public interface GreetingService {
void sayHello();
}
public class GreetingServiceImpl implements GreetingService {
public void sayHello() {
System.out.println("Hello, OSGi!");
}
}
public class Activator implements BundleActivator {
public void start(BundleContext context) {
GreetingService greetingService = new GreetingServiceImpl();
context.registerService(GreetingService.class.getName(), greetingService, null);
}
public void stop(BundleContext context) {
}
}
public class Consumer {
private ServiceTracker<GreetingService, GreetingService> serviceTracker;
public Consumer(BundleContext context) {
serviceTracker = new ServiceTracker<>(context, GreetingService.class, null);
serviceTracker.open();
}
public void useService() {
GreetingService greetingService = serviceTracker.getService();
if (greetingService != null) {
greetingService.sayHello();
} else {
System.out.println("GreetingService not found!");
}
}
public void stop() {
serviceTracker.close();
}
}
public class Activator implements BundleActivator {
private Consumer consumer;
public void start(BundleContext context) {
consumer = new Consumer(context);
consumer.useService();
}
public void stop(BundleContext context) {
consumer.stop();
}
}
