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Oracle Service Bus 11g Development Cookbook

You're reading from   Oracle Service Bus 11g Development Cookbook

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Product type Paperback
Published in Jan 2012
Publisher Packt
ISBN-13 9781849684446
Length 522 pages
Edition 1st Edition
Languages
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Toc

Table of Contents (19) Chapters Close

Oracle Service Bus 11g Development Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
1. Creating a basic OSB service 2. Working Efficiently with OSB Artifacts in Eclipse OEPE FREE CHAPTER 3. Messaging with JMS Transport 4. Using EJB and JEJB transport 5. Using HTTP Transport 6. Using File and Email Transports 7. Communicating with the Database 8. Communicating with SOA Suite 9. Communication, Flow Control, and Message Processing 10. Reliable Communication with the OSB 11. Handling Message-level Security Requirements 12. Handling Transport-level Security Requirements Index

Using custom XPath functions


In this recipe, we will show how to implement custom XPath functions, which extends the collection of XPath functions available with the OSB platform. We will use the same functionality that we used in the Using the Java Callout action to invoke Java code recipe, but now make the calculate checksum functionality available as an XPath function.

Getting ready

You can import the OSB project containing the base setup for this recipe into Eclipse OEPE from \chapter-9\getting-ready\using-custom-xpath-function.

How to do it...

First we have to create the Java functionality we like to expose as a custom XPath function. We will reuse the same Java class we used in the Using the Java Callout action to invoke Java code recipe which is shown here:

package osbcookbook.util.checksum;

import java.util.zip.CRC32;
import java.util.zip.Checksum;

public class ChecksumUtil {
  public static long calculateChecksum(String data) {
    Checksum checksum = new CRC32();
    checksum.update...
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