Data Driven DesignBuild app design around dataflow rather than program flow

Max KlymyshynCTO at GVMachines

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What's the problem?

Handling many of different data sources and keep context

Typical task for this approach

Random picture from Google

Yup, honestly it's depend on the task.

There's a lot of examples of data-driven programming around.

The most known example isDjango Middleware

Really?

So, let's go deeper

Data Drivenprogramming

definition

Data driven programming is a programming model where

the data itself controls the flow of the program and not the program logic

What is Data Driven programming

Data Driven definition is quite strict.

Typically it's mixed with other approaches

Not so strict

Real world tasksample usage

I want to grab weather from different sources and display only sunny days of the month

Show only sunny days in the month

To grab data we should define pipeline - the way our data going to go

Pipeline

Pipeline

Grab Parse Validate Display

In detailsGrab

Parse

Fetch data from weather.com

Fetch data from pogoda.yandex.ua

Fetch data from weather.yahooapis.com

Parse weather.com

Parse pogoda.yandex.ua

Parase api.aerisapi.com

Validate Pass sunny days only

At this moment we have only sunny days to display

Pipeline

Approacheswhen this may be be effective?

ifttt.comifttt is a web service platform that connects various web services together to automate common tasks on the web

If this then that

When you have a lot of mostly similar data from different sources

You need to keep only data which matters for you

Various sources

In case you need to generate a lot of similar data sets filtered by many of params

Data slices generation

In general, approach is the same as usage of UNIX pipes:

cat file.dat | grep something | sed 's/xxx/yyy/g'

Pipes

Summary

Grab Parse Validate Display

https://github.com/joymax/data-driven-design

Example

That's all, thank you.

Questions?

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Github: joymax