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Edit File : opt_trace_context.h \| Size : 3.21 KB
#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 */ Back

Edit File : opt_trace_context.h | Size : 3.21 KB

#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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