TableMutatorCompletionCounter.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; 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_Lib_TableMutatorCompletionCounter_h
#define Hypertable_Lib_TableMutatorCompletionCounter_h

#include <Common/Time.h>

#include <condition_variable>
#include <mutex>

namespace Hypertable {

  class TableMutatorCompletionCounter {
  public:
    TableMutatorCompletionCounter() { }

    void set(size_t count) {
      std::unique_lock<std::mutex> lock(m_mutex);
      m_outstanding = count;
      m_done = (m_outstanding == 0) ? true : false;
      m_errors = m_retries = false;
    }

    void decrement() {
      std::unique_lock<std::mutex> lock(m_mutex);
      HT_ASSERT(m_outstanding);
      m_outstanding--;

      if (m_outstanding == 0) {
        m_done = true;
        m_cond.notify_all();
      }
    }

    bool wait_for_completion(Timer &timer) {
      std::unique_lock<std::mutex> lock(m_mutex);

      timer.start();

      auto expire_time = std::chrono::system_clock::now() +
        std::chrono::milliseconds(timer.remaining());

      if (!m_cond.wait_until(lock, expire_time,
                             [this](){ return m_outstanding == 0; }))
        HT_THROW(Error::REQUEST_TIMEOUT, "");

      return !(m_retries || m_errors);
    }

    bool wait_for_completion() {
      std::unique_lock<std::mutex> lock(m_mutex);
      m_cond.wait(lock, [this](){ return m_outstanding == 0; });
      return !(m_retries || m_errors);
    }

    void set_retries() { m_retries = true; }

    void set_errors() { m_errors = true; }

    bool has_retries() { return m_retries; }

    bool has_errors() { return m_errors; }

    void clear_errors() { m_errors = false; }

    bool is_complete() { return m_done; }

  private:
    std::mutex m_mutex;
    std::condition_variable m_cond;
    size_t m_outstanding {};
    bool m_retries {};
    bool m_errors {};
    bool m_done {};
  };

}

#endif // Hypertable_Lib_TableMutatorCompletionCounter_h