PowerPoint Presentation

Knoldus Software LLP

Using WebSockets In Play!

Neelkanth Sachdeva Software Consultant

neelkanthsachdeva.wordpress.com

Agenda

Short Polling

Long Polling

WebSockets

Websockets with Play !

The Play Chat Application Using Wesockets

Short Polling

Drawbacks :Resource Intensive

Slow Even Very Slow

One Request / One Response

Long Polling

Drawbacks :- Half Duplax- Again one request / one response

Whats our probelm

Lots of incoming messages

Websockets

WebSocket Features & Limitations

Features :Full duplax communication

Real time messages

Efficient & FastDrawbacks :

Available with newer browsers

Using Websockets with Play !

Producer

Consumer

Using Websockets with Play !

Producer

Consumer

Enumerator

Iteratee

Iteratees

The Consumer

Consumes chunks from Producer

Enumerator

The Producer

- Produces typed chunks

- Only produces if consumer is there.

At Server :

Creating a websocket connection needs a Producer (Enumerator) & a Consumer (Iteratee)

At Client :Creating a socket connection.

var socket = new WebSocket(ws://localhost:9000)

The Events - onmessage- onopen- onclose

Understand it through play sample chat application available here :

https://github.com/playframework/playframework/tree/master/samples/scala/websocket-chat

Cheers !