Steven E. Harris a écrit :
Clement Escoffier <[EMAIL PROTECTED]> writes:
Yes, it is but it does nothing. iPOJO will publish an
ManagedServiceFacotry service with foo.factory as service.pid. You
can create component instances via this service.
When you say "it does nothing", do you just mean that no instances
actually get created? If so, all is well, as it's just the provision
of the ManagedServiceFactory that I was after here.
Yes, it does not create any instance. Moreover, once you create an
instance with the factory, this instance will do nothing with the
following metadata :
<iPOJO>
<component className="Foo" factory="foo.factory"/>
</iPOJO>
If you want to create on POJO object, add immediate="true" in the
component tag. By default, the POJO instantiation are delayed (lazzy).
If you do not have "immediate="true" or a invalid->invalid callback,
your POJO is not instantiated until it is really needed (to serve a
service for example).
Looking at my bundle running, I see the ManagedServiceFactory is
registered.
Else, you can create instances dynamically with another service :
org.apache.felix.ipojo.Factory. This service does not have exactly
the same semantic as ManagedServiceFactory.
Can you summarize briefly why one would choose to use iPOJO's Factory
interface rather than ManagedServiceFactory?
It is the same difference than between ManagedServiceFactory and DS
ComponentFactory. However, the iPOJO Factory allows to get the
component-type description, check if a configuration is acceptable or not ..
To create instances, with the ManagedServiceFactory, you push a new
configuration. With iPOJO Factory, you will call createInstance, then
you received a reference on the instance. You have a stronger control on it.
The instance modification is not supported by iPOJO Factory. However,
for the Managed ServiceFactory, when an instance is modified, the
instance is killed and re-created with the new configuration (I am not
sure that's consitent with the DS specification).
To delete an instance with the ManagedServiceFactory, you called the
delete method. With the iPOJO Factory, you stop the instance. (stop is
similar to the DS dispose method).
[...]
Thanks for the prompt explanation.
You're welcome.
Clement
--
Clement Escoffier
Grenoble University
LSR - Bat. C
220, Rue de la Chimie
BP 53
38041 GRENOBLE CEDEX 9
04.76.51.40.24
http://clement.plop-plop.net
