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Posted: **Sat Jun 23, 2012 4:45 am**

Does calling a method on an object bring it into the cache or only accessing one of its properties?

Specifically I'm looping through a lot of objects and collecting ones that are of a certain type and I don't want to bring any more of them into the cache than I have to. So my question is whether calling Object::isKindOf on each object is going to bring them all into the cache.

The only way I can see of avoiding calling isKindOf on each object is to use getClassForObject, but that doesn't do exactly the same thing as isKindOf...

Posted: **Sat Jun 23, 2012 8:05 am**

I've answered my own question using Process::getBufferStatistics:

Code: Select all

vars
	d : Document;
	jdo : JadeDynamicObject;
	
begin
	create jdo transient;
	
	d := Document.firstInstance;
	
	if process.getBufferStatistics(d, jdo) then
		write "object is in cache";
	else
		write "object is not in cache";
	endif;
	
	write d.isKindOf(Document);
	
	if process.getBufferStatistics(d, jdo) then
		write "object is in cache";
	else
		write "object is not in cache";
	endif;

	write d.docName;
	
	if process.getBufferStatistics(d, jdo) then
		write "object is in cache";
	else
		write "object is not in cache";
	endif;
	
epilog
	delete jdo;
	
end;

This seems to say that calling isKindOf does not load the object into the cache but reading a property does.

Posted: **Sat Jun 23, 2012 3:26 pm**

I think isKindOf() probably just checks the class number from the OID against theClass metadata.

Posted: **Fri Jul 06, 2012 9:13 am**

murray is correct, isKindOf just checks the class number rather than getting the object. It used to get the object, but was optimized by Jade around version 6 / 6.1.

As it's only reliant on the OID, isKindOf works without exception for both null and invalid object references, which means you can omit a null check when you need to check the type of an object

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