pub struct BlobMeta { /* private fields */ }Expand description
What a blob claims about itself, judged against one document.
Every field is a verdict rather than a measurement, because the engine’s own metadata types must not cross this crate’s boundary: pinning them in a caller would pin the engine. The verdicts exist so a caller can decide not to import, which is the only decision that helps when the bytes came off a network rather than out of a sealed record.
Implementations§
Source§impl BlobMeta
impl BlobMeta
Sourcepub fn already_applied(self) -> bool
pub fn already_applied(self) -> bool
Whether this document already holds every change the blob carries.
True for the ordinary redelivery a ladder promising at-least-once produces. Importing anyway would be merely wasteful for a fresh document and actively dangerous for a compacted one, which is why this is checked before anything reaches the engine.
Sourcepub fn spans_trimmed_history(self) -> bool
pub fn spans_trimmed_history(self) -> bool
Whether the blob needs history this document has compacted away.
A shallow snapshot trims history below a point, and the engine has an
open defect where changes referring below that point panic instead of
erroring, poisoning the document’s lock as they go. Caught, that
panic still leaves the document unusable for the process, and under
panic = "abort" there is nothing to catch: the only defense is
never handing such a blob over.
It is asked of a whole document as well as of a run of changes, and the two are asked differently. A snapshot carries its own base, so the question for one is not where it starts but whether it still covers what this document kept: a replica that trimmed history can merge a snapshot that contains the ops it retained, and aborts on one that does not. Exempting snapshots because they are self contained reads well and is wrong, because the missing ancestors are missing from the receiver.
A caller seeing this on a run of changes asks for a snapshot. A caller seeing it on a snapshot has reached the end of what replication can do: the peer forked below a point this replica deleted, and nothing either side can send carries the ancestors back.
Sourcepub fn is_snapshot(self) -> bool
pub fn is_snapshot(self) -> bool
Whether the blob is a snapshot rather than a run of updates.
Sourcepub fn change_count(self) -> u32
pub fn change_count(self) -> u32
How many changes the blob claims to carry.
Trait Implementations§
impl Copy for BlobMeta
impl Eq for BlobMeta
impl StructuralPartialEq for BlobMeta
Auto Trait Implementations§
impl Freeze for BlobMeta
impl RefUnwindSafe for BlobMeta
impl Send for BlobMeta
impl Sync for BlobMeta
impl Unpin for BlobMeta
impl UnsafeUnpin for BlobMeta
impl UnwindSafe for BlobMeta
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