-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Gavin King Sent: Wednesday, April 28, 2004 2:25 AM To: Henri Tremblay Cc: 'hibernate-devel' Subject: Re: [Hibernate] Startup time
Gavin King wrote: >>2- Lazy load the conf. I mean, don't load every file at the beginning, >>only when the session using the configuration needs it. So for instance >>load a persistent class only when there's a query on it. Again, a >>having the two possibilities will be nice (everything at startup or as >>needed). However, as Gavin said, it might not be possible... One cannot >>guess where is the class of query he is looking for. It might become >>possible it we change the approach. For instance having a >>addLazyClass(Class persistentClass) method so you know that it you need >>the mapping the the class, you know it's in the hbm.xml having the same name. >> >> >This would be really hard. Remember that each class needs to know about all associated classes to figure out fk types, etc. Maybe introducing some kind of interface for SessionFactoryImpl to get mapping information would help. Currently user creates Configuration object which is passed to SessionFactoryImpl which creates Maps for all kinds of hibernate objects. It is now not possible to dynamic load this stuff, becouse Hibernate simply checks in this Map for given object and there is no chance to load this if necessery. If SessionFactory would get persisters etc. through some interface, then implemetntaion could do lazy loading if necessery. The problem could be performance impact for queries becouse now this Maps are final (althougth making this "configuration" interface field final should have the same effect) With such configuration "pulling" interface would also be easy to get lazy persistent mappigs from different sources (e.g. database or anywhere else). Having option to store mapping in database would also pay off in performance as it should be faster than parsing lot of XML files. Lazy configuration is the best choice to make it fast to start application with hundreds of persistent class especially for testing and client applications where during application life time user can use only small percent of them ---------------- Marek Mosiewicz http://www.jotel.com.pl ------------------------------------------------------- This SF.Net email is sponsored by: Oracle 10g Get certified on the hottest thing ever to hit the market... Oracle 10g. Take an Oracle 10g class now, and we'll give you the exam FREE. http://ads.osdn.com/?ad_id=3149&alloc_id=8166&op=click _______________________________________________ hibernate-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/hibernate-devel
