tablespace.h

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/* Copyright (c) 2014, 2024, Oracle and/or its affiliates.
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.
 
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.
 
   You should have received a copy of the GNU General Public License
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef DD__TABLESPACE_INCLUDED
#define DD__TABLESPACE_INCLUDED
 
#include <vector>
 
#include "lex_string.h"
#include "my_inttypes.h"
#include "sql/dd/collection.h"            // dd::Collection
#include "sql/dd/impl/raw/object_keys.h"  // IWYU pragma: keep
#include "sql/dd/sdi_fwd.h"               // RJ_Document
#include "sql/dd/types/entity_object.h"   // dd::Entity_object
#include "sql/mdl.h"                      // enum enum_mdl_type
 
class THD;
class MDL_request;
 
namespace dd {
 
///////////////////////////////////////////////////////////////////////////
 
class Global_name_key;
class Properties;
class Tablespace_impl;
class Tablespace_file;
class Void_key;
 
namespace tables {
class Tablespaces;
}
 
///////////////////////////////////////////////////////////////////////////
 
class Tablespace : virtual public Entity_object {
 public:
  typedef Tablespace_impl Impl;
  typedef Tablespace Cache_partition;
  typedef tables::Tablespaces DD_table;
  typedef Primary_id_key Id_key;
  typedef Global_name_key Name_key;
  typedef Void_key Aux_key;
  typedef Collection<Tablespace_file *> Tablespace_file_collection;
 
  // We need a set of functions to update a preallocated key.
  virtual bool update_id_key(Id_key *key) const {
    return update_id_key(key, id());
  }
 
  static bool update_id_key(Id_key *key, Object_id id);
 
  virtual bool update_name_key(Name_key *key) const {
    return update_name_key(key, name());
  }
 
  static bool update_name_key(Name_key *key, const String_type &name);
 
  virtual bool update_aux_key(Aux_key *) const { return true; }
 
 public:
  ~Tablespace() override = default;
 
  /**
    Check if the tablespace is empty, i.e., whether it has any tables.
 
    @param       thd      Thread context.
    @param [out] empty    Whether the tablespace is empty.
 
    @return true if error, false if success.
  */
 
  virtual bool is_empty(THD *thd, bool *empty) const = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // comment.
  /////////////////////////////////////////////////////////////////////////
 
  virtual const String_type &comment() const = 0;
  virtual void set_comment(const String_type &comment) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // options.
  /////////////////////////////////////////////////////////////////////////
 
  virtual const Properties &options() const = 0;
 
  virtual Properties &options() = 0;
  virtual bool set_options(const String_type &options_raw) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // se_private_data.
  /////////////////////////////////////////////////////////////////////////
 
  virtual const Properties &se_private_data() const = 0;
 
  virtual Properties &se_private_data() = 0;
  virtual bool set_se_private_data(const String_type &se_private_data_raw) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // Engine.
  /////////////////////////////////////////////////////////////////////////
 
  virtual const String_type &engine() const = 0;
  virtual void set_engine(const String_type &engine) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // SE-specific json attributes
  /////////////////////////////////////////////////////////////////////////
 
  virtual LEX_CSTRING engine_attribute() const = 0;
  virtual void set_engine_attribute(LEX_CSTRING a) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // Tablespace file collection.
  /////////////////////////////////////////////////////////////////////////
 
  virtual Tablespace_file *add_file() = 0;
 
  virtual bool remove_file(String_type data_file) = 0;
 
  virtual const Tablespace_file_collection &files() const = 0;
 
  /**
    Allocate a new object graph and invoke the copy constructor for
    each object.
 
    @return pointer to dynamically allocated copy
  */
  virtual Tablespace *clone() const = 0;
 
  /**
    Allocate a new object which can serve as a placeholder for the original
    object in the Dictionary_client's dropped registry. Such object has the
    same keys as the original but has no other info and as result occupies
    less memory.
  */
  virtual Tablespace *clone_dropped_object_placeholder() const = 0;
 
  /**
    Converts *this into json.
 
    Converts all member variables that are to be included in the sdi
    into json by transforming them appropriately and passing them to
    the rapidjson writer provided.
 
    @param wctx opaque context for data needed by serialization
    @param w rapidjson writer which will perform conversion to json
 
  */
 
  virtual void serialize(Sdi_wcontext *wctx, Sdi_writer *w) const = 0;
 
  /**
    Re-establishes the state of *this by reading sdi information from
    the rapidjson DOM subobject provided.
 
    Cross-references encountered within this object are tracked in
    sdictx, so that they can be updated when the entire object graph
    has been established.
 
    @param rctx stores book-keeping information for the
    deserialization process
    @param val subobject of rapidjson DOM containing json
    representation of this object
  */
 
  virtual bool deserialize(Sdi_rcontext *rctx, const RJ_Value &val) = 0;
};
 
///////////////////////////////////////////////////////////////////////////
 
/**
  Represents tables with their id, name, schema id and schema name.
  Needed to keep track of information when querying the dd to find
  tables in a tablespace.
 */
struct Tablespace_table_ref {
  Object_id m_id;
  String_type m_name;
  Object_id m_schema_id;
  String_type m_schema_name;
  bool m_schema_encryption;
  Tablespace_table_ref() = default; /* purecov: inspected */
  Tablespace_table_ref(Object_id id, const String_type &&name,
                       Object_id schema_id)
      : m_id{id},
        m_name{std::move(name)},
        m_schema_id{schema_id},
        m_schema_encryption{false} {}
};
 
bool operator==(const Tablespace_table_ref &a, const Tablespace_table_ref &b);
 
bool operator<(const Tablespace_table_ref &a, const Tablespace_table_ref &b);
 
typedef std::vector<Tablespace_table_ref> Tablespace_table_ref_vec;
 
/**
  Fetch (by inserting into tblref vector) Tablespace_table_ref objects
  which describe tables in a given tablespace.
 
  @param thd thread context
  @param tso dd object
  @param tblrefs [OUT] Tablespace_table_ref objects for tables in tablespace
  @retval true if error occurred
  @retval false otherwise
 */
bool fetch_tablespace_table_refs(THD *thd, const Tablespace &tso,
                                 Tablespace_table_ref_vec *tblrefs);
 
/**
  Create am MDL_request for a the table identified by a Tablespace_table_ref.
  @param thd thread context
  @param tref table to create request for
  @param mdl_type The lock type requested.
  @retval MDL_request (allocated on thd->memroot)
 */
MDL_request *mdl_req(THD *thd, const Tablespace_table_ref &tref,
                     enum enum_mdl_type mdl_type);
 
/**
  Create am MDL_request for a the schema name provided.
  @param thd thread context
  @param schema_name on which to create request for
  @retval MDL_request (allocated on thd->memroot)
 */
MDL_request *mdl_schema_req(THD *thd, const dd::String_type &schema_name);
 
}  // namespace dd
 
#endif  // DD__TABLESPACE_INCLUDED