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Play Framework essentials

You're reading from   Play Framework essentials An intuitive guide to creating easy-to-build scalable web applications using the Play framework

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Product type Paperback
Published in Sep 2014
Publisher
ISBN-13 9781783982400
Length 200 pages
Edition 1st Edition
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Author (1):
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Julien Richard-Foy Julien Richard-Foy
Author Profile Icon Julien Richard-Foy
Julien Richard-Foy
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Table of Contents (9) Chapters Close

Preface 1. Building a Web Service 2. Persisting Data and Testing FREE CHAPTER 3. Turning a Web Service into a Web Application 4. Integrating with Client-side Technologies 5. Reactively Handling Long-running Requests 6. Leveraging the Play Stack – Security, Internationalization, Cache, and the HTTP Client 7. Scaling Your Codebase and Deploying Your Application Index

Manipulating data streams by combining iteratees, enumerators, and enumeratees


Well, that's enough concepts for now. Let's put this in practice by implementing a new feature in our shop application: an auction room.

The idea is to allow multiple users to bid for an item of the shop in a room where all connected users instantly see the bids of others, as depicted in the following screenshot:

An auction room for the item Play Framework Essentials. The prices offered by Alice and Bob are followed by the form at the bottom where users can make new offers

Unidirectional streaming with server-sent events

In order to instantly send a notification to all the users of an auction room when one makes a bid, we have to provide an HTTP endpoint streaming these events. We can achieve this using server-sent events. Thus, we have at least two endpoints: one to make a bid and one to get the stream of bid notifications. We actually need a third endpoint to get the HTML page showing an auction room (illustrated...

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