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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.
*
*/
#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);
};
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