| /** |
| * 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 org.apache.storm.drpc; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.storm.Config; |
| import org.apache.storm.generated.AuthorizationException; |
| import org.apache.storm.generated.DistributedRPCInvocations; |
| import org.apache.storm.shade.org.json.simple.JSONValue; |
| import org.apache.storm.shade.org.json.simple.parser.ParseException; |
| import org.apache.storm.task.OutputCollector; |
| import org.apache.storm.task.TopologyContext; |
| import org.apache.storm.thrift.TException; |
| import org.apache.storm.thrift.transport.TTransportException; |
| import org.apache.storm.topology.OutputFieldsDeclarer; |
| import org.apache.storm.topology.base.BaseRichBolt; |
| import org.apache.storm.tuple.Tuple; |
| import org.apache.storm.utils.ObjectReader; |
| import org.apache.storm.utils.ServiceRegistry; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class ReturnResults extends BaseRichBolt { |
| public static final Logger LOG = LoggerFactory.getLogger(ReturnResults.class); |
| //ANY CHANGE TO THIS CODE MUST BE SERIALIZABLE COMPATIBLE OR THERE WILL BE PROBLEMS |
| static final long serialVersionUID = -774882142710631591L; |
| OutputCollector _collector; |
| boolean local; |
| Map<String, Object> _conf; |
| Map<List, DRPCInvocationsClient> _clients = new HashMap<List, DRPCInvocationsClient>(); |
| |
| @Override |
| public void prepare(Map<String, Object> topoConf, TopologyContext context, OutputCollector collector) { |
| _conf = topoConf; |
| _collector = collector; |
| local = topoConf.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<String, Object> retMap; |
| try { |
| retMap = (Map<String, Object>) JSONValue.parseWithException(returnInfo); |
| } catch (ParseException e) { |
| LOG.error("Parseing returnInfo failed", e); |
| _collector.fail(input); |
| return; |
| } |
| final String host = (String) retMap.get("host"); |
| final int port = ObjectReader.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); |
| } |
| |
| |
| int retryCnt = 0; |
| int maxRetries = 3; |
| while (retryCnt < maxRetries) { |
| retryCnt++; |
| try { |
| client.result(id, result); |
| _collector.ack(input); |
| break; |
| } catch (AuthorizationException aze) { |
| LOG.error("Not authorized to return results to DRPC server", aze); |
| _collector.fail(input); |
| throw new RuntimeException(aze); |
| } catch (TException tex) { |
| if (retryCnt >= maxRetries) { |
| LOG.error("Failed to return results to DRPC server", tex); |
| _collector.fail(input); |
| } |
| reconnectClient((DRPCInvocationsClient) client); |
| } |
| } |
| } |
| } |
| |
| private void reconnectClient(DRPCInvocationsClient client) { |
| if (client instanceof DRPCInvocationsClient) { |
| try { |
| LOG.info("reconnecting... "); |
| client.reconnectClient(); //Blocking call |
| } catch (TException e2) { |
| LOG.error("Failed to connect to DRPC server", e2); |
| } |
| } |
| } |
| |
| @Override |
| public void cleanup() { |
| for (DRPCInvocationsClient c : _clients.values()) { |
| c.close(); |
| } |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| } |
| } |