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 storm.trident.drpc;
  
  import backtype.storm.Config;
  import backtype.storm.drpc.DRPCInvocationsClient;
  import backtype.storm.generated.DistributedRPCInvocations;
  import backtype.storm.generated.AuthorizationException;
  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.commons.lang.builder.ToStringBuilder;
  import org.apache.thrift.TException;
  import org.apache.thrift.transport.TTransportException;
  import org.json.simple.JSONValue;
  import storm.trident.drpc.ReturnResultsReducer.ReturnResultsState;
  import storm.trident.operation.MultiReducer;
  import storm.trident.operation.TridentCollector;
  import storm.trident.operation.TridentMultiReducerContext;
  import storm.trident.tuple.TridentTuple;
  
  public class ReturnResultsReducer implements MultiReducer<ReturnResultsState> {
      public static class ReturnResultsState {
          List<TridentTuple> results = new ArrayList<TridentTuple>();
          String returnInfo;
  
          @Override
          public String toString() {
              return ToStringBuilder.reflectionToString(this);
          }
      }
  
      boolean local;
      Map conf;
      Map<List, DRPCInvocationsClient> _clients = new HashMap<List, DRPCInvocationsClient>();
  
      @Override
      public void prepare(Map conf, TridentMultiReducerContext context) {
          this.conf = conf;
          local = conf.get(Config.STORM_CLUSTER_MODE).equals("local");
      }
  
      @Override
      public ReturnResultsState init(TridentCollector collector) {
          return new ReturnResultsState();
      }
  
      @Override
      public void execute(ReturnResultsState state, int streamIndex, TridentTuple input, TridentCollector collector) {
          if (streamIndex == 0) {
              state.returnInfo = input.getString(0);
          } else {
              state.results.add(input);
          }
      }
  
      @Override
      public void complete(ReturnResultsState state, TridentCollector collector) {
          // only one of the multireducers will receive the tuples
          if (state.returnInfo != null) {
              String result = JSONValue.toJSONString(state.results);
              Map retMap = (Map) JSONValue.parse(state.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)) {
                      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);
              } catch (AuthorizationException aze) {
                  collector.reportError(aze);
              } catch (TException e) {
                  collector.reportError(e);
              }
          }
      }
  
      @Override
      public void cleanup() {
          for (DRPCInvocationsClient c : _clients.values()) {
              c.close();
          }
      }
  
  }
  