~drizzle-trunk/drizzle/development : contents of plugin/logging

~drizzle-trunk/drizzle/development : (revision 2403)

/*
 * Copyright (C) 2010 Joseph Daly <skinny.moey@gmail.com>
 * 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 Joseph Daly 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.
 *
 */

#pragma once

#include "scoreboard_slot.h"
#include <boost/thread/shared_mutex.hpp>

#include <vector>

class Scoreboard
{
public:
  Scoreboard(uint32_t in_number_sessions, uint32_t in_number_buckets);

  ~Scoreboard();

  /**
   * Locates a ScoreboardSlot that is not in use, marks the slot
   * as being used and returns a pointer to it. The caller can
   * update individual statistics via the pointer without having
   * to lock or worry about concurrent updates.  
   * 
   * @param Pointer to the session 
   * @return Pointer to the ScoreboardSlot whose individual statistics 
   *   can be updated
   */
  ScoreboardSlot* findScoreboardSlotToLog(drizzled::Session *session);

  /**
   * Finds the ScoreboardSlot for a given session. This function differs
   * from findAndResetScoreboardSlot() as it returns the actual pointer
   * rather then a copy. Its possible that values could be changed in 
   * the underlying status variables, callers should beware. 
   */
  ScoreboardSlot* findOurScoreboardSlot(drizzled::Session *session);

  uint32_t getBucketNumber(drizzled::Session*) const;

  uint32_t getNumberBuckets() const
  {
    return number_buckets;
  }

  uint32_t getNumberPerBucket() const
  {
    return number_per_bucket;
  }

  uint64_t getScoreboardSizeBytes() const
  {
    return scoreboard_size_bytes;
  } 

  std::vector<boost::shared_mutex* >* getVectorOfScoreboardLocks()
  {
    return &vector_of_scoreboard_locks;
  }

  std::vector<std::vector<ScoreboardSlot* >* >* getVectorOfScoreboardVectors()
  {
    return &vector_of_scoreboard_vectors; 
  }

private:
  uint32_t number_sessions;
  uint32_t number_per_bucket;
  uint32_t number_buckets;
  uint64_t scoreboard_size_bytes;
  std::vector<std::vector<ScoreboardSlot*>*> vector_of_scoreboard_vectors;
  std::vector<boost::shared_mutex*> vector_of_scoreboard_locks;

  ScoreboardSlot* claimOpenScoreboardSlot(drizzled::Session *session); 
};


1320.5.6 by Joe Daly first pass at using a module vector approach of scoreboard	1	/*
1999.6.1 by kalebral at gmail update Copyright strings to a more common format to help with creating the master debian copyright file	2	* Copyright (C) 2010 Joseph Daly <skinny.moey@gmail.com>
1320.5.6 by Joe Daly first pass at using a module vector approach of scoreboard	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions are met:
	7	*
	8	* * Redistributions of source code must retain the above copyright notice,
	9	* this list of conditions and the following disclaimer.
	10	* * Redistributions in binary form must reproduce the above copyright notice,
	11	* this list of conditions and the following disclaimer in the documentation
	12	* and/or other materials provided with the distribution.
	13	* * Neither the name of Joseph Daly nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	18	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	21	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	22	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	23	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	24	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	25	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	26	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	27	* THE POSSIBILITY OF SUCH DAMAGE.
	28	*
	29	*/
	30
2234 by Brian Aker Mass removal of ifdef/endif in favor of pragma once.	31	#pragma once
1320.5.6 by Joe Daly first pass at using a module vector approach of scoreboard	32
	33	#include "scoreboard_slot.h"
1683.1.1 by Joe Daly use boost for locking instead of pthread	34	#include <boost/thread/shared_mutex.hpp>
1320.5.6 by Joe Daly first pass at using a module vector approach of scoreboard	35
	36	#include <vector>
	37
	38	class Scoreboard
	39	{
	40	public:
	41	Scoreboard(uint32_t in_number_sessions, uint32_t in_number_buckets);
	42
	43	~Scoreboard();
	44
1320.5.13 by Joe Daly add description and comments to various files	45	/**
	46	* Locates a ScoreboardSlot that is not in use, marks the slot
	47	* as being used and returns a pointer to it. The caller can
	48	* update individual statistics via the pointer without having
	49	* to lock or worry about concurrent updates.
	50	*
	51	* @param Pointer to the session
	52	* @return Pointer to the ScoreboardSlot whose individual statistics
1320.5.17 by Joe Daly clean up some unneeded destructors and add update comments	53	* can be updated
1320.5.13 by Joe Daly add description and comments to various files	54	*/
1320.5.6 by Joe Daly first pass at using a module vector approach of scoreboard	55	ScoreboardSlot* findScoreboardSlotToLog(drizzled::Session *session);
	56
1320.5.13 by Joe Daly add description and comments to various files	57	/**
1561.3.2 by Joe Daly add session_status_new	58	* Finds the ScoreboardSlot for a given session. This function differs
	59	* from findAndResetScoreboardSlot() as it returns the actual pointer
	60	* rather then a copy. Its possible that values could be changed in
	61	* the underlying status variables, callers should beware.
	62	*/
	63	ScoreboardSlot* findOurScoreboardSlot(drizzled::Session *session);
	64
2318.8.8 by Olaf van der Spek Refactor Scoreboard	65	uint32_t getBucketNumber(drizzled::Session*) const;
1491.4.6 by Joe Daly rework stats_schema use static char * for command strings	66
2318.8.8 by Olaf van der Spek Refactor Scoreboard	67	uint32_t getNumberBuckets() const
1320.5.6 by Joe Daly first pass at using a module vector approach of scoreboard	68	{
	69	return number_buckets;
	70	}
	71
2318.8.8 by Olaf van der Spek Refactor Scoreboard	72	uint32_t getNumberPerBucket() const
1711.7.2 by Joseph Daly add memory usage	73	{
	74	return number_per_bucket;
	75	}
	76
2318.8.8 by Olaf van der Spek Refactor Scoreboard	77	uint64_t getScoreboardSizeBytes() const
1711.7.1 by Joseph Daly merge trunk	78	{
	79	return scoreboard_size_bytes;
	80	}
	81
1683.1.1 by Joe Daly use boost for locking instead of pthread	82	std::vector<boost::shared_mutex* >* getVectorOfScoreboardLocks()
1320.5.6 by Joe Daly first pass at using a module vector approach of scoreboard	83	{
1320.5.7 by Joe Daly get tests to work, need to fix read lock on stats_schema current commands	84	return &vector_of_scoreboard_locks;
1320.5.6 by Joe Daly first pass at using a module vector approach of scoreboard	85	}
	86
	87	std::vector<std::vector<ScoreboardSlot* >* >* getVectorOfScoreboardVectors()
	88	{
1320.5.7 by Joe Daly get tests to work, need to fix read lock on stats_schema current commands	89	return &vector_of_scoreboard_vectors;
1320.5.6 by Joe Daly first pass at using a module vector approach of scoreboard	90	}
	91
	92	private:
	93	uint32_t number_sessions;
1711.7.2 by Joseph Daly add memory usage	94	uint32_t number_per_bucket;
1320.5.6 by Joe Daly first pass at using a module vector approach of scoreboard	95	uint32_t number_buckets;
1711.7.1 by Joseph Daly merge trunk	96	uint64_t scoreboard_size_bytes;
2318.8.8 by Olaf van der Spek Refactor Scoreboard	97	std::vector<std::vector<ScoreboardSlot>> vector_of_scoreboard_vectors;
2318.8.8 by Olaf van der Spek Refactor Scoreboard	98	std::vector<boost::shared_mutex*> vector_of_scoreboard_locks;
1491.4.15 by Joe Daly remove com_stat_vars and rework lock in scoreboard to not lock on Sessions locating a slot they previously owned	99
1561.3.2 by Joe Daly add session_status_new	100	ScoreboardSlot* claimOpenScoreboardSlot(drizzled::Session *session);
1320.5.6 by Joe Daly first pass at using a module vector approach of scoreboard	101	};
	102