//Obtains the engine instance already configured
DataIntegrationEngine engine = Univocity.getEngine(engineName);

//Creates a mapping builder from "sourceDataStore" to "destinationDataStore".
DataStoreMapping mapping = engine.map("sourceDataStore", "destinationDataStore");

//With a data store mapping builder, we can start creating mappings between 
//their entities (tables, files, custom entities you create yourself, etc)
//This creates an entity mapping builder
EntityMapping entityMapping = mapping.map("source_entity", "destination_entity");

//With an entity mapping builder, we can create mappings between their fields. 
//Queries, methods, external services and any object available in your 
//application can be used as well.
entityMapping.identity()
	.associate("source_key_1", "source_key_2")
	.toGeneratedId("destination_id");

//Copies values from source_entity.some_description to destination_id.some_field. 
//All values read from `some_description` and `another_description` will be
//trimmed then converted to lower case, as specified in the sequence of functions
entityMapping.value()
	.copy("some_description", "another_description")
	.to("some_field", "another_field")
	.readingWith("trim", "toLowerCase");

//Creates a function that will execute calls to `yourAccountService` for some 
//account number. The engine scope caches the result for each given account 
//and reuses it while a mapping cycle is active.  
engine.addFunction(EngineScope.CYCLE, "getAccountBalance", new FunctionCall<BigDecimal, String>() {
        @Override
        public BigDecimal execute(String accountNumber) {
            return yourAccountService.findAccount(accountNumber).getBalance();
        }
   });

    //You can use values taken from the source entity to call your function
   entityMapping.value().copy("accountNumber").to("balance").readingWith("getAccountBalance");
   
   //Use it directly:
   entityMapping.value().copy("{getAccountBalance('12345')}").to("balance");
   
   //With variables:
   engine.setVariable("account", myAccountObject);
   entityMapping.value().copy("{getAccountBalance($account)}").to("balance");
          
//Configures how data mapped from `source_entity` to 
//`destination_entity` should be persisted, if at all.
entityMapping.persistence()
	.usingMetadata()  //Generate metadata to enable features such as data change detection. 
	.deleteDisabled() //Do not remove any existing records
	.updateModified() //Update destination records if the counterpart in the source has been changed.
	.insertNewRows(); //Insert new rows identified in the source entity

//Executes a data mapping cycle
engine.executeCycle();

...