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Azure EventHubs Spout for Apache Storm

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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 * http://www.apache.org/licenses/LICENSE-2.0
 *
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package com.microsoft.eventhubs.samples;

import backtype.storm.generated.StormTopology;
import backtype.storm.topology.TopologyBuilder;

import com.microsoft.eventhubs.bolt.EventHubBolt;
import com.microsoft.eventhubs.bolt.EventHubBoltConfig;
import com.microsoft.eventhubs.spout.EventHubSpout;

/**
 * A sample topology that loops message back to EventHub
 */
public class EventHubLoop extends EventCount {

  @Override
  protected StormTopology buildTopology(EventHubSpout eventHubSpout) {
    TopologyBuilder topologyBuilder = new TopologyBuilder();

    topologyBuilder.setSpout("EventHubsSpout", eventHubSpout, spoutConfig.getPartitionCount())
      .setNumTasks(spoutConfig.getPartitionCount());
    EventHubBoltConfig boltConfig = new EventHubBoltConfig(spoutConfig.getConnectionString(),
        spoutConfig.getEntityPath(), true);
    
    EventHubBolt eventHubBolt = new EventHubBolt(boltConfig);
    int boltTasks = spoutConfig.getPartitionCount();
    topologyBuilder.setBolt("EventHubsBolt", eventHubBolt, boltTasks)
      .localOrShuffleGrouping("EventHubsSpout").setNumTasks(boltTasks);
    return topologyBuilder.createTopology();
  }
  
  public static void main(String[] args) throws Exception {
    EventHubLoop scenario = new EventHubLoop();
    scenario.runScenario(args);
  }
}