Book Image

Enterprise Application Development with Ext JS and Spring

By : Gerald Gierer
Book Image

Enterprise Application Development with Ext JS and Spring

By: Gerald Gierer

Overview of this book

Spring and Ext JS are cutting edge frameworks that allow us to build high performance web applications for modern devices, that are now consuming data at a faster rate than ever before. It is the appropriate time for you to understand how to best leverage these technologies when architecting, designing, and developing large scale web development projects. This practical guide condenses an approach to web development that was gained from real world projects, and outlines a simple, practical approach to developing high performance, and enterprise grade web applications. Starting with configuring Java, NetBeans, and MySQL to prepare your development environment, you will then learn how to connect your NetBeans IDE to the MySQL database server. We will then explore the Task Time Tracker (3T) project database structure and populate these tables with test data. Following on from this, we will examine core JPA concepts after reverse engineering the domain layer with NetBeans. Leveraging the Data Access Object design pattern, you will learn how to build the Java DAO implementation layer assisted by generics in base classes, followed by a Data Transfer Object enabled service layer to encapsulate the business logic of your 3T application. The final chapters that focus on Java explore how to implement the request handling layer using Spring annotated controllers, and deploy the 3T application to the GlassFish server. We will then configure the Ext JS 4 development environment and introduce key Ext JS 4 concepts, including MVC and practical design conventions. Covering a variety of important Ext JS 4 strategies and concepts, you will be fully-equipped to implement a variety of different user interfaces using the Ext JS MVC design pattern. Your journey ends by exploring the production build and deployment process using Maven, Sencha Cmd and GlassFish.
Table of Contents (22 chapters)
Enterprise Application Development with Ext JS and Spring
About the Author
About the Reviewers
Introducing Spring Data JPA

Exercise – a simple change request

This simple exercise will again demonstrate the power of generics. Each record inserted into the database should now be logged at using with the message:

The "className" record with ID=? has been inserted

In addition, records that are deleted should be logged using logger.warn() with the message:

The "className" record with ID=? has been deleted

In both cases, the ? token should be replaced with the ID of the entity being inserted or deleted while the className token should be replaced with the class name of the entity being inserted or deleted. This is a trivial change when using generics, as the code can be added to the persist and remove methods of the GenericDaoImpl class. Without the use of generics, each of the CompanyDaoImpl, ProjectDaoImpl, TaskDaoImpl, UserDaoImpl, and TaskLogDaoImpl classes would need to have this change made. When you consider that enterprise applications may have 20, 30, 40, or more tables represented in the DAO layer...