forked from confluentinc/kafka-streams-examples
-
Notifications
You must be signed in to change notification settings - Fork 0
/
TableToTableJoinIntegrationTest.java
182 lines (159 loc) · 8.64 KB
/
TableToTableJoinIntegrationTest.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
/*
* 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.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.Consumed;
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);
}
}