Current File : //usr/include/mysql/server/private/opt_trace_context.h
#ifndef OPT_TRACE_CONTEXT_INCLUDED
#define OPT_TRACE_CONTEXT_INCLUDED
#include "sql_array.h"
class Opt_trace_context;
struct Opt_trace_info;
class Json_writer;
class Opt_trace_stmt {
public:
/**
Constructor, starts a trace for information_schema and dbug.
@param ctx_arg context
*/
Opt_trace_stmt(Opt_trace_context *ctx_arg);
~Opt_trace_stmt();
void set_query(const char *query_ptr, size_t length, const CHARSET_INFO *charset);
void open_struct(const char *key, char opening_bracket);
void close_struct(const char *saved_key, char closing_bracket);
void fill_info(Opt_trace_info* info);
void add(const char *key, char *opening_bracket, size_t val_length);
Json_writer* get_current_json() {return current_json;}
void missing_privilege();
void disable_tracing_for_children();
void enable_tracing_for_children();
bool is_enabled()
{
return I_S_disabled == 0;
}
void set_allowed_mem_size(size_t mem_size);
size_t get_length();
size_t get_truncated_bytes();
bool get_missing_priv() { return missing_priv; }
private:
Opt_trace_context *ctx;
String query; // store the query sent by the user
Json_writer *current_json; // stores the trace
bool missing_priv; ///< whether user lacks privilege to see this trace
/*
0 <=> this trace should be in information_schema.
!=0 tracing is disabled, this currently happens when we want to trace a
sub-statement. For now traces are only collect for the top statement
not for the sub-statments.
*/
uint I_S_disabled;
};
class Opt_trace_context
{
public:
Opt_trace_context();
~Opt_trace_context();
void start(THD *thd, TABLE_LIST *tbl,
enum enum_sql_command sql_command,
const char *query,
size_t query_length,
const CHARSET_INFO *query_charset,
ulong max_mem_size_arg);
void end();
void set_query(const char *query, size_t length, const CHARSET_INFO *charset);
void delete_traces();
void set_allowed_mem_size(size_t mem_size);
size_t remaining_mem_size();
private:
Opt_trace_stmt* top_trace()
{
return *(traces.front());
}
public:
/*
This returns the top trace from the list of traces. This function
is used when we want to see the contents of the INFORMATION_SCHEMA.OPTIMIZER_TRACE
table.
*/
Opt_trace_stmt* get_top_trace()
{
if (!traces.elements())
return NULL;
return top_trace();
}
/*
This returns the current trace, to which we are still writing and has not been finished
*/
Json_writer* get_current_json()
{
if (!is_started())
return NULL;
return current_trace->get_current_json();
}
bool empty()
{
return static_cast<uint>(traces.elements()) == 0;
}
bool is_started()
{
return current_trace && current_trace->is_enabled();
}
bool disable_tracing_if_required();
bool enable_tracing_if_required();
bool is_enabled();
void missing_privilege();
static const char *flag_names[];
enum
{
FLAG_DEFAULT = 0,
FLAG_ENABLED = 1 << 0
};
private:
/*
List of traces (currently it stores only 1 trace)
*/
Dynamic_array<Opt_trace_stmt*> traces;
Opt_trace_stmt *current_trace;
size_t max_mem_size;
};
#endif /* OPT_TRACE_CONTEXT_INCLUDED */
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