<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>org.apache.felix.scr.annotations</artifactId>
<version>1.12.0</version>
<scope>provided</scope>
</dependency>
package com.example.helloworld;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
@Component
public class HelloWorld {
@Reference
private GreetingService greetingService;
public void sayHello() {
System.out.println(greetingService.getGreeting() + " World!");
}
}
package com.example.helloworld;
public interface GreetingService {
String getGreeting();
}
package com.example.helloworld;
import org.osgi.service.component.annotations.Component;
@Component(service = GreetingService.class)
public class GreetingServiceImpl implements GreetingService {
@Override
public String getGreeting() {
return "Hello";
}
}
package com.example.helloworld;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
public class Main implements BundleActivator {
private ServiceReference<HelloWorld> serviceReference;
@Override
public void start(BundleContext context) throws Exception {
serviceReference = context.getServiceReference(HelloWorld.class);
HelloWorld helloWorld = context.getService(serviceReference);
helloWorld.sayHello();
}
@Override
public void stop(BundleContext context) throws Exception {
context.ungetService(serviceReference);
}
}
