page_evictioner.hpp

Go to the documentation of this file.

#ifndef __ZERO_SM_PAGE_EVICTIONER_HPP
#define __ZERO_SM_PAGE_EVICTIONER_HPP

#include "sm_options.h"
#include "worker_thread.h"
#include "buffer_pool_pointer_swizzling.hpp"

struct bf_tree_cb_t;

namespace zero::buffer_pool {
    using namespace zero::buffer_pool;

    class PageEvictioner : public worker_thread_t {
    public:
        explicit PageEvictioner(const BufferPool* bufferPool);

        PageEvictioner(const PageEvictioner&) = delete;

        PageEvictioner& operator=(const PageEvictioner&) = delete;

        virtual ~PageEvictioner();

        virtual bf_idx pickVictim() noexcept = 0;

        virtual void updateOnPageHit(bf_idx idx) noexcept = 0;

        virtual void updateOnPageUnfix(bf_idx idx) noexcept = 0;

        virtual void updateOnPageMiss(bf_idx idx, PageID pid) noexcept = 0;

        virtual void updateOnPageFixed(bf_idx idx) noexcept = 0;

        virtual void updateOnPageDirty(bf_idx idx) noexcept = 0;

        virtual void updateOnPageBlocked(bf_idx idx) noexcept = 0;

        virtual void updateOnPageSwizzled(bf_idx idx) noexcept = 0;

        virtual void updateOnPageExplicitlyUnbuffered(bf_idx idx) noexcept = 0;

        virtual void updateOnPointerSwizzling(bf_idx idx) noexcept = 0;

        virtual void releaseInternalLatches() noexcept = 0;

        bool evictOne(bf_idx& victim);

    protected:
        static constexpr bool _enabledSwizzling = POINTER_SWIZZLER::usesPointerSwizzling;

        const bool _maintainEMLSN;

        const bool _flushDirty;

        const bool _logEvictions;

        const uint_fast32_t _evictionBatchSize;

        const uint_fast32_t _maxAttempts;

        const uint_fast32_t _wakeupCleanerAttempts = 42;

    protected:
        bool _doEviction(bf_idx victim) noexcept;

    private:
        bool _unswizzleAndUpdateEMLSN(bf_idx victim) noexcept;

        void _flushDirtyPage(const bf_tree_cb_t& victimControlBlock) noexcept;

        void do_work() override;
    };
} // zero::buffer_pool

#endif // __ZERO_SM_PAGE_EVICTIONER_HPP