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/* -*- C++ -*- */
/* Copyright (C) 2002 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 _SP_CACHE_H_
#define _SP_CACHE_H_
#ifdef USE_PRAGMA_INTERFACE
#pragma interface /* gcc class implementation */
#endif
/*
Stored procedures/functions cache. This is used as follows:
* Each thread has its own cache.
* Each sp_head object is put into its thread cache after creation and is
removed from there on its deletion.
*/
class sp_head;
class sp_cache;
/* Initialize the SP caching once at startup */
void sp_cache_init();
/* Clear the cache *cp and set *cp to NULL */
void sp_cache_clear(sp_cache **cp);
/* Insert an SP into cache. If 'cp' points to NULL, it's set to a new cache */
void sp_cache_insert(sp_cache **cp, sp_head *sp);
/* Lookup an SP in cache */
sp_head *sp_cache_lookup(sp_cache **cp, sp_name *name);
/*
Remove an SP from cache, and also bump the Cversion number so all other
caches are invalidated.
Returns true if something was removed.
*/
bool sp_cache_remove(sp_cache **cp, sp_name *name);
/* Invalidate all existing SP caches by bumping Cversion number. */
void sp_cache_invalidate();
/*
*
* The cache class. Don't use this directly, use the C API above
*
*/
class sp_cache
{
public:
ulong version;
sp_cache();
~sp_cache();
void
init();
void
cleanup();
inline void
insert(sp_head *sp)
{
my_hash_insert(&m_hashtable, (const byte *)sp);
}
inline sp_head *
lookup(char *name, uint namelen)
{
return (sp_head *)hash_search(&m_hashtable, (const byte *)name, namelen);
}
inline bool
remove(char *name, uint namelen)
{
sp_head *sp= lookup(name, namelen);
if (sp)
{
hash_delete(&m_hashtable, (byte *)sp);
return TRUE;
}
return FALSE;
}
inline void
remove_all()
{
cleanup();
init();
}
private:
HASH m_hashtable;
}; // class sp_cache
#endif /* _SP_CACHE_H_ */
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