DictCache.hpp
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上传日期:2022-05-23
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- /* Copyright (C) 2003 MySQL AB
- This program 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; either version 2 of the License, or
- (at your option) any later version.
- This program 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- #ifndef DictCache_H
- #define DictCache_H
- #include <ndb_types.h>
- #include <kernel_types.h>
- #include <NdbError.hpp>
- #include <BaseString.hpp>
- #include <Vector.hpp>
- #include <UtilBuffer.hpp>
- #include <NdbDictionary.hpp>
- #include <Ndb.hpp>
- #include <NdbCondition.h>
- #include "NdbLinHash.hpp"
- class Ndb_local_table_info {
- public:
- static Ndb_local_table_info *create(NdbTableImpl *table_impl, Uint32 sz=0);
- static void destroy(Ndb_local_table_info *);
- NdbTableImpl *m_table_impl;
- Uint64 m_local_data[1]; // Must be last member. Used to access extra space.
- private:
- Ndb_local_table_info(NdbTableImpl *table_impl);
- ~Ndb_local_table_info();
- };
- /**
- * A non thread safe dict cache
- */
- class LocalDictCache {
- public:
- LocalDictCache();
- ~LocalDictCache();
-
- Ndb_local_table_info * get(const char * name);
-
- void put(const char * name, Ndb_local_table_info *);
- void drop(const char * name);
-
- NdbLinHash<Ndb_local_table_info> m_tableHash; // On name
- };
- /**
- * A thread safe dict cache
- */
- class GlobalDictCache : public NdbLockable {
- public:
- GlobalDictCache();
- ~GlobalDictCache();
-
- NdbTableImpl * get(const char * name);
-
- NdbTableImpl* put(const char * name, NdbTableImpl *);
- void drop(NdbTableImpl *);
- void release(NdbTableImpl *);
- void alter_table_rep(const char * name,
- Uint32 tableId, Uint32 tableVersion, bool altered);
- public:
- enum Status {
- OK = 0,
- DROPPED = 1,
- RETREIVING = 2
- };
-
- private:
- struct TableVersion {
- Uint32 m_version;
- Uint32 m_refCount;
- NdbTableImpl * m_impl;
- Status m_status;
- };
-
- NdbLinHash<Vector<TableVersion> > m_tableHash;
- NdbCondition * m_waitForTableCondition;
- };
- #endif