text: /*
   * Copyright 2018 NAVER Corp.
   *
   * Licensed 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 com.navercorp.test.pinpoint.plugin.rabbitmq;
  
  import com.rabbitmq.client.Channel;
  import com.rabbitmq.client.GetResponse;
  
  import java.io.IOException;
  
  /**
   * @author HyunGil Jeong
   */
  public class TestMessagePuller {
  
      private final Channel channel;
      private final PropagationMarker propagationMarker = new PropagationMarker();
  
      public TestMessagePuller(Channel channel) {
          if (channel == null) {
              throw new NullPointerException("channel");
          }
          this.channel = channel;
      }
  
      public <T> T pullMessage(MessageConverter<T> messageConverter, String queueName, boolean autoAck) throws IOException {
          GetResponse response = channel.basicGet(queueName, autoAck);
          if (response == null) {
              return null;
          }
          propagationMarker.mark();
          byte[] body = response.getBody();
          T message = messageConverter.convertMessage(body);
          if (!autoAck) {
              channel.basicAck(response.getEnvelope().getDeliveryTag(), false);
          }
          return message;
      }
  
  }
  