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/*
* 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.
*
*/
#ifndef PLUGIN_LOGGING_STATS_SCOREBOARD_H
#define PLUGIN_LOGGING_STATS_SCOREBOARD_H
#include "scoreboard_slot.h"
#include <drizzled/session.h>
#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);
/**
* Resets the ScoreboardSlot this session was using. The pointer
* returned is a copy of the ScoreboardSlot that has now been
* reclaimed. This must be deallocated by the caller, when the caller
* is finished. This allows cumulative collection of statistics.
*
* @param Pointer to the session
* @return Pointer to a copy of the ScoreboardSlot that has been
* reclaimed
*/
ScoreboardSlot* findAndResetScoreboardSlot(drizzled::Session *session);
uint32_t getNumberBuckets()
{
return number_buckets;
}
std::vector<pthread_rwlock_t* >* getVectorOfScoreboardLocks()
{
return &vector_of_scoreboard_locks;
}
std::vector<std::vector<ScoreboardSlot* >* >* getVectorOfScoreboardVectors()
{
return &vector_of_scoreboard_vectors;
}
private:
static const int32_t UNINITIALIZED= -1;
uint32_t number_sessions;
uint32_t number_buckets;
std::vector<std::vector<ScoreboardSlot* >* > vector_of_scoreboard_vectors;
std::vector<pthread_rwlock_t* > vector_of_scoreboard_locks;
};
#endif /* PLUGIN_LOGGING_STATS_SCOREBOARD_H */
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