which take/return a time, I can't ...
1
vote
1answer
33 views
multiple accounts with the same roles represented as one row in the database
Say there is an online hotel management application. One feature is the Receptionist will confirm and cancel bookings made by the customer. So all Receptionists do the same things. Is it bad practice ...
1
vote
2answers
124 views
Better application design - where to place interfaces
Where to place interfaces in a typical multi-layered app with DataAccess, BusinessLogic and an Endpoint modules? I propose 2 options
In both cases there's only dependency from abstractions, but in ...
3
votes
2answers
536 views
Where should the database and mail parameters be stored in a Symfony2 app?
In the default folder structure for a Symfony2 project the database and mail server credentials are stored in parameters.yml file inside ProjectRoot/app/config/parameters.yml with these default ...
24
votes
1answer
4k views
DRY unrelated, but nearly identical, code
I have some code that is nearly identical, but uses absolutely different types, with no inheritance between them, on the main variable. Specifically, I am writing an analyzer with Roslyn for C# and ...
0
votes
0answers
32 views
OOP style class wrapper for bulk records?
Recently I've been tasked with building an application that synchronizes data between two databases.
I've created AccountingService class for the source database and a bunch or repository classes for ...
0
votes
1answer
122 views
Flat files for events and alarms
So I'm working on a project that I was introduced to a year ago. One of the features of project involves alarming the users when certain events are triggered. There is also a log of these events. ...
1
vote
2answers
108 views
What common software interfaces would break assuming no function that returns a value can have side-effects [on hold]
edit: The question turns out to be trivial to answer. Almost every language allows to replace functions with a return value with functions without a return value and an out parameter instead, in some ...
3
votes
2answers
154 views
OO Design Question - Library/Objects for API which includes id references
Public api:
getClients / getClientById - returns a json object like:
{ clientid: 1, name: "Client1" }
getProjects / getProjectById - returns a json object like
{ projectid: 5, name: ...
4
votes
3answers
344 views
IoC invalidation
I have a bunch of services that get registered as singletons by my IoC container on startup, all of these services have a constructor which takes in a connection string which is used by the underlying ...
3
votes
1answer
58 views
Who is the Owner of Information? Memento vs. Originator
Imagine for a second that I'm implementing the Memento Pattern, using the following classes.
Classes
An Originator class that has public and private, properties and fields respectively
A Memento ...
2
votes
3answers
130 views
How to simplify structure of a monitoring software that uses the Observer pattern?
I am working on a project where I have to monitor the status of an elevator. So far, my design looks like this:
We are using a third party library to read and monitor real-time values from the ...
1
vote
1answer
77 views
How do I refactor a loop that does aggregation while doing it's regular job ?
What am I suppose to do
I am working on an API, where I get a list of objects from the output of an SQL query using an ORM. Now this API call needs to send following information down to the client.
...
2
votes
1answer
105 views
Reuse already fetched data for request
I have action that fetches user model from db to check access.
Then I have method that in some cases requires same model.
function checkAccess(req, res, next) {
var data = ...
19
votes
3answers
19k views
AngularJS: structuring a web application with multiple ng-apps
The blogosphere has a number of articles on the topic of AngularJS app structuring guidelines such as these (and others):
http://www.johnpapa.net/angular-app-structuring-guidelines/
...
-2
votes
0answers
40 views
Average size of UML projects [closed]
I need to estimate the scalability of a tool which is an add-on for a software modeling tool Enterprise Architect. The tool implements algorithms of O(n2) complexity. These algorithms scan "each ...
0
votes
0answers
11 views
SharePoint upload data - function refactoring - design questions [migrated]
I currently have a series of functions that write to various SharePoint lists, I am trying to amalgamate them into a single function but want to be able to have an elegant way to do this.
each ...
17
votes
9answers
1k views
How to recruit programmers for an open source project and kick-start it? [closed]
I would like to start an open source project, and would like to do a collaborative effort in starting it.
I have a clear idea of what I want, but not yet a formal specification (I would like to do ...
5
votes
3answers
580 views
Multiple Small Programs Connected via Sockets vs One Large Program [closed]
I am at the beginning of a project which involves reading from several sensors and fusing the data from those sensors together. Altogether there will be 4 sensors connected via USB and a webcam, also ...
4
votes
2answers
146 views
Fix a leaky abstraction (type checking)
I have a method that accepts an interface and does type checking on the parameter, and depending upon the type a decision is made to either send an email or an alert
public void ...
0
votes
0answers
47 views
Best way to implement signal/slots for application menu [migrated]
I want to create a desktop application using Qt framework. The main application will have a menu bar and every menu many actions.
In order to achieve this I've a MainApplication class, a MenuBar ...
0
votes
0answers
57 views
MVVM with multiple view models that share a model
I have an application where there is an "inventor" model whose data I would like to display differently in different areas of the application. Therefore, I'd like to create different view models ...
1
vote
1answer
152 views
How to avoid tying these two methods together with global mutable state?
I'm in the process of reading Code Complete 2 and learned that using global state is a no-no. What can I do to avoid using global state in this situation?
Some background information: I have two ...
3
votes
2answers
899 views
How is intermediate data organized in MapReduce?
From what I understand, each mapper outputs an intermediate file. The intermediate data (data contained in each intermediate file) is then sorted by key.
Then, a reducer is assigned a key by the ...
1
vote
0answers
79 views
How Should I Design Models With Deep Relationship Structures?
I am designing a web application in ASP.NET MVC, which uses ADO.NET for the database access.
In the past, I generally have put together a series of classes each of which, maps to one table in a ...
2
votes
2answers
58 views
How to reduce redundancy in a service implemented using multilayer architecture while maintaining consistency across the system?
Currently our service is implemented using a multilayer architecture dividing the whole service into three:
API
Business
Persistence
However this introduces a lot of redundancy within our system. ...
0
votes
1answer
27 views
Availability on updating, migration, etc
When you want to update, migrate or deploy-new-version of a large and/or critical system, absolutely, you can't shutdown the system and do your job, then start it!!! I want to know what's the ...
1
vote
2answers
235 views
Best approach for a server configuration data collection and reporting solution from a legacy script?
I have a project which involves collecting config data from windows servers in our (very large) server estate. My manager wants me to collect over 150 data items across all configuration areas ...
1
vote
1answer
55 views
How “close” should a IO class/logic be to a form or thread that controls the IO device?
I am having a difficult time determining where my IO logic should reside within my application. In this application there are multiple IO devices both USB and serial. I currently have the idea to ...
1
vote
3answers
132 views
Help me design this use case
I have following entities:
Data:
User_id
Categories: Interests, Disinterests, Categories A, B C...
Each categories have sub categories: Interests=Gaming, Physics, Programming etc..
Now each user ...
2
votes
1answer
147 views
Is it a good idea to have separate UI components make their own webservice calls?
I have few UI components in an angularjs web-application. Each display data based upon same input. One shows stats which are calculated on the basis of a time period. Other shows a chart of daily ...
8
votes
1answer
271 views
C++ serialization design review
I am writing a C++ application. Most applications read and write data citation needed and this one is no exception. I created a high level design for the data model and serialization logic. This ...
33
votes
11answers
15k views
Is catching general exceptions really a bad thing?
I typically agree with most code analysis warnings, and I try to adhere to them. However, I'm having a harder time with this one:
CA1031: Do not catch general exception types
I understand the ...
1
vote
0answers
33 views
Abstract Alert Dialog Builders (Same Method Calls, Different Objects)
Currently I'm working on an Android library that creates a dialog which allows to select colors from a palette (examples at the end) and I've stumbled upon an interesting design problem.
To create ...
0
votes
3answers
98 views
Responsibility of the small business logic: in a class or in a method? [closed]
I have separated business logic to many small blocks. Each block can be coded in small number of lines.
Where should I put the block code?
[A] in a method, grouped in the class by some same feature
...
3
votes
6answers
788 views
Is scanning the ports considered harmful? [closed]
If any application is scanning the ports of other machines, to find out whether any particular service/application is running, will it be considered harmful? Is this treated as hacking?
How else can ...
3
votes
1answer
78 views
Designing a ticketing system where the User and Administrator have similar but different functionality
I am designing a simple ticketing system in Laravel 4. The system will simply allow a User to create a ticket, and an Administrator to answer it.
The User will be able to:
View a list of his ...
1
vote
3answers
130 views
How can I create an abstract parent class which uses data from an inherited class?
I'm getting my feet wet with Android app development and tying to find a good way to manage database interactions across multiple similar objects. My goal was to have a structure like:
public ...
2
votes
1answer
95 views
Integration between services in a SOA
Assume we have a Bounded Context for Inventory (InventoryBC) and another one for Shipments (ShipmentsBC). These 2 BCs need to communicate together. They are hosted on 2 different services on different ...
4
votes
1answer
601 views
Capturing mobile device system (output) audio
I'm trying to figure out a way to capture the system audio of an Android and/or Windows Phone. The idea is to provide a stream based on the music I'm currently playing on my phone.
What I'm not sure ...
2
votes
3answers
658 views
can you have too many dto/bo - mapping method
I have a windows service, 2 web services and a web interface that need to follow the same path (data wise).
So I came up with two ways of creating my solution.
My concern is the fact that the ...
4
votes
4answers
432 views
When should code favour optimization over readability and ease-of-use?
I am in the process of designing a small library, where one of my design goals is that the API should be as close to the domain language as possible. While working on the design, I've noticed that ...
0
votes
2answers
156 views
Ensuring program output is always the same [closed]
I am working on a +10k LOC program, and I need to ensure its output is always the same for given input. The program consists of dozens of modules and classes, inherited by a MainClass.
Initially I ...
3
votes
3answers
355 views
Object creation: when should I expose a factory vs wrapping class?
I am having some problems trying to figure out when to use a factory or to wrapper class. This question is slightly geared towards C# I guess, so I'm not sure if this is the correct place to ask.
Say ...
0
votes
1answer
74 views
Best Practices: URL Path Parameters [closed]
What's the current best practice around path parameters in URLs?
For instance
/artist/name
A long time ago I might have made artist.html and then passed in a query parameter /artist.html?name=name ...
1
vote
1answer
666 views
MVC URL structure with URI parameters
When creating routes for your MVC web application I have seen two possible ways to pass variables to a controller method:
With the first approach the variable is passed to a parameter of the ...
1
vote
4answers
181 views
Strategy pattern and “Is a” relationship
Imagine, I have class IAlgo which is an interface. I have derived from him and implemented his single method called matchCount in different implementations - AlgoA1, AlgoA2, AlgoA3, AlgoB1, AlgoB2.
...
0
votes
1answer
80 views
How to design resilient web service clients?
I am writing an app that is supposed to talk to a web service. Let's say it's a chat app. It would need to receive a stream of new messages (so that they are pushed to the interface as quickly as ...
4
votes
3answers
247 views
Fine grained search over a large dataset
I have roughly 4 million records per day and have to keep 7 years worth online, so we are looking at 10.2 billion records that I need to be able to search through. The users are expecting that the ...
