RangeServerHyperspaceCallback.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_Master_RangeServerHyperspaceCallback_h
#define Hypertable_Master_RangeServerHyperspaceCallback_h

#include "Context.h"
#include "OperationProcessor.h"
#include "OperationRecover.h"
#include "OperationTimedBarrier.h"
#include "OperationRegisterServerBlocker.h"
#include "RangeServerConnection.h"

#include "Hyperspace/Session.h"

#include <chrono>
#include <condition_variable>
#include <mutex>

namespace Hypertable {

  class RangeServerHyperspaceCallback : public Hyperspace::HandleCallback {
  public:

    RangeServerHyperspaceCallback(ContextPtr &context, RangeServerConnectionPtr &rsc)
      : Hyperspace::HandleCallback(Hyperspace::EVENT_MASK_LOCK_ACQUIRED|
                                   Hyperspace::EVENT_MASK_LOCK_RELEASED),
        m_context(context), m_rsc(rsc), m_lock_held(false) { }

    virtual void lock_released() {
      HT_INFOF("%s hyperspace lock file released", m_rsc->location().c_str());
      {
        std::lock_guard<std::mutex> lock(m_mutex);
        m_lock_held = false;
        m_context->remove_available_server(m_rsc->location());
        m_cond.notify_all();
      }
      if (m_rsc->connected()) {
        uint32_t millis = m_context->props->get_i32("Hypertable.Failover.GracePeriod");
        m_context->recovery_barrier_op->advance_into_future(millis);
        OperationPtr operation = std::make_shared<OperationRecover>(m_context, m_rsc);
        try {
          m_context->op->add_operation(operation);
        }
        catch (Exception &e) {
          HT_INFOF("%s - %s", Error::get_text(e.code()), e.what());
        }
      }
      m_context->op->unblock(String("RegisterServerBlocker ") + m_rsc->location());
    }

    virtual void lock_acquired(uint32_t mode) {
      std::lock_guard<std::mutex> lock(m_mutex);
      HT_INFOF("%s hyperspace lock file acquired", m_rsc->location().c_str());
      m_lock_held = true;
      m_cond.notify_all();
    }

    bool wait_for_lock_acquisition(std::chrono::milliseconds max_wait) {
      std::unique_lock<std::mutex> lock(m_mutex);
      return m_cond.wait_for(lock, max_wait, [this](){ return m_lock_held; });
    }

  private:

    std::mutex m_mutex;

    std::condition_variable m_cond;

    ContextPtr m_context;

    RangeServerConnectionPtr m_rsc;

    bool m_lock_held;
  };

}

#endif // Hypertable_Master_RangeServerHyperspaceCallback_h