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/*
* Copyright (C) 2011 Regents of the University of Michigan
*
* 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, either version 3 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef __SAM_RECORD_POOL_H__
#define __SAM_RECORD_POOL_H__
#include <queue>
#include "SamRecord.h"
class SamRecordPool
{
public:
/// Constructor that sets there to be no max number of allocated records.
SamRecordPool();
/// Constructor that sets the maximum number of allocated records
/// \param maxNumRecs maximum number of allocated records (-1 means no max)
SamRecordPool(int maxNumRecs);
/// Destructor. Any records that were allocated without calling "releaseRecord"
/// will not get cleaned up and the user will need to delete them.
~SamRecordPool();
/// Get a SamRecord. If records are already allocated and free use those, if not
/// and there are still more that are allowed to be allocated, allocate a new one.
/// If no more records are allowed to be allocated, NULL is returned.
/// NOTE: The user should call releaseRecord when done using the record.
/// If the user deletes the record instead, it still counts as allocated when
/// comparing against the maxNumRecs but cannot be reused.
/// \return pointer to a SamRecord available for use, or NULL if no more records
/// are allowed to be allocated.
SamRecord* getRecord();
/// If record is not NULL, adds it back to the free list.
/// If record is NULL, nothing is done.
/// \param record pointer to a record that is no longer being used
/// and is available for reuse.
void releaseRecord(SamRecord* record);
/// Set the maximum number of records allowed to be allocated.
/// If more than the new value have already been allocated,
/// it does not deallocate any, and will continue to reuse
/// the already allocated records, but it will not allocate
/// any additional records.
void setMaxAllocatedRecs(int maxNumRecs);
private:
std::queue<SamRecord*> myFreeSamRecords;
int myMaxAllowedRecs;
int myAllocatedRecs;
};
#endif
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