Eviction of objects

Question

Hello.
I have an object model where one A object contains a collection of B objects
and an association to a "current" B object, which is also in the collection.
The B class references other persistent objects and collections.
class A {
Collection b;
B currentB;
class B {
Collection c;
D d;
E e;
Now, to conserve memory, I don't want to have other B's than the current one
in memory. So when I set currentB to a new value, I want to free the old one
for garbage collection.
Do I need to handle this myself using pm.evict(), or will Kodo do it for me
automatically?
Regards,
Dag H__idahl
[email protected]

Answer 1

This is happening inside a transaction, but I'm not concerned about the
memory usage within transactions as such.
If I understand correctly, then the objects in the Collections (implemented
as Vectors in my code, by the way), are not hard referenced, so they will be
garbage collected as needed. Then there's nothing to worry about, I guess.
--Dag
"Patrick Linskey" <[email protected]> wrote in message
news:ardi0m$p44$[email protected]..
Calling pm.evict() will actually not help -- it will only free the state
of the object.
Is this happening in a transaction, or outside a transaction?
By default, Kodo does not maintain hard references to objects in the PM
cache. So the object will be eligable for garbage collection. This is
configurable with the CacheReferenceSize property.
If the code is happening in a transaction, then we by default do hold
onto a hard ref until the transaction commits. This is also configurable.
-Patrick
Dag Hoidahl wrote:
Hello.
I have an object model where one A object contains a collection of B
objects
and an association to a "current" B object, which is also in the
collection.
The B class references other persistent objects and collections.
class A {
Collection b;
B currentB;
class B {
Collection c;
D d;
E e;
Now, to conserve memory, I don't want to have other B's than the
current one
in memory. So when I set currentB to a new value, I want to free the
old one for garbage collection.
Do I need to handle this myself using pm.evict(), or will Kodo do it
for me automatically?
Regards,
Dag H__idahl
[email protected]
Patrick Linskey [email protected]
SolarMetric Inc. http://www.solarmetric.com