Hi everyone!
I asked a question on stackoverflow regarding the use of Declarative
Services in Karaf to manage multiple instances of a service, provided by
different implementations of such a service.
The question is explained in details here:
http://stackoverflow.com/questions/34706041/how-to-manage-several-service-instances-in-declarative-services
I received and answer telling me that using the @reference annotation on
the list storing the services would solve my problem. For this, I would
need to use DS 1.3.
I thus asked on Karaf users mailing list what was the version of Felix
SCR provided with Karaf 4.0.3
(http://mail-archives.apache.org/mod_mbox/karaf-user/201601.mbox/%3C8dbfa59508d5769609e2c78c0210c7aa%40petinou.fr%3E)
and was told it was Felix SCR 2.0.2, which supports DS 1.3. So far so
good.
I was also kindly advised to ask this kind of questions here. So here I
am :-)
Following the answer on stackoverflow, I tried to add the @reference
annotation to my service list like this:
@Reference(service = FileReader.class)
private List<FileReader> availableServices = new ArrayList<>();
But it does not compile: FileReaderFactory.java:[37,5] annotation type
not applicable to this kind of declaration
My project has a dependency on:
<dependency>
<groupId>org.osgi</groupId>
<artifactId>org.osgi.compendium</artifactId>
<version>5.0.0</version>
<scope>provided</scope>
</dependency>
which seems to be the latest version available.
I thus tried the "older way" by using explicit bind/unbind methods like
this:
@Reference(service = FileReader.class, unbind = "removeService")
public void addService(final FileReader serviceToAdd) {
System.out.println("FileReaderFactory.addService");
availableServices.add(serviceToAdd);
System.out.println(availableServices);
}
public void removeService(final FileReader serviceToRemove) {
System.out.println("FileReaderFactory.removeService");
availableServices.remove(serviceToRemove);
System.out.println(availableServices);
}
If I have two implementations available, say TxtFileReader and
XmlFileReader, only the first one is added to the list. The status of
the second service (using scr:detail command) is "null".
What am I missing?
Kind regards,
Ben
