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

Flow


Flow is simply a collection of phases, and the order of phases inside a flow is defined in axis2.xml. As a phase is a logical collection and, which is, in fact, a virtual concept, a flow can be assumed as the execution chain (a collection of handlers). There are four types of flows in Axis2:

  • InFlow: When a message comes in (request message), the message has to go via the InFlow. Then all the handlers in the InFlow will be invoked. InFlow is somewhat different from the OutFlow. A flow consists of two parts. The first part is from the beginning to the dispatcher (up to and including the dispatch phase). The second part will be there only if a corresponding service is found at the end of the dispatch phase. Therefore, the second part of the flow is InFlow of the corresponding operation for the incoming message. So the InFlow consists of a global part and an operation part.

  • InFaultFlow: This flow will be invoked if the incoming request is faulty (request with HTTP status code 500).

  • OutFlow...