ApplicationHandler.h

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/*
 * 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 AsyncComm_ApplicationHandler_h
#define AsyncComm_ApplicationHandler_h

#include "Clock.h"
#include "Event.h"
#include "ReactorRunner.h"

namespace Hypertable {

  class ApplicationHandler {

  public:
    ApplicationHandler(EventPtr &event) : m_event(event) {
      if (m_event)
        m_urgent = (bool)(m_event->header.flags & CommHeader::FLAGS_BIT_URGENT);
      else
        m_urgent = false;
    }

    ApplicationHandler(bool urgent=false) : m_urgent(urgent) { }

    virtual ~ApplicationHandler() { }

    virtual void run() = 0;

    uint64_t get_group_id() {
      return (m_event) ?  m_event->group_id : 0;
    }

    bool is_urgent() { return m_urgent; }

    bool is_expired() {
      if (m_event && m_event->type == Event::MESSAGE &&
          ReactorRunner::record_arrival_time &&
          (m_event->header.flags & CommHeader::FLAGS_BIT_REQUEST)) {
        auto now = ClockT::now();
        uint32_t wait_ms = (uint32_t)std::chrono::duration_cast<std::chrono::milliseconds>(now - m_event->arrival_time).count();
        if (wait_ms >= m_event->header.timeout_ms) {
          if (m_event->header.flags & CommHeader::FLAGS_BIT_REQUEST)
            HT_WARNF("Request expired, wait time %u > timeout %u",
                     (unsigned)wait_ms, m_event->header.timeout_ms);
          else
            HT_WARNF("Response expired, wait time %u > timeout %u", (unsigned)wait_ms,
                 m_event->header.timeout_ms);

          if (m_event->header.timeout_ms == 0) {
            HT_INFO("Changing zero timeout request to 120000 ms");
            m_event->header.timeout_ms = 120000;
            return false;
          }

          return true;
        }
      }
      return false;
    }

  protected:
    EventPtr m_event; 
    bool m_urgent;    
  };
} // namespace Hypertable

#endif // AsyncComm_ApplicationHandler_h