| /** |
| * Copyright 2016-present Open Networking Foundation |
| * |
| * 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.kafka; |
| |
| import org.osgi.service.component.annotations.Activate; |
| import org.osgi.service.component.annotations.Component; |
| import org.osgi.service.component.annotations.Deactivate; |
| import org.osgi.service.component.annotations.Reference; |
| import org.osgi.service.component.annotations.ReferenceCardinality; |
| import org.apache.kafka.clients.producer.ProducerRecord; |
| import org.onosproject.cluster.ClusterService; |
| import org.onosproject.cluster.LeadershipService; |
| import org.onosproject.cluster.NodeId; |
| import org.onosproject.kafkaintegration.api.KafkaConfigService; |
| import org.onosproject.kafkaintegration.api.KafkaPublisherService; |
| import org.onosproject.kafkaintegration.api.KafkaEventStorageService; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.onosproject.kafkaintegration.api.dto.OnosEvent; |
| |
| import java.util.Objects; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.TimeUnit; |
| |
| @Component(immediate = true) |
| public class EventPublisher { |
| |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected LeadershipService leadershipService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected ClusterService clusterService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected KafkaConfigService kafkaConfigService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected KafkaEventStorageService kafkaStore; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected KafkaPublisherService kafkaPublisher; |
| |
| protected ScheduledExecutorService exService; |
| |
| private static final String SUBSCRIBER_TOPIC = "WORK_QUEUE_SUBSCRIBER"; |
| |
| private NodeId localNodeId; |
| |
| // Thread Scheduler Parameters |
| private final long delay = 0; |
| private final long period = 1; |
| |
| private EventCollector eventCollector; |
| |
| @Activate |
| protected void activate() { |
| |
| leadershipService.runForLeadership(SUBSCRIBER_TOPIC); |
| |
| localNodeId = clusterService.getLocalNode().id(); |
| |
| startCollector(); |
| |
| log.info("Started"); |
| } |
| |
| private void startCollector() { |
| exService = Executors.newSingleThreadScheduledExecutor(); |
| eventCollector = new EventCollector(); |
| exService.scheduleAtFixedRate(eventCollector, delay, period, TimeUnit.SECONDS); |
| } |
| |
| @Deactivate |
| protected void deactivate() { |
| stopCollector(); |
| log.info("Stopped"); |
| } |
| |
| private void stopCollector() { |
| exService.shutdown(); |
| } |
| |
| private class EventCollector implements Runnable { |
| |
| @Override |
| public void run() { |
| |
| // do not allow to proceed without leadership |
| NodeId leaderNodeId = leadershipService.getLeader(SUBSCRIBER_TOPIC); |
| if (!Objects.equals(localNodeId, leaderNodeId)) { |
| log.debug("Not a Leader so cannot consume event"); |
| return; |
| } |
| |
| try { |
| OnosEvent onosEvent = kafkaStore.consumeEvent(); |
| |
| if (onosEvent != null) { |
| kafkaPublisher.send(new ProducerRecord<>(onosEvent.type().toString(), |
| onosEvent.subject())).get(); |
| |
| log.info("Event Type - {}, Subject {} sent successfully.", |
| onosEvent.type(), onosEvent.subject()); |
| } |
| } catch (InterruptedException e1) { |
| log.error("Thread interupted"); |
| Thread.currentThread().interrupt(); |
| } catch (ExecutionException e2) { |
| log.error("Cannot publish data to Kafka - {}", e2); |
| } |
| } |
| } |
| |
| } |