text: /**
   * 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.
   */
  
  #include <list>
  #include <map>
  #include <string>
  #include <vector>
  
  #include "spoutimpl/spout-output-collector-impl.h"
  #include "proto/messages.h"
  #include "network/network.h"
  #include "basics/basics.h"
  
  namespace heron {
  namespace instance {
  
  SpoutOutputCollectorImpl::SpoutOutputCollectorImpl(
                            std::shared_ptr<api::serializer::IPluggableSerializer> serializer,
                            std::shared_ptr<TaskContextImpl> taskContext,
                            NotifyingCommunicator<google::protobuf::Message*>* dataFromExecutor)
    : api::spout::ISpoutOutputCollector(serializer) {
    collector_ = new OutgoingTupleCollection(taskContext->getThisComponentName(), dataFromExecutor);
    ackingEnabled_ = taskContext->isAckingEnabled();
    taskId_ = taskContext->getThisTaskId();
  }
  
  SpoutOutputCollectorImpl::~SpoutOutputCollectorImpl() {
    delete collector_;
  }
  
  void SpoutOutputCollectorImpl::reportError(std::exception& except) {
    LOG(INFO) << "Reporting an error in topology code " << except.what();
  }
  
  void SpoutOutputCollectorImpl::emitInternal(const std::string& streamId,
                                              const std::vector<std::string>& tup,
                                              int64_t msgId) {
    auto msg = new proto::system::HeronDataTuple();
    msg->set_key(0);
    if (msgId >= 0) {
      std::shared_ptr<RootTupleInfo> tupleInfo(new RootTupleInfo(streamId, msgId));
      if (ackingEnabled_) {
        // This message is rooted
        auto root = msg->add_roots();
        root->set_taskid(taskId_);
        int64_t rootId = distribution_(generator_);
        root->set_key(rootId);
        inflightTuples_[rootId] = tupleInfo;
        reverseInflightTuples_[tupleInfo] = rootId;
      } else {
        immediateAcks_.push_back(tupleInfo);
      }
    }
  
    int tupleSize = 0;
    for (auto col : tup) {
      msg->add_values(col);
      tupleSize += col.size();
    }
    collector_->addDataTuple(streamId, msg, tupleSize);
  }
  
  std::shared_ptr<RootTupleInfo> SpoutOutputCollectorImpl::retireInFlight(int64_t key) {
    std::shared_ptr<RootTupleInfo> retval;
    std::map<int64_t, std::shared_ptr<RootTupleInfo>>::iterator iter;
    iter = inflightTuples_.find(key);
    if (iter == inflightTuples_.end()) {
      return retval;
    } else {
      retval = iter->second;
      inflightTuples_.erase(iter);
      reverseInflightTuples_.erase(retval);
      return retval;
    }
  }
  
  void SpoutOutputCollectorImpl::retireExpired(int messageTimeout,
                                               std::list<std::shared_ptr<RootTupleInfo>>& expired) {
    int64_t currentTimeNs =  std::chrono::duration_cast<std::chrono::nanoseconds>(
                                     std::chrono::system_clock::now().time_since_epoch()).count();
    int64_t timeout = messageTimeout * 1000 * 1000 * 1000;
    // Note:- we are going in the reverse order of the reverseInflightTuples
    // This ensures that we are getting the oldest tuples first
    auto it = reverseInflightTuples_.crbegin();
    while (it != reverseInflightTuples_.crend()) {
      if (it->first->isExpired(currentTimeNs, timeout)) {
        expired.push_back(it->first);
        inflightTuples_.erase(it->second);
        reverseInflightTuples_.erase(it->first);
        it = reverseInflightTuples_.crbegin();
      } else {
        break;
      }
    }
  }
  
  }  // namespace instance
  }  // namespace heron
  