| package backtype.storm.drpc; |
| |
| import backtype.storm.Config; |
| import backtype.storm.generated.DistributedRPCInvocations; |
| import backtype.storm.task.OutputCollector; |
| import backtype.storm.task.TopologyContext; |
| import backtype.storm.topology.OutputFieldsDeclarer; |
| import backtype.storm.topology.base.BaseRichBolt; |
| import backtype.storm.tuple.Tuple; |
| import backtype.storm.utils.ServiceRegistry; |
| import backtype.storm.utils.Utils; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.log4j.Logger; |
| import org.apache.thrift7.TException; |
| import org.json.simple.JSONValue; |
| |
| |
| public class ReturnResults extends BaseRichBolt { |
| public static final Logger LOG = Logger.getLogger(ReturnResults.class); |
| OutputCollector _collector; |
| boolean local; |
| |
| Map<List, DRPCInvocationsClient> _clients = new HashMap<List, DRPCInvocationsClient>(); |
| |
| @Override |
| public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) { |
| _collector = collector; |
| local = stormConf.get(Config.STORM_CLUSTER_MODE).equals("local"); |
| } |
| |
| @Override |
| public void execute(Tuple input) { |
| String result = (String) input.getValue(0); |
| String returnInfo = (String) input.getValue(1); |
| if(returnInfo!=null) { |
| Map retMap = (Map) JSONValue.parse(returnInfo); |
| final String host = (String) retMap.get("host"); |
| final int port = Utils.getInt(retMap.get("port")); |
| String id = (String) retMap.get("id"); |
| DistributedRPCInvocations.Iface client; |
| if(local) { |
| client = (DistributedRPCInvocations.Iface) ServiceRegistry.getService(host); |
| } else { |
| List server = new ArrayList() {{ |
| add(host); |
| add(port); |
| }}; |
| |
| if(!_clients.containsKey(server)) { |
| _clients.put(server, new DRPCInvocationsClient(host, port)); |
| } |
| client = _clients.get(server); |
| } |
| |
| try { |
| client.result(id, result); |
| _collector.ack(input); |
| } catch(TException e) { |
| LOG.error("Failed to return results to DRPC server", e); |
| _collector.fail(input); |
| } |
| } |
| } |
| |
| @Override |
| public void cleanup() { |
| for(DRPCInvocationsClient c: _clients.values()) { |
| c.close(); |
| } |
| } |
| |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| } |
| } |