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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

Managing execution contexts

Because Play uses explicit concurrency control, controllers are also responsible for using the right execution context to run their action's code. Generally, as long as your actions do not invoke heavy computations or blocking APIs, the default execution context should work fine. However, if your code is blocking, it is recommended to use a distinct execution context to run it.

An application with two execution contexts (represented by the black and grey arrows). You can specify in which execution context each action should be executed, as explained in this section

Unfortunately, there is no non-blocking standard API for relational database communication (JDBC is blocking). It means that all our actions that invoke code executing database queries should be run in a distinct execution context so that the default execution context is not blocked. This distinct execution context has to be configured according to your needs. In the case of JDBC communication, your execution...

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Tech Concepts
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Programming languages
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