DispatchHandlerOperation.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; 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_DispatchHandlerOperation_h
#define Hypertable_Master_DispatchHandlerOperation_h

#include "Context.h"

#include <Hypertable/Lib/RangeServer/Client.h>

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

#include <Common/StringExt.h>

#include <condition_variable>
#include <mutex>
#include <set>

namespace Hypertable {

  using namespace Lib;

  class DispatchHandlerOperation : public DispatchHandler {

  public:

    class Result {
    public:
      Result(const String &loc) : location(loc), error(Error::REQUEST_TIMEOUT) { }

      bool operator<(const Result &other) const {
        return location.compare(other.location) < 0;
      }
      String location;  
      int error;        
      String msg;       
    };

    DispatchHandlerOperation(ContextPtr &context);

    void start(StringSet &locations);

    virtual void start(const String &location) = 0;

    virtual void result_callback(const EventPtr &event) { }

    virtual void handle(EventPtr &event);

    bool wait_for_completion();

    void process_events();

    void get_results(std::set<Result> &results);

  protected:

    ContextPtr m_context;

    RangeServer::Client m_rsclient;

  private:

    struct LtEventPtr {
      bool operator()(const EventPtr &e1, const EventPtr &e2) const {
        return e1->addr < e2->addr;
      }
    };

    std::mutex m_mutex;

    std::condition_variable m_cond;

    std::set<EventPtr, LtEventPtr> m_events;

    int m_outstanding {};

    int m_error_count {};

    StringSet m_locations;

    std::set<Result> m_results;
  };

  typedef std::shared_ptr<DispatchHandlerOperation> DispatchHandlerOperationPtr;

}

#endif // Hypertable_Master_DispatchHandlerOperation_h