PageCircularBuffer.h

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/*****************************************************************************
 *                                                                           *
 *  Copyright 2018 Rice University                                           *
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 *  Licensed under the Apache License, Version 2.0 (the "License");          *
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 *      http://www.apache.org/licenses/LICENSE-2.0                           *
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 *  Unless required by applicable law or agreed to in writing, software      *
 *  distributed under the License is distributed on an "AS IS" BASIS,        *
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 *  See the License for the specific language governing permissions and      *
 *  limitations under the License.                                           *
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#ifndef PAGECIRCULARBUFFER_H
#define PAGECIRCULARBUFFER_H

#include "PDBPage.h"
#include "PDBLogger.h"
#include <pthread.h>
#include <memory>
using namespace std;
class PageCircularBuffer;
typedef shared_ptr<PageCircularBuffer> PageCircularBufferPtr;

class PageCircularBuffer {
public:
    PageCircularBuffer(unsigned int bufferSize, pdb::PDBLoggerPtr logger);
    ~PageCircularBuffer();

    int addPageToTail(PDBPagePtr page);

    PDBPagePtr popPageFromHead();

    bool isFull();

    bool isEmpty();

    unsigned int getSize();

    void close();

    void open();


    bool isClosed() {
        return closed;
    }

protected:
    PDBPagePtr* getPageArray() {
        return pageArray;
    }

    unsigned int getPageArrayHead() {
        return pageArrayHead;
    }

    unsigned int getPageArrayTail() {
        return pageArrayTail;
    }

    unsigned int getMaxArraySize() {
        return maxArraySize;
    }

    int initArray();

private:
    PDBPagePtr* pageArray;
    pdb::PDBLoggerPtr logger;
    unsigned int maxArraySize;
    unsigned int pageArrayHead;
    unsigned int pageArrayTail;
    pthread_mutex_t mutex;
    pthread_mutex_t addPageMutex;
    pthread_cond_t cond;
    bool closed;
};


#endif /* PAGECIRCULARBUFFER_H */