Tags: .NET, Frameworks (XAF & XPO), eXpressApp FrameworkID
:Q403538
Created O n :5/23/2012 7:47:13 PM
Mod if ied O n :5/24/2012 6:09:03 PM
B u ild :v2010 vo l 2.8 / 25-Apr-2011
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Provide some method to really update XPObjectTypes
0 Marco 4 years ago
H i,
In our application, we had the following situation:
Classname: "Event", Tablename "InfEvent"
This class also had a baseclass (EventBase) and as such, it's
XPObjectType.Oid was used in the EventBase.ObjectType column.
We needed to replace the Event class by a new Event class. The
old 'Events' needed to be converted to new 'Events' and as such,
the old one was renamedto InfEvent (to line it up with the name of
the database table).
As we knew, we had to update the XPObjectType manually but
during conversion of the 'InfEvent' objects to the new 'Event'
class, it appeared that XPOtried to load InfEvent objects from the
Event table (which was still empty).
After long investigation, it appears that XPO uses 2 caches for
the XPObjectTypes. One of them is in the XPObjectTypesManager
(_allTypes) the other one inBaseDataLayer.StaticData.
Changing the XPObjectType record in the database does not reload
these caches, so we looked at
a way to do that manually.
The XPObjectTypesManager cache can be reset by calling a
DropIdentityMap.
The Static Data dictionary in BaseDataLayer however, can only be
cleared by calling ClearStaticData. This method is protected and
the only calling methodis ClearDatabase, something we definitely do
not want.
So, in fact there is no normal way to clear this cache without
clearing the database.
IMHO, when XPO notices a change in an XPObjectType object, it
should have an ability to refresh it's
cache of XPObjects as well, or refresh it automatically.
Thanks,Marco
P.S. As a workaround, we now call ClearStaticData by using
reflection, but of course this is not a good solution.
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1 Solution
0 Michael (DevExpress Support) 4 years ago
Hi Marco,
Thank you for the question. Your scenario is quite unusual and I
am afraid we won't publish this internal method. Instead of clering
this dictionary or clearingthe dataabse, I recommend that you
create a new data layer after your type manipulations.
>>>IMHO, when XPO notices a change in an XPObjectType
object, it should have an ability to refresh it'scache of XPObjects
as well, or refresh it automatically.
The XPObjectType class is defined as session-less and does not
support change notifications. We have not considered such scenarios
when designing theXPO Library.
Hi M ich ael,
Allth ou gh i d id n o t con sider th is so lu tion , it is n o
t a so lu tion in ou r scen ario . W e u se XPO w ith in XAF an d
at th e po in t w e u pdate th eXPO b jectType tab le, th e cu rren
t DataLayer may be u sed a lready in severa l o th er Session s / O
b jectSpaces.So recreatin g th e DataLayer is n o t a so lu tion
.
An yw ay, th an ks fo r you r in terest.
Marco 4 years ago
Th an k you fo r men tion in g XAF . I su ggest th at you refer
to th e How to : U pdate th e Database Stru ctu re after th e
Persisten t Class o r PropertyW as Ren amed o r Removed article w h
ere similar tasks w ere d iscu ssed .
Specif ica lly, you can u se th e Modu leU pdater.U pdateXPO b
jectType meth od to u pdate th is tab le. U n fo rtu n ately, it on
ly u pdates th e database,an d you n eed to man u ally reload ch an
ged XPO b jectType in stan ces. You can do th is as fo llow s:
Michael (DevExpress Support) 4 years ago
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public override void UpdateDatabaseAfterUpdateSchema() {
base.UpdateDatabaseAfterUpdateSchema(); ... _session =
((ObjectSpace)ObjectSpace).Session;
_session.CreateObjectTypeRecords(GetAssemblies()); var types =
_session.TypesManager.AllTypes; foreach (var xpObjectType in types)
{ if (!xpObjectType.Value.IsValidType) {
_session.Reload(xpObjectType.Value); } } ... }
W e w ill mod ify th e U pdateXPO b jectType meth od to au
tomatica lly reload XPO b jectType in stan ces in th e fu tu
re.Please let me kn ow if th is h elps.
[C#]
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