| package backtype.storm.drpc; |
| |
| import backtype.storm.task.TopologyContext; |
| import backtype.storm.topology.BasicOutputCollector; |
| import backtype.storm.topology.OutputFieldsDeclarer; |
| import backtype.storm.topology.base.BaseBasicBolt; |
| import backtype.storm.tuple.Fields; |
| import backtype.storm.tuple.Tuple; |
| import backtype.storm.tuple.Values; |
| import java.util.Map; |
| import java.util.Random; |
| import backtype.storm.utils.Utils; |
| |
| |
| public class PrepareRequest extends BaseBasicBolt { |
| public static final String ARGS_STREAM = Utils.DEFAULT_STREAM_ID; |
| public static final String RETURN_STREAM = "ret"; |
| public static final String ID_STREAM = "id"; |
| |
| Random rand; |
| |
| @Override |
| public void prepare(Map map, TopologyContext context) { |
| rand = new Random(); |
| } |
| |
| @Override |
| public void execute(Tuple tuple, BasicOutputCollector collector) { |
| String args = tuple.getString(0); |
| String returnInfo = tuple.getString(1); |
| long requestId = rand.nextLong(); |
| collector.emit(ARGS_STREAM, new Values(requestId, args)); |
| collector.emit(RETURN_STREAM, new Values(requestId, returnInfo)); |
| collector.emit(ID_STREAM, new Values(requestId)); |
| } |
| |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declareStream(ARGS_STREAM, new Fields("request", "args")); |
| declarer.declareStream(RETURN_STREAM, new Fields("request", "return")); |
| declarer.declareStream(ID_STREAM, new Fields("request")); |
| } |
| } |