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.google.pubsub.consumer;
  
  import com.google.cloud.pubsub.v1.AckReplyConsumer;
  import com.google.cloud.pubsub.v1.MessageReceiver;
  import com.google.common.base.Strings;
  import com.google.pubsub.v1.PubsubMessage;
  import org.apache.camel.Exchange;
  import org.apache.camel.Processor;
  import org.apache.camel.component.google.pubsub.GooglePubsubConstants;
  import org.apache.camel.component.google.pubsub.GooglePubsubConsumer;
  import org.apache.camel.component.google.pubsub.GooglePubsubEndpoint;
  import org.apache.camel.component.google.pubsub.GooglePubsubHeaderFilterStrategy;
  import org.apache.camel.spi.HeaderFilterStrategy;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class CamelMessageReceiver implements MessageReceiver {
  
      private final Logger localLog;
      private final GooglePubsubConsumer consumer;
      private final GooglePubsubEndpoint endpoint;
      private final Processor processor;
      private final HeaderFilterStrategy headerFilterStrategy;
  
      public CamelMessageReceiver(GooglePubsubConsumer consumer, GooglePubsubEndpoint endpoint, Processor processor) {
          this.consumer = consumer;
          this.endpoint = endpoint;
          this.processor = processor;
          String loggerId = endpoint.getLoggerId();
          if (Strings.isNullOrEmpty(loggerId)) {
              loggerId = this.getClass().getName();
          }
          localLog = LoggerFactory.getLogger(loggerId);
          headerFilterStrategy = new GooglePubsubHeaderFilterStrategy(endpoint.isIncludeAllGoogleProperties());
      }
  
      @Override
      public void receiveMessage(PubsubMessage pubsubMessage, AckReplyConsumer ackReplyConsumer) {
          if (localLog.isTraceEnabled()) {
              localLog.trace("Received message ID : {}", pubsubMessage.getMessageId());
          }
  
          Exchange exchange = consumer.createExchange(true);
          exchange.getIn().setBody(pubsubMessage.getData().toByteArray());
  
          // Standard headers
          exchange.getIn().setHeader(GooglePubsubConstants.MESSAGE_ID, pubsubMessage.getMessageId());
          exchange.getIn().setHeader(GooglePubsubConstants.PUBLISH_TIME, pubsubMessage.getPublishTime());
          // Deprecated: replaced by headerFilterStrategy
          exchange.getIn().setHeader(GooglePubsubConstants.ATTRIBUTES, pubsubMessage.getAttributesMap());
  
          GooglePubsubAcknowledge acknowledge = new AcknowledgeAsync(ackReplyConsumer);
          if (endpoint.getAckMode() != GooglePubsubConstants.AckMode.NONE) {
              exchange.getExchangeExtension().addOnCompletion(new AcknowledgeCompletion(acknowledge));
          } else {
              exchange.getIn().setHeader(GooglePubsubConstants.GOOGLE_PUBSUB_ACKNOWLEDGE, acknowledge);
          }
  
          // Inherit the rest of headers
          for (String pubSubHeader : pubsubMessage.getAttributesMap().keySet()) {
              String value = pubsubMessage.getAttributesMap().get(pubSubHeader);
              if (headerFilterStrategy != null
                      && headerFilterStrategy.applyFilterToExternalHeaders(pubSubHeader, value, exchange)) {
                  continue;
              }
              exchange.getIn().setHeader(pubSubHeader, value);
          }
  
          try {
              processor.process(exchange);
          } catch (Exception e) {
              exchange.setException(e);
          }
          if (exchange.getException() != null) {
              consumer.getExceptionHandler().handleException(exchange.getException());
          }
      }
  
  }
  