Hi,
On 12.10.2009, at 14:36, Vlatko Davidovski wrote:
Thanks Clement!
A small question.
I still cannot find how to get the managedservice parameter from the
architecture.getInstanceDescription()
Currently I have:
@Component(architecture=true, immediate=true, propagation = true,
managedservice
=
"ch
.ethz.inf.vs.aparat.registry.osgi.services.DeviceRegistryServiceImpl")
@Provides
public class DeviceRegistryServiceImpl implements
DeviceRegistryService {
.......
@Requires
private Architecture architecture;
@Validate
public void start() {
......
// I need the managedservice value here
}
Can you explain me a little bit what's your architecture and goal ?
ManagedService is a service. If enabled, iPOJO registers this service
for you with the given PID, the instance.name and factory.name
properties.
So if you know the name of your instance or of your factory (be care
if you create several component instance), you just need a service
dependencies on the service.
However, you should never directly access to the ManagedService which
is a Configuration Admin service.
If you need to get a configuration:
- either you push it in the instance declaration:
<instance component="...">
<property name="p" value="v"/>
</instance>
- or you create a ManagedServiceFactory configuration (using your
component type name as ManagedServiceFactory PID.
If you just need to reconfigure yourself, then, you just use the
(direct) reconfigure method of the Factory service.
Regards,
Clement
On Oct 12, 2009, at 7:58 AM, Clement Escoffier wrote:
Hi,
On 12.10.2009, at 02:01, Vlatko Davidovski wrote:
Hi!
As I am new to iPojo, I have a couple of questions:
1. How to get the value of the annotated field managedservice
programmatically?
The Architecture service can give you such information. If not
disabled, every instance exposed an Architecture service allowing
you to get the InstanceDescription. Thanks to that object you can
check the current state of properties, provided services,
dependencies...
2. Does immediate attribute of service A mean that required
services (B & C) are monitored and as soon as they are available,
an instance of the service A is created?
Immediate means that, as soon as valid (i.e.e service dependencies
resolved), a POJO instance will be created. It will not create a
component instance, but it will create a component implementation
class object.
3. What is the difference between @Property and @ServiceProperty?
@ServiceProperty are properties published with the provided
services (if the instance publishes services).
@Property are internal properties which are not published with the
provided services.
4. What is the usage of the attributes architecture,
factory_method, public_factory of @Component?
- architecture allows you to disable the introspection service. The
introspection is enabled by default.
- factory_method allows you to use a static method of the class to
create the POJO object. In that case, iPOJO call this method
instead of the regular constructor when the creation of one object
is required.
- public_factory allows you to set if the component type factory is
public or not. Public factories (the default) are exposed as
services (Factory, and ManagedServiceFactory) and allows the
creation of component instances from others bundles (either
declared inside a metadata.xml, or with the API).
Regards,
Clement
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