Struct pagecache::Reservation

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pub struct Reservation<'a> { /* private fields */ }

Expand description

A pending log reservation which can be aborted or completed. NB the holder should quickly call complete or abort as taking too long to decide will cause the underlying IO buffer to become blocked.

Implementations

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impl<'a> Reservation<'a>

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pub fn abort(self) -> Result<(Lsn, DiskPtr), ()>

Cancel the reservation, placing a failed flush on disk, returning the (cancelled) log sequence number and file offset.

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pub fn complete(self) -> Result<(Lsn, DiskPtr), ()>

Complete the reservation, placing the buffer on disk. returns the log sequence number of the write, and the file offset.

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pub fn lid(&self) -> LogId

Get the log file offset for reading this buffer in the future.

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pub fn lsn(&self) -> Lsn

Get the log sequence number for this update.

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pub fn ptr(&self) -> DiskPtr

Get the underlying storage location for the written value. Note that an blob write still has a pointer in the log at the provided lid location.

Trait Implementations

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impl<'a> Drop for Reservation<'a>

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fn drop(&mut self)

Executes the destructor for this type. Read more

Auto Trait Implementations

impl<'a> !RefUnwindSafe for Reservation<'a>

impl<'a> Send for Reservation<'a>

impl<'a> Sync for Reservation<'a>

impl<'a> Unpin for Reservation<'a>

impl<'a> !UnwindSafe for Reservation<'a>

Blanket Implementations

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impl<T> Any for Twhere
T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for Twhere
T: ?Sized,

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for Twhere
T: ?Sized,

const: unstable · source

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for Twhere
U: From<T>,

const: unstable · source

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

impl<T> Pointable for T

const ALIGN: usize = mem::align_of::<T>()

The alignment of pointer.

type Init = T

The type for initializers.

unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more

unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more

unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more

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impl<T, U> TryFrom for Twhere
U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

Performs the conversion.

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impl<T, U> TryInto for Twhere
U: TryFrom<T>,

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

Struct pagecache::Reservation

Implementations

impl<'a> Reservation<'a>

pub fn abort(self) -> Result<(Lsn, DiskPtr), ()>

pub fn complete(self) -> Result<(Lsn, DiskPtr), ()>

pub fn lid(&self) -> LogId

pub fn lsn(&self) -> Lsn

pub fn ptr(&self) -> DiskPtr

Trait Implementations

impl<'a> Drop for Reservation<'a>

fn drop(&mut self)

Auto Trait Implementations

impl<'a> !RefUnwindSafe for Reservation<'a>

impl<'a> Send for Reservation<'a>

impl<'a> Sync for Reservation<'a>

impl<'a> Unpin for Reservation<'a>

impl<'a> !UnwindSafe for Reservation<'a>

Blanket Implementations

impl<T> Any for Twhere T: 'static + ?Sized,

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for Twhere T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for Twhere T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

impl<T> From<T> for T

fn from(t: T) -> T

impl<T, U> Into<U> for Twhere U: From<T>,

fn into(self) -> U

impl<T> Pointable for T

const ALIGN: usize = mem::align_of::<T>()

type Init = T

unsafe fn init(init: <T as Pointable>::Init) -> usize

unsafe fn deref<'a>(ptr: usize) -> &'a T

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

unsafe fn drop(ptr: usize)

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

impl<T> Any for Twhere
T: 'static + ?Sized,

impl<T> Borrow<T> for Twhere
T: ?Sized,

impl<T> BorrowMut<T> for Twhere
T: ?Sized,

impl<T, U> Into<U> for Twhere
U: From<T>,

impl<T, U> TryFrom<U> for Twhere
U: Into<T>,

impl<T, U> TryInto<U> for Twhere
U: TryFrom<T>,