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TableToTableJoinIntegrationTest.java
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TableToTableJoinIntegrationTest.java
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/*
* Copyright Confluent Inc.
*
* 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 io.confluent.examples.streams;
import io.confluent.examples.streams.kafka.EmbeddedSingleNodeKafkaCluster;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.common.serialization.LongSerializer;
import org.apache.kafka.common.serialization.Serde;
import org.apache.kafka.common.serialization.Serdes;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.apache.kafka.common.serialization.StringSerializer;
import org.apache.kafka.streams.Consumed;
import org.apache.kafka.streams.KafkaStreams;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.StreamsBuilder;
import org.apache.kafka.streams.StreamsConfig;
import org.apache.kafka.streams.kstream.KTable;
import org.apache.kafka.streams.kstream.Materialized;
import org.apache.kafka.streams.kstream.Produced;
import org.apache.kafka.streams.state.KeyValueIterator;
import org.apache.kafka.streams.state.QueryableStoreTypes;
import org.apache.kafka.streams.state.ReadOnlyKeyValueStore;
import org.apache.kafka.test.TestUtils;
import org.junit.BeforeClass;
import org.junit.ClassRule;
import org.junit.Test;
import java.util.Arrays;
import java.util.List;
import java.util.Properties;
import static org.assertj.core.api.Assertions.assertThat;
/**
* End-to-end integration test that demonstrates how to perform a join between two KTables.
* We also show how to assign a state store to the joined table, which is required to make it
* accessible for interactive queries.
*
* Note: This example uses lambda expressions and thus works with Java 8+ only.
*/
public class TableToTableJoinIntegrationTest {
@ClassRule
public static final EmbeddedSingleNodeKafkaCluster CLUSTER = new EmbeddedSingleNodeKafkaCluster();
private static final String userRegionTopic = "user-region-topic";
private static final String userLastLoginTopic = "user-last-login-topic";
private static final String outputTopic = "output-topic";
@BeforeClass
public static void startKafkaCluster() throws Exception {
CLUSTER.createTopic(userRegionTopic);
CLUSTER.createTopic(userLastLoginTopic);
CLUSTER.createTopic(outputTopic);
}
@Test
public void shouldJoinTwoTables() throws Exception {
// Input: Region per user (multiple records allowed per user).
List<KeyValue<String, String>> userRegionRecords = Arrays.asList(
new KeyValue<>("alice", "asia"),
new KeyValue<>("bob", "europe"),
new KeyValue<>("alice", "europe"),
new KeyValue<>("charlie", "europe"),
new KeyValue<>("bob", "asia")
);
// Input 2: Timestamp of last login per user (multiple records allowed per user)
List<KeyValue<String, Long>> userLastLoginRecords = Arrays.asList(
new KeyValue<>("alice", 1485500000L),
new KeyValue<>("bob", 1485520000L),
new KeyValue<>("alice", 1485530000L),
new KeyValue<>("bob", 1485560000L)
);
List<KeyValue<String, String>> expectedResults = Arrays.asList(
new KeyValue<>("alice", "europe/1485500000"),
new KeyValue<>("bob", "asia/1485520000"),
new KeyValue<>("alice", "europe/1485530000"),
new KeyValue<>("bob", "asia/1485560000")
);
List<KeyValue<String, String>> expectedResultsForJoinStateStore = Arrays.asList(
new KeyValue<>("alice", "europe/1485530000"),
new KeyValue<>("bob", "asia/1485560000")
);
//
// Step 1: Configure and start the processor topology.
//
final Serde<String> stringSerde = Serdes.String();
final Serde<Long> longSerde = Serdes.Long();
Properties streamsConfiguration = new Properties();
streamsConfiguration.put(StreamsConfig.APPLICATION_ID_CONFIG, "table-table-join-lambda-integration-test");
streamsConfiguration.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, CLUSTER.bootstrapServers());
streamsConfiguration.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
streamsConfiguration.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
// For didactic reasons: disable record caching so we can observe every individual update record being sent downstream
streamsConfiguration.put(StreamsConfig.CACHE_MAX_BYTES_BUFFERING_CONFIG, 0);
// The commit interval for flushing records to state stores and downstream must be lower than
// this integration test's timeout (30 secs) to ensure we observe the expected processing results.
streamsConfiguration.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, 10 * 1000);
streamsConfiguration.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
// Use a temporary directory for storing state, which will be automatically removed after the test.
streamsConfiguration.put(StreamsConfig.STATE_DIR_CONFIG, TestUtils.tempDirectory().getAbsolutePath());
StreamsBuilder builder = new StreamsBuilder();
KTable<String, String> userRegions = builder.table(userRegionTopic);
KTable<String, Long> userLastLogins = builder.table(userLastLoginTopic, Consumed.with(stringSerde, longSerde));
String storeName = "joined-store";
userRegions.join(userLastLogins,
(regionValue, lastLoginValue) -> regionValue + "/" + lastLoginValue,
Materialized.as(storeName))
.toStream()
.to(outputTopic, Produced.with(Serdes.String(), Serdes.String()));
KafkaStreams streams = new KafkaStreams(builder.build(), streamsConfiguration);
streams.start();
//
// Step 2: Publish user regions.
//
Properties regionsProducerConfig = new Properties();
regionsProducerConfig.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, CLUSTER.bootstrapServers());
regionsProducerConfig.put(ProducerConfig.ACKS_CONFIG, "all");
regionsProducerConfig.put(ProducerConfig.RETRIES_CONFIG, 0);
regionsProducerConfig.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
regionsProducerConfig.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
IntegrationTestUtils.produceKeyValuesSynchronously(userRegionTopic, userRegionRecords, regionsProducerConfig);
//
// Step 3: Publish user's last login timestamps.
//
Properties lastLoginProducerConfig = new Properties();
lastLoginProducerConfig.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, CLUSTER.bootstrapServers());
lastLoginProducerConfig.put(ProducerConfig.ACKS_CONFIG, "all");
lastLoginProducerConfig.put(ProducerConfig.RETRIES_CONFIG, 0);
lastLoginProducerConfig.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
lastLoginProducerConfig.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, LongSerializer.class);
IntegrationTestUtils.produceKeyValuesSynchronously(userLastLoginTopic, userLastLoginRecords, lastLoginProducerConfig);
//
// Step 4: Verify the application's output data.
//
Properties consumerConfig = new Properties();
consumerConfig.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, CLUSTER.bootstrapServers());
consumerConfig.put(ConsumerConfig.GROUP_ID_CONFIG, "stream-stream-join-lambda-integration-test-standard-consumer");
consumerConfig.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
consumerConfig.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
consumerConfig.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
List<KeyValue<String, String>> actualResults = IntegrationTestUtils.waitUntilMinKeyValueRecordsReceived(consumerConfig,
outputTopic, expectedResults.size());
// Verify the (local) state store of the joined table.
// For a comprehensive demonstration of interactive queries please refer to KafkaMusicExample.
ReadOnlyKeyValueStore<String, String> readOnlyKeyValueStore =
streams.store(storeName, QueryableStoreTypes.keyValueStore());
KeyValueIterator<String, String> keyValueIterator = readOnlyKeyValueStore.all();
assertThat(keyValueIterator).containsExactlyElementsOf(expectedResultsForJoinStateStore);
streams.close();
assertThat(actualResults).containsExactlyElementsOf(expectedResults);
}
}