public FieldType getFieldType(Field f, Class<?> clazz) {
    return manager.defaultGetFieldType(f, clazz);
  }
Controls what pdx field type will be used when auto serializing. Override this method to
customize what pdx field type will be used for a given domain class field.
<p>
The default implementation uses {@link FieldType#get(Class)} by passing it
{@link Field#getType()}.
<p>
This method is only called the first time it sees a new class. The result will be remembered
and used the next time the same class is seen.

@param f the field whose pdx field type needs to be determined
@param clazz the original class being serialized that owns this field. Note that this field may
       have been inherited from a super class by this class. If you want to find the class that
       declared this field use {@link Field#getDeclaringClass()}.
@return the pdx field type of the given domain class field.
@since GemFire 6.6.2
geode-core/src/main/java/org/apache/geode/pdx/ReflectionBasedAutoSerializer.java