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    • com.microsoft.eventhubs.spout.EventDataScheme Maven / Gradle / Ivy

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    /*******************************************************************************
 * 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 com.microsoft.eventhubs.spout;

import backtype.storm.tuple.Fields;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.qpid.amqp_1_0.client.Message;
import org.apache.qpid.amqp_1_0.type.Section;
import org.apache.qpid.amqp_1_0.type.messaging.AmqpValue;
import org.apache.qpid.amqp_1_0.type.messaging.ApplicationProperties;
import org.apache.qpid.amqp_1_0.type.messaging.Data;

/**
 * This implementation converts the Message payload into Strings and passes them on.
 *
 * This makes the assumption that the payload is String data and not some other type of binary format (ie. compressed data for example).
 *
 * If you want to pass the raw bytes to your Bolts, use the {@link BinaryEventDataScheme} class.
 */
public class EventDataScheme implements IEventDataScheme {

  private static final long serialVersionUID = 1L;

  @Override
  public List deserialize(Message message) {
    final List fieldContents = new ArrayList();

    /**
     * Default values.
     */
    Map metaDataMap = new HashMap();
    String messageData = "";

    for (Section section : message.getPayload()) {
      if (section instanceof Data) {
        Data data = (Data) section;
        messageData = new String(data.getValue().getArray());
      } else if (section instanceof AmqpValue) {
        AmqpValue amqpValue = (AmqpValue) section;
        messageData = amqpValue.getValue().toString();
      } else if(section instanceof ApplicationProperties) {
        final ApplicationProperties applicationProperties = (ApplicationProperties) section;
        metaDataMap = applicationProperties.getValue();
      }
    }

    fieldContents.add(messageData);
    fieldContents.add(metaDataMap);
    return fieldContents;
  }

  @Override
  public Fields getOutputFields() {
    return new Fields(FieldConstants.Message, FieldConstants.META_DATA);
  }
}
    
    
    
    

    




    
    
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