samza-sql/src/test/java/org/apache/samza/sql/udf/impl/TestReflectionBasedUdfResolver.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
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 *   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.samza.sql.udf.impl;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import org.apache.samza.config.Config;
import org.apache.samza.config.MapConfig;
import org.apache.samza.sql.interfaces.UdfMetadata;
import org.apache.samza.sql.schema.SamzaSqlFieldType;
import org.apache.samza.sql.udf.ReflectionBasedUdfResolver;
import org.junit.Assert;
import org.junit.Test;

import java.lang.reflect.Method;
import java.util.Collection;

public class TestReflectionBasedUdfResolver {

  @Test
  public void testShouldReturnNothingWhenNoUDFIsInPackagePrefix() {
    Config config = new MapConfig(ImmutableMap.of("samza.sql.udf.resolver.package.prefix", "org.apache.samza.udf.blah.blah"));
    ReflectionBasedUdfResolver reflectionBasedUdfResolver = new ReflectionBasedUdfResolver(config);
    Collection<UdfMetadata> udfMetadataList = reflectionBasedUdfResolver.getUdfs();

    Assert.assertEquals(0, udfMetadataList.size());
  }

  @Test
  public void testUDfResolverShouldReturnAllUDFInClassPath() throws NoSuchMethodException {
    Config config = new MapConfig(ImmutableMap.of("samza.sql.udf.resolver.package.filter", "org.apache.samza.sql.udf.impl"));
    ReflectionBasedUdfResolver reflectionBasedUdfResolver = new ReflectionBasedUdfResolver(config);
    Collection<UdfMetadata> udfMetadataList = reflectionBasedUdfResolver.getUdfs();

    Method method = TestSamzaSqlUdf.class.getMethod("execute", String.class);
    UdfMetadata udfMetadata = new UdfMetadata("TestSamzaSqlUdf",
            "Test samza sql udf implementation", method, new MapConfig(), ImmutableList.of(SamzaSqlFieldType.STRING),
               SamzaSqlFieldType.STRING, true);

    Assert.assertArrayEquals(new UdfMetadata[]{udfMetadata}, udfMetadataList.toArray(new UdfMetadata[0]));
  }
}