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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 "invalidator.h"
#include "query_cache_service.h"
#include "memcached_qc.h"
#include <drizzled/session.h>
#include <drizzled/message/transaction.pb.h>
#include <drizzled/message/table.pb.h>
#include <drizzled/message/statement_transform.h>
#include <vector>
#include <string>
#include <algorithm>
using namespace drizzled;
using namespace std;
Invalidator::Invalidator(string name_arg)
:
plugin::TransactionApplier(name_arg)
{
}
plugin::ReplicationReturnCode
Invalidator::apply(Session &in_session,
const message::Transaction &to_apply)
{
(void) in_session;
string schema_name;
string table_name;
size_t stmt_size= to_apply.statement_size();
for (size_t i= 0; i < stmt_size; i++)
{
schema_name.clear();
table_name.clear();
const message::Statement &stmt= to_apply.statement(i);
/*
* We don't handle raw SQL for now.
*/
if (stmt.type() != message::Statement::RAW_SQL)
{
parseStatementTableMetadata(stmt, schema_name, table_name);
}
else
{
continue; /* go on to the next statement */
}
/* Now lets invalidate all the entries of the table */
invalidateByTableName(schema_name, table_name);
}
return plugin::SUCCESS;
}
void Invalidator::parseStatementTableMetadata(const message::Statement &in_statement,
string &in_schema_name,
string &in_table_name) const
{
switch (in_statement.type())
{
case message::Statement::INSERT:
{
const message::TableMetadata &metadata= in_statement.insert_header().table_metadata();
in_schema_name.assign(metadata.schema_name());
in_table_name.assign(metadata.table_name());
break;
}
case message::Statement::UPDATE:
{
const message::TableMetadata &metadata= in_statement.update_header().table_metadata();
in_schema_name.assign(metadata.schema_name());
in_table_name.assign(metadata.table_name());
break;
}
case message::Statement::DELETE:
{
const message::TableMetadata &metadata= in_statement.delete_header().table_metadata();
in_schema_name.assign(metadata.schema_name());
in_table_name.assign(metadata.table_name());
break;
}
case message::Statement::CREATE_SCHEMA:
{
in_schema_name.assign(in_statement.create_schema_statement().schema().name());
in_table_name.clear();
break;
}
case message::Statement::ALTER_SCHEMA:
{
in_schema_name.assign(in_statement.alter_schema_statement().after().name());
in_table_name.clear();
break;
}
case message::Statement::DROP_SCHEMA:
{
in_schema_name.assign(in_statement.drop_schema_statement().schema_name());
in_table_name.clear();
break;
}
case message::Statement::CREATE_TABLE:
{
in_schema_name.assign(in_statement.create_table_statement().table().schema());
in_table_name.assign(in_statement.create_table_statement().table().name());
break;
}
case message::Statement::ALTER_TABLE:
{
in_schema_name.assign(in_statement.alter_table_statement().before().schema());
in_table_name.assign(in_statement.alter_table_statement().before().name());
break;
}
case message::Statement::DROP_TABLE:
{
const message::TableMetadata &metadata= in_statement.drop_table_statement().table_metadata();
in_schema_name.assign(metadata.schema_name());
in_table_name.assign(metadata.table_name());
break;
}
default:
{
/* All other types have no schema and table information */
in_schema_name.clear();
in_table_name.clear();
break;
}
}
}
void Invalidator::invalidateByTableName(const std::string &in_schema_name,
const std::string &in_table_name) const
{
/* Reconstitute the schema+table key */
string key= in_schema_name+in_table_name;
/* Lookup for the invalidated table in the cached tables map */
QueryCacheService::CachedTablesEntries::iterator itt= QueryCacheService::cachedTables.find(key);
if (itt != QueryCacheService::cachedTables.end())
{
/* Extract the invloved hashes from the map and lookup the local Cache*/
QueryCacheService::CachedTablesEntry &entry= *itt;
vector<string>::iterator hash;
for(hash= entry.second.begin(); hash != entry.second.end(); hash++)
{
QueryCacheService::CacheEntries::iterator it= QueryCacheService::cache.find(*hash);
if (it != QueryCacheService::cache.end())
{
/* Remove the Query from the local Cache */
QueryCacheService::cache.erase(*hash);
/* Remove the Query from Memcached immediatly */
MemcachedQueryCache::getClient()->remove(*hash, 0);
}
}
/* finaly remove the table from the cached table list */
QueryCacheService::cachedTables.erase(key);
}
}
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