How to: Get filename from ESB adaptor

Oracle ESB provides header functions that allows designers to access inbound and outbound header functions. The following are the functions available.

1. String getRequestHeader(String xpathExpression,String namespaceDecl)
2. void setOutboundHeader(String xpathExpression,String value, String namespaceDecl)
3. String getInboundResponseHeader(String xpathExpression,String namespaceDecl)
4. void setResponseHeader(String xpathExpression,String value, String namespaceDecl)
Where,
xpathExpression : XPath expression to get/set
value : value to be set for the xpathExpression
namespaceDecl : namespace declarations in the form ‘prefix=namespace;’


You can use the following code snippet in your transformation xslt to get the name of the file that is read by the file adaptor in ESB.

<xsl:variable name="GET_INFILENAME" select="ehdr:getRequestHeader('/fhdr:InboundFileHeaderType/fhdr:fileName',
'fhdr=http://xmlns.oracle.com/pcbpel/adapter/file/;')"/>

How to set the name of the file dynamically during transformation time in ESB fileAdaptor

Oracle ESB provides header functions that allows designers to access inbound and outbound header functions. The following are the functions available.

1. String getRequestHeader(String xpathExpression,String namespaceDecl)
2. void setOutboundHeader(String xpathExpression,String value, String namespaceDecl)
3. String getInboundResponseHeader(String xpathExpression,String namespaceDecl)
4. void setResponseHeader(String xpathExpression,String value, String namespaceDecl)
Where,
xpathExpression : XPath expression to get/set
value : value to be set for the xpathExpression
namespaceDecl : namespace declarations in the form ‘prefix=namespace;’


You can use the following code snippet in your transformation xslt to set the name of the file that is about to written by the ESB File adaptor. This overrides the name given in the design time.

<xsl:variable name="SET_OUTFILENAME"
select="ehdr:setOutboundHeader('/fhdr:OutboundFileHeaderType/fhdr :fileName', $GET_INFILENAME, 'fhdr=http://xmlns.oracle.com/pcbpel/adapter/file/;')"/>

The variable GET_INFILE is the name of the input file name as referred in the previous post.
If you like an example project, you can download it from oracle site here The sample project is under HeaderSupportDemo folder.

How to get the name of an ESB instance in transformation

A new XPath function was added in Oracle 10.1.3.3 to get instance IDs. If you are running an older version you have to upgrade to get this working. One note of caution is, after making the edits to your xslt, the designer view will not work. This is a limitation of jDeveloper.
Here is an example on how to get the instance id in the transformation.

1. Define a simple ESB project and define a simple File Adapter.
2. Perform a transformation in the routing service.
3 Perform the following steps to get the instance ID:

a. Go to Design View.
b. Select Advanced Functions in the Component Palette.
c. Select xpath-expression and drag it to the middle column.
d. Double-click the function icon.
e. Enter ehdr:getInstanceID() in the XPath Expression field.
f. Click OK

4. Click Yes when prompted with a warning.
5. Map the function to the InstanceID element and save the project.
6. Return to the routing service where the XSL transformation activity is defined.
7. Double-click the routing service.
8. Expand the Properties section and add the following property:
Map the function to the InstanceID element and save the project.
6. Return to the routing service where the XSL transformation activity is defined.
7. Double-click the routing service.
8. Expand the Properties section and add the following property:(Note this property is case sensitive.)

enableAccessBusinessEvent=true

9. Save and deploy the project.