NoFlo - Flow-Based Programming for Node.js

Flow-Based Programming for Node.js

http://bergie.iki.fihenri.bergius@iki.fi @bergie

Call-Return

Continuation-Passing Style

JavaScript, the Ugly Parts

Promises

How to make your code manageable?

Clean separation of concerns

Visualized connections between components

Flow-based programming“Flow-based programming (FBP) is a programmingparadigm that defines applications as networks of blackbox processes, which exchange data across predefinedconnections by message passing, where the connectionsare specified externally to the processes. These blackbox processes can be reconnected endlessly to formdifferent applications without having to be changedinternally. FBP is thus naturally component-oriented.” - Wikipedia

Flow-based programming

“Flow-Based Programming was invented byJohn Paul Morrison [from IBM] in the early1970s, and an early implementation of thistechnology has been in continuous productionuse at a major Canadian bank since that time.” - Wikipedia

Softwarearcheology?

“This is the Unix philosophy: Write programsthat do one thing and do it well. Writeprograms to work together. Write programsto handle text streams, because that is auniversal interface.” - Doug McIlroy

“I thought of objects being like biologicalcells and/or individual computers on anetwork, only able to communicate withmessages (so messaging came at the verybeginning -- it took a while to see how to domessaging in a programming languageefficiently enough to be useful).” - Alan Kay

send options a, u & x to command ps,send option firefox to command grep direct standard output of ps to grep

NoFlo components

Using NoFlo in your Node.js app

DSL for specifying flows

DSL for specifying flowssend string package.json to source port of Read send output of Read to Split (by lines) send output of Split to Count send output of Count to Display

NoFlo shell

NoFlo in integration email External partners CouchDB + CouchApp Project NoFloController External systems github.com/iks/proggis

NoFlo in integrationgithub.com/iks/proggis

NoFlo in real world

What happens next?● Web-based drawing ● Hook.io support● Web-based ● Component loading monitoring & debug from NPM

Flow-Based Programming, the book amzn.com/1451542321

Flow-Based Programming for Node.jsgithub.com/bergie/noflo

github.com/bergie/noflo Screenshot: github.com, couple of weeks ago

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NoFlo - Flow-Based Programming for Node.js

by Henri Bergius

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