BookStore with Gigamap question

[hrstoyanov]

Looking at the Bookstore demo with Gigamap I see this pattern in almost all methods:

public class Books extends ReadWriteLocked
...
public List<Book> allByLanguage(final Language language)
	{
		return this.read(() ->
			this.map.query(Book.languageIndex.is(language)).toList()
		);
	}
}

Is the extra locking at Books object level necessary? As per the Gigmap docs, there is already locking mechanism in Gigamap?

Likewise updates also use lock in the gigamap object, so no external locking needed?

// update uses Gigamap.Default.apply, which is synchronized for the entire gigamap object.
gigaMap.update(person, p -> p.setAddress(new Address(new Faker())));

[hrstoyanov]

Answering my question partly: As far as updates - there are cases where the entity is updated but the updated fields are not part of the gigamap index, and therefore an extra lock in needed?