Status.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 Common_Status_h
#define Common_Status_h

#include <Common/Serializable.h>

#include <mutex>
#include <string>
#include <utility>

namespace Hypertable {


  class Status : public Serializable {

  public:

    enum class Code: int32_t {
      OK = 0,
      WARNING = 1,
      CRITICAL = 2,
      UNKNOWN = 3
    };

    class Text {
    public:
      static constexpr const char *SERVER_IS_COMING_UP = "Server is coming up";
      static constexpr const char *SERVER_IS_SHUTTING_DOWN = "Server is shutting down";
      static constexpr const char *STANDBY = "Standby";
    };

    static const char *code_to_string(Code code);
    static Code string_to_code(std::string str);

    Status() { }

    Status(Code code, const std::string &text) : m_code(code), m_text(text) {}

    Status(const Status &other) {
      Code code;
      std::string text;
      other.get(&code, text);
      std::lock_guard<std::mutex> lock(m_mutex);      
      m_code = code;
      m_text.clear();
      m_text.append(text);
    }

    Status &operator=(const Status &rhs) {
      Status temp(rhs);
      std::swap(m_code, temp.m_code);
      std::swap(m_text, temp.m_text);
      return *this;
    }

    void set(Code code, const std::string &text) {
      std::lock_guard<std::mutex> lock(m_mutex);
      m_code = code;
      m_text.clear();
      m_text.append(text);
    }

    void get(Code *code, std::string &text) const {
      std::lock_guard<std::mutex> lock(m_mutex);
      *code = m_code;
      text = m_text;
    }

    Code get() {
      std::lock_guard<std::mutex> lock(m_mutex);
      return m_code;
    }

    std::string format_output_line(const std::string &service);

  private:

    uint8_t encoding_version() const override;

    size_t encoded_length_internal() const override;

    void encode_internal(uint8_t **bufp) const override;

    void decode_internal(uint8_t version, const uint8_t **bufp,
                         size_t *remainp) override;

    mutable std::mutex m_mutex;

    Code m_code {};

    std::string m_text;

  };

}


#endif // Common_Status_h