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Build Functional Reactive Applications with Elm, Node.js and Infinispan
Galder Zamarreño Arrizabalaga 25th April 2017
Moi
• @
• Infinispan developer & co-founder
•Polyglot programmer
•Functional programming
@galderz
#infinispan
Learn How To Build Functional Reactive Apps
Functional reactive apps
Apps constructed using
Functional Reactive Programming (FRP)
principles
Functional Reactive Programming
is
Abstract
defining FRP
•What is FRP? •Definition
•Why is FRP interesting? •Usefulness
what is FRP?
Composable, declarative way of
programming with
values changing over time
functional
input => combinators => output
Functional + Reactive
event + state → transform
→ state and/or event
Why is FRP interesting?
Composability: easier to reason Asynchronous by default
Efficiency++
how to build frp apps?
HTTP TCP/IP
Elm
HTTP
TCP/IP
statically compiled
Elm
HTTP
TCP/IP
statically compiled
building web user interfaces
Elm
HTTP
TCP/IP
statically compiled
building web user interfaces
promotes FRP
Elm
HTTP
TCP/IP
statically compiled
building web user interfaces
promotes FRP
compiles to fast
Javascript
Elm
HTTP
TCP/IP
statically compiled
building web user interfaces
promotes FRP
compiles to fast
Javascript
most helpful compiler
Elm
HTTP
TCP/IP
statically compiled
building web user interfaces
promotes FRP
compiles to fast
Javascript
most helpful compiler
no runtime
exceptions
Node.js
HTTPTCP/IP
based on express.js
Node.js
HTTPTCP/IP
based on express.js
FRP friendly (async, events)
Node.js
HTTPTCP/IP
based on express.js
FRP friendly (async, events)
stateless, listens on port 3000
Node.js
HTTPTCP/IP
based on express.js
FRP friendly (async, events)
stateless, listens on port 3000
talks binary to data grid
infinispan
HTTPTCP/IP
in-memory data grid
infinispan
HTTPTCP/IP
in-memory data grid
open source
(ASL2)
infinispan
HTTPTCP/IP
in-memory data grid
open source
(ASL2)3 server node
domain
infinispan
HTTPTCP/IP
in-memory data grid
open source
(ASL2)3 server node
domain
2 copies redundant
infinispan
HTTPTCP/IP
in-memory data grid
open source
(ASL2)3 server node
domain
2 copies redundant
Java, Node.js, C/C++... clients
infinispan
HTTPTCP/IP
in-memory data grid
open source
(ASL2)3 server node
domain
2 copies redundant
Java, Node.js, C/C++... clients
remote event
listeners
Elm ArchitectureElm Runtime
Model
Html + Msg (Click) update
Msg (Click) + Model
Cmd e.g. http call…Msg (Http Resp) + Model
Model updated
Model
view
… button click …
Demo: Fetch Talks (1)
GET /events
Demo: fetch Talks (2)
GET /events
iterate
event 1
event 2
…
Demo: fetch Talks (3)
GET /events
iterate
event 1
event 2
…JSON event[]
Demo: Fetch Talks
Demo: insert Talk (1)
POST /events
demo: insert Talk (2)
POST /events
putIfAbsent
demo: insert Talk (3)
POST /events
putIfAbsent
true/false
createdevent
demo: insert Talk (4)
POST /events
putIfAbsent
true/false
createdevent
JSON true/false
WS: JSON event
WS: JSON event
demo: insert Talk
Elm limitations
• typeclasses → +boiler plate code •dictionary type
•Less FRPy version 0.17+ • Interacting with complex Javascript libraries
•Alternative: Purescript (+complex)
Learn How To Build Functional Reactive Apps
what is FRP
Learn How To Build Functional Reactive Apps
what is FRP
why FRP is useful
Learn How To Build Functional Reactive Apps
what is FRP
why FRP is useful
how to build an FR app
Learn How To Build Functional Reactive Apps
what is FRP
why FRP is useful
how to build an FR app
live coding an FR app
creditsApprove by Aha-Soft from the Noun Project
Window by Oleg Frolov
from the Noun Project
Server Error by Montu Yadav
from the Noun Project
Databases by Oliviu Stoian
from the Noun Project
demo link
github.com/galderz/infinispan-events/tree/early17
Thanks
•elm-lang.org
• infinispan.org
•redhat.com/en/technologies/jboss-middleware/data-grid
