9d5b8c8de2
If two or more session commands contain identical buffers, the buffer of the first session command is shared between the others. This reduces the amount of memory used to store repeated executions of session commands. The purging of session command history in readwritesplit was replaced with session command de-duplication. This was done to prevent problems that could arise when the order of session commands plays a significant role.
103 lines
2.0 KiB
C++
103 lines
2.0 KiB
C++
/*
|
|
* Copyright (c) 2016 MariaDB Corporation Ab
|
|
*
|
|
* Use of this software is governed by the Business Source License included
|
|
* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
|
|
*
|
|
* Change Date: 2022-01-01
|
|
*
|
|
* On the date above, in accordance with the Business Source License, use
|
|
* of this software will be governed by version 2 or later of the General
|
|
* Public License.
|
|
*/
|
|
|
|
#include <maxscale/session_command.hh>
|
|
|
|
#include <maxscale/modutil.h>
|
|
#include <maxscale/protocol/mysql.h>
|
|
|
|
namespace maxscale
|
|
{
|
|
|
|
void SessionCommand::mark_reply_received()
|
|
{
|
|
m_reply_sent = true;
|
|
}
|
|
|
|
bool SessionCommand::is_reply_received() const
|
|
{
|
|
return m_reply_sent;
|
|
}
|
|
|
|
uint8_t SessionCommand::get_command() const
|
|
{
|
|
return m_command;
|
|
}
|
|
|
|
uint64_t SessionCommand::get_position() const
|
|
{
|
|
return m_pos;
|
|
}
|
|
|
|
GWBUF* SessionCommand::deep_copy_buffer()
|
|
{
|
|
GWBUF* temp = m_buffer.release();
|
|
GWBUF* rval = gwbuf_deep_clone(temp);
|
|
m_buffer.reset(temp);
|
|
return rval;
|
|
}
|
|
|
|
SessionCommand::SessionCommand(GWBUF *buffer, uint64_t id):
|
|
m_buffer(buffer),
|
|
m_command(0),
|
|
m_pos(id),
|
|
m_reply_sent(false)
|
|
{
|
|
if (buffer)
|
|
{
|
|
gwbuf_copy_data(buffer, MYSQL_HEADER_LEN, 1, &m_command);
|
|
}
|
|
}
|
|
|
|
SessionCommand::~SessionCommand()
|
|
{
|
|
}
|
|
|
|
bool SessionCommand::eq(const SessionCommand& rhs) const
|
|
{
|
|
return rhs.m_buffer.compare(m_buffer) == 0;
|
|
}
|
|
|
|
std::string SessionCommand::to_string()
|
|
{
|
|
std::string str;
|
|
char *sql;
|
|
int sql_len;
|
|
|
|
/** TODO: Create C++ versions of modutil functions */
|
|
GWBUF *buf = m_buffer.release();
|
|
|
|
if (!GWBUF_IS_CONTIGUOUS(buf))
|
|
{
|
|
buf = gwbuf_make_contiguous(buf);
|
|
}
|
|
|
|
if (modutil_extract_SQL(buf, &sql, &sql_len))
|
|
{
|
|
str.append(sql, sql_len);
|
|
}
|
|
|
|
m_buffer.reset(buf);
|
|
|
|
return str;
|
|
}
|
|
|
|
void SessionCommand::mark_as_duplicate(const SessionCommand& rhs)
|
|
{
|
|
ss_dassert(eq(rhs));
|
|
// The commands now share the mxs::Buffer that contains the actual command
|
|
m_buffer = rhs.m_buffer;
|
|
}
|
|
|
|
}
|