>From your example, it seems that 2 bundles have a copy of the same
classfile. However each bundle's classloader will load its copy of the
classfile resulting in 2 distinct classes in the VM. They both have the
same name but they are different Class objects because the tuple (class
name, class loader) is different.
So when each bundle registers an object of its class as a service, you end
up with 2 service registrations. Each service will be registered under the
same class name but the service objects are not class compatible (see
paragraph above).
Now let assume each bundle exported the package containing MyClass (the
class of the service). Then if a 3rd bundle imported that package, it
would be wired to only one of the orginal 2 bundles. So when the 3rd
bundle does a service lookup (BundleContext.getServiceReference), it will
find the service registered by the bundle to which its import is wired. If
the 3rd bundle calls BundleContext.getAllServiceReferences it will see
both services, since that method does include package wiring in its
constraints.
BJ Hargrave
Senior Technical Staff Member, IBM
OSGi Fellow and CTO of the OSGi Alliance
[EMAIL PROTECTED]
Office: +1 407 849 9117 Mobile: +1 386 848 3788
"joe antony lawrence david" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
08/08/2006 03:46 AM
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Subject
[osgi-dev] Service Registration
Hi everybody!
Greetings!
I have a doubt with service registration in OSGi R4. Can two diff
bundles register two similar services, meaning with the same classname and
properties, but with a different service impl object.
For e.g.,
Class MyClass implements BundleActivator
{
pulic void start()
{
// construct a map with a property holding this classname.
sReg = bundlecontext.registerService(this.getClass ().getName(),
this, map);
}
public void stop()
{
sReg.unregister();
}
}
Now, can I have the same class as part of two of my bundles, install
and start them sucessfully. Will two services be registered in the
framework under the same classname?
Please note that the package in which this class resides is the same in
both the bundles.
--
Cheers
Joe
----------------
Visit my blog at http://djlolly.blogspot.com
* Believing in yourself is an endless destination;
But, believing your have failed is the end of the journey.
* A pound a fret cant pay an ounce a debt.
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