Questions about problem solving and planning for a solution through software design.

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1answer
233 views

Erlang chat app design?

I have a chat app made in node/socket.io. Scalability factors have made us choose Erlang/Ejabberd/xmpp and it will replace node/socket. I have a few questions: Currently using MySql for chat ...
36
votes
5answers
1k views

What's the right way to work with a graphic designer?

Recently, we worked with a graphic designer (arranged by the client) to provide the skin for a Django+Bootstrap application we had built. The designer provided a series of static images of the new ...
0
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1answer
63 views

Logic based on modified fields of a Hibernate entity

I have a Hibernate entity object MyObject with several attributes and a service MyObjectService containing business logic dealing with MyObject. I also have a view model dealing with user input/output ...
0
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1answer
113 views

Common Methods for communication between Offline Software and Web Application?

The purpose/s of this question is to discover what are some of the most reliable methods of achieving communication between existing offline software and a web application. (Example) Scenario: A ...
3
votes
4answers
449 views

How to force “program to an interface” without using a java Interface in java 1.6

In java 1.8 they have wonderful new "default interface methods". In 1.6 how close can we come? The goal: keep clients (using code) from being able to tell that a class is not a java interface. If ...
2
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1answer
230 views

How do you show the exception handler in a class diagram?

I have one exception handler class. I want to show this class in the uml -- class diagram. But, I do not know how to represent relationship between class <X> and exception handler class. How can ...
6
votes
3answers
423 views

Resources for popular domain models [closed]

I have come across many situations where I had to build a system for a library or a clinic or other popular domains. The thing is a domain model for a library was probably done 1000 times already with ...
1
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2answers
248 views

How to present a stable data model in a public API that allows internal data structures to be changed without breaking the public view of the data?

I am in the process of developing an application that allows users to write C# scripts. These scripts allow users to call selected methods and to access and manipulate data in a document. This works ...
3
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2answers
316 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 ...
4
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1answer
77 views

Handling interface segregation in C++

I'm designing a "view" handling system for a game. The goal is to be able to have different "views" that can be shown in sequence or stacked on-top of each other. For example, the initial splash ...
0
votes
3answers
778 views

iOS chat application design, sending/relaying the message over to the end user

I have a design question. Let us say you were tasked with building a chat application, specifically for iOS (iOS Chat Application). For simplicity let us say you can only chat with one person at a ...
0
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0answers
61 views

Database-like structure in memory

I need a database-like structure that will wrap this: data MsgPackDB = MsgPackDB { dim :: !(V.Vector Int) , rows :: !([DBRow]) } data DBRow = ...
2
votes
1answer
99 views

Building a string parser for user command and control?

My goal is to build a command parser that has basic syntax and multiple possible branches at each point. These commands come from users of the system and are text input (no GUI). The basic syntax is ...
0
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1answer
101 views

Static methods vs Interface implementation

Here is my problem: I stared to create a e-commerce web sites info collector. So i created a parser for each site. The parser class is state less. got methods like: getItemPrice(WebElement page) ...
1
vote
1answer
132 views

Why does `SortedDictionary` not implement `IReadOnlyDictionary`?

The .NET type SortedDictionary<TKey, TValue> does not implement the interface IReadOnlyDictionary<TKey, TValue>, although Dictionary<TKey, TValue> does. It is trivial to make ...
3
votes
2answers
194 views

implementing dynamic query handler on historical data

EDIT : Refined question to focus on the core issue Context: I have historical data about property (house) sales collected from various sources in a centralized/cloud data source (assume info ...
0
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1answer
283 views

Email Content creation | Proper design

Working on an E commerce application where we need to send so many email to customer like Registration email Forget Password Order placed There are many other emails that can be sent, I already ...
2
votes
1answer
123 views

How deep is enough to represent an algorithm in UML sequence diagram?

I have three simple classes. LoginController, UsersCatalog and User. UsersCatalog has an array of User. I have to represent a simple process of login. LoginController has a method login(username, ...
3
votes
3answers
363 views

Separating Code into Smaller Files in C

I am in the process of cleaning up my code and making it easier to maintain. I am doing this by turning my 5000+ line file into separate smaller files. I have successfully created separate source and ...
69
votes
7answers
9k views

Should I follow the normal path or fail early?

From the Code Complete book comes the following quote: "Put the normal case after the if rather than after the else" Which means that exceptions/deviations from the standard path should be put ...
1
vote
1answer
97 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 ...
2
votes
2answers
979 views

Building a distributed system on Amazon Web Services

Would simply using AWS to build an application make this application a distributed system? For example if someone uses RDS for the database server, EC2 for the application itself and S3 for hosting ...
1
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1answer
118 views

Progress in PHP web application design [closed]

I have created an easy database-driven web application (with PHP+MySQL). It's written procedurally with a few controllers (index.php) in a few directories and a few template files and one stylesheet. ...
0
votes
1answer
100 views

translating a list of words (word1, word2 and word3) [closed]

We are trying to globalize an application and we have run into a situation where I'm not sure how (of if) we would go about formatting the string for globalization. It's a paragraph explaining ...
3
votes
2answers
136 views

Decision making and maintenance

I'm trying to find an elegant way to implement a decision making algorithm that allow easy maintenance because the conditions for the decision making might change often. I'm going to try and be more ...
2
votes
3answers
218 views

Implementation strategies for atomic counter

I basically have a counter variable that is decremented and frequently polled. There are three options to implement that, that I can think of: Number 1: private volatile int count; public void ...
1
vote
1answer
79 views

When is it acceptable for business logic to be exposed on distributed applications?

When developing applications (for simplicity, use a client-server model) intended to be deployed on customer systems, when it is acceptable to expose business logic outside of compiled code (for ...
0
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1answer
308 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 ...
3
votes
2answers
337 views

Programming by usage

Iv'e been programming for 15 years now and I often read online that it seems like a lot of people will plan out their objects and how they interact and the data they need and that seems to shape the ...
1
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2answers
250 views

Email service or simply abstract email out and call from?

Got a fairly large web application in asp.net using C#. Also have a mobile setup using a common api that we wrote to basically share data across both of our apps using web methods and common classes. ...
10
votes
4answers
711 views

What's wrong in returning hashtable from public method and when does it make sense to do so?

What are the design problems in returning a hashtable from a public method when you want to return multiple items instead of creating a class and returning object of that? If it does have problems ...
0
votes
2answers
155 views

Is this instance of mixing FP and OOP a good design?

I had a strange-feeling pattern come up in some code I was writing. In a project with user accounts, there was a lot of code that needed to do common things such as creating accounts, deleting them, ...
18
votes
4answers
2k views

Is there a good reason to make pure functions non-public?

I had a little debate going on with a coworker. Simply put, is there a good reason to hide/encapsulate functions that are pure? By "pure" I mean the wikipedia definition: Always returns the same ...
-1
votes
0answers
39 views

Clearly defining an Implementation detail [duplicate]

In what way could I, when designing my API, framework or whatever decide what is and what is not an implementation detail? What questions do I ask in order to correctly answer: "Is that something my ...
0
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1answer
72 views

Strategy vs Publiser-subscriber pattern

Let's say I have a channel endpoint where I receive messages. Because I want to process messages in a different way depending on its Header property, rather than create a massive switch I create ...
1
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1answer
143 views

Entity Component System Coupling

Lately I've been working on a small personal project which is basically an Entity Component System framework with autoupdated Systems. While I have a pretty good idea on the way the framework should ...
0
votes
0answers
59 views

Am I following a good design thought process? Is the Abp framework overkill?

As I finish one project and start another, I have a small time window to come up with an architecture for the new. I am coming from the following design: Web applicationReceives domain models & ...
1
vote
1answer
255 views

When creating a library, is there a way to make certain classes entirely internal to the library, and not exposed to the user of the library? [duplicate]

Suppose you were designing a Java library for other people to use. You compile the library into a JAR that they can import into their projects and use. Needless to say, you intend for the library to ...
0
votes
2answers
110 views

API - How to handle scope based functionality?

TLDR; Where and possibly how should I implement scope based logic in the example code? I have got a ASP.NET Web Api. The Api uses OData (on top off REST) for data endpoints and OAuth 2.0 ...
0
votes
1answer
81 views

Properly design program database to reflect organization structure

I'm having trouble setting up my program's database the 'right' way. I was hoping you guys could give me suggestions on doing it properly. I am creating a database+client for a non-profit organization ...
2
votes
3answers
282 views

Which approach is right doing use case first or classes first ? why? [duplicate]

There are people who prefer to do use cases first and then do the classes, but there are also some who prefer to do class diagram first and then use cases. So is it personal choice for convenience? ...
0
votes
0answers
59 views

Is one of these the more “Angular” way of communicating with a directive?

I am working on a project where I would like to encapsulate a directive library and distribute it to other developers to use. I would like to keep the changes to the model within this encapsulated ...
1
vote
1answer
170 views

From a DDD perspective is a report generating service a domain service or an infrastructure service?

Let assume we have the following service whose responsibility is to generate Excel reports: class ExcelReportService{ public String generateReport(String fileFormatFilePath, ResultSet data){ ...
1
vote
1answer
102 views

Java Modal Object Design

This question is not about a specific program. This is about design - the UML phase of the project. I am supervising a Java project. It will contain a lot of modal popup dialogs. From a C/C++ ...
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votes
0answers
37 views

Where should commands be issued from a CQRS application?

Let's say I have a very simple CQRS application for communicating with some Suppliers. I'll upload some Orders to each Supplier's FTP account. I decided for 2 bounded contexts. One for managing ...
4
votes
3answers
319 views

database design, how to handle freelancers

The context i'm modeling a database for a small ERP system. However I've recently hit a difficult spot that I'm having a hard time wrapping my head around. The logic of it involves a few special ...
-1
votes
3answers
942 views

Why is aggregation function bad idea for RESTful? [closed]

As title: Why is aggregation function bad idea for RESTful? Although I know CRUD is good for RESTful. For example, the resource is 'employee', and client needs to retrive sum of total 'salary' of all ...
3
votes
1answer
206 views

Is this caution in Android API documentation an indication of suboptimal design?

The content below is from the Android developer site: According to the phrase it is expecting the developer to store this info in his head. Shouldn't this be simple if they kept only ...
1
vote
1answer
121 views

Are CRUD operations intended to be used with collections?

CRUD operations, by definition are... interfaces that permit users to create, remove, modify or retrieve data Implementations of CRUD interfaces can come in various shapes and sometimes they are ...
11
votes
4answers
677 views

Is it an overkill to wrap a collection in a simple class only for the sake of better readability?

I have the following map: Map<Double, List<SoundEvent>> soundEventCells = new HashMap<Double, List<SoundEvent>>(); This HashMap maps double values (which are points in time) ...