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  • Book Overview & Buying Play Framework essentials
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Play Framework essentials

Play Framework essentials

By : Julien Richard-Foy
3.6 (8)
Buy this Book
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Play Framework essentials

Play Framework essentials

3.6 (8)
By: Julien Richard-Foy
Buy this Book

Overview of this book

This book targets Java and Scala developers who already have some experience in web development and who want to master Play framework quickly and efficiently. This book assumes you have a good level of knowledge and understanding of efficient Java and Scala code.
Table of Contents (9 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Building a Web Service
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1. Building a Web Service
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Play – a framework used to write web applications
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Bootstrapping a Play application
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URL routing
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Building HTTP responses
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Reading JSON requests
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Summary
2
2. Persisting Data and Testing
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2. Persisting Data and Testing
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Testing your web service
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Persisting data
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Using an in-memory database for tests
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Summary
3
3. Turning a Web Service into a Web Application
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3. Turning a Web Service into a Web Application
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Delta between a web service and a web application
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Using the template engine to build web pages
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Generating HTML forms
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Reading and validating HTML form data
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Handling content negotiation
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Putting things together
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Writing web user interface tests
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Summary
4
4. Integrating with Client-side Technologies
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4. Integrating with Client-side Technologies
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Philosophy of Play regarding client-side technologies
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Serving static assets
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Using the JavaScript reverse router
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Managing assets from the build system
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Summary
5
5. Reactively Handling Long-running Requests
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5. Reactively Handling Long-running Requests
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Play application's execution model
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Scaling up your server
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Embracing non-blocking APIs
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Managing execution contexts
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Writing incremental computations using iteratees
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Streaming results using enumerators
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Manipulating data streams by combining iteratees, enumerators, and enumeratees
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Controlling the data flow
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Summary
6
6. Leveraging the Play Stack – Security, Internationalization, Cache, and the HTTP Client
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6. Leveraging the Play Stack – Security, Internationalization, Cache, and the HTTP Client
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Handling security concerns
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Saving computation time using cache
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Serving content in several languages
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Calling remote web services
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Summary
7
7. Scaling Your Codebase and Deploying Your Application
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7. Scaling Your Codebase and Deploying Your Application
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Making an action's logic reusable and composable with action builders
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Modularizing your code
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Application deployment
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Summary
8
Index
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Index

Streaming results using enumerators

Iteratees make it possible to consume streams of data in a non-blocking way. Conversely, enumerators produce data streams in a non-blocking way. They are useful when you need to send large results, or if your result is built from an intermittent data source. An Enumerator[A] object defines a stream of values of type A.

The simplest way to create an enumerator is to use one of the methods of the Enumerator object. For instance, you can easily convert a java.io.InputStream class or a java.io.File class to an Enumerator[Array[Byte]] object as follows:

import play.api.libs.iteratee.Enumerator
Enumerator.fromStream(inputStream)
Enumerator.fromFile(file)

To send a stream of data as a response body, it is better to explicitly set the Content-Length response header so that the connection can be kept alive to serve further requests. Alternatively, you can use the chunked transfer encoding as follows:

Ok.chunked(Enumerator.fromFile(new File("foo.txt")))

To use the chunked...

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