code: /*
   * 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.skywalking.oap.server.analyzer.agent.kafka.provider.handler;
  
  import org.apache.kafka.clients.consumer.ConsumerRecord;
  import org.apache.kafka.common.utils.Bytes;
  import org.apache.skywalking.oap.server.analyzer.agent.kafka.mock.MockModuleManager;
  import org.apache.skywalking.oap.server.analyzer.agent.kafka.module.KafkaFetcherConfig;
  import org.apache.skywalking.oap.server.library.module.ModuleManager;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public class AbstractKafkaHandlerTest {
      @Test
      public void testGetTopic() {
          KafkaFetcherConfig config = new KafkaFetcherConfig();
  
          MockModuleManager manager = new MockModuleManager() {
              @Override
              protected void init() {
              }
          };
          String plainTopic = config.getTopicNameOfTracingSegments();
  
          MockKafkaHandler kafkaHandler = new MockKafkaHandler(plainTopic, manager, config);
  
          //  unset namespace and mm2
          assertEquals(kafkaHandler.getTopic(), plainTopic);
  
          //set namespace only
          String namespace = "product";
          config.setNamespace(namespace);
          assertEquals(namespace + "-" + plainTopic, kafkaHandler.getTopic());
  
          //set mm2 only
          config.setNamespace("");
          String mm2SourceAlias = "DC1";
          config.setMm2SourceAlias(mm2SourceAlias);
          String mm2SourceSeparator = ".";
          config.setMm2SourceSeparator(mm2SourceSeparator);
          assertEquals(mm2SourceAlias + mm2SourceSeparator + plainTopic, kafkaHandler.getTopic());
  
          //set namespace and mm2
          config.setNamespace(namespace);
          config.setMm2SourceAlias(mm2SourceAlias);
          config.setMm2SourceSeparator(mm2SourceSeparator);
          assertEquals(mm2SourceAlias + mm2SourceSeparator + namespace + "-" + plainTopic, kafkaHandler.getTopic());
  
      }
  
      static class MockKafkaHandler extends AbstractKafkaHandler {
          private String plainTopic;
  
          public MockKafkaHandler(String plainTopic, ModuleManager manager, KafkaFetcherConfig config) {
              super(manager, config);
              this.plainTopic = plainTopic;
          }
  
          @Override
          protected String getPlainTopic() {
              return plainTopic;
          }
  
          @Override
          public void handle(ConsumerRecord<String, Bytes> record) {
  
          }
      }
  }
  