Custom Filename for ESB FileAdapter Write

Question

Hi,
I have a ESB service that monitors and deqeues from the oracle.apps.po.event.xmlpo business event via the Oracle Applications adapter. This works fine as the WF_EVENT_T schema is routed via an XSL to a custom XML which is used later.
However, I want the file to use a custom filename with the file adapter. In principle I know how to do this using the ehdr:setOutboundHeader functionality and have got this to work when setting a static filename.
However, I want to be able to create the filename based on the Purchase Order Number coming from the WF_EVENT_T schema. It seems that the ehdr:setOutboundHeader function has to be set before any of the XML Template matches, which means at this point the Purchase Order number is not available. Below is the main parts of the XSL.
<xsl:variable name="CustomFilename" select="'/ns2:PONo"/>
<xsl:variable name="AssignFilename"
select="ehdr:setOutboundHeader('/ns1:OutboundFileHeaderType/ns1:fileName',$CustomFilename,'ns1=http://xmlns.oracle.com/pcbpel/adapter/file/Capture_PO_Event_Data/;')"/>
<xsl:template match="/">
<ns2:HCNPOWFEVENT>
<xsl:for-each select="/imp1:WF_EVENT_T/PARAMETER_LIST/PARAMETER_LIST_ITEM">
<xsl:if test='NAME = "DOCUMENT_NO"'>
<ns2:PONo>
<xsl:value-of select="VALUE"/>
</ns2:PONo>
</xsl:if>
</xsl:for-each>
<xsl:for-each select="/imp1:WF_EVENT_T/PARAMETER_LIST/PARAMETER_LIST_ITEM">
<xsl:if test='NAME = "ECX_TRANSACTION_TYPE"'>
<ns2:POType>
<xsl:value-of select="VALUE"/>
</ns2:POType>
</xsl:if>
</xsl:for-each>
<xsl:for-each select="/imp1:WF_EVENT_T/PARAMETER_LIST/PARAMETER_LIST_ITEM">
<xsl:if test='NAME = "ECX_TRANSACTION_SUBTYPE"'>
<ns2:POSubType>
<xsl:value-of select="VALUE"/>
</ns2:POSubType>
</xsl:if>
</xsl:for-each>
<xsl:for-each select="/imp1:WF_EVENT_T/PARAMETER_LIST/PARAMETER_LIST_ITEM">
<xsl:if test='NAME = "ECX_PARAMETER5"'>
<ns2:OrgId>
<xsl:value-of select="VALUE"/>
</ns2:OrgId>
</xsl:if>
</xsl:for-each>
<xsl:for-each select="/imp1:WF_EVENT_T/PARAMETER_LIST/PARAMETER_LIST_ITEM">
<xsl:if test='NAME = "ECX_PARTY_ID"'>
<ns2:ECXPartyId>
<xsl:value-of select="VALUE"/>
</ns2:ECXPartyId>
</xsl:if>
</xsl:for-each>
<xsl:for-each select="/imp1:WF_EVENT_T/PARAMETER_LIST/PARAMETER_LIST_ITEM">
<xsl:if test='NAME = "ECX_PARTY_SITE_ID"'>
<ns2:ECXPartySiteId>
<xsl:value-of select="VALUE"/>
</ns2:ECXPartySiteId>
</xsl:if>
</xsl:for-each>
</ns2:HCNPOWFEVENT>
</xsl:template>
</xsl:stylesheet>
Any ideas on how this can be achieved ?

Answer 1

Ok I was able to get fileadapter filenames modified.
First you cannot do this after a dbadapter query as that functionality seems to be broken. The best way to solve it for me was to simplify the problem, I started with placing the setoutbound header data after reading a simple file and ignoring the files content altogether. I do the set inside a match of the xslt using a constant value, again for simplicity. For the test just put in 'ateststring.txt' in the setoutbound header call, no need to select data from the document at this point; we will get to that. Now get that to work.
Once you have that working take a value from the incoming document and select it into a variable named myvariable then replace the 'ateststring.txt' with $myvariable. So basically its a three step process for the final solution. Select the data of interest from the document into a variable. add a select statement to make the method call just after that. Make the method call inside the select statement and prepend the variable name with the $ symbol.
So far I have only tested this file to file and file to ftp, I suspect that jmsadapter to file will work fine too. So the trick for me was to understand that if an incoming document is the result of a query that just wont do. My requirement was to take an input JMS request, use that to drive a query, take the data from the query and write it to a filename as defined in the JMS request. No matter what I did to set the frustrating fileadapter/ftpadapter filename in the header I was unable to do so. I used constant strings etc in every part of the document ( before select, inside select, outside select etc ). It wasnt until I went file to file that I was able to get this to work at all. And then not in the xslt header etc, it MUST be in an area of the document that resulted in a select match, which after review makes sense.
To work around the query to file issue, I place the results of the data query into a temporary filename%SEQ%.tmp, along with the query results I add the real filename inside the document. I have a file listener that listens for the filename using wildcards filename*.tmp, it takes the file reads it in, pulls the permanent filename from the incoming document, and sets that filename in the header using the steps worked out above by selecting the filename into myvariable.
You cannot ( to my knowlege ) store variables in ESB so I found I had to put them inside the documents to move the data around. When I am all done with the work through the routing service I strip out the variable data fields that I needed to carry along with the data.
Please let me know how you are going with this, I hope this saves someone else a bit of frustration.
Thanks again,
John