ResponseManager.h

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/* -*- c++ -*-
 * Copyright (C) 2007-2015 Hypertable, Inc.
 *
 * This file is part of Hypertable.
 *
 * Hypertable is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or any later version.
 *
 * Hypertable is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#ifndef Hypertable_Master_ResponseManager_h
#define Hypertable_Master_ResponseManager_h

#include "Context.h"
#include "Operation.h"

#include <Hypertable/Lib/MetaLogWriter.h>

#include <AsyncComm/Clock.h>
#include <AsyncComm/Comm.h>

#include <Common/Thread.h>

#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/properties.hpp>
#include <boost/multi_index/hashed_index.hpp>
#include <boost/multi_index/member.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <boost/multi_index_container.hpp>
#include <boost/thread/condition.hpp>

#include <chrono>
#include <condition_variable>
#include <list>
#include <map>
#include <memory>
#include <mutex>
#include <thread>

namespace Hypertable {

  using namespace boost::multi_index;

  class ResponseManagerContext {
  public:

    ResponseManagerContext() {
      comm = Comm::instance();
    }

    class OperationRec {
    public:

      OperationRec(OperationPtr &_op) : op(_op) { }

      ClockT::time_point expiration_time() const { return op->expiration_time(); }

      int64_t id() const { return op->id(); }

      OperationPtr op;
    };

    typedef boost::multi_index_container<
      OperationRec,
      indexed_by<
      sequenced<>,
      ordered_non_unique<const_mem_fun<OperationRec, ClockT::time_point,
                                       &OperationRec::expiration_time> >,
      hashed_unique<const_mem_fun<OperationRec, int64_t,
                                  &OperationRec::id> >
    >
    > OperationList;

    typedef OperationList::nth_index<0>::type OperationSequence;
    typedef OperationList::nth_index<1>::type OperationExpirationTimeIndex;
    typedef OperationList::nth_index<2>::type OperationIdentifierIndex;

    class DeliveryRec {
    public:
      ClockT::time_point expiration_time;
      int64_t id;
      EventPtr event;
    };

    typedef boost::multi_index_container<
      DeliveryRec,
      indexed_by<
      sequenced<>,
      ordered_non_unique<member<DeliveryRec, ClockT::time_point,
                                &DeliveryRec::expiration_time> >,
      hashed_unique<member<DeliveryRec, int64_t,
                           &DeliveryRec::id> > 
    >
    > DeliveryList;

    typedef DeliveryList::nth_index<0>::type DeliverySequence;
    typedef DeliveryList::nth_index<1>::type DeliveryExpirationTimeIndex;
    typedef DeliveryList::nth_index<2>::type DeliveryIdentifierIndex;

    std::mutex mutex;

    std::condition_variable cond;

    Comm *comm {};

    MetaLog::WriterPtr mml_writer;

    bool shutdown {};

    OperationList expirable_ops;

    DeliveryList delivery_list;

    std::list<OperationPtr> removal_queue;
  };

  class ResponseManager {
  public:

    ResponseManager() : m_context(std::make_shared<ResponseManagerContext>()) { }

    void operator()();

    void add_operation(OperationPtr &operation);

    void add_delivery_info(int64_t operation_id, EventPtr &event);

    void set_mml_writer(MetaLog::WriterPtr &mml_writer) {
      std::lock_guard<std::mutex> lock(m_context->mutex);
      m_context->mml_writer = mml_writer;
    }

    void shutdown();

  private:
    std::shared_ptr<ResponseManagerContext> m_context;

  };

}

#endif // Hypertable_Master_ResponseManager_h