Book Image

Apache Axis2 Web Services, 2nd Edition

By : Deepal Jayasinghe, Afkham Azeez
Book Image

Apache Axis2 Web Services, 2nd Edition

By: Deepal Jayasinghe, Afkham Azeez

Overview of this book

<p>Web services are gaining popularity and have become one of the major techniques for application integration. Due to the flexibility and advantages of using web services, you want to enable Web service support to your applications. This book is your gateway to learning all you need to know about the Apache Axis2 web service framework and its hands on implementation. <br /><br />Apache Axis2 Web Services, 2nd Edition is your comprehensive guide to implementing this incredibly powerful framework in practice. It gives you precisely what you need to know to develop a detailed practical understanding of this popular, modular and reliable web service framework.<br /><br />This book starts with a short and relevant introduction about the Axis2 1.5 framework and then plunges you straight into its architectural model.</p> <p>Learn to use and develop your own modules. Write a services.xml file so efficiently that you'll be creating more complex applications (rather than just POJOs) in no time.</p> <p>Learn how straightforward it really is to turn a Java class into a web service in Axis2. Experiment with different types of sessions in Axis2. Learn different patterns of Enterprise deployment. Ensure reliability in your web service - a major concern in most enterprise applications - with minimum impact on performance.<br /><br />This book will journey you through all this and more, giving you exactly what you need to learn Axis2 1.5 in the easiest way possible and create secure, reliable, and easy-to-use web services efficiently and systematically.</p>
Table of Contents (22 chapters)
Apache Axis2 Web Services
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
15
Building a Secure Reliable Web Service
Index

Stateless nature of Axis2


As we know by now, Axis2 architecture keeps logic and data separate. In the meantime, Axis2 has two types of data models— static data and runtime data . We have already discussed these in detail. In this chapter, we will discuss more about Axis2 dynamic data hierarchy because session management fully depends on the runtime data. The samples in this chapter will help you understand more about runtime and static data, and most importantly, where to use what.

In Axis2 framework, each individual component is said to be stateless. In other words, service implementation class or handlers should not try to store any local variable. Having stateless instances provides better support to reduce the concurrency control issues; this is due to the race conditions. In Axis2 handlers, MessageReceivers, TransportSenders , TransportReceivers , and even AxisEngine , are said to be stateless. So they do not keep any state in those classes. As a result of that, we do not mind whether...