WL#2360 Performance schema

Part V: performance schema implementation

storage/perfschema/table_file_instances.h

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+/* Copyright (C) 2008-2009 Sun Microsystems, Inc
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; version 2 of the License.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#ifndef TABLE_FILE_INSTANCES_H
+#define TABLE_FILE_INSTANCES_H
+
+/**
+  @file storage/perfschema/table_file_instances.h
+  Table FILE_INSTANCES (declarations).
+*/
+
+#include "pfs_column_types.h"
+#include "pfs_engine_table.h"
+
+/**
+  @addtogroup Performance_schema_tables
+  @{
+*/
+
+/** A row of PERFORMANCE_SCHEMA.FILE_INSTANCES. */
+struct row_file_instances
+{
+  /** Column FILE_NAME. */
+  const char *m_filename;
+  /** Length in bytes of @c m_filename. */
+  uint m_filename_length;
+  /** Column EVENT_NAME. */
+  const char *m_event_name;
+  /** Length in bytes of @c m_event_name. */
+  uint m_event_name_length;
+  /** Column OPEN_COUNT. */
+  uint m_open_count;
+};
+
+/** Table PERFORMANCE_SCHEMA.FILE_INSTANCES. */
+class table_file_instances : public PFS_readonly_table
+{
+public:
+  /** Table share */
+  static PFS_engine_table_share m_share;
+  static PFS_engine_table* create();
+
+  virtual int rnd_next();
+  virtual int rnd_pos(const void *pos);
+  virtual void reset_position(void);
+
+private:
+  virtual int read_row_values(TABLE *table,
+                              unsigned char *buf,
+                              Field **fields,
+                              bool read_all);
+
+  table_file_instances();
+
+public:
+  ~table_file_instances()
+  {}
+
+private:
+  void make_row(PFS_file *pfs);
+
+  /** Table share lock. */
+  static THR_LOCK m_table_lock;
+  /** Fields definition. */
+  static TABLE_FIELD_DEF m_field_def;
+
+  /** Current row. */
+  row_file_instances m_row;
+  /** True is the current row exists. */
+  bool m_row_exists;
+  /** Current position. */
+  PFS_simple_index m_pos;
+  /** Next position. */
+  PFS_simple_index m_next_pos;
+};
+
+/** @} */
+#endif