[FLINK-34466] Lineage interfaces for kafka connector

flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/lineage/DefaultKafkaDatasetFacet.java

@@ -0,0 +1,63 @@
+package org.apache.flink.connector.kafka.lineage;
+
+import org.apache.flink.connector.kafka.source.KafkaPropertiesUtil;
+
+import java.util.Objects;
+import java.util.Properties;
+
+/** Default implementation of {@link KafkaDatasetFacet}. */
+public class DefaultKafkaDatasetFacet implements KafkaDatasetFacet {
+
+    public static final String KAFKA_FACET_NAME = "kafka";
+
+    private Properties properties;
+
+    private final KafkaDatasetIdentifier topicIdentifier;
+
+    public DefaultKafkaDatasetFacet(KafkaDatasetIdentifier topicIdentifier, Properties properties) {
+        this(topicIdentifier);
+
+        this.properties = new Properties();
+        KafkaPropertiesUtil.copyProperties(properties, this.properties);
+    }
+
+    public DefaultKafkaDatasetFacet(KafkaDatasetIdentifier topicIdentifier) {
+        this.topicIdentifier = topicIdentifier;
+    }
+
+    public void setProperties(Properties properties) {
+        this.properties = new Properties();
+        KafkaPropertiesUtil.copyProperties(properties, this.properties);
+    }
+
+    public Properties getProperties() {
+        return properties;
+    }
+
+    public KafkaDatasetIdentifier getTopicIdentifier() {
+        return topicIdentifier;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DefaultKafkaDatasetFacet that = (DefaultKafkaDatasetFacet) o;
+        return Objects.equals(properties, that.properties)
+                && Objects.equals(topicIdentifier, that.topicIdentifier);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(properties, topicIdentifier);
+    }
+
+    @Override
+    public String name() {
+        return KAFKA_FACET_NAME;
+    }
+}

flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/lineage/DefaultKafkaDatasetIdentifier.java

@@ -0,0 +1,56 @@
+package org.apache.flink.connector.kafka.lineage;
+
+import javax.annotation.Nullable;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+import java.util.regex.Pattern;
+
+/** Default implementation of {@link KafkaDatasetIdentifier}. */
+public class DefaultKafkaDatasetIdentifier implements KafkaDatasetIdentifier {
+
+    @Nullable private final List<String> topics;
+    @Nullable private final Pattern topicPattern;
+
+    public DefaultKafkaDatasetIdentifier(List<String> fixedTopics, Pattern topicPattern) {
+        this.topics = fixedTopics;
+        this.topicPattern = topicPattern;
+    }
+
+    public static DefaultKafkaDatasetIdentifier ofPattern(Pattern pattern) {
+        return new DefaultKafkaDatasetIdentifier(Collections.emptyList(), pattern);
+    }
+
+    public static DefaultKafkaDatasetIdentifier ofTopics(List<String> fixedTopics) {
+        return new DefaultKafkaDatasetIdentifier(fixedTopics, null);
+    }
+
+    @Nullable
+    public List<String> getTopics() {
+        return topics;
+    }
+
+    @Nullable
+    public Pattern getTopicPattern() {
+        return topicPattern;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DefaultKafkaDatasetIdentifier that = (DefaultKafkaDatasetIdentifier) o;
+        return Objects.equals(topics, that.topics)
+                && Objects.equals(topicPattern, that.topicPattern);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(topics, topicPattern);
+    }
+}

flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/lineage/DefaultTypeDatasetFacet.java

@@ -0,0 +1,42 @@
+package org.apache.flink.connector.kafka.lineage;
+
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+
+import java.util.Objects;
+
+/** Default implementation of {@link KafkaDatasetFacet}. */
+public class DefaultTypeDatasetFacet implements TypeDatasetFacet {
+
+    public static final String TYPE_FACET_NAME = "type";
+
+    private final TypeInformation typeInformation;
+
+    public DefaultTypeDatasetFacet(TypeInformation typeInformation) {
+        this.typeInformation = typeInformation;
+    }
+
+    public TypeInformation getTypeInformation() {
+        return typeInformation;
+    }
+
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DefaultTypeDatasetFacet that = (DefaultTypeDatasetFacet) o;
+        return Objects.equals(typeInformation, that.typeInformation);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(typeInformation);
+    }
+
+    @Override
+    public String name() {
+        return TYPE_FACET_NAME;
+    }
+}

flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/lineage/KafkaDatasetFacet.java

@@ -0,0 +1,14 @@
+package org.apache.flink.connector.kafka.lineage;
+
+import org.apache.flink.streaming.api.lineage.LineageDatasetFacet;
+
+import java.util.Properties;
+
+/** Facet definition to contain all Kafka specific information on Kafka sources and sinks. */
+public interface KafkaDatasetFacet extends LineageDatasetFacet {
+    Properties getProperties();
+
+    KafkaDatasetIdentifier getTopicIdentifier();
+
+    void setProperties(Properties properties);
+}

flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/lineage/KafkaDatasetFacetProvider.java

@@ -0,0 +1,15 @@
+package org.apache.flink.connector.kafka.lineage;
+
+import java.util.Optional;
+
+/** Contains method to extract {@link KafkaDatasetFacet}. */
+public interface KafkaDatasetFacetProvider {
+
+    /**
+     * Returns a Kafka dataset facet or `Optional.empty` in case an implementing class is not able
+     * to identify a dataset.
+     *
+     * @return
+     */
+    Optional<KafkaDatasetFacet> getKafkaDatasetFacet();
+}

flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/lineage/KafkaDatasetIdentifier.java

@@ -0,0 +1,28 @@
+package org.apache.flink.connector.kafka.lineage;
+
+import javax.annotation.Nullable;
+
+import java.util.List;
+import java.util.regex.Pattern;
+
+/** Kafka dataset identifier which can contain either a list of topics or a topic pattern. */
+public interface KafkaDatasetIdentifier {
+    @Nullable
+    List<String> getTopics();
+
+    @Nullable
+    Pattern getTopicPattern();
+
+    /**
+     * Assigns lineage dataset's name which is topic pattern if it is present or comma separated
+     * list of topics.
+     *
+     * @return
+     */
+    default String toLineageName() {
+        if (getTopicPattern() != null) {
+            return getTopicPattern().toString();
+        }
+        return String.join(",", getTopics());
+    }
+}

flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/lineage/KafkaDatasetIdentifierProvider.java

@@ -0,0 +1,15 @@
+package org.apache.flink.connector.kafka.lineage;
+
+import java.util.Optional;
+
+/** Contains method which allows extracting topic identifier. */
+public interface KafkaDatasetIdentifierProvider {
+
+    /**
+     * Gets Kafka dataset identifier or empty in case a class implementing is not able to extract
+     * dataset identifier.
+     *
+     * @return
+     */
+    Optional<DefaultKafkaDatasetIdentifier> getDatasetIdentifier();
+}

flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/lineage/LineageUtil.java

@@ -0,0 +1,118 @@
+/*
+ * 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.flink.connector.kafka.lineage;
+
+import org.apache.flink.api.connector.source.Boundedness;
+import org.apache.flink.streaming.api.lineage.LineageDataset;
+import org.apache.flink.streaming.api.lineage.LineageDatasetFacet;
+import org.apache.flink.streaming.api.lineage.LineageVertex;
+import org.apache.flink.streaming.api.lineage.SourceLineageVertex;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.stream.Collectors;
+
+/** Utility class with useful methods for managing lineage objects. */
+public class LineageUtil {
+
+    private static final String KAFKA_DATASET_PREFIX = "kafka://";
+    private static final String COMMA = ",";
+    private static final String SEMICOLON = ";";
+
+    public static LineageDataset datasetOf(String namespace, KafkaDatasetFacet kafkaDatasetFacet) {
+        return datasetOf(namespace, kafkaDatasetFacet, Collections.emptyList());
+    }
+
+    public static LineageDataset datasetOf(
+            String namespace, KafkaDatasetFacet kafkaDatasetFacet, TypeDatasetFacet typeFacet) {
+        return datasetOf(namespace, kafkaDatasetFacet, Collections.singletonList(typeFacet));
+    }
+
+    private static LineageDataset datasetOf(
+            String namespace,
+            KafkaDatasetFacet kafkaDatasetFacet,
+            List<LineageDatasetFacet> facets) {
+        return new LineageDataset() {
+            @Override
+            public String name() {
+                return kafkaDatasetFacet.getTopicIdentifier().toLineageName();
+            }
+
+            @Override
+            public String namespace() {
+                return namespace;
+            }
+
+            @Override
+            public Map<String, LineageDatasetFacet> facets() {
+                Map facetMap = new HashMap<String, LineageDatasetFacet>();
+                facetMap.put(DefaultKafkaDatasetFacet.KAFKA_FACET_NAME, kafkaDatasetFacet);
+                facetMap.putAll(
+                        facets.stream()
+                                .collect(
+                                        Collectors.toMap(LineageDatasetFacet::name, item -> item)));
+                return facetMap;
+            }
+        };
+    }
+
+    public static String namespaceOf(Properties properties) {
+        String bootstrapServers = properties.getProperty("bootstrap.servers");
+
+        if (bootstrapServers == null) {
+            return KAFKA_DATASET_PREFIX;
+        }
+
+        if (bootstrapServers.contains(COMMA)) {
+            bootstrapServers = bootstrapServers.split(COMMA)[0];
+        } else if (bootstrapServers.contains(SEMICOLON)) {
+            bootstrapServers = bootstrapServers.split(SEMICOLON)[0];
+        }
+
+        return String.format(KAFKA_DATASET_PREFIX + bootstrapServers);
+    }
+
+    public static SourceLineageVertex sourceLineageVertexOf(Collection<LineageDataset> datasets) {
+        return new SourceLineageVertex() {
+            @Override
+            public Boundedness boundedness() {
+                return Boundedness.CONTINUOUS_UNBOUNDED;
+            }
+
+            @Override
+            public List<LineageDataset> datasets() {
+                return datasets.stream().collect(Collectors.toList());
+            }
+        };
+    }
+
+    public static LineageVertex lineageVertexOf(Collection<LineageDataset> datasets) {
+        return new LineageVertex() {
+            @Override
+            public List<LineageDataset> datasets() {
+                return datasets.stream().collect(Collectors.toList());
+            }
+        };
+    }
+}

flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/lineage/TypeDatasetFacet.java

@@ -0,0 +1,9 @@
+package org.apache.flink.connector.kafka.lineage;
+
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.streaming.api.lineage.LineageDatasetFacet;
+
+/** Facet definition to contain type information of source and sink. */
+public interface TypeDatasetFacet extends LineageDatasetFacet {
+    TypeInformation getTypeInformation();
+}

flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/lineage/TypeDatasetFacetProvider.java

@@ -0,0 +1,15 @@
+package org.apache.flink.connector.kafka.lineage;
+
+import java.util.Optional;
+
+/** Contains method to extract {@link TypeDatasetFacet}. */
+public interface TypeDatasetFacetProvider {
+
+    /**
+     * Returns a type dataset facet or `Optional.empty` in case an implementing class is not able to
+     * resolve type.
+     *
+     * @return
+     */
+    Optional<TypeDatasetFacet> getTypeDatasetFacet();
+}