| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.sling.distribution.journal.kafka; |
| |
| import java.util.Arrays; |
| |
| import org.apache.sling.distribution.journal.messages.Types; |
| import org.apache.sling.distribution.journal.ExceptionEventSender; |
| import org.apache.sling.distribution.journal.MessageSender; |
| import org.apache.sling.distribution.journal.MessagingException; |
| import com.google.protobuf.GeneratedMessage; |
| import org.apache.kafka.clients.producer.KafkaProducer; |
| import org.apache.kafka.clients.producer.ProducerRecord; |
| import org.apache.kafka.clients.producer.RecordMetadata; |
| import org.apache.kafka.common.header.Header; |
| import org.apache.kafka.common.header.internals.RecordHeader; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import static java.lang.String.format; |
| import static java.nio.charset.StandardCharsets.UTF_8; |
| import static java.util.Objects.requireNonNull; |
| import static org.apache.sling.distribution.journal.kafka.KafkaClientProvider.PARTITION; |
| |
| public class KafkaMessageSender<T extends GeneratedMessage> implements MessageSender<T> { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(KafkaMessageSender.class); |
| |
| private final KafkaProducer<String, byte[]> producer; |
| |
| private final ExceptionEventSender eventSender; |
| |
| public KafkaMessageSender(KafkaProducer<String, byte[]> producer, ExceptionEventSender eventSender) { |
| this.eventSender = requireNonNull(eventSender); |
| this.producer = requireNonNull(producer); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void send(String topic, T payload) { |
| Integer type = Types.getType(payload.getClass()); |
| if (type == null) { |
| throw new IllegalArgumentException("No mapping for type " + payload.getClass().getName()); |
| } |
| int version = Types.getVersion(payload.getClass()); |
| ProducerRecord<String, byte[]> record = new ProducerRecord<>(topic, PARTITION, null, null, payload.toByteArray(), toHeaders(type, version)); |
| try { |
| RecordMetadata metadata = producer.send(record).get(); |
| LOG.info(format("Sent to %s", metadata)); |
| } catch (InterruptedException e) { |
| Thread.currentThread().interrupt(); |
| handleException(topic, e); |
| } catch (Exception e) { |
| handleException(topic, e); |
| } |
| } |
| |
| private void handleException(String topic, Exception e) { |
| eventSender.send(e); |
| throw new MessagingException(format("Failed to send message on topic %s", topic), e); |
| } |
| |
| private Iterable<Header> toHeaders(int type, int version) { |
| return Arrays.asList(toHeader("type", type), |
| toHeader("version",version)); |
| } |
| |
| private Header toHeader(String key, int value) { |
| return new RecordHeader(key, Integer.toString(value).getBytes(UTF_8)); |
| } |
| } |