juplo.de Git - demos/kafka/wordcount/blob - src/test/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessorTopologyTest.java

   1 package de.juplo.kafka.wordcount.top10;
   2
   3 import de.juplo.kafka.wordcount.counter.TestCounter;
   4 import de.juplo.kafka.wordcount.counter.TestWord;
   5 import lombok.extern.slf4j.Slf4j;
   6 import org.apache.kafka.streams.TestInputTopic;
   7 import org.apache.kafka.streams.TestOutputTopic;
   8 import org.apache.kafka.streams.Topology;
   9 import org.apache.kafka.streams.TopologyTestDriver;
  10 import org.apache.kafka.streams.state.KeyValueStore;
  11 import org.apache.kafka.streams.state.Stores;
  12 import org.junit.jupiter.api.AfterEach;
  13 import org.junit.jupiter.api.BeforeEach;
  14 import org.junit.jupiter.api.Test;
  15 import org.springframework.kafka.support.serializer.JsonDeserializer;
  16 import org.springframework.kafka.support.serializer.JsonSerializer;
  17 import org.springframework.util.LinkedMultiValueMap;
  18 import org.springframework.util.MultiValueMap;
  19
  20 import java.util.Map;
  21 import java.util.stream.Stream;
  22
  23 import static de.juplo.kafka.wordcount.top10.Top10ApplicationConfiguration.serializationConfig;
  24
  25
  26 @Slf4j
  27 public class Top10StreamProcessorTopologyTest
  28 {
  29   public static final String IN = "TEST-IN";
  30   public static final String OUT = "TEST-OUT";
  31   public static final String STORE_NAME = "TOPOLOGY-TEST";
  32
  33
  34   TopologyTestDriver testDriver;
  35   TestInputTopic<Key, Entry> in;
  36   TestOutputTopic<User, Ranking> out;
  37
  38
  39   @BeforeEach
  40   public void setUp()
  41   {
  42     Topology topology = Top10StreamProcessor.buildTopology(
  43         IN,
  44         OUT,
  45         Stores.inMemoryKeyValueStore(STORE_NAME));
  46
  47     testDriver = new TopologyTestDriver(topology, serializationConfig());
  48
  49     in = testDriver.createInputTopic(
  50         IN,
  51         jsonSerializer(Key.class, true),
  52         jsonSerializer(Entry.class,false));
  53
  54     out = testDriver.createOutputTopic(
  55         OUT,
  56         new JsonDeserializer()
  57             .copyWithType(User.class)
  58             .ignoreTypeHeaders(),
  59         new JsonDeserializer()
  60             .copyWithType(Ranking.class)
  61             .ignoreTypeHeaders());
  62
  63   }
  64
  65
  66   @Test
  67   public void test()
  68   {
  69     Stream
  70         .of(TestData.INPUT_MESSAGES)
  71         .forEach(kv -> in.pipeInput(
  72             Key.of(kv.key.getUser(), kv.key.getWord()),
  73             Entry.of(kv.value.getWord(), kv.value.getCounter())));
  74
  75     MultiValueMap<User, Ranking> receivedMessages = new LinkedMultiValueMap<>();
  76     out
  77         .readRecordsToList()
  78         .forEach(record -> receivedMessages.add(record.key(), record.value()));
  79
  80     TestData.assertExpectedMessages(receivedMessages);
  81
  82     TestData.assertExpectedNumberOfMessagesForUsers(receivedMessages);
  83     TestData.assertExpectedLastMessagesForUsers(receivedMessages);
  84
  85     KeyValueStore<User, Ranking> store = testDriver.getKeyValueStore(STORE_NAME);
  86     TestData.assertExpectedState(store);
  87   }
  88
  89   @AfterEach
  90   public void tearDown()
  91   {
  92     testDriver.close();
  93   }
  94
  95   private <T> JsonSerializer<T> jsonSerializer(Class<T> type, boolean isKey)
  96   {
  97     JsonSerializer<T> jsonSerializer = new JsonSerializer<>();
  98     jsonSerializer.configure(
  99         Map.of(
 100             JsonSerializer.TYPE_MAPPINGS,
 101             "word:" + TestWord.class.getName() + "," +
 102             "counter:" + TestCounter.class.getName()),
 103         isKey);
 104     return jsonSerializer;
 105   }
 106 }