Trait rustdb::stg::PageStorage

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pub trait PageStorage: Send + Sync {

Show 14 methods    // Required methods
    fn is_new(&self) -> bool;
    fn info(&self) -> Box<dyn PageStorageInfo>;
    fn new_page(&mut self) -> u64;
    fn drop_page(&mut self, pn: u64);
    fn set_page(&mut self, pn: u64, data: Data);
    fn get_page(&self, pn: u64) -> Data;
    fn size(&self, pn: u64) -> usize;
    fn save(&mut self);
    fn rollback(&mut self);
    fn wait_complete(&self);
    fn get_free(&mut self) -> (FxHashSet<u64>, u64);
    fn renumber(&mut self, pn: u64) -> u64;
    fn load_free_pages(&mut self) -> Option<u64>;
    fn set_alloc_pn(&mut self, target: u64);

}
Expand description

Interface for page storage.

Required Methods§

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fn is_new(&self) -> bool

Is the underlying storage new?

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fn info(&self) -> Box<dyn PageStorageInfo>

Information about page sizes.

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fn new_page(&mut self) -> u64

Make a new page, result is page number.

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fn drop_page(&mut self, pn: u64)

Drop page number.

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fn set_page(&mut self, pn: u64, data: Data)

Set contents of page.

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fn get_page(&self, pn: u64) -> Data

Get contents of page.

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fn size(&self, pn: u64) -> usize

Get page size (for repacking).

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fn save(&mut self)

Save pages to underlying storage.

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fn rollback(&mut self)

Undo changes since last save ( but set_page/renumber cannot be undone, only new_page and drop_page can be undone ).

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fn wait_complete(&self)

Wait until save is complete.

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fn get_free(&mut self) -> (FxHashSet<u64>, u64)

Get set of free pages and number of pages ever allocated ( for VERIFY builtin function ).

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fn renumber(&mut self, pn: u64) -> u64

Renumber page.

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fn load_free_pages(&mut self) -> Option<u64>

Load free pages in preparation for page renumbering. Returns number of used pages or None if there are no free pages.

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fn set_alloc_pn(&mut self, target: u64)

Final part of page renumber operation.

Implementors§