package ${package}.agent.internal;

import java.util.Map;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;

import com.redhat.thermostat.backend.Backend;
import com.redhat.thermostat.backend.BackendService;
import com.redhat.thermostat.common.ApplicationService;
import com.redhat.thermostat.common.MultipleServiceTracker;
import com.redhat.thermostat.common.MultipleServiceTracker.Action;
import com.redhat.thermostat.common.Version;
import com.redhat.thermostat.storage.core.WriterID;
import ${package}.storage.ExampleDAO;

public class Activator implements BundleActivator {

    private MultipleServiceTracker tracker;
    private ServiceRegistration reg;
    private Backend backend;
    
    @Override
    public void start(final BundleContext context) throws Exception {
        Class<?>[] deps = new Class<?>[] {
                BackendService.class, 
                ExampleDAO.class, 
                ApplicationService.class,
                WriterID.class
        };
        tracker = new MultipleServiceTracker(context, deps, new Action() {
            @Override
            public void dependenciesAvailable(Map<String, Object> services) {
                ApplicationService appService = (ApplicationService) services.get(ApplicationService.class.getName());
                ExampleDAO dao = (ExampleDAO) services.get(ExampleDAO.class.getName());
                WriterID writer = (WriterID) services.get(WriterID.class.getName());
                Version version = new Version(context.getBundle());
                backend = new ExampleBackend(appService, version, dao, writer);
                reg = context.registerService(Backend.class.getName(), backend, null);
            }

            @Override
            public void dependenciesUnavailable() {
                if (backend.isActive()) {
                    backend.deactivate();
                }
                reg.unregister();
            }
        });
        tracker.open();
    }

    @Override
    public void stop(BundleContext context) throws Exception {
        tracker.close();
    }

}