Introduction:
Recently came across multiple SCN threads looking for how to deal with dynamic value mapping in SAP CPI,so this is how you can achieve the same with small example.
Scenario:
We will use POSTMAN HTTP client to push some message and get the transformed output using value mapping api ( after value mapping performed ).
Creation of Integration Artifact:
Create an IFlow having below steps as described.
Step 1:
Create a HTTP Sender Communication Channel
Step 2:
Add mapping step following below.
Input and Output Structure:
Mapping Overview of field containing value mapping:
Create a custom function to call the ValueMappingApi Mapping Java API[ Mapping API ] which internally calls the Value Mapping project and gets the required output.
Creation of Custom Function:
Custom Function Script:
Copy paste the below code in Window opened in #4 of Custom function creation.
import com.sap.it.api.mapping.*;
import com.sap.it.api.ITApiFactory;
import com.sap.it.api.ITApi;
import com.sap.it.api.mapping.ValueMappingApi;
/*Add MappingContext parameter to read or set headers and properties
def String customFunc1(String P1,String P2,MappingContext context) {
String value1 = context.getHeader(P1);
String value2 = context.getProperty(P2);
return value1+value2;
}
Add Output parameter to assign the output value.
def void custFunc2(String[] is,String[] ps, Output output, MappingContext context) {
String value1 = context.getHeader(is[0]);
String value2 = context.getProperty(ps[0]);
output.addValue(value1);
output.addValue(value2);
}*/
def String dynamicValueMap(String sAgency, String sSchema, String tAgency, String tSchema, String key){
def service = ITApiFactory.getApi(ValueMappingApi.class, null);
if( service != null) {
String val= service.getMappedValue(sAgency, sSchema, key, tAgency, tSchema);
if ( val.equals("") || val ==null )
{
return "default"
}
else
return val
}
return null;
}Step 3:
Add intermediate step ( optional ) Write if you want to check the transformed output ( although you get it as response in POSTMAN ).
Step 4:
Save and Deploy your IFlow.
Creation of Value Mapping Artifact:
Create value mapping which can be referred dynamically in your script based on the input you have sent.
My value mapping looks like ( simple one:) )
Save and deploy it.Now we are good to go with our testing.
Testing with some successful transformation screenshots:
Further Enhancements:
- Even further enhancements can be done to this scenario instead of passing schema & agency you can send some unique no and in later stage of transformation( Custom Function ) manipulate which Value Mapping to be used.
- You can handle failure case of value mapping ( in our case I have hard coded "default" for failure case) by passing custom key or default value in input payload.
Reference:
[1] Java Mapping API Help
Hope this is helpful..!
Regards,
Sriprasad Shivaram Bhat
- SAP Managed Tags:
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