content: /*
   * 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.camel.component.debezium;
  
  import java.util.concurrent.ExecutorService;
  
  import io.debezium.embedded.Connect;
  import io.debezium.engine.ChangeEvent;
  import io.debezium.engine.DebeziumEngine;
  import org.apache.camel.Exchange;
  import org.apache.camel.Processor;
  import org.apache.camel.component.debezium.configuration.EmbeddedDebeziumConfiguration;
  import org.apache.camel.support.DefaultConsumer;
  import org.apache.kafka.connect.source.SourceRecord;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class DebeziumConsumer extends DefaultConsumer {
  
      private static final Logger LOG = LoggerFactory.getLogger(DebeziumConsumer.class);
  
      private final DebeziumEndpoint endpoint;
      private final EmbeddedDebeziumConfiguration configuration;
  
      private ExecutorService executorService;
      private DebeziumEngine<ChangeEvent<SourceRecord, SourceRecord>> dbzEngine;
  
      public DebeziumConsumer(DebeziumEndpoint endpoint, Processor processor) {
          super(endpoint, processor);
          this.endpoint = endpoint;
          this.configuration = endpoint.getConfiguration();
      }
  
      @Override
      protected void doStart() throws Exception {
          super.doStart();
  
          // start a single threaded pool to monitor events
          executorService = endpoint.createExecutor(this);
  
          // create engine
          dbzEngine = createDbzEngine();
  
          // submit task to the thread pool
          executorService.submit(
                  () -> {
                      try {
                          dbzEngine.run();
                      } catch (Throwable e) {
                          LOG.error("Debezium engine has failed: {}", e.getMessage(), e);
                      }
                  });
      }
  
      @Override
      protected void doStop() throws Exception {
          if (dbzEngine != null) {
              dbzEngine.close();
          }
  
          // shutdown the thread pool gracefully
          getEndpoint().getCamelContext().getExecutorServiceManager().shutdownGraceful(executorService);
  
          // shutdown camel consumer
          super.doStop();
      }
  
      private DebeziumEngine<ChangeEvent<SourceRecord, SourceRecord>> createDbzEngine() {
          return DebeziumEngine.create(Connect.class)
                  .using(configuration.createDebeziumConfiguration().asProperties())
                  .notifying(this::onEventListener)
                  .build();
      }
  
      private void onEventListener(final ChangeEvent<SourceRecord, SourceRecord> event) {
          final Exchange exchange = endpoint.createDbzExchange(this, event.value());
  
          try {
              // send message to next processor in the route
              getProcessor().process(exchange);
          } catch (Exception ex) {
              exchange.setException(ex);
          } finally {
              // log exception if an exception occurred and was not handled
              if (exchange.getException() != null) {
                  getExceptionHandler().handleException("Error processing exchange", exchange,
                          exchange.getException());
              }
              releaseExchange(exchange, false);
          }
      }
  }
  