Struct txn_types::WriteRef[][src]

pub struct WriteRef<'a> {
    pub write_type: WriteType,
    pub start_ts: TimeStamp,
    pub short_value: Option<&'a [u8]>,
    pub has_overlapped_rollback: bool,
    pub gc_fence: Option<TimeStamp>,
}

Fields

write_type: WriteTypestart_ts: TimeStampshort_value: Option<&'a [u8]>has_overlapped_rollback: bool

The commit_ts of transactions can be non-globally-unique. But since we store Rollback records in the same CF where Commit records is, and Rollback records are saved with user_key{start_ts} as the internal key, the collision between Commit and Rollback records can’t be avoided. In this case, we keep the Commit record, and set the has_overlapped_rollback flag to indicate that there’s also a Rollback record. Also note that has_overlapped_rollback field is only necessary when the Rollback record should be protected.

gc_fence: Option<TimeStamp>

Records the next version after this version when overlapping rollback happens on an already existed commit record.

See Write::gc_fence for more detail.

Implementations

impl WriteRef<'_>[src]

pub fn parse(b: &[u8]) -> Result<WriteRef<'_>>[src]

pub fn to_bytes(&self) -> Vec<u8>[src]

fn pre_allocate_size(&self) -> usize[src]

pub fn check_gc_fence_as_latest_version(&self, read_ts: TimeStamp) -> bool[src]

Prev Conditions:

  • The Write record self is referring to is the latest version found by reading at read_ts
  • The read_ts is safe, which means, it’s not earlier than the current GC safepoint. Return: Whether the Write record is valid, ie. there’s no GC fence or GC fence doesn’t points to any other version.

pub fn is_protected(&self) -> bool[src]

pub fn to_owned(&self) -> Write[src]

Trait Implementations

impl<'a> Clone for WriteRef<'a>[src]

impl<'a> PartialEq<WriteRef<'a>> for WriteRef<'a>[src]

impl<'a> StructuralPartialEq for WriteRef<'a>[src]

Auto Trait Implementations

impl<'a> RefUnwindSafe for WriteRef<'a>

impl<'a> Send for WriteRef<'a>

impl<'a> Sync for WriteRef<'a>

impl<'a> Unpin for WriteRef<'a>

impl<'a> UnwindSafe for WriteRef<'a>

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
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impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<T> From<T> for T[src]

impl<T> Instrument for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
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impl<T> Pointable for T[src]

type Init = T

The type for initializers.

impl<T> Same<T> for T[src]

type Output = T

Should always be Self

impl<T> Sealed<T> for T where
    T: ?Sized
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impl<T> SendSyncUnwindSafe for T where
    T: Send + Sync + UnwindSafe + ?Sized
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impl<T> ToOwned for T where
    T: Clone
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type Owned = T

The resulting type after obtaining ownership.

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
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type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<V, T> VZip<V> for T where
    V: MultiLane<T>, 
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