db4o Developer Community

Hello! I'm doing some web services that use an embedded form of BD in db4o. When I make the request to a service any of the place, I create a static object ObjectServer for all services can use to access it, that is, the object instance in the form of BD Singleton. All services are functioning correctly if I go either locally or ...

Hi everyone, after a long time working in my university degree project, I finished it =) , and I want to start contributing again in OM development, so, thinking based in new architecture of db4o (type handlers), I have a quick question for db4o core team, what is the impact of this new architecture in the case of the OM that works with the ...

viabsb:Is it possible to develop a way for db4o write xml files and act with a xml native database like sedna or eXist or another one? The ideia is to have the registers in xml files. It would be possible to turn db4o into a pure XML database by writing a reflector layer that operates against XML. This would be a very nice community ...

In this session Rodrigo and Carl write a custom reflector with direct field access to be able to test the impact of reflection calls on the performance of db4o empirically. (Watch on-line without downloading here)

when working in a client server configuration is it requiered to have the customized reflector in the server class path ?   thanks   Yoram

tneward:jre/lib/ext isn't *just* for core JDK classes--far from it. Any extension library (and db4o marks a good candidate here) can be put there, such as scripting languages and the like.A optional package is an implementation of an open, standard API (examples of optional packages from Sun are JavaServlet, Java3D, JavaManagement). Most ...

final Configuration conf = Db4o.newConfiguration(); conf.reflectWith(new DummyReflector(Db4o.class.getClassLoader())); _db = Db4o.openFile(conf,fl.getAbsolutePath());DummyReflector is a copy of JdkReflector (I copied the whole package from db4o sources).For some reasons I cannot understand, as soon as I do ''config.reflectWith(...)'', it kills ...

Carl Rosenberger:If we try to be smarter about ClassLoaders, by finding the right one for each class, we would also make things easier for app server use. Can we solve this in a generic way? In principle we should have the required level of encapsulation in place already with the reflector layer. Perhaps it could already be sufficient to ...

Carl Rosenberger: Yes, this should work very nicely. Thanks! Good to know this is doable before getting knee deep! :) Carl Rosenberger: (1) We are not 100% happy with the way we delegate from the GenericReflector to the more specific platform reflector (JdkReflector / NetReflector / ''JamesPropertyReflector'' ). Ideally it should ...

Yes, this should work very nicely.   Three small caveats: (1) We are not 100% happy with the way we delegate from the GenericReflector to the more specific platform reflector (JdkReflector / NetReflector / ''JamesPropertyReflector'' ). Ideally it should be possible to have a longer chain of dependancies. (2) We still have some ...