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  • Book Overview & Buying Mastering play framework for scala
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Mastering play framework for scala

Mastering play framework for scala

By : Saxena
3.2 (10)
Buy this Book
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Mastering play framework for scala

Mastering play framework for scala

3.2 (10)
By: Saxena
Buy this Book

Overview of this book

This book is intended for those developers who are keen to master the internal workings of Play Framework to effectively build and deploy web-related apps.
Table of Contents (15 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. Getting Started with Play
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1. Getting Started with Play
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Venturing into the world of Play
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Summary
2
2. Defining Actions
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2. Defining Actions
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A dummy Artist model
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Actions
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Request body parsers
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Extending a parser
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Exploring the results
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Asynchronous Actions
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Content negotiation
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Filters
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Action composition
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Troubleshooting
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Summary
3
3. Building Routes
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3. Building Routes
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Introduction to Play routes
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Reverse routing
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Assets
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Configuring route definitions
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Configuring request parameters
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Troubleshooting
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Summary
4
4. Exploring Views
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4. Exploring Views
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Diving into Scala templates
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Generating forms
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Internationalization
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Scala templating in Play
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Troubleshooting
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Summary
5
5. Working with Data
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5. Working with Data
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Introducing models
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JDBC
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Anorm
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Slick
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ReactiveMongo
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The Cache API
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Troubleshooting
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Summary
6
6. Reactive Data Streams
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6. Reactive Data Streams
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Basics of handling data streams
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Iteratees
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Enumerator
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Enumeratees
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Summary
7
7. Playing with Globals
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7. Playing with Globals
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GlobalSettings
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The life cycle of an application
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The request-response life cycle
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Summary
8
8. WebSockets and Actors
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8. WebSockets and Actors
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An introduction to WebSockets
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WebSockets in Play
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Actor Model
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Introducing Akka Actors
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WebSocket using Iteratee
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WebSocket using Actors without Iteratees
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Closing a WebSocket
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Troubleshooting
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Summary
9
9. Testing
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9. Testing
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The setup for writing tests
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Unit testing
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Dissecting PlaySpecification
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Unit testing a controller
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Functional testing
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Summary
10
10. Debugging and Logging
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10. Debugging and Logging
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Debugging a Play application
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Experimenting in a Scala console
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Logging
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Play's logging API
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Log configuration in Play
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Summary
11
11. Web Services and Authentication
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11. Web Services and Authentication
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Calling web services
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OpenID
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OAuth
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Summary
12
12. Play in Production
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12. Play in Production
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Deploying a Play application
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Configuring for production
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Enabling SSL
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Using a load balancer
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Troubleshooting
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Summary
13
13. Writing Play Plugins
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13. Writing Play Plugins
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Plugin definition
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Plugin declaration
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Exposing services through plugins
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Tips for writing a plugin
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Summary
14
Index
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Index

Using a load balancer

Websites that deal with huge traffic generally use a technique called load balancing to improve the availability and responsiveness of applications. A load balancer distributes incoming traffic among multiple servers hosting same content. The distribution of load is determined by various scheduler algorithms.

In this section, we will see how to add a load balancer in front of our application servers (assuming that they are running on the IPs 127.0.0.1, 127.0.0.2, and 127.0.0.3 on the port 9000) using different HTTP web servers.

Apache HTTP

The Apache HTTP server provides a secure, efficient, and extensible server that supports HTTP services. The Apache HTTP server can be used as a load balancer through its mod_proxy and mod_proxy_balance modules.

To use Apache HTTP as a load balancer, mod_proxy and mod_proxy_balancer have to be present in the server. To set up the load balancer, all we need to do is update /etc/httpd/conf/httpd.conf.

Let's update the configuration...

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Tech Concepts
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Programming languages
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