contrib/src/main/java/org/apache/apex/malhar/contrib/kafka/KafkaSinglePortStringInputOperator.java

/**
 * 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.apex.malhar.contrib.kafka;

import java.nio.ByteBuffer;
import kafka.message.Message;

/**
 * Kafka input adapter operator with a single output port, which consumes String data from the Kafka message bus.
 * <p></p>
 *
 * @displayName Kafka Single Port String Input
 * @category Messaging
 * @tags input operator, string
 *
 * @since 0.3.5
 */
public class KafkaSinglePortStringInputOperator extends AbstractKafkaSinglePortInputOperator<String>
{

  /**
   * Implement abstract method of AbstractActiveMQSinglePortInputOperator
   */
  @Override
  public String getTuple(Message message)
  {
    String data = "";
    try {
      ByteBuffer buffer = message.payload();
      byte[] bytes = new byte[buffer.remaining()];
      buffer.get(bytes);
      data = new String(bytes);
      //logger.debug("Consuming {}", data);
    } catch (Exception ex) {
      return data;
    }
    return data;
  }

}