| /* |
| * 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.dynamic.metadata; |
| |
| import org.apache.flink.annotation.Experimental; |
| import org.apache.flink.connector.kafka.source.KafkaPropertiesUtil; |
| import org.apache.flink.connector.kafka.source.KafkaSourceOptions; |
| |
| import org.apache.kafka.clients.CommonClientConfigs; |
| import org.apache.kafka.clients.admin.AdminClient; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Map; |
| import java.util.Properties; |
| import java.util.Set; |
| import java.util.concurrent.ExecutionException; |
| import java.util.stream.Collectors; |
| |
| /** |
| * A {@link KafkaMetadataService} that delegates metadata fetching to a single {@link AdminClient}, |
| * which is scoped to a single cluster. The stream ids are equivalent to topics. |
| */ |
| @Experimental |
| public class SingleClusterTopicMetadataService implements KafkaMetadataService { |
| |
| private final String kafkaClusterId; |
| private final Properties properties; |
| private transient AdminClient adminClient; |
| |
| /** |
| * Create a {@link SingleClusterTopicMetadataService}. |
| * |
| * @param kafkaClusterId the id of the Kafka cluster. |
| * @param properties the properties of the Kafka cluster. |
| */ |
| public SingleClusterTopicMetadataService(String kafkaClusterId, Properties properties) { |
| this.kafkaClusterId = kafkaClusterId; |
| this.properties = properties; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public Set<KafkaStream> getAllStreams() { |
| try { |
| return getAdminClient().listTopics().names().get().stream() |
| .map(this::createKafkaStream) |
| .collect(Collectors.toSet()); |
| } catch (InterruptedException | ExecutionException e) { |
| throw new RuntimeException("Fetching all streams failed", e); |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public Map<String, KafkaStream> describeStreams(Collection<String> streamIds) { |
| try { |
| return getAdminClient().describeTopics(new ArrayList<>(streamIds)).all().get().keySet() |
| .stream() |
| .collect(Collectors.toMap(topic -> topic, this::createKafkaStream)); |
| } catch (InterruptedException | ExecutionException e) { |
| throw new RuntimeException("Fetching all streams failed", e); |
| } |
| } |
| |
| private KafkaStream createKafkaStream(String topic) { |
| ClusterMetadata clusterMetadata = |
| new ClusterMetadata(Collections.singleton(topic), properties); |
| |
| return new KafkaStream(topic, Collections.singletonMap(kafkaClusterId, clusterMetadata)); |
| } |
| |
| private AdminClient getAdminClient() { |
| if (adminClient == null) { |
| Properties adminClientProps = new Properties(); |
| KafkaPropertiesUtil.copyProperties(properties, adminClientProps); |
| String clientIdPrefix = |
| adminClientProps.getProperty(KafkaSourceOptions.CLIENT_ID_PREFIX.key()); |
| adminClientProps.setProperty( |
| CommonClientConfigs.CLIENT_ID_CONFIG, |
| clientIdPrefix + "-single-cluster-topic-metadata-service"); |
| adminClient = AdminClient.create(adminClientProps); |
| } |
| |
| return adminClient; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean isClusterActive(String kafkaClusterId) { |
| return this.kafkaClusterId.equals(kafkaClusterId); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void close() { |
| if (adminClient != null) { |
| adminClient.close(); |
| } |
| } |
| } |