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Viewing changes to plugin/information_engine/information_engine.h

  • Committer: Brian Aker
  • Date: 2010-02-19 23:07:45 UTC
  • mto: (1273.13.97 build)
  • mto: This revision was merged to the branch mainline in revision 1309.
  • Revision ID: brian@gaz-20100219230745-cmurfbxj845it9z7
This remove the original info_schema system for the server. More still to
cut, but we are on our way.

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plugin/information_engine/information_engine.h
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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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 *
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 *  Copyright (C) 2009 Sun Microsystems
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 *
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 *  This program is free software; you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation; either version 2 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program; if not, write to the Free Software
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 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
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#ifndef PLUGIN_INFORMATION_ENGINE_INFORMATION_ENGINE_H
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#define PLUGIN_INFORMATION_ENGINE_INFORMATION_ENGINE_H
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#include <drizzled/thr_lock.h>
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#include <drizzled/plugin/info_schema_table.h>
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#include <drizzled/plugin/storage_engine.h>
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static const char *information_exts[] = {
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  NULL
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};
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class InformationEngine : public drizzled::plugin::StorageEngine
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{
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public:
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  InformationEngine(const std::string &name_arg)
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    : drizzled::plugin::StorageEngine(name_arg,
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                                      drizzled::HTON_ALTER_NOT_SUPPORTED |
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                                      drizzled::HTON_SKIP_STORE_LOCK |
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                                      drizzled::HTON_HIDDEN |
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                                      drizzled::HTON_TEMPORARY_NOT_SUPPORTED)
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  {
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    pthread_mutex_init(&mutex, NULL);
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  }
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  ~InformationEngine()
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  {
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    pthread_mutex_destroy(&mutex);
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  }
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  class Share
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  {
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  private:
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    uint32_t count;
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    drizzled::plugin::InfoSchemaTable *table;
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  public:
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    drizzled::THR_LOCK lock;
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    Share(const std::string &in_name) :
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      count(1)
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    {
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      table= drizzled::plugin::InfoSchemaTable::getTable(in_name.c_str());
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    }
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    ~Share()  {}
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    void initThreadLock()
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    {
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      thr_lock_init(&lock);
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    }
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    void deinitThreadLock()
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    {
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      thr_lock_delete(&lock);
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    }
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    /**
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     * Increment the counter which tracks how many instances of this share are
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     * currently open.
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     * @return the new counter value
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   */
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    uint32_t incUseCount(void) 
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    { 
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      return ++count; 
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    }
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    /**
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     * Decrement the count which tracks how many instances of this share are
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     * currently open.
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     * @return the new counter value
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   */
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    uint32_t decUseCount(void) 
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    { 
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      return --count; 
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    }
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    /**
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     * @ return the value of the use counter for this share
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   */
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    uint32_t getUseCount() const
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    {
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      return count;
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    }
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    /**
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     * @return the table name associated with this share.
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   */
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    const std::string &getName() const
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    {
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      return table->getTableName();
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    }
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    /**
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     * Set the I_S table associated with this share.
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     * @param[in] name the name of the I_S table
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     */
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    void setInfoSchemaTable(const std::string &name)
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    {
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      table= drizzled::plugin::InfoSchemaTable::getTable(name.c_str());
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    }
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    /**
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     * @return the I_S table associated with this share.
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     */
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    drizzled::plugin::InfoSchemaTable *getInfoSchemaTable()
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    {
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      return table;
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    }
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  };
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private:
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  typedef std::map<const std::string, Share> OpenTables;
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  typedef std::pair<const std::string, Share> Record;
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  OpenTables open_tables;
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  pthread_mutex_t mutex; // Mutext used in getShare() calls
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public:
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  // Follow Two Methods are for "share"
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  Share *getShare(const std::string &name_arg);
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  void freeShare(Share *share);
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  int doCreateTable(drizzled::Session *,
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                    const char *,
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                    drizzled::Table&,
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                    drizzled::message::Table&)
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  {
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    return EPERM;
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  }
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  int doDropTable(drizzled::Session&, const std::string) 
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  { 
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    return EPERM; 
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  }
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  virtual drizzled::Cursor *create(drizzled::TableShare &table,
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                                   drizzled::memory::Root *mem_root);
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  const char **bas_ext() const 
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  {
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    return information_exts;
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  }
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  void doGetTableNames(drizzled::CachedDirectory&, 
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                       std::string &db, 
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                       std::set<std::string> &set_of_names);
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  int doGetTableDefinition(drizzled::Session &session,
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                           const char *path,
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                           const char *db,
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                           const char *table_name,
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                           const bool is_tmp,
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                           drizzled::message::Table *table_proto);
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};
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#endif /* PLUGIN_INFORMATION_ENGINE_INFORMATION_ENGINE_H */