pub struct RawReadPlan { /* private fields */ }Expand description
A raw read planned under the log lock, to run without it.
The plan holds a view of each segment the read may walk, taken by
Log::plan_raw_read, and the read’s bounds and policy. Running it is
the header walks, the readahead hints, the copies or descriptions and the
drops of cold pages that Log::read_raw and Log::read_raw_desc do,
and it needs nothing of the log: the views hold the file handles, and
read up to the sizes they saw.
Implementations§
Source§impl RawReadPlan
impl RawReadPlan
Sourcepub fn may_block(&self) -> bool
pub fn may_block(&self) -> bool
Whether running the plan may wait on more than the page cache:
Log::read_may_block for the read’s offset, as of the plan. A
caller that must not block a runtime thread runs such a plan away
from it.
Sourcepub fn offset_bound(&self) -> Offset
pub fn offset_bound(&self) -> Offset
The offset the read cannot reach: the end of the last segment the plan
may walk, or the read’s limit, whichever is lower; the read’s own
offset when there is nothing to walk. A caller that needs the log’s
view of the bytes the read may serve, such as the aborted transactions
a read_committed fetch reports beside them, takes it for this range
under the lock with the plan: bounded by the segment or two the read
may touch, not by the whole log behind it.
Sourcepub fn read_bytes(&self) -> Result<RawRead, LogError>
pub fn read_bytes(&self) -> Result<RawRead, LogError>
Run the plan as Log::read_raw would have read.
§Errors
Returns an error when log I/O fails or a record or index is corrupt.
Sourcepub fn read_regions(&self) -> Result<RawReadDesc, LogError>
pub fn read_regions(&self) -> Result<RawReadDesc, LogError>
Run the plan as Log::read_raw_desc would have read.
§Errors
Returns an error when log I/O fails or a record or index is corrupt.
Trait Implementations§
Source§impl Clone for RawReadPlan
impl Clone for RawReadPlan
Source§fn clone(&self) -> RawReadPlan
fn clone(&self) -> RawReadPlan
1.0.0 (const: unstable) · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read moreAuto Trait Implementations§
impl !RefUnwindSafe for RawReadPlan
impl !UnwindSafe for RawReadPlan
impl Freeze for RawReadPlan
impl Send for RawReadPlan
impl Sync for RawReadPlan
impl Unpin for RawReadPlan
impl UnsafeUnpin for RawReadPlan
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