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/* Copyright (C) 2002-2006 MySQL AB, 2009 Sun Microsystems, Inc.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include "keycaches.h"
/****************************************************************************
Named list handling
****************************************************************************/
NAMED_ILIST key_caches;
/**
ilink (intrusive list element) with a name
*/
class NAMED_ILINK :public ilink
{
public:
const char *name;
uint name_length;
uchar* data;
NAMED_ILINK(I_List<NAMED_ILINK> *links, const char *name_arg,
uint name_length_arg, uchar* data_arg)
:name_length(name_length_arg), data(data_arg)
{
name= my_strndup(name_arg, name_length, MYF(MY_WME));
links->push_back(this);
}
inline bool cmp(const char *name_cmp, uint length)
{
return length == name_length && !memcmp(name, name_cmp, length);
}
~NAMED_ILINK()
{
my_free((void *) name);
}
};
uchar* find_named(I_List<NAMED_ILINK> *list, const char *name, uint length,
NAMED_ILINK **found)
{
I_List_iterator<NAMED_ILINK> it(*list);
NAMED_ILINK *element;
while ((element= it++))
{
if (element->cmp(name, length))
{
if (found)
*found= element;
return element->data;
}
}
return 0;
}
void NAMED_ILIST::delete_elements(void (*free_element)(const char *name, uchar*))
{
NAMED_ILINK *element;
DBUG_ENTER("NAMED_ILIST::delete_elements");
while ((element= get()))
{
(*free_element)(element->name, element->data);
delete element;
}
DBUG_VOID_RETURN;
}
/* Key cache functions */
LEX_STRING default_key_cache_base= {C_STRING_WITH_LEN("default")};
KEY_CACHE zero_key_cache; ///< @@nonexistent_cache.param->value_ptr() points here
KEY_CACHE *get_key_cache(LEX_STRING *cache_name)
{
if (!cache_name || ! cache_name->length)
cache_name= &default_key_cache_base;
return ((KEY_CACHE*) find_named(&key_caches,
cache_name->str, cache_name->length, 0));
}
KEY_CACHE *create_key_cache(const char *name, uint length)
{
KEY_CACHE *key_cache;
DBUG_ENTER("create_key_cache");
DBUG_PRINT("enter",("name: %.*s", length, name));
if ((key_cache= (KEY_CACHE*) my_malloc(sizeof(KEY_CACHE),
MYF(MY_ZEROFILL | MY_WME))))
{
if (!new NAMED_ILINK(&key_caches, name, length, (uchar*) key_cache))
{
my_free(key_cache);
key_cache= 0;
}
else
{
/*
Set default values for a key cache
The values in dflt_key_cache_var is set by my_getopt() at startup
We don't set 'buff_size' as this is used to enable the key cache
*/
key_cache->param_block_size= dflt_key_cache_var.param_block_size;
key_cache->param_division_limit= dflt_key_cache_var.param_division_limit;
key_cache->param_age_threshold= dflt_key_cache_var.param_age_threshold;
}
}
DBUG_RETURN(key_cache);
}
KEY_CACHE *get_or_create_key_cache(const char *name, uint length)
{
LEX_STRING key_cache_name;
KEY_CACHE *key_cache;
key_cache_name.str= (char *) name;
key_cache_name.length= length;
if (!(key_cache= get_key_cache(&key_cache_name)))
key_cache= create_key_cache(name, length);
return key_cache;
}
void free_key_cache(const char *name, KEY_CACHE *key_cache)
{
end_key_cache(key_cache, 1); // Can never fail
my_free(key_cache);
}
bool process_key_caches(process_key_cache_t func)
{
I_List_iterator<NAMED_ILINK> it(key_caches);
NAMED_ILINK *element;
while ((element= it++))
{
KEY_CACHE *key_cache= (KEY_CACHE *) element->data;
func(element->name, key_cache);
}
return 0;
}
#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
template class I_List_iterator<NAMED_ILINK>;
#endif
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