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/* -*- C++ -*- */
/* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
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; version 2 of the License.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#ifndef _SP_CACHE_H_
#define _SP_CACHE_H_
#ifdef USE_PRAGMA_INTERFACE
#pragma interface /* gcc class implementation */
#endif
#include "my_global.h" /* ulong */
/*
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 before it is used, and
then remains in the cache until deleted.
*/
class sp_head;
class sp_cache;
class sp_name;
/*
Cache usage scenarios:
1. Application-wide init:
sp_cache_init();
2. SP execution in thread:
2.1 While holding sp_head* pointers:
// look up a routine in the cache (no checks if it is up to date or not)
sp_cache_lookup();
sp_cache_insert();
sp_cache_invalidate();
2.2 When not holding any sp_head* pointers:
sp_cache_flush_obsolete();
3. Before thread exit:
sp_cache_clear();
*/
void sp_cache_init();
void sp_cache_end();
void sp_cache_clear(sp_cache **cp);
void sp_cache_insert(sp_cache **cp, sp_head *sp);
sp_head *sp_cache_lookup(sp_cache **cp, sp_name *name);
void sp_cache_invalidate();
void sp_cache_flush_obsolete(sp_cache **cp, sp_head **sp);
ulong sp_cache_version();
void sp_cache_enforce_limit(sp_cache *cp, ulong upper_limit_for_elements);
#endif /* _SP_CACHE_H_ */
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