Questions tagged [design]

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

347 questions with no upvoted or accepted answers
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votes
2answers
410 views

Implementing new project to communicate with old ones. The correct way

I'm not sure if this is the right place to post this (I'm fairly new, but Stackoverflow and Superuser suggested this site for my question), but here goes. I currently have the following: A frontend -...
6
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2answers
2k views

Loose Coupling Presenter to View in MVP

We work in a Java shop here and our web application uses an implementation of the MVP architectural pattern. Our manager comes from a .NET world, where he has been exposed to the MVVM design pattern. ...
4
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0answers
116 views

Global variables and common block management in Fortran

Background The high level overview of my situation is described here. I am breaking it apart into smaller, specific questions, such as this one, regarding extensive use of global variables in a ...
4
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0answers
405 views

How should a non-React component subscribe and respond to Redux state changes?

I’m new to React/Redux tools and still figuring out some idiomatic design patterns. Here's a scenario: A user adding a place marker 📍 (that has some associated metadata) to an interactive map (...
4
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0answers
60 views

Designing a test system on server/message level for large legacy application

I am working on introducing tests to an old system. Because of the amound of technical debt, we have landed on component/interface testing. The system is a servies of servers which sends messages in ...
4
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0answers
196 views

Best design pattern/approach for a Factory which needs multiple types of input

I want to develop a Factory of INotifications. public interface INotification { string Text { get; } string UserId { get; } NotificationType NotificationType { get; } } The problem is, ...
4
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0answers
584 views

Symfony2 - Best aproach for a plugin system

Symfony2 is handling all its things in bundles in /app or in /vendor. This is fine if you are handling and managing all by yourself or Ops that handle all needed things. But I haven't found a good ...
4
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0answers
637 views

What are the benefits of an input/output component design?

For the company I work at, all of our projects, including a new one started last year, are written in C89. We write for vxWorks (a real time embedded operation system). Our software runs multi-...
4
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0answers
1k views

Architecture design for Java servlet that triggers work (for sending push notifications)

I'm designing a push notification server (for pushing notification via APNS and Google servers) and have come up with the following design for a Java based web application server. I would really like ...
4
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3answers
5k views

Designing a Feed and Notification system in MongoDB

I'm developing a NodeJS API that will be consumed, for now, by an Android app. I need 2 important things here: a News Feed and a Notification system. And I need it to be scalable. I'm using ...
3
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0answers
69 views

Choosing the design of a scientific DSL: purely or impurely functional?

My aim is to create a language specific to the scientific field (which would be used mainly in the field of machine learning and physics) which would be based on the functional paradigm, a paradigm ...
3
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0answers
51 views

Designing a filtering function

This question is not so much about how to implement a solution as I've already implemented a working solution, but more about how to improve how I implemented it. The implementation process of the ...
3
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0answers
104 views

Technical architecture of platform on .Net Core

I'm designing a platform that will run robots developed by others. Basically anyone could implement a IAutonomousAgent and register the implementation on the platform. At runtime, the platform will ...
3
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3answers
682 views

Do I use Repository or Service Object to Perform Logging?

I'm working in Java Spring, and I have typical service and repository layers. The repository grabs a JSON; passes it along to the service; service maps the repository response to a DTO. I also need ...
3
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0answers
34 views

How Best To Store Data Structures Around Flow

I'm working on building a simulator for HVAC units. The conceptual model I am working with is basically that an HVAC unit has inputs and outputs, and I need to be able to calculate the outputs for a ...
3
votes
1answer
208 views

track user actions on UI and store them in the database

I have the web application that provides user with the interface to edit its character. When user makes some changes and saves them, I store it as delta in MongoDB. UI and backend communicate via REST....
3
votes
1answer
748 views

How to (or should I) refactor RxJS nested subscriptions with intermediate return value?

I hope this fits more here than SO because it is mostly about code design than making it work. Also, this is not tied to RxJs, but more to the reactive paradigm. (TypeScript tag is only added to make ...
3
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0answers
558 views

Is this an example of cyclic dependency?

I'm an undergraduate student and I have this assignment on a Discrete Event simulator. Currently I have completed to the end of v1.2 here. Attached also, is an algorithmic overview. I have wrote my ...
3
votes
1answer
78 views

What are some design ideas for a data mapping and transformation application?

Here is a high level outline of the project: We frequently need to convert data from a new incoming system to our in house system (sort of a basic ETL process) We would prefer to do this dynamically, ...
3
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0answers
76 views

Memento and releasing resources

Let's suppose we have a class whose state has to be saved and later restored, and we resorted to the Memento pattern for that. What if the state includes resources that have to be explicitly ...
3
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0answers
154 views

Should I build a custom text editor from scratch or enhance existing ones?

I'm developing a Windows WPF app that needs to edit a certain type of document and I need a highly customized editor to do so: The text is a transcription of an audio feed, and I need to sync the the ...
3
votes
2answers
412 views

How to avoid points of critical failure?

Background We have a ton of GPS devices in vehicles. These devices need to communicate with our system. To achieve this, we need to parse the device's messages before proceeding. The following ...
3
votes
0answers
52 views

Layer below Service and NetworkingManager to handle received data

I'm in the early stages of building a cryptocurrency tracking app for iOS and looking for a scalable design. My question specifically relates to the element of the app which retrieves data from an API ...
3
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0answers
161 views

How do large scale permission systems work with membership expansion?

Let's say you have a permission system with which you can specify things like: user U is a member of group A, which is a subgroup of group B, which is a subgroup of group C, and all members of group C ...
3
votes
1answer
277 views

Designing database job monitoring

I have several Oracle database where my in-house applications are running. Those applications use both dba_jobs and dba_scheduler_jobs. I want to write monitoring function: check_my_jobs which will ...
3
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0answers
240 views

Submitting to a leaky-bucket service: Keep track of bucket level myself or use quota data in response

I'm designing software that will connect to a remote service and send it requests from a local application. This remote service implements a leaky-bucket algorithm to determine whether to process the ...
3
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0answers
400 views

Redis set of sets - Is there a better Design?

I have a telegram bot that alerts whenever a price of certain asset reach a certain price. I have the following table in a DB: AlertId ChatId Price Asset So each Asset will have several ChatId (...
3
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0answers
130 views

What are good ways to represent "requirements" and "cannot-have" connections?

In the context of creating an ecosystem, the graph below reveals information about it's behavior. Dot : A node with the entity's name. There's a tree, grass, a fern, etc. Blue arrow : A requirement. ...
3
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0answers
290 views

When designing an activity-based authorization system, how should additional conditional checks be handled?

When designing an activity-based authorization system, how should additional conditional checks be handled? For example, I have the following authority: VIEW_COMPANY_TRANSACTIONS which allows the ...
3
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0answers
66 views

Sharing tasks among parallel independent jobs

I am getting files on HDFS and I have a legacy java app which checks for new files every 15 mins, does some transformations and write them to some remote server. Now, I am facing scaling issue with ...
3
votes
0answers
419 views

Designing clickstream analysis?

I have a application where user purchases/click the certain products. I need to design the click stream analysis here which product got clicked how many number of time, user/geographical detail click ...
3
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0answers
68 views

Handling frequent simultaneous updates in real time

I have seen similar questions and answers here but my situation is a bit different from those. I am building an application which gives users infinite canvas space to draw something. The canvas space ...
3
votes
1answer
307 views

How to set up a sql database to cater for user records, group records and default records?

Outline I have an application that loads data from a database. I'm not talking about client data here though, I'm talking about application configuration. The database will therefore come with some ...
3
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0answers
703 views

Web application logging strategy

Basically: I am creating an enterprise web application. I would like to do extensive logging of both client and server activity, with all logs ultimately stored on the server. I have found many ...
3
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0answers
1k views

How should I store user activities in ElasticSearch and figure out popular searches?

I've got java logging user activities to Fluentd, Fluentd is then writing these activities into an elasticsearch index. Every user activity is recorded, some include: User1 follows user2 User1 likes ...
3
votes
0answers
507 views

Understand the service term in DDD and matching class diagram

I m trying to learn how to make my code better. This way, I try to learn some books and understand them. I m having some troubles dealing with Domain Objects. From the first year of my IT school, I'...
3
votes
0answers
84 views

Architecture and implementation of a de-centralised web service

I'm a web programmer with several years of experience in RoR and node.js. I have a project idea that is quite big and I need some input in how it can be achieved. I heard of the Diaspora project, and ...
3
votes
0answers
912 views

How to model an Admin View on a ReST API

We have a more or less "typical" ReST API that allows clients to interact with a bunch of resources, let's say Maps and Devices. An authenticated client can get a list of maps, it can download a map, ...
3
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0answers
148 views

Should I strictly follow restful guidelines

I have the following resources in my Asp.net web API: route: consisting of the following relevant properties arrival_location_id leaving_location_id and location: id name coordinates The thing is,...
3
votes
0answers
760 views

How to design microservices without leader election but job scheduling?

There is a microservices system that is currently using Zookeeper. Let's assume there is just one type of service A that exhibits a simple read of some value t. However, the one of existing A ...
3
votes
0answers
92 views

Designing a web based smart card publisher

I'm working on an application that's supposed to have a web based GUI where you can insert some data. That data will be saved in persistent storage and a hex number generated and stored alongside. ...
3
votes
0answers
67 views

Should my application call statsd directly or should I call statsd based off logs?

I'm planning on incrementing counters in statsd based of various events within my application. I have logging in place for these events. So, from my viewpoint I have two options: Update the ...
3
votes
0answers
1k views

Analysis of ways to control/refresh a directive with isolated scope from parent controller

I'm asking this question because there doesn't seem to be a "recommended" approach for this. If a page had a directive with isolated scope, and if the directive needs to update itself after an event ...
3
votes
0answers
754 views

The Python module-as-singleton hack

I've seen (and once used) this idiom a few times in Python: # At the end of a module: if __name__ == '__main__': main() # or whatever your entry point looks like, this line isn't important else: ...
3
votes
0answers
165 views

Should I inject a data dependency into an Angular Directive?

I am currently implementing an AngularJS directive. It is fundamentally a reusable widget comprised of a select box and a table which populates based on the item in the select box. My point of ...
3
votes
0answers
526 views

How can I put multiple hierarchical forms in a single web page and avoid making it a mess?

We are a group of developers working on a web application that accepts forms filled and sent by our users and present it in an overall view. Our main form view looks like this: There are multiple ...
3
votes
0answers
379 views

JS closures - Passing a function to a child, how should the shared object be accessed

I have a design and am wondering what the appropriate way to access variables is. I'll demonstrate with this example since I can't seem to describe it better than the title. Term is an object ...
3
votes
0answers
89 views

Pattern for data types that are related yet fundamentally different in utility

Background I'm currently working on a codebase for what is to become a forthcoming website's content "engine", where it will take in different types of standardized data (implemented with XML), parse ...
3
votes
0answers
181 views

What are some important considerations when developing a DBaaS (DataBase as a Service)

I'm interested in creating a Database as a Service. I want users of the service to be able to do a few seemingly not very simple things. Sign up and be given access to a JSON datastore that they can ...
3
votes
1answer
129 views

How to model workflows

I'm building a helpdesk-type system, where there are: Customer - can submit/resubmit tickets; Manager - can review submitted tickets, assign to developers (one ticket to multiple developers), review ...

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