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

Request session scope


Request session scope is the default session scope in Axis2. When we deploy a service without knowing anything about session management, our service will be deployed in the request session scope. The lifetime of this session is limited to the method invocation lifetime or the request processing time. When we deploy a service in the request scope, it simply means that we are not going to worry about the session management at all. So it is like having no session management.

Once we deploy a service in the request session scope, for each and every invocation, a new service implementation class will be created. Say we have to deploy a service called Foo in the request scope; then if a client invokes the service ten times, 10 instances of the service class will be created.

If we want to specify the scope explicitly, we can still do that by adding a scope attribute to the service element in services.xml, as follows. However, as mentioned earlier, deploying a service in the...