Struct PagePool

pub struct PagePool { /* private fields */ }

A page pool of currently unused pages available for use in Pages.

Implementations

impl PagePool

pub fn new_for_test() -> Self

pub fn new(max_size: Option<usize>) -> Self

Returns a new page pool with max_size bytes rounded down to the nearest multiple of 64 KiB.

if no size is provided, a default of 1 page is used.

pub fn put(&self, page: Box<Page>)

Puts back a Page into the pool.

pub fn put_many(&self, pages: impl Iterator<Item = Box<Page>>)

Puts back a Page into the pool.

pub fn take_with_fixed_row_size(&self, fixed_row_size: Size) -> Box<Page>

Takes a Page from the pool or creates a new one.

The returned page supports fixed rows of size fixed_row_size.

pub fn take_deserialize_from( &self, buf: &[u8], ) -> Result<Box<Page>, DecodeError>

Deserialize a page from buf but reuse the allocations in the pool.

pub fn dropped_pages_count(&self) -> usize

Returns the number of pages dropped by the pool because the pool was at capacity.

pub fn new_pages_allocated_count(&self) -> usize

Returns the number of fresh pages allocated through the pool.

pub fn pages_reused_count(&self) -> usize

Returns the number of pages reused from the pool.

pub fn pages_returned_count(&self) -> usize

Returns the number of pages returned to the pool.

Trait Implementations

impl Clone for PagePool

fn clone(&self) -> PagePool

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'de> DeserializeSeed<'de> for &PagePool

type Output = Box<Page>

The type produced by using this seed.

fn deserialize<D: Deserializer<'de>>( self, de: D, ) -> Result<Self::Output, D::Error>

Equivalent to the more common Deserialize::deserialize associated function, except with some initial piece of data (the seed self) passed in.

impl MemoryUsage for PagePool

fn heap_usage(&self) -> usize

The heap memory usage of this type. The default implementation returns 0.

impl<'de> ProductVisitor<'de> for &PagePool

type Output = Box<Page>

The resulting product.

fn product_name(&self) -> Option<&str>

Returns the name of the product, if any.

fn product_len(&self) -> usize

Returns the length of the product.

fn visit_seq_product<A: SeqProductAccess<'de>>( self, prod: A, ) -> Result<Self::Output, A::Error>

The input contains an unnamed product.

fn visit_named_product<A: NamedProductAccess<'de>>( self, _: A, ) -> Result<Self::Output, A::Error>

The input contains a named product.

fn product_kind(&self) -> ProductKind

Returns the kind of the product.