samza-kafka/src/test/java/org/apache/samza/system/kafka/descriptors/TestKafkaInputDescriptor.java

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package org.apache.samza.system.kafka.descriptors;

import com.google.common.collect.ImmutableList;

import java.util.Map;
import org.apache.samza.operators.KV;
import org.apache.samza.serializers.IntegerSerde;
import org.apache.samza.serializers.KVSerde;
import org.apache.samza.serializers.StringSerde;
import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class TestKafkaInputDescriptor {
  @Test
  public void testISDConfigsWithOverrides() {
    KafkaSystemDescriptor sd = new KafkaSystemDescriptor("kafka");

    KafkaInputDescriptor<KV<String, Integer>> isd =
        sd.getInputDescriptor("input-stream", KVSerde.of(new StringSerde(), new IntegerSerde()))
            .withConsumerAutoOffsetReset("largest")
            .withConsumerFetchMessageMaxBytes(1024 * 1024);

    Map<String, String> generatedConfigs = isd.toConfig();
    assertEquals("kafka", generatedConfigs.get("streams.input-stream.samza.system"));
    assertEquals("largest", generatedConfigs.get("systems.kafka.streams.input-stream.consumer.auto.offset.reset"));
    assertEquals("1048576", generatedConfigs.get("systems.kafka.streams.input-stream.consumer.fetch.message.max.bytes"));
  }

  @Test
  public void testISDConfigsWithDefaults() {
    KafkaSystemDescriptor sd = new KafkaSystemDescriptor("kafka")
        .withConsumerZkConnect(ImmutableList.of("localhost:123"))
        .withProducerBootstrapServers(ImmutableList.of("localhost:567", "localhost:890"));

    KafkaInputDescriptor<KV<String, Integer>> isd =
        sd.getInputDescriptor("input-stream", KVSerde.of(new StringSerde(), new IntegerSerde()));

    Map<String, String> generatedConfigs = isd.toConfig();
    assertEquals("kafka", generatedConfigs.get("streams.input-stream.samza.system"));
    assertEquals(1, generatedConfigs.size()); // verify that there are no other configs
  }
}