And the scope may be a larger scope than the one you define in your
program, i.e., the variables in an inner block quietly be allocated/
released in an enclosing block. So you're always safe assuming the
variable is good within the inner block but you can't assume it will
be available for collection upon exit.
You can also assume that variables recently allocated and released
will be collected first, i.e., there is locality in the collector.
(Variables in cyclic dependencies would be excepted.) This is useful
because it means that memory collected when you don't expect it to
often shows up reallocated shortly thereafter (much tougher to
bracket the problem if it were delayed indefinitely).
Overriding finalize() should tell what's really going on with aFoo
(might leave you still wondering why).
Tom
On Dec 8, 2009, at 9:53 AM, Antonio Petri wrote:
The object referenced by aFoo should only be garbage collected
after the variable goes out of scope. If the
editing context holds a strong reference to it, it shouldn't be
garbage collected.
2009/12/8 Ricardo J. Parada <[email protected]>
Hi All,
If I have a local variable that is assigned a value and never read
after that, is it possible that it may get garbage collected before
the block where it was defined. For example:
public void someMethod() {
Foo aFoo = new Foo(editingContext());
editingContext().saveChanges();
}
Will aFoo live until the end of someMethod()? Or could it get
garbage collected?
I'm asking because in the real app, Foo is a delegate of the
editing context when it gets created and it finishes its job when
the editing context saveChanges() is called. But in a non-GUI app,
we believe aFoo is getting garbage collected prematurely. Those
are someone else's findings but I though I should ask to see if
that is right.
The documentation for NSNotificationCenter says the following:
Note: If the default NSNotificationCenter is the last object in
your application with a reference to either an object registered to
receive notifications or an object being observed, that object will
be garbage collected.
P.S. Sorry if this is more a java question than a WebObjects
question. :-)
Thanks,
Ricardo
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