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/*
* Copyright (C) 2010 Djellel Eddine Difallah
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Djellel Eddine Difallah nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <config.h>
#include <drizzled/session.h>
#include "query_cache_service.h"
#include <drizzled/table_list.h>
using namespace std;
namespace drizzled
{
QueryCacheService::CacheEntries QueryCacheService::cache;
QueryCacheService::CachedTablesEntries QueryCacheService::cachedTables;
message::Resultset *QueryCacheService::setCurrentResultsetMessage(Session *in_session)
{
message::Resultset *resultset= in_session->getResultsetMessage();
if (unlikely(resultset == NULL))
{
/* Allocate and initialize a new Resultset message
* for this Session object. Session is responsible for
* deleting Resultset message when done with it.
*/
resultset= new (nothrow) message::Resultset();
in_session->setResultsetMessage(resultset);
/* for Atomic purpose, reserve an entry for the following query
*/
cache[in_session->query_cache_key]= message::Resultset();
}
return resultset;
}
void QueryCacheService::setResultsetHeader(message::Resultset &resultset,
Session *in_session,
TableList *in_table)
{
/* Set up the Select header */
message::SelectHeader *header= resultset.mutable_select_header();
(void) in_session;
/* Extract all the tables mentioned in the query and
* add the metadata to the SelectHeader
*/
for (TableList* tmp_table= in_table; tmp_table; tmp_table= tmp_table->next_global)
{
message::TableMeta *table_meta= header->add_table_meta();
table_meta->set_schema_name(tmp_table->db, strlen(tmp_table->db));
table_meta->set_table_name(tmp_table->table_name, strlen(tmp_table->table_name));
/* Populate the cached tables hash */
QueryCacheService::cachedTables[strcat(tmp_table->db, tmp_table->table_name)].push_back(in_session->query_cache_key);
}
/* Extract the returned fields
* and add the field data to the SelectHeader
*/
List<Item>::iterator it(in_session->lex().select_lex.item_list);
Item *item;
while ((item=it++))
{
SendField field;
item->make_field(&field);
message::FieldMeta *field_meta= header->add_field_meta();
field_meta->set_field_name(field.col_name, strlen(field.col_name));
field_meta->set_schema_name(field.db_name, strlen(field.db_name));
field_meta->set_table_name(field.table_name, strlen(field.table_name));
field_meta->set_field_alias(field.org_col_name, strlen(field.org_col_name));
field_meta->set_table_alias(field.org_table_name, strlen(field.org_table_name));
}
}
bool QueryCacheService::addRecord(Session *in_session, List<Item> &list)
{
message::Resultset *resultset= in_session->getResultsetMessage();
if (resultset != NULL)
{
message::SelectData *data= resultset->mutable_select_data();
data->set_segment_id(1);
data->set_end_segment(true);
message::SelectRecord *record= data->add_record();
List<Item>::iterator li(list);
char buff[MAX_FIELD_WIDTH];
String buffer(buff, sizeof(buff), &my_charset_bin);
Item *current_field;
while ((current_field= li++))
{
if (current_field->is_null())
{
record->add_is_null(true);
record->add_record_value("", 0);
}
else
{
String *string_value= current_field->val_str(&buffer);
record->add_is_null(false);
record->add_record_value(string_value->c_ptr(), string_value->length());
string_value->free();
}
}
return false;
}
return true;
}
bool QueryCacheService::isCached(string query)
{
CacheEntries::iterator it= QueryCacheService::cache.find(query);
if (it != QueryCacheService::cache.end())
return true;
return false;
}
} /* namespace drizzled */
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