Motivation

...

To calculate object graph size (deep object size) in common case reflection and recursive reference fields traverse must be used, taking into account already visited objects. 

In our case we need rather fast than precise tool. We can use cached shallow size for most frequently used classes (classes natively supported by calcite type system and perhaps classes, supported by marshaller, which we can find in _KEY or _VAL fields) and shortcuts to calculate full deep object size without using reflection (but still with recursive traversal for some classes, like collections). For other classas (rare case, for example when object marshalled with OptimizedMarshaller appears in _KEY or _VAL column) recursive traversal through reflection is requred. Alternatively, we can skip calculation for such a classes and use some constant value.

...