RequestCache.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 AsyncComm_RequestCache_h
#define AsyncComm_RequestCache_h

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

#include <unordered_map>

namespace Hypertable {

  class IOHandler;

  class RequestCache {

    class CacheNode {
    public:
      CacheNode(uint32_t id, IOHandler *handler, DispatchHandler *dh)
        : id(id), handler(handler), dh(dh) {}
      CacheNode  *prev, *next;    
      ClockT::time_point expire;  
      uint32_t           id;      
      IOHandler         *handler; 
      DispatchHandler *dh;
    };

    typedef std::unordered_map<uint32_t, CacheNode *> IdHandlerMap;

  public:

    RequestCache() { }

    void insert(uint32_t id, IOHandler *handler, DispatchHandler *dh,
                ClockT::time_point &expire);

    bool remove(uint32_t id, DispatchHandler *&handler);

    bool get_next_timeout(ClockT::time_point &now, IOHandler *&handlerp,
                          DispatchHandler *&dh,
                          ClockT::time_point *next_timeout);

    void purge_requests(IOHandler *handler, int32_t error);

  private:
    IdHandlerMap m_id_map; 
    CacheNode *m_head {};  
    CacheNode *m_tail {};  
  };
}

#endif // AsyncComm_RequestCache_h