| /** |
| * 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 kafka.examples; |
| |
| import org.apache.kafka.clients.producer.Callback; |
| import org.apache.kafka.clients.producer.KafkaProducer; |
| import org.apache.kafka.clients.producer.ProducerRecord; |
| import org.apache.kafka.clients.producer.RecordMetadata; |
| |
| import java.util.Properties; |
| import java.util.concurrent.ExecutionException; |
| |
| public class Producer extends Thread { |
| private final KafkaProducer<Integer, String> producer; |
| private final String topic; |
| private final Boolean isAsync; |
| |
| public Producer(String topic, Boolean isAsync) { |
| Properties props = new Properties(); |
| props.put("bootstrap.servers", KafkaProperties.KAFKA_SERVER_URL + ":" + KafkaProperties.KAFKA_SERVER_PORT); |
| props.put("client.id", "DemoProducer"); |
| props.put("key.serializer", "org.apache.kafka.common.serialization.IntegerSerializer"); |
| props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer"); |
| producer = new KafkaProducer<>(props); |
| this.topic = topic; |
| this.isAsync = isAsync; |
| } |
| |
| public void run() { |
| int messageNo = 1; |
| while (true) { |
| String messageStr = "Message_" + messageNo; |
| long startTime = System.currentTimeMillis(); |
| if (isAsync) { // Send asynchronously |
| producer.send(new ProducerRecord<>(topic, |
| messageNo, |
| messageStr), new DemoCallBack(startTime, messageNo, messageStr)); |
| } else { // Send synchronously |
| try { |
| producer.send(new ProducerRecord<>(topic, |
| messageNo, |
| messageStr)).get(); |
| System.out.println("Sent message: (" + messageNo + ", " + messageStr + ")"); |
| } catch (InterruptedException | ExecutionException e) { |
| e.printStackTrace(); |
| } |
| } |
| ++messageNo; |
| } |
| } |
| } |
| |
| class DemoCallBack implements Callback { |
| |
| private final long startTime; |
| private final int key; |
| private final String message; |
| |
| public DemoCallBack(long startTime, int key, String message) { |
| this.startTime = startTime; |
| this.key = key; |
| this.message = message; |
| } |
| |
| /** |
| * A callback method the user can implement to provide asynchronous handling of request completion. This method will |
| * be called when the record sent to the server has been acknowledged. Exactly one of the arguments will be |
| * non-null. |
| * |
| * @param metadata The metadata for the record that was sent (i.e. the partition and offset). Null if an error |
| * occurred. |
| * @param exception The exception thrown during processing of this record. Null if no error occurred. |
| */ |
| public void onCompletion(RecordMetadata metadata, Exception exception) { |
| long elapsedTime = System.currentTimeMillis() - startTime; |
| if (metadata != null) { |
| System.out.println( |
| "message(" + key + ", " + message + ") sent to partition(" + metadata.partition() + |
| "), " + |
| "offset(" + metadata.offset() + ") in " + elapsedTime + " ms"); |
| } else { |
| exception.printStackTrace(); |
| } |
| } |
| } |