code: public static int getPartitionForParameter(VoltType partitionType, Object invocationParameter) {
          return instance.get().getSecond().getHashedPartitionForParameter(partitionType, invocationParameter);
      }
docs: Given the type of the targeting partition parameter and an object,
  coerce the object to the correct type and hash it.
  NOTE NOTE NOTE NOTE! THIS SHOULD BE THE ONLY WAY THAT
  YOU FIGURE OUT THE PARTITIONING FOR A PARAMETER! ON SERVER
  
  @return The partition best set up to execute the procedure.
  @throws VoltTypeException