content: /**
   * 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 backtype.storm.drpc;
  
  import backtype.storm.Config;
  import backtype.storm.generated.DistributedRPCInvocations;
  import backtype.storm.generated.AuthorizationException;
  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.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.apache.thrift.TException;
  import org.apache.thrift.transport.TTransportException;
  import org.json.simple.JSONValue;
  
  public class ReturnResults extends BaseRichBolt {
      // ANY CHANGE TO THIS CODE MUST BE SERIALIZABLE COMPATIBLE OR THERE WILL BE PROBLEMS
      static final long serialVersionUID = -774882142710631591L;
  
      public static final Logger LOG = LoggerFactory.getLogger(ReturnResults.class);
      OutputCollector _collector;
      boolean local;
      Map _conf;
      Map<List, DRPCInvocationsClient> _clients = new HashMap<>();
  
      @Override
      public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {
          _conf = stormConf;
          _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);
          // LOG.info("Receive one message, resultInfo:{}, result:{}", returnInfo, result);
          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 hostPort = host + ":" + 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)) {
                      try {
                          _clients.put(server, new DRPCInvocationsClient(_conf, host, port));
                      } catch (TTransportException ex) {
                          throw new RuntimeException(ex);
                      }
                  }
                  client = _clients.get(server);
              }
  
              try {
                  client.result(id, result);
                  _collector.ack(input);
              } catch (AuthorizationException aze) {
                  LOG.error("Not authorized to return results to DRPC server " + hostPort, aze);
                  _collector.fail(input);
                  if (client instanceof DRPCInvocationsClient) {
                      try {
                          LOG.info("reconnecting... ");
                          ((DRPCInvocationsClient) client).reconnectClient(); // Blocking call
                      } catch (TException e2) {
                          throw new RuntimeException(e2);
                      }
                  }
              } catch (TException e) {
                  LOG.error("Failed to return results to DRPC server " + hostPort, e);
                  _collector.fail(input);
                  if (client instanceof DRPCInvocationsClient) {
                      try {
                          LOG.info("reconnecting... ");
                          ((DRPCInvocationsClient) client).reconnectClient(); // Blocking call
                      } catch (TException e2) {
                          throw new RuntimeException(e2);
                      }
                  }
              }
          }
      }
  
      @Override
      public void cleanup() {
          for (DRPCInvocationsClient c : _clients.values()) {
              c.close();
          }
      }
  
      public void declareOutputFields(OutputFieldsDeclarer declarer) {
      }
  }
  