Now that is a very profound way of putting it. Well, this deals with the issues I had with how cfinvoke and other tags were described as working. Now I just have to say it right. Fun. :)
So the question now is if GC can be called programatically after all references to a large 'object' is removed during a single request. That'll have to be for another time when I don't have a chapter to finish. :) > The query itself, as an object on the heap, is never actually in the > function's local scope. Objects on the heap don't really have a scope. > References do, and the reference to that query that's declared in the > function's will be marked for deletion when the function finishes. The > query object itself will be marked for deletion when there are no more > references pointing to it. > >> > References exist on the stack; the objects being referenced >> > exist in the heap. >> >> Can you expand a bit on what you're saying here? > > Sure. If you create a query: > > <cfquery name="foo" ...> > ... > </cfquery> > > what's actually happening there is that you've created two things - > the query itself, which is just an object with some stuff in it, and a > reference to that object, "foo". > > So, then you do something like this: > > <cfset bar = foo> > > Now, you still have one query object, but two references to that > object: foo and bar. > > Next, you do something like this: > > <cfset structDelete(variables, "foo")> > > Now, you still have the original query object, but only one reference > to it: bar. Since all this is happening in the span of a single page > request, it won't likely make any difference in memory consumption, > but you could just as easily create references in the Session, > Application or Server scopes and things would work the same way. > > This concept of references on the stack vs objects in the heap is > common in many modern languages. Here's a description from the "Java > for ColdFusion Developers" book that came out a few years ago: > > http://www.informit.com/articles/article.aspx?p=31755&seqNum=8 > > Dave Watts, CTO, Fig Leaf Software > http://www.figleaf.com/ > http://training.figleaf.com/ > > Fig Leaf Software is a Veteran-Owned Small Business (VOSB) on > GSA Schedule, and provides the highest caliber vendor-authorized > instruction at our training centers, online, or onsite. > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Want to reach the ColdFusion community with something they want? Let them know on the House of Fusion mailing lists Archive: http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:331526 Subscription: http://www.houseoffusion.com/groups/cf-talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/groups/cf-talk/unsubscribe.cfm
