Made changes as per comments.
kafkaProducer is now non-static.
TODO: KafkaPublisherManager Service and not Singleton.
Kafka event publishing.
Change-Id: I5ec20a6e4950c38e822468d343521ab77475b7d3
diff --git a/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/listener/DeviceEventsListener.java b/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/listener/DeviceEventsListener.java
new file mode 100644
index 0000000..e2f23c0
--- /dev/null
+++ b/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/listener/DeviceEventsListener.java
@@ -0,0 +1,96 @@
+/**
+ * Copyright 2016 Open Networking Laboratory
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+
+ * http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.kafkaintegration.listener;
+
+import com.google.protobuf.GeneratedMessage;
+import org.onosproject.event.ListenerService;
+import org.onosproject.kafkaintegration.api.dto.OnosEvent.Type;
+import org.onosproject.kafkaintegration.converter.ConversionFactory;
+import org.onosproject.kafkaintegration.converter.EventConverter;
+import org.onosproject.kafkaintegration.impl.KafkaPublisherManager;
+import org.onosproject.net.device.DeviceEvent;
+import org.onosproject.net.device.DeviceListener;
+import org.onosproject.net.device.DeviceService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static org.onosproject.kafkaintegration.api.dto.OnosEvent.Type.DEVICE;
+
+/**
+ * Listens for ONOS Device events.
+ *
+ */
+public final class DeviceEventsListener implements OnosEventListener {
+
+ private final Logger log = LoggerFactory.getLogger(getClass());
+
+ private boolean listenerRunning = false;
+
+ private InnerListener listener = null;
+ // Exists to defeat instantiation
+ private DeviceEventsListener() {
+ }
+
+ private static class SingletonHolder {
+ private static final DeviceEventsListener INSTANCE =
+ new DeviceEventsListener();
+ }
+
+ /**
+ * Returns a static reference to the Listener Factory.
+ *
+ * @return singleton object
+ */
+ public static DeviceEventsListener getInstance() {
+ return SingletonHolder.INSTANCE;
+ }
+
+ @Override
+ public void startListener(Type e, ListenerService<?, ?> service) {
+ if (!listenerRunning) {
+ listener = new InnerListener();
+ DeviceService deviceService = (DeviceService) service;
+ deviceService.addListener(listener);
+ listenerRunning = true;
+ }
+ }
+
+ private class InnerListener implements DeviceListener {
+
+ @Override
+ public void event(DeviceEvent arg0) {
+
+ // Convert the event to protobuf format
+ ConversionFactory conversionFactory =
+ ConversionFactory.getInstance();
+ EventConverter converter = conversionFactory.getConverter(DEVICE);
+ GeneratedMessage message = converter.convertToProtoMessage(arg0);
+
+ // Call Dispatcher and publish event
+ KafkaPublisherManager.getInstance().publish(DEVICE, message);
+ }
+ }
+
+ @Override
+ public void stopListener(Type e, ListenerService<?, ?> service) {
+ if (listenerRunning) {
+ DeviceService deviceService = (DeviceService) service;
+ deviceService.removeListener(listener);
+ listener = null;
+ listenerRunning = false;
+ }
+ }
+
+}
\ No newline at end of file