| /** |
| * Copyright 2016-present 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.kafka; |
| |
| import org.apache.felix.scr.annotations.Activate; |
| import org.apache.felix.scr.annotations.Component; |
| import org.apache.felix.scr.annotations.Deactivate; |
| import org.apache.felix.scr.annotations.Modified; |
| import org.apache.felix.scr.annotations.Property; |
| import org.apache.felix.scr.annotations.Reference; |
| import org.apache.felix.scr.annotations.ReferenceCardinality; |
| import org.apache.kafka.clients.producer.ProducerRecord; |
| import org.onosproject.cfg.ComponentConfigService; |
| import org.onosproject.kafkaintegration.api.EventConversionService; |
| import org.onosproject.kafkaintegration.api.EventSubscriptionService; |
| import org.onosproject.net.device.DeviceEvent; |
| import org.onosproject.net.device.DeviceListener; |
| import org.onosproject.net.device.DeviceService; |
| import org.onosproject.net.link.LinkEvent; |
| import org.onosproject.net.link.LinkListener; |
| import org.onosproject.net.link.LinkService; |
| import org.osgi.service.component.ComponentContext; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.Dictionary; |
| import java.util.UUID; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.ExecutorService; |
| |
| import static com.google.common.base.Strings.isNullOrEmpty; |
| import static java.util.concurrent.Executors.newSingleThreadScheduledExecutor; |
| import static org.onlab.util.Tools.get; |
| import static org.onlab.util.Tools.groupedThreads; |
| import static org.onosproject.kafkaintegration.api.dto.OnosEvent.Type.DEVICE; |
| import static org.onosproject.kafkaintegration.api.dto.OnosEvent.Type.LINK; |
| |
| /** |
| * Encapsulates the behavior of monitoring various ONOS events. |
| * */ |
| @Component(immediate = true) |
| public class EventMonitor { |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected EventSubscriptionService eventSubscriptionService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected EventConversionService eventConversionService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected DeviceService deviceService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected LinkService linkService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected ComponentConfigService componentConfigService; |
| |
| private final DeviceListener deviceListener = new InternalDeviceListener(); |
| private final LinkListener linkListener = new InternalLinkListener(); |
| |
| protected ExecutorService eventExecutor; |
| |
| private static final String BOOTSTRAP_SERVERS = "localhost:9092"; |
| private static final int RETRIES = 1; |
| private static final int MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION = 5; |
| private static final int REQUEST_REQUIRED_ACKS = 1; |
| private static final String KEY_SERIALIZER = "org.apache.kafka.common.serialization.StringSerializer"; |
| private static final String VALUE_SERIALIZER = "org.apache.kafka.common.serialization.ByteArraySerializer"; |
| |
| @Property(name = "bootstrap.servers", value = BOOTSTRAP_SERVERS, |
| label = "Default host/post pair to establish initial connection to Kafka cluster.") |
| private String bootstrapServers = BOOTSTRAP_SERVERS; |
| |
| @Property(name = "retries", intValue = RETRIES, |
| label = "Number of times the producer can retry to send after first failure") |
| private int retries = RETRIES; |
| |
| @Property(name = "max.in.flight.requests.per.connection", intValue = MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION, |
| label = "The maximum number of unacknowledged requests the client will send before blocking") |
| private int maxInFlightRequestsPerConnection = MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION; |
| |
| @Property(name = "request.required.acks", intValue = 1, |
| label = "Producer will get an acknowledgement after the leader has replicated the data") |
| private int requestRequiredAcks = REQUEST_REQUIRED_ACKS; |
| |
| @Property(name = "key.serializer", value = KEY_SERIALIZER, |
| label = "Serializer class for key that implements the Serializer interface.") |
| private String keySerializer = KEY_SERIALIZER; |
| |
| @Property(name = "value.serializer", value = VALUE_SERIALIZER, |
| label = "Serializer class for value that implements the Serializer interface.") |
| private String valueSerializer = VALUE_SERIALIZER; |
| |
| private Producer producer; |
| |
| @Activate |
| protected void activate(ComponentContext context) { |
| componentConfigService.registerProperties(getClass()); |
| eventExecutor = newSingleThreadScheduledExecutor(groupedThreads("onos/onosEvents", "events-%d", log)); |
| deviceService.addListener(deviceListener); |
| linkService.addListener(linkListener); |
| producer = new Producer(bootstrapServers, retries, maxInFlightRequestsPerConnection, |
| requestRequiredAcks, keySerializer, valueSerializer); |
| producer.start(); |
| |
| log.info("Started"); |
| } |
| |
| @Deactivate |
| protected void deactivate() { |
| componentConfigService.unregisterProperties(getClass(), false); |
| deviceService.removeListener(deviceListener); |
| linkService.removeListener(linkListener); |
| producer.stop(); |
| eventExecutor.shutdownNow(); |
| eventExecutor = null; |
| |
| log.info("Stopped"); |
| } |
| |
| @Modified |
| private void modified(ComponentContext context) { |
| if (context == null) { |
| bootstrapServers = BOOTSTRAP_SERVERS; |
| retries = RETRIES; |
| maxInFlightRequestsPerConnection = MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION; |
| requestRequiredAcks = REQUEST_REQUIRED_ACKS; |
| keySerializer = KEY_SERIALIZER; |
| valueSerializer = VALUE_SERIALIZER; |
| return; |
| } |
| Dictionary properties = context.getProperties(); |
| |
| String newBootstrapServers = BOOTSTRAP_SERVERS; |
| int newRetries = RETRIES; |
| int newMaxInFlightRequestsPerConnection = MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION; |
| int newRequestRequiredAcks = REQUEST_REQUIRED_ACKS; |
| try { |
| String s = get(properties, "bootstrapServers"); |
| newBootstrapServers = isNullOrEmpty(s) |
| ? bootstrapServers : s.trim(); |
| |
| s = get(properties, "retries"); |
| newRetries = isNullOrEmpty(s) |
| ? retries : Integer.parseInt(s.trim()); |
| |
| s = get(properties, "maxInFlightRequestsPerConnection"); |
| newMaxInFlightRequestsPerConnection = isNullOrEmpty(s) |
| ? maxInFlightRequestsPerConnection : Integer.parseInt(s.trim()); |
| |
| s = get(properties, "requestRequiredAcks"); |
| newRequestRequiredAcks = isNullOrEmpty(s) |
| ? requestRequiredAcks : Integer.parseInt(s.trim()); |
| |
| } catch (NumberFormatException | ClassCastException e) { |
| return; |
| } |
| |
| boolean modified = newBootstrapServers != bootstrapServers || |
| newRetries != retries || |
| newMaxInFlightRequestsPerConnection != maxInFlightRequestsPerConnection || |
| newRequestRequiredAcks != requestRequiredAcks; |
| |
| if (modified) { |
| bootstrapServers = newBootstrapServers; |
| retries = newRetries; |
| maxInFlightRequestsPerConnection = newMaxInFlightRequestsPerConnection; |
| requestRequiredAcks = newRequestRequiredAcks; |
| if (producer != null) { |
| producer.stop(); |
| } |
| producer = new Producer(bootstrapServers, retries, maxInFlightRequestsPerConnection, |
| requestRequiredAcks, keySerializer, valueSerializer); |
| producer.start(); |
| log.info("Modified"); |
| } else { |
| return; |
| } |
| } |
| |
| private class InternalDeviceListener implements DeviceListener { |
| |
| @Override |
| public void event(DeviceEvent event) { |
| if (!eventSubscriptionService.getEventSubscribers(DEVICE).isEmpty()) { |
| eventExecutor.execute(() -> { |
| try { |
| String id = UUID.randomUUID().toString(); |
| producer.send(new ProducerRecord<>(DEVICE.toString(), |
| id, event.subject().toString().getBytes())).get(); |
| log.debug("Device event sent successfully."); |
| } catch (InterruptedException e) { |
| Thread.currentThread().interrupt(); |
| } catch (ExecutionException e) { |
| log.error("Exception thrown {}", e); |
| } |
| }); |
| } else { |
| log.debug("No device listeners"); |
| } |
| } |
| } |
| |
| private class InternalLinkListener implements LinkListener { |
| |
| @Override |
| public void event(LinkEvent event) { |
| if (!eventSubscriptionService.getEventSubscribers(LINK).isEmpty()) { |
| eventExecutor.execute(() -> { |
| try { |
| String id = UUID.randomUUID().toString(); |
| producer.send(new ProducerRecord<>(LINK.toString(), |
| id, event.subject().toString().getBytes())).get(); |
| log.debug("Link event sent successfully."); |
| } catch (InterruptedException e) { |
| Thread.currentThread().interrupt(); |
| } catch (ExecutionException e) { |
| log.error("Exception thrown {}", e); |
| } |
| }); |
| } else { |
| log.debug("No link listeners"); |
| } |
| } |
| } |
| } |