Questions tagged [dataflow]
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26 questions
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Is my Level 1 and Level 2 DFD for the "Manage User Account" process correct?
I’m working on a Physical DFD Level 1 and 2 for an anomaly detection app, but this this post only concerns the DFD’s user-account processes. I want to check if my decomposition of a specific process ...
1
vote
2
answers
61
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Do data stores in a Level 1 DFD have to match the tables in the ERD exactly?
We're developing an anomaly detection web app as a Capstone Project, and we're currently revising our manuscript.
In our last capstone defense, one of our panelists mentioned that the data stores in ...
-1
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1
answer
88
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Flow of data in GUI apps
When syncing data between different levels in Swing (or any GUI project, for that matter), what is the right flow of data in that sync chain? Like so?
DB -> Model -> UI
I was trying to implement ...
- 2,030
17
votes
8
answers
5k
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When should a function be given an argument vs getting the data itself?
When is it better to pass data to a function in a parameter, and when is it better for the function to just fetch the data itself?
Here's some simplified examples in PowerShell:
Option 1 (give the ...
- 181
0
votes
1
answer
645
views
Using both websocket and REST for the application requiring two-way communication
I am currently implementing front-end part of the collaborative application requiring two-way live communication between server and the web app. Cloud service responsible for the data exchange will be ...
1
vote
0
answers
147
views
Where should I persist the side effects of actions?
I have a outlining app that I am writing using unidirectional dataflow and some of the concepts from Redux.
When the user has selects items in the outline, and clicks indent, an indent action is fired....
- 89
2
votes
1
answer
260
views
How (whether to?) include Apache Spark in my Architecture
Brief overview of general data flow
The general goal of my system is to allow users to upload many different types of files containing data (PDF, CSV, ZIP, etc.), then index it and perform some basic ...
-1
votes
1
answer
367
views
Do other languages have variables shared between threads?
I guess it would be too complex for Node.js / JavaScript to leverage, but I've been working with clusters in node to break big tasks down so all cores can work at once but the inter-process messaging ...
- 3,833
0
votes
3
answers
688
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Diagram to show how one object "becomes" another?
I am working in a purchasing system where we take calls:
public class Call
{
public List<CallItem> CallItems { get; set; }
}
The calls can be turned into quotes, where call items become ...
- 19
0
votes
0
answers
76
views
Program Simulation Techniques
I've noticed that data-flow analysis uses approximations of a programs steps by simulating the value flow in some way (which I don't fully understand yet). They describe it well here. On page 4 they ...
- 2,787
0
votes
2
answers
143
views
CLI to Aid Versioning of Input, Source, and Output
I'm currently working in an environment where I have the following:
Multiple Inputs (with multiple versions)
Source code to generate output (multiple versions)
Output generated by a combination of ...
4
votes
1
answer
967
views
Is undo and redo possible/feasible with two-way data binding (vs uni-directional data flow)?
I'm developing an experimental application for work that requires fully persistent undos and redos. I decided to use react/redux/immutable JS tech stack to solve this problem because I saw it worked ...
- 240
1
vote
2
answers
123
views
Application design for step by step filling information data flow
Suppose, my application consists of many components, where users need to fill theirs information, something like this:
-Select city
`-Select library
`-Select book
`-... a lot of components like ...
- 341
5
votes
3
answers
405
views
Patterns to allow for versatile data-flow hooks in Javascript
I have an application where I'd like to add ways for external modules/components to hook during the processes and data-flow and perform actions/modify data.
For the first requirement—performing ...
- 440
3
votes
0
answers
533
views
Spark supports cyclic data flow
I read on http://spark.apache.org/ that Spark supports cyclic data flow.
How can data flow be cyclic if the RDDs used by Spark are immutable?
I thought the processing done by Spark looks like an ...
- 173