alloc_cache.h

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/*
 * (c) Copyright 2011-2013, Hewlett-Packard Development Company, LP
 */

#ifndef __ALLOC_CACHE_H
#define __ALLOC_CACHE_H

#include "w_defines.h"
#include "alloc_page.h"
#include "latch.h"
#include "stnode_page.h"
#include <map>
#include <vector>
#include <unordered_set>

class bf_fixed_m;

class alloc_cache_t {
public:
    alloc_cache_t(stnode_cache_t& stcache, bool virgin, bool clustered);

    rc_t sx_allocate_page(PageID& pid, StoreID stid = 0);

    rc_t sx_deallocate_page(PageID pid);

    rc_t sx_format_alloc_page(PageID alloc_pid);

    bool is_allocated(PageID pid);

    PageID get_last_allocated_pid(StoreID s) const;

    PageID get_last_allocated_pid() const;

    PageID _get_last_allocated_pid_internal() const;

    lsn_t get_page_lsn(PageID pid);

    static constexpr size_t extent_size = alloc_page::bits_held;

    static bool is_alloc_pid(PageID pid) {
        return pid % extent_size == 0;
    }

private:

    std::vector<PageID> last_alloc_page;

    stnode_cache_t& stcache;

    mutable srwlock_t _latch;

    rc_t load_alloc_page(StoreID stid, extent_id_t ext);
};

#endif // __ALLOC_CACHE_H