std_db_content.hpp

См. документацию.

/*

Copyright (c) 2002-2005, Yauheni Akhotnikau
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

- Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.

- Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or
other materials provided with the distribution.

- The name of the author may not be used to endorse or promote products derived
from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
OF SUCH DAMAGE.

*/

/*
  ObjESSty-1
*/

#if !defined( _OESS_1__DB__IMPL__DB_CONTENT__STD_DB_CONTENT_HPP_ )
#define _OESS_1__DB__IMPL__DB_CONTENT__STD_DB_CONTENT_HPP_

#include <auto_ptr_3/h/obj_ptr.hpp>

#include <oess_1/db/storage/h/stream_storage.hpp>

#include <oess_1/db/impl/db_content/h/db_content.hpp>
#include <oess_1/db/impl/db_content/h/client_map.hpp>

namespace oess_1
{

namespace db
{

namespace impl
{

namespace db_content
{

//
// trans_owner_info_t
//

class trans_owner_info_t
{
public :
  trans_owner_info_t();
  ~trans_owner_info_t();


  void
  begin(
    const std::string & client_id );

  void
  commit();

  void
  rollback();


  void
  must_be_owner(
    const std::string & client_id ) const;


  bool
  is_owner(
    const std::string & client_id ) const;

  inline bool
  is_started() const
  {
    return !m_owner.empty();
  }

  inline void
  cleanup()
  {
    m_owner = "";
  }

private :

  std::string m_owner;
};

//
// std_db_content_t
//

class std_db_content_t :
  public db_content_t
{
  public :
    std_db_content_t();
    virtual ~std_db_content_t();

    virtual void
    open(
      const std::string & name,
      const oess_1::db::storage::config_t & config,
      bool is_read_only,
      bool is_auto_repair_enabled );

    virtual void
    client_attach(
      const std::string & client_id );

    virtual void
    client_detach(
      const std::string & client_id );

    virtual oess_1::uint_t
    client_count() const;

    virtual void
    slice_create(
      const std::string & client_id,
      const std::string & name );

    virtual void
    slice_destroy(
      const std::string & client_id,
      const std::string & name );

    virtual bool
    slice_is_exists(
      const std::string & client_id,
      const std::string & name );

    virtual std::set< std::string >
    slice_names(
      const std::string & client_id );

    virtual oess_1::ent_id_t
    ent_create(
      const std::string & client_id,
      const std::string & slice_name,
      oess_1::io::istream_t & ent_value,
      oess_1::uint_t ent_size );

    virtual void
    ent_destroy(
      const std::string & client_id,
      const oess_1::ent_id_t & ent_id );

    virtual void
    ent_destroy_all(
      const std::string & client_id,
      const std::string & slice_name );

    virtual void
    ent_load(
      const std::string & client_id,
      const oess_1::ent_id_t & ent_id,
      oess_1::io::ostream_t & ent_value );

    virtual void
    ent_update(
      const std::string & client_id,
      const oess_1::ent_id_t & ent_id,
      oess_1::io::istream_t & ent_value,
      oess_1::uint_t ent_size );

    virtual oess_1::ent_id_t
    ent_find_next(
      const std::string & client_id,
      const std::string & slice_name,
      const oess_1::ent_id_t & ent_id );

    virtual void
    transaction_begin(
      const std::string & client_id );

    virtual void
    transaction_commit(
      const std::string & client_id );

    virtual void
    transaction_rollback(
      const std::string & client_id );

  private :

    auto_ptr_3::obj_ptr_t< oess_1::db::storage::stream_storage_t >
        m_storage;

    enum
    {
      connection_only = 0,
      must_be_transaction_owner = 1
    };

    bool  m_is_open;

    std::auto_ptr< client_map_t > m_client_map_ptr;


    trans_owner_info_t  m_transaction_owner;


    unsigned int  m_trans_deep;


    void
    sys_trans_start();


    void
    sys_trans_finish();


    void
    careful_sys_trans_rollback();

    void
    cleanup();

    void
    must_be_open() const;


    void
    check_for_client(
      const std::string & client_id,
      unsigned int actions ) const;


    oess_1::db::storage::entity_stream_t &
    slice_for_entity_search(
      const std::string & slice_name,
      const oess_1::ent_id_t & ent_id );
};

} /* namespace db_content */

} /* namespace impl */

} /* namespace db */

} /* namespace oess_1 */

#endif

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