+/*
+ * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
package org.opendaylight.controller.sal.core.api;
import java.util.Collection;
import java.util.Collections;
-
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
+import org.osgi.util.tracker.ServiceTracker;
+import org.osgi.util.tracker.ServiceTrackerCustomizer;
-public abstract class AbstractConsumer implements Consumer, BundleActivator {
-
- Broker broker;
- ServiceReference<Broker> brokerRef;
- @Override
- public final void start(BundleContext context) throws Exception {
- brokerRef = context.getServiceReference(Broker.class);
- broker = context.getService(brokerRef);
+public abstract class AbstractConsumer implements Consumer, BundleActivator,ServiceTrackerCustomizer<Broker, Broker> {
- this.startImpl(context);
+ private BundleContext context;
+ private ServiceTracker<Broker, Broker> tracker;
+ private Broker broker;
- broker.registerConsumer(this,context);
+ @Override
+ public final void start(final BundleContext bundleContext) throws Exception {
+ this.context = bundleContext;
+ this.startImpl(bundleContext);
+ tracker = new ServiceTracker<>(bundleContext, Broker.class, this);
+ tracker.open();
}
- public abstract void startImpl(BundleContext context);
-
@Override
- public final void stop(BundleContext context) throws Exception {
+ public final void stop(final BundleContext bundleContext) throws Exception {
+ stopImpl(bundleContext);
broker = null;
- if(brokerRef != null) {
- context.ungetService(brokerRef);
+
+ if (tracker != null) {
+ tracker.close();
}
}
-
+ protected void startImpl(final BundleContext bundleContext) {
+ // NOOP
+ }
+
+ protected void stopImpl(final BundleContext bundleContext) {
+ // NOOP
+ }
+
@Override
public Collection<ConsumerFunctionality> getConsumerFunctionality() {
return Collections.emptySet();
}
+
+ @Override
+ public Broker addingService(final ServiceReference<Broker> reference) {
+ if (broker == null && context != null) {
+ broker = context.getService(reference);
+ broker.registerConsumer(this, context);
+ return broker;
+ }
+
+ return null;
+ }
+
+ @Override
+ public void modifiedService(final ServiceReference<Broker> reference, final Broker service) {
+ // NOOP
+ }
+
+ @Override
+ public void removedService(final ServiceReference<Broker> reference, final Broker service) {
+ stopImpl(context);
+ }
}