/**
* 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.camel.component.kafka;
import java.util.Properties;
import org.apache.camel.EndpointInject;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.mock.MockEndpoint;
import org.apache.camel.impl.JndiRegistry;
import org.apache.camel.impl.MemoryStateRepository;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.junit.After;
import org.junit.Test;
public class KafkaConsumerOffsetRepositoryResumeTest extends BaseEmbeddedKafkaTest {
private static final String TOPIC = "offset-resume";
@EndpointInject(uri = "mock:result")
private MockEndpoint result;
private org.apache.kafka.clients.producer.KafkaProducer<String, String> producer;
private MemoryStateRepository stateRepository;
@Override
protected void doPreSetup() throws Exception {
Properties props = getDefaultProperties();
producer = new org.apache.kafka.clients.producer.KafkaProducer<>(props);
// Create the topic with 2 partitions + send 10 messages (5 in each partitions)
kafkaBroker.createTopic(TOPIC, 2);
for (int i = 0; i < 10; i++) {
producer.send(new ProducerRecord<>(TOPIC, i % 2, "key", "message-" + i));
}
// Create the state repository with some initial offsets
stateRepository = new MemoryStateRepository();
stateRepository.setState(TOPIC + "/0", "2");
stateRepository.setState(TOPIC + "/1", "3");
}
@After
public void after() {
if (producer != null) {
producer.close();
}
stateRepository = null;
}
/**
* Given an offset repository with values
* When consuming with this repository
* Then we're consuming from the saved offsets
*/
@Test
public void shouldResumeFromAnyParticularOffset() throws InterruptedException {
result.expectedMessageCount(3);
result.expectedBodiesReceivedInAnyOrder("message-6", "message-8", "message-9");
result.assertIsSatisfied(3000);
assertEquals("partition-0", "4", stateRepository.getState(TOPIC + "/0"));
assertEquals("partition-1", "4", stateRepository.getState(TOPIC + "/1"));
}
@Override
protected JndiRegistry createRegistry() throws Exception {
JndiRegistry registry = super.createRegistry();
registry.bind("offset", stateRepository);
return registry;
}
@Override
protected RouteBuilder createRouteBuilder() throws Exception {
return new RouteBuilder() {
@Override
public void configure() throws Exception {
from("kafka:" + TOPIC
+ "?groupId=A"
+ "&autoOffsetReset=earliest" // Ask to start from the beginning if we have unknown offset
+ "&consumersCount=2" // We have 2 partitions, we want 1 consumer per partition
+ "&offsetRepository=#offset") // Keep the offset in our repository
.to("mock:result");
}
};
}
}