samza-api/src/test/java/org/apache/samza/system/descriptors/TestSimpleInputDescriptor.java

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 * to you 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
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package org.apache.samza.system.descriptors;

import java.util.Collections;
import org.apache.samza.system.descriptors.examples.serde.ExampleSimpleInputDescriptor;
import org.apache.samza.system.descriptors.examples.serde.ExampleSimpleOutputDescriptor;
import org.apache.samza.system.descriptors.examples.serde.ExampleSimpleSystemDescriptor;
import org.apache.samza.serializers.IntegerSerde;
import org.apache.samza.system.SystemStreamMetadata;
import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;

public class TestSimpleInputDescriptor {
  @Test
  public void testAPIUsage() {
    // does not assert anything, but acts as a compile-time check on expected descriptor type parameters
    // and validates that the method calls can be chained.
    ExampleSimpleSystemDescriptor kafkaSystem =
        new ExampleSimpleSystemDescriptor("kafka-system")
            .withSystemConfigs(Collections.emptyMap());
    ExampleSimpleInputDescriptor<Integer> input1 = kafkaSystem.getInputDescriptor("input1", new IntegerSerde());
    ExampleSimpleOutputDescriptor<Integer> output1 = kafkaSystem.getOutputDescriptor("output1", new IntegerSerde());

    input1
        .shouldBootstrap()
        .withOffsetDefault(SystemStreamMetadata.OffsetType.NEWEST)
        .withPriority(1)
        .shouldResetOffset()
        .withStreamConfigs(Collections.emptyMap());

    output1
        .withStreamConfigs(Collections.emptyMap());
  }

  @Test
  public void testISDObjectsWithOverrides() {
    ExampleSimpleSystemDescriptor ssd = new ExampleSimpleSystemDescriptor("kafka-system");
    IntegerSerde streamSerde = new IntegerSerde();
    ExampleSimpleInputDescriptor<Integer> isd = ssd.getInputDescriptor("input-stream", streamSerde);

    assertEquals(streamSerde, isd.getSerde());
    assertFalse(isd.getTransformer().isPresent());
  }
}