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| 1 | +package com.example.kafkacluster; |
| 2 | + |
| 3 | +import org.apache.kafka.common.Uuid; |
| 4 | +import org.awaitility.Awaitility; |
| 5 | +import org.testcontainers.containers.Container; |
| 6 | +import org.testcontainers.containers.GenericContainer; |
| 7 | +import org.testcontainers.containers.Network; |
| 8 | +import org.testcontainers.kafka.KafkaContainer; |
| 9 | +import org.testcontainers.lifecycle.Startable; |
| 10 | +import org.testcontainers.utility.DockerImageName; |
| 11 | + |
| 12 | +import java.time.Duration; |
| 13 | +import java.util.Collection; |
| 14 | +import java.util.stream.Collectors; |
| 15 | +import java.util.stream.IntStream; |
| 16 | + |
| 17 | +import static org.assertj.core.api.Assertions.assertThat; |
| 18 | + |
| 19 | +public class ApacheKafkaContainerCluster implements Startable { |
| 20 | + |
| 21 | + private final int brokersNum; |
| 22 | + |
| 23 | + private final Network network; |
| 24 | + |
| 25 | + private final Collection<KafkaContainer> brokers; |
| 26 | + |
| 27 | + public ApacheKafkaContainerCluster(String version, int brokersNum, int internalTopicsRf) { |
| 28 | + if (brokersNum < 0) { |
| 29 | + throw new IllegalArgumentException("brokersNum '" + brokersNum + "' must be greater than 0"); |
| 30 | + } |
| 31 | + if (internalTopicsRf < 0 || internalTopicsRf > brokersNum) { |
| 32 | + throw new IllegalArgumentException( |
| 33 | + "internalTopicsRf '" + internalTopicsRf + "' must be less than brokersNum and greater than 0" |
| 34 | + ); |
| 35 | + } |
| 36 | + |
| 37 | + this.brokersNum = brokersNum; |
| 38 | + this.network = Network.newNetwork(); |
| 39 | + |
| 40 | + String controllerQuorumVoters = IntStream |
| 41 | + .range(0, brokersNum) |
| 42 | + .mapToObj(brokerNum -> String.format("%d@broker-%d:9094", brokerNum, brokerNum)) |
| 43 | + .collect(Collectors.joining(",")); |
| 44 | + |
| 45 | + String clusterId = Uuid.randomUuid().toString(); |
| 46 | + |
| 47 | + this.brokers = |
| 48 | + IntStream |
| 49 | + .range(0, brokersNum) |
| 50 | + .mapToObj(brokerNum -> { |
| 51 | + return new KafkaContainer(DockerImageName.parse("apache/kafka").withTag(version)) |
| 52 | + .withNetwork(this.network) |
| 53 | + .withNetworkAliases("broker-" + brokerNum) |
| 54 | + .withEnv("CLUSTER_ID", clusterId) |
| 55 | + .withEnv("KAFKA_BROKER_ID", brokerNum + "") |
| 56 | + .withEnv("KAFKA_NODE_ID", brokerNum + "") |
| 57 | + .withEnv("KAFKA_CONTROLLER_QUORUM_VOTERS", controllerQuorumVoters) |
| 58 | + .withEnv("KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR", internalTopicsRf + "") |
| 59 | + .withEnv("KAFKA_GROUP_INITIAL_REBALANCE_DELAY_MS", "0") |
| 60 | + .withEnv("KAFKA_OFFSETS_TOPIC_NUM_PARTITIONS", internalTopicsRf + "") |
| 61 | + .withEnv("KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR", internalTopicsRf + "") |
| 62 | + .withEnv("KAFKA_TRANSACTION_STATE_LOG_MIN_ISR", internalTopicsRf + "") |
| 63 | + .withStartupTimeout(Duration.ofMinutes(1)); |
| 64 | + }) |
| 65 | + .collect(Collectors.toList()); |
| 66 | + } |
| 67 | + |
| 68 | + public Collection<KafkaContainer> getBrokers() { |
| 69 | + return this.brokers; |
| 70 | + } |
| 71 | + |
| 72 | + public String getBootstrapServers() { |
| 73 | + return brokers.stream().map(KafkaContainer::getBootstrapServers).collect(Collectors.joining(",")); |
| 74 | + } |
| 75 | + |
| 76 | + @Override |
| 77 | + public void start() { |
| 78 | + // Needs to start all the brokers at once |
| 79 | + brokers.parallelStream().forEach(GenericContainer::start); |
| 80 | + |
| 81 | + Awaitility |
| 82 | + .await() |
| 83 | + .atMost(Duration.ofSeconds(30)) |
| 84 | + .untilAsserted(() -> { |
| 85 | + Container.ExecResult result = |
| 86 | + this.brokers.stream() |
| 87 | + .findFirst() |
| 88 | + .get() |
| 89 | + .execInContainer( |
| 90 | + "sh", |
| 91 | + "-c", |
| 92 | + "/opt/kafka/bin/kafka-log-dirs.sh --bootstrap-server localhost:9093 --describe | grep -o '\"broker\"' | wc -l" |
| 93 | + ); |
| 94 | + String brokers = result.getStdout().replace("\n", ""); |
| 95 | + |
| 96 | + assertThat(brokers).asInt().isEqualTo(this.brokersNum); |
| 97 | + }); |
| 98 | + } |
| 99 | + |
| 100 | + @Override |
| 101 | + public void stop() { |
| 102 | + this.brokers.stream().parallel().forEach(GenericContainer::stop); |
| 103 | + } |
| 104 | +} |
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