connect/runtime/src/test/java/org/apache/kafka/connect/runtime/ConnectorConfigTest.java - kafka - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements. See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.
  * The ASF licenses this file 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
  *
  * 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 org.apache.kafka.connect.runtime;

 import org.apache.kafka.common.config.ConfigDef;
 import org.apache.kafka.common.config.ConfigException;
 import org.apache.kafka.connect.connector.ConnectRecord;
 import org.apache.kafka.connect.connector.Connector;
 import org.apache.kafka.connect.runtime.isolation.PluginDesc;
 import org.apache.kafka.connect.runtime.isolation.Plugins;
 import org.apache.kafka.connect.sink.SinkRecord;
 import org.apache.kafka.connect.transforms.Transformation;
 import org.apache.kafka.connect.transforms.predicates.Predicate;
 import org.junit.Test;

 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;

 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertThrows;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;

 public class ConnectorConfigTest<R extends ConnectRecord<R>> {

     public static final Plugins MOCK_PLUGINS = new Plugins(new HashMap<>()) {
         @Override
         public Set<PluginDesc<Transformation<?>>> transformations() {
             return Collections.emptySet();
         }
     };

     private static final SinkRecord DUMMY_RECORD = new SinkRecord(null, 0, null, null, null, null, 0L);

     public static abstract class TestConnector extends Connector {
     }

     public static class SimpleTransformation<R extends ConnectRecord<R>> implements Transformation<R>  {

         int magicNumber = 0;

         @Override
         public void configure(Map<String, ?> props) {
             magicNumber = Integer.parseInt((String) props.get("magic.number"));
         }

         @Override
         public R apply(R record) {
             return record.newRecord(null, magicNumber, null, null, null, null, 0L);
         }

         @Override
         public void close() {
             magicNumber = 0;
         }

         @Override
         public ConfigDef config() {
             return new ConfigDef()
                     .define("magic.number", ConfigDef.Type.INT, ConfigDef.NO_DEFAULT_VALUE, ConfigDef.Range.atLeast(42), ConfigDef.Importance.HIGH, "");
         }
     }

     @Test
     public void noTransforms() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         new ConnectorConfig(MOCK_PLUGINS, props);
     }

     @Test
     public void danglingTransformAlias() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "dangler");
         ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
         assertTrue(e.getMessage().contains("Not a Transformation"));
     }

     @Test
     public void emptyConnectorName() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "");
         props.put("connector.class", TestConnector.class.getName());
         ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
         assertTrue(e.getMessage().contains("String may not be empty"));
     }

     @Test
     public void wrongTransformationType() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a");
         props.put("transforms.a.type", "uninstantiable");
         ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
         assertTrue(e.getMessage().contains("Class uninstantiable could not be found"));
     }

     @Test
     public void unconfiguredTransform() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a");
         props.put("transforms.a.type", SimpleTransformation.class.getName());
         ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
         assertTrue(e.getMessage().contains("Missing required configuration \"transforms.a.magic.number\" which"));
     }

     @Test
     public void misconfiguredTransform() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a");
         props.put("transforms.a.type", SimpleTransformation.class.getName());
         props.put("transforms.a.magic.number", "40");
         ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
         assertTrue(e.getMessage().contains("Value must be at least 42"));
     }

     @Test
     public void singleTransform() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a");
         props.put("transforms.a.type", SimpleTransformation.class.getName());
         props.put("transforms.a.magic.number", "42");
         final ConnectorConfig config = new ConnectorConfig(MOCK_PLUGINS, props);
         final List<TransformationStage<SinkRecord>> transformationStages = config.transformationStages();
         assertEquals(1, transformationStages.size());
         final TransformationStage<SinkRecord> stage = transformationStages.get(0);
         assertEquals(SimpleTransformation.class, stage.transformClass());
         assertEquals(42, stage.apply(DUMMY_RECORD).kafkaPartition().intValue());
     }

     @Test
     public void multipleTransformsOneDangling() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a, b");
         props.put("transforms.a.type", SimpleTransformation.class.getName());
         props.put("transforms.a.magic.number", "42");
         assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
     }

     @Test
     public void multipleTransforms() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a, b");
         props.put("transforms.a.type", SimpleTransformation.class.getName());
         props.put("transforms.a.magic.number", "42");
         props.put("transforms.b.type", SimpleTransformation.class.getName());
         props.put("transforms.b.magic.number", "84");
         final ConnectorConfig config = new ConnectorConfig(MOCK_PLUGINS, props);
         final List<TransformationStage<SinkRecord>> transformationStages = config.transformationStages();
         assertEquals(2, transformationStages.size());
         assertEquals(42, transformationStages.get(0).apply(DUMMY_RECORD).kafkaPartition().intValue());
         assertEquals(84, transformationStages.get(1).apply(DUMMY_RECORD).kafkaPartition().intValue());
     }

     @Test
     public void abstractTransform() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a");
         props.put("transforms.a.type", AbstractTransformation.class.getName());
         try {
             new ConnectorConfig(MOCK_PLUGINS, props);
         } catch (ConfigException ex) {
             assertTrue(
                 ex.getMessage().contains("Transformation is abstract and cannot be created.")
             );
         }
     }
     @Test
     public void abstractKeyValueTransform() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a");
         props.put("transforms.a.type", AbstractKeyValueTransformation.class.getName());
         try {
             new ConnectorConfig(MOCK_PLUGINS, props);
         } catch (ConfigException ex) {
             assertTrue(
                 ex.getMessage().contains("Transformation is abstract and cannot be created.")
             );
             assertTrue(
                 ex.getMessage().contains(AbstractKeyValueTransformation.Key.class.getName())
             );
             assertTrue(
                 ex.getMessage().contains(AbstractKeyValueTransformation.Value.class.getName())
             );
         }
     }

     @Test
     public void wrongPredicateType() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a");
         props.put("transforms.a.type", SimpleTransformation.class.getName());
         props.put("transforms.a.magic.number", "42");
         props.put("transforms.a.predicate", "my-pred");
         props.put("predicates", "my-pred");
         props.put("predicates.my-pred.type", TestConnector.class.getName());
         ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
         assertTrue(e.getMessage().contains("Not a Predicate"));
     }

     @Test
     public void singleConditionalTransform() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a");
         props.put("transforms.a.type", SimpleTransformation.class.getName());
         props.put("transforms.a.magic.number", "42");
         props.put("transforms.a.predicate", "my-pred");
         props.put("transforms.a.negate", "true");
         props.put("predicates", "my-pred");
         props.put("predicates.my-pred.type", TestPredicate.class.getName());
         props.put("predicates.my-pred.int", "84");
         assertTransformationStageWithPredicate(props, true);
     }

     @Test
     public void predicateNegationDefaultsToFalse() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a");
         props.put("transforms.a.type", SimpleTransformation.class.getName());
         props.put("transforms.a.magic.number", "42");
         props.put("transforms.a.predicate", "my-pred");
         props.put("predicates", "my-pred");
         props.put("predicates.my-pred.type", TestPredicate.class.getName());
         props.put("predicates.my-pred.int", "84");
         assertTransformationStageWithPredicate(props, false);
     }

     @Test
     public void abstractPredicate() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a");
         props.put("transforms.a.type", SimpleTransformation.class.getName());
         props.put("transforms.a.magic.number", "42");
         props.put("transforms.a.predicate", "my-pred");
         props.put("predicates", "my-pred");
         props.put("predicates.my-pred.type", AbstractTestPredicate.class.getName());
         props.put("predicates.my-pred.int", "84");
         ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
         assertTrue(e.getMessage().contains("Predicate is abstract and cannot be created"));
     }

     private void assertTransformationStageWithPredicate(Map<String, String> props, boolean expectedNegated) {
         final ConnectorConfig config = new ConnectorConfig(MOCK_PLUGINS, props);
         final List<TransformationStage<SinkRecord>> transformationStages = config.transformationStages();
         assertEquals(1, transformationStages.size());
         TransformationStage<SinkRecord> stage = transformationStages.get(0);

         assertEquals(expectedNegated ? 42 : 0, stage.apply(DUMMY_RECORD).kafkaPartition().intValue());

         SinkRecord matchingRecord = DUMMY_RECORD.newRecord(null, 84, null, null, null, null, 0L);
         assertEquals(expectedNegated ? 84 : 42, stage.apply(matchingRecord).kafkaPartition().intValue());
         assertEquals(SimpleTransformation.class, stage.transformClass());

         stage.close();
     }

     @Test
     public void misconfiguredPredicate() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a");
         props.put("transforms.a.type", SimpleTransformation.class.getName());
         props.put("transforms.a.magic.number", "42");
         props.put("transforms.a.predicate", "my-pred");
         props.put("transforms.a.negate", "true");
         props.put("predicates", "my-pred");
         props.put("predicates.my-pred.type", TestPredicate.class.getName());
         props.put("predicates.my-pred.int", "79");
         try {
             new ConnectorConfig(MOCK_PLUGINS, props);
             fail();
         } catch (ConfigException e) {
             assertTrue(e.getMessage().contains("Value must be at least 80"));
         }
     }

     @Test
     public void missingPredicateAliasProperty() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a");
         props.put("transforms.a.type", SimpleTransformation.class.getName());
         props.put("transforms.a.magic.number", "42");
         props.put("transforms.a.predicate", "my-pred");
         // technically not needed
         //props.put("predicates", "my-pred");
         props.put("predicates.my-pred.type", TestPredicate.class.getName());
         props.put("predicates.my-pred.int", "84");
         new ConnectorConfig(MOCK_PLUGINS, props);
     }

     @Test
     public void missingPredicateConfig() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a");
         props.put("transforms.a.type", SimpleTransformation.class.getName());
         props.put("transforms.a.magic.number", "42");
         props.put("transforms.a.predicate", "my-pred");
         props.put("predicates", "my-pred");
         //props.put("predicates.my-pred.type", TestPredicate.class.getName());
         //props.put("predicates.my-pred.int", "84");
         ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
         assertTrue(e.getMessage().contains("Not a Predicate"));
     }

     @Test
     public void negatedButNoPredicate() {
         Map<String, String> props = new HashMap<>();
         props.put("name", "test");
         props.put("connector.class", TestConnector.class.getName());
         props.put("transforms", "a");
         props.put("transforms.a.type", SimpleTransformation.class.getName());
         props.put("transforms.a.magic.number", "42");
         props.put("transforms.a.negate", "true");
         ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
         assertTrue(e.getMessage().contains("there is no config 'transforms.a.predicate' defining a predicate to be negated"));
     }

     public static class TestPredicate<R extends ConnectRecord<R>> implements Predicate<R>  {

         int param;

         public TestPredicate() { }

         @Override
         public ConfigDef config() {
             return new ConfigDef().define("int", ConfigDef.Type.INT, 80, ConfigDef.Range.atLeast(80), ConfigDef.Importance.MEDIUM,
                     "A test parameter");
         }

         @Override
         public boolean test(R record) {
             return record.kafkaPartition() == param;
         }

         @Override
         public void close() {
             param = 0;
         }

         @Override
         public void configure(Map<String, ?> configs) {
             param = Integer.parseInt((String) configs.get("int"));
         }
     }

     public static abstract class AbstractTestPredicate<R extends ConnectRecord<R>> implements Predicate<R>  {

         public AbstractTestPredicate() { }

     }

     public static abstract class AbstractTransformation<R extends ConnectRecord<R>> implements Transformation<R>  {

     }

     public static abstract class AbstractKeyValueTransformation<R extends ConnectRecord<R>> implements Transformation<R>  {
         @Override
         public R apply(R record) {
             return null;
         }

         @Override
         public ConfigDef config() {
             return new ConfigDef();
         }

         @Override
         public void close() {

         }

         @Override
         public void configure(Map<String, ?> configs) {

         }


         public static class Key<R extends ConnectRecord<R>> extends AbstractKeyValueTransformation<R> {


         }
         public static class Value<R extends ConnectRecord<R>> extends AbstractKeyValueTransformation<R> {

         }
     }

     @Test
     public void testEnrichedConfigDef() {
         String alias = "hdt";
         String prefix = ConnectorConfig.TRANSFORMS_CONFIG + "." + alias + ".";
         Map<String, String> props = new HashMap<>();
         props.put(ConnectorConfig.TRANSFORMS_CONFIG, alias);
         props.put(prefix + "type", HasDuplicateConfigTransformation.class.getName());
         ConfigDef def = ConnectorConfig.enrich(MOCK_PLUGINS, new ConfigDef(), props, false);
         assertEnrichedConfigDef(def, prefix, HasDuplicateConfigTransformation.MUST_EXIST_KEY, ConfigDef.Type.BOOLEAN);
         assertEnrichedConfigDef(def, prefix, TransformationStage.PREDICATE_CONFIG, ConfigDef.Type.STRING);
         assertEnrichedConfigDef(def, prefix, TransformationStage.NEGATE_CONFIG, ConfigDef.Type.BOOLEAN);
     }

     private static void assertEnrichedConfigDef(ConfigDef def, String prefix, String keyName, ConfigDef.Type expectedType) {
         assertNull(def.configKeys().get(keyName));
         ConfigDef.ConfigKey configKey = def.configKeys().get(prefix + keyName);
         assertNotNull(prefix + keyName + "' config must be present", configKey);
         assertEquals(prefix + keyName + "' config should be a " + expectedType, expectedType, configKey.type);
     }

     public static class HasDuplicateConfigTransformation<R extends ConnectRecord<R>> implements Transformation<R> {
         private static final String MUST_EXIST_KEY = "must.exist.key";
         private static final ConfigDef CONFIG_DEF = new ConfigDef()
                 // this configDef is duplicate. It should be removed automatically so as to avoid duplicate config error.
                 .define(TransformationStage.PREDICATE_CONFIG, ConfigDef.Type.INT, ConfigDef.NO_DEFAULT_VALUE, ConfigDef.Importance.MEDIUM, "fake")
                 // this configDef is duplicate. It should be removed automatically so as to avoid duplicate config error.
                 .define(TransformationStage.NEGATE_CONFIG, ConfigDef.Type.INT, 123, ConfigDef.Importance.MEDIUM, "fake")
                 // this configDef should appear if above duplicate configDef is removed without any error
                 .define(MUST_EXIST_KEY, ConfigDef.Type.BOOLEAN, true, ConfigDef.Importance.MEDIUM, "this key must exist");

         @Override
         public R apply(R record) {
             return record;
         }

         @Override
         public ConfigDef config() {
             return CONFIG_DEF;
         }

         @Override
         public void close() {
         }

         @Override
         public void configure(Map<String, ?> configs) {
         }
     }
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file 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
	*
	* 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 org.apache.kafka.connect.runtime;

	import org.apache.kafka.common.config.ConfigDef;
	import org.apache.kafka.common.config.ConfigException;
	import org.apache.kafka.connect.connector.ConnectRecord;
	import org.apache.kafka.connect.connector.Connector;
	import org.apache.kafka.connect.runtime.isolation.PluginDesc;
	import org.apache.kafka.connect.runtime.isolation.Plugins;
	import org.apache.kafka.connect.sink.SinkRecord;
	import org.apache.kafka.connect.transforms.Transformation;
	import org.apache.kafka.connect.transforms.predicates.Predicate;
	import org.junit.Test;

	import java.util.Collections;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;
	import java.util.Set;

	import static org.junit.Assert.assertEquals;
	import static org.junit.Assert.assertNotNull;
	import static org.junit.Assert.assertNull;
	import static org.junit.Assert.assertThrows;
	import static org.junit.Assert.assertTrue;
	import static org.junit.Assert.fail;

	public class ConnectorConfigTest<R extends ConnectRecord<R>> {

	public static final Plugins MOCK_PLUGINS = new Plugins(new HashMap<>()) {
	@Override
	public Set<PluginDesc<Transformation<?>>> transformations() {
	return Collections.emptySet();
	}
	};

	private static final SinkRecord DUMMY_RECORD = new SinkRecord(null, 0, null, null, null, null, 0L);

	public static abstract class TestConnector extends Connector {
	}

	public static class SimpleTransformation<R extends ConnectRecord<R>> implements Transformation<R> {

	int magicNumber = 0;

	@Override
	public void configure(Map<String, ?> props) {
	magicNumber = Integer.parseInt((String) props.get("magic.number"));
	}

	@Override
	public R apply(R record) {
	return record.newRecord(null, magicNumber, null, null, null, null, 0L);
	}

	@Override
	public void close() {
	magicNumber = 0;
	}

	@Override
	public ConfigDef config() {
	return new ConfigDef()
	.define("magic.number", ConfigDef.Type.INT, ConfigDef.NO_DEFAULT_VALUE, ConfigDef.Range.atLeast(42), ConfigDef.Importance.HIGH, "");
	}
	}

	@Test
	public void noTransforms() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	new ConnectorConfig(MOCK_PLUGINS, props);
	}

	@Test
	public void danglingTransformAlias() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "dangler");
	ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
	assertTrue(e.getMessage().contains("Not a Transformation"));
	}

	@Test
	public void emptyConnectorName() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "");
	props.put("connector.class", TestConnector.class.getName());
	ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
	assertTrue(e.getMessage().contains("String may not be empty"));
	}

	@Test
	public void wrongTransformationType() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a");
	props.put("transforms.a.type", "uninstantiable");
	ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
	assertTrue(e.getMessage().contains("Class uninstantiable could not be found"));
	}

	@Test
	public void unconfiguredTransform() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a");
	props.put("transforms.a.type", SimpleTransformation.class.getName());
	ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
	assertTrue(e.getMessage().contains("Missing required configuration \"transforms.a.magic.number\" which"));
	}

	@Test
	public void misconfiguredTransform() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a");
	props.put("transforms.a.type", SimpleTransformation.class.getName());
	props.put("transforms.a.magic.number", "40");
	ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
	assertTrue(e.getMessage().contains("Value must be at least 42"));
	}

	@Test
	public void singleTransform() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a");
	props.put("transforms.a.type", SimpleTransformation.class.getName());
	props.put("transforms.a.magic.number", "42");
	final ConnectorConfig config = new ConnectorConfig(MOCK_PLUGINS, props);
	final List<TransformationStage<SinkRecord>> transformationStages = config.transformationStages();
	assertEquals(1, transformationStages.size());
	final TransformationStage<SinkRecord> stage = transformationStages.get(0);
	assertEquals(SimpleTransformation.class, stage.transformClass());
	assertEquals(42, stage.apply(DUMMY_RECORD).kafkaPartition().intValue());
	}

	@Test
	public void multipleTransformsOneDangling() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a, b");
	props.put("transforms.a.type", SimpleTransformation.class.getName());
	props.put("transforms.a.magic.number", "42");
	assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
	}

	@Test
	public void multipleTransforms() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a, b");
	props.put("transforms.a.type", SimpleTransformation.class.getName());
	props.put("transforms.a.magic.number", "42");
	props.put("transforms.b.type", SimpleTransformation.class.getName());
	props.put("transforms.b.magic.number", "84");
	final ConnectorConfig config = new ConnectorConfig(MOCK_PLUGINS, props);
	final List<TransformationStage<SinkRecord>> transformationStages = config.transformationStages();
	assertEquals(2, transformationStages.size());
	assertEquals(42, transformationStages.get(0).apply(DUMMY_RECORD).kafkaPartition().intValue());
	assertEquals(84, transformationStages.get(1).apply(DUMMY_RECORD).kafkaPartition().intValue());
	}

	@Test
	public void abstractTransform() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a");
	props.put("transforms.a.type", AbstractTransformation.class.getName());
	try {
	new ConnectorConfig(MOCK_PLUGINS, props);
	} catch (ConfigException ex) {
	assertTrue(
	ex.getMessage().contains("Transformation is abstract and cannot be created.")
	);
	}
	}
	@Test
	public void abstractKeyValueTransform() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a");
	props.put("transforms.a.type", AbstractKeyValueTransformation.class.getName());
	try {
	new ConnectorConfig(MOCK_PLUGINS, props);
	} catch (ConfigException ex) {
	assertTrue(
	ex.getMessage().contains("Transformation is abstract and cannot be created.")
	);
	assertTrue(
	ex.getMessage().contains(AbstractKeyValueTransformation.Key.class.getName())
	);
	assertTrue(
	ex.getMessage().contains(AbstractKeyValueTransformation.Value.class.getName())
	);
	}
	}

	@Test
	public void wrongPredicateType() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a");
	props.put("transforms.a.type", SimpleTransformation.class.getName());
	props.put("transforms.a.magic.number", "42");
	props.put("transforms.a.predicate", "my-pred");
	props.put("predicates", "my-pred");
	props.put("predicates.my-pred.type", TestConnector.class.getName());
	ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
	assertTrue(e.getMessage().contains("Not a Predicate"));
	}

	@Test
	public void singleConditionalTransform() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a");
	props.put("transforms.a.type", SimpleTransformation.class.getName());
	props.put("transforms.a.magic.number", "42");
	props.put("transforms.a.predicate", "my-pred");
	props.put("transforms.a.negate", "true");
	props.put("predicates", "my-pred");
	props.put("predicates.my-pred.type", TestPredicate.class.getName());
	props.put("predicates.my-pred.int", "84");
	assertTransformationStageWithPredicate(props, true);
	}

	@Test
	public void predicateNegationDefaultsToFalse() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a");
	props.put("transforms.a.type", SimpleTransformation.class.getName());
	props.put("transforms.a.magic.number", "42");
	props.put("transforms.a.predicate", "my-pred");
	props.put("predicates", "my-pred");
	props.put("predicates.my-pred.type", TestPredicate.class.getName());
	props.put("predicates.my-pred.int", "84");
	assertTransformationStageWithPredicate(props, false);
	}

	@Test
	public void abstractPredicate() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a");
	props.put("transforms.a.type", SimpleTransformation.class.getName());
	props.put("transforms.a.magic.number", "42");
	props.put("transforms.a.predicate", "my-pred");
	props.put("predicates", "my-pred");
	props.put("predicates.my-pred.type", AbstractTestPredicate.class.getName());
	props.put("predicates.my-pred.int", "84");
	ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
	assertTrue(e.getMessage().contains("Predicate is abstract and cannot be created"));
	}

	private void assertTransformationStageWithPredicate(Map<String, String> props, boolean expectedNegated) {
	final ConnectorConfig config = new ConnectorConfig(MOCK_PLUGINS, props);
	final List<TransformationStage<SinkRecord>> transformationStages = config.transformationStages();
	assertEquals(1, transformationStages.size());
	TransformationStage<SinkRecord> stage = transformationStages.get(0);

	assertEquals(expectedNegated ? 42 : 0, stage.apply(DUMMY_RECORD).kafkaPartition().intValue());

	SinkRecord matchingRecord = DUMMY_RECORD.newRecord(null, 84, null, null, null, null, 0L);
	assertEquals(expectedNegated ? 84 : 42, stage.apply(matchingRecord).kafkaPartition().intValue());
	assertEquals(SimpleTransformation.class, stage.transformClass());

	stage.close();
	}

	@Test
	public void misconfiguredPredicate() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a");
	props.put("transforms.a.type", SimpleTransformation.class.getName());
	props.put("transforms.a.magic.number", "42");
	props.put("transforms.a.predicate", "my-pred");
	props.put("transforms.a.negate", "true");
	props.put("predicates", "my-pred");
	props.put("predicates.my-pred.type", TestPredicate.class.getName());
	props.put("predicates.my-pred.int", "79");
	try {
	new ConnectorConfig(MOCK_PLUGINS, props);
	fail();
	} catch (ConfigException e) {
	assertTrue(e.getMessage().contains("Value must be at least 80"));
	}
	}

	@Test
	public void missingPredicateAliasProperty() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a");
	props.put("transforms.a.type", SimpleTransformation.class.getName());
	props.put("transforms.a.magic.number", "42");
	props.put("transforms.a.predicate", "my-pred");
	// technically not needed
	//props.put("predicates", "my-pred");
	props.put("predicates.my-pred.type", TestPredicate.class.getName());
	props.put("predicates.my-pred.int", "84");
	new ConnectorConfig(MOCK_PLUGINS, props);
	}

	@Test
	public void missingPredicateConfig() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a");
	props.put("transforms.a.type", SimpleTransformation.class.getName());
	props.put("transforms.a.magic.number", "42");
	props.put("transforms.a.predicate", "my-pred");
	props.put("predicates", "my-pred");
	//props.put("predicates.my-pred.type", TestPredicate.class.getName());
	//props.put("predicates.my-pred.int", "84");
	ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
	assertTrue(e.getMessage().contains("Not a Predicate"));
	}

	@Test
	public void negatedButNoPredicate() {
	Map<String, String> props = new HashMap<>();
	props.put("name", "test");
	props.put("connector.class", TestConnector.class.getName());
	props.put("transforms", "a");
	props.put("transforms.a.type", SimpleTransformation.class.getName());
	props.put("transforms.a.magic.number", "42");
	props.put("transforms.a.negate", "true");
	ConfigException e = assertThrows(ConfigException.class, () -> new ConnectorConfig(MOCK_PLUGINS, props));
	assertTrue(e.getMessage().contains("there is no config 'transforms.a.predicate' defining a predicate to be negated"));
	}

	public static class TestPredicate<R extends ConnectRecord<R>> implements Predicate<R> {

	int param;

	public TestPredicate() { }

	@Override
	public ConfigDef config() {
	return new ConfigDef().define("int", ConfigDef.Type.INT, 80, ConfigDef.Range.atLeast(80), ConfigDef.Importance.MEDIUM,
	"A test parameter");
	}

	@Override
	public boolean test(R record) {
	return record.kafkaPartition() == param;
	}

	@Override
	public void close() {
	param = 0;
	}

	@Override
	public void configure(Map<String, ?> configs) {
	param = Integer.parseInt((String) configs.get("int"));
	}
	}

	public static abstract class AbstractTestPredicate<R extends ConnectRecord<R>> implements Predicate<R> {

	public AbstractTestPredicate() { }

	}

	public static abstract class AbstractTransformation<R extends ConnectRecord<R>> implements Transformation<R> {

	}

	public static abstract class AbstractKeyValueTransformation<R extends ConnectRecord<R>> implements Transformation<R> {
	@Override
	public R apply(R record) {
	return null;
	}

	@Override
	public ConfigDef config() {
	return new ConfigDef();
	}

	@Override
	public void close() {

	}

	@Override
	public void configure(Map<String, ?> configs) {

	}


	public static class Key<R extends ConnectRecord<R>> extends AbstractKeyValueTransformation<R> {


	}
	public static class Value<R extends ConnectRecord<R>> extends AbstractKeyValueTransformation<R> {

	}
	}

	@Test
	public void testEnrichedConfigDef() {
	String alias = "hdt";
	String prefix = ConnectorConfig.TRANSFORMS_CONFIG + "." + alias + ".";
	Map<String, String> props = new HashMap<>();
	props.put(ConnectorConfig.TRANSFORMS_CONFIG, alias);
	props.put(prefix + "type", HasDuplicateConfigTransformation.class.getName());
	ConfigDef def = ConnectorConfig.enrich(MOCK_PLUGINS, new ConfigDef(), props, false);
	assertEnrichedConfigDef(def, prefix, HasDuplicateConfigTransformation.MUST_EXIST_KEY, ConfigDef.Type.BOOLEAN);
	assertEnrichedConfigDef(def, prefix, TransformationStage.PREDICATE_CONFIG, ConfigDef.Type.STRING);
	assertEnrichedConfigDef(def, prefix, TransformationStage.NEGATE_CONFIG, ConfigDef.Type.BOOLEAN);
	}

	private static void assertEnrichedConfigDef(ConfigDef def, String prefix, String keyName, ConfigDef.Type expectedType) {
	assertNull(def.configKeys().get(keyName));
	ConfigDef.ConfigKey configKey = def.configKeys().get(prefix + keyName);
	assertNotNull(prefix + keyName + "' config must be present", configKey);
	assertEquals(prefix + keyName + "' config should be a " + expectedType, expectedType, configKey.type);
	}

	public static class HasDuplicateConfigTransformation<R extends ConnectRecord<R>> implements Transformation<R> {
	private static final String MUST_EXIST_KEY = "must.exist.key";
	private static final ConfigDef CONFIG_DEF = new ConfigDef()
	// this configDef is duplicate. It should be removed automatically so as to avoid duplicate config error.
	.define(TransformationStage.PREDICATE_CONFIG, ConfigDef.Type.INT, ConfigDef.NO_DEFAULT_VALUE, ConfigDef.Importance.MEDIUM, "fake")
	// this configDef is duplicate. It should be removed automatically so as to avoid duplicate config error.
	.define(TransformationStage.NEGATE_CONFIG, ConfigDef.Type.INT, 123, ConfigDef.Importance.MEDIUM, "fake")
	// this configDef should appear if above duplicate configDef is removed without any error
	.define(MUST_EXIST_KEY, ConfigDef.Type.BOOLEAN, true, ConfigDef.Importance.MEDIUM, "this key must exist");

	@Override
	public R apply(R record) {
	return record;
	}

	@Override
	public ConfigDef config() {
	return CONFIG_DEF;
	}

	@Override
	public void close() {
	}

	@Override
	public void configure(Map<String, ?> configs) {
	}
	}
	}