pub struct Snapshot {
pub committed_offsets: Vec<i64>,
pub dump: RlmmCacheDump,
}Expand description
A decoded snapshot: the per-metadata-partition committed offsets and
the cache dump to seed an InmemoryRemoteLogMetadataManager.
Fields§
§committed_offsets: Vec<i64>Highest offset applied into the cache per metadata partition, indexed
by metadata-partition. committed[p] == -1 means the snapshot covers
no events for p.
dump: RlmmCacheDumpThe cache contents at the moment the snapshot was taken.
Implementations§
Source§impl Snapshot
impl Snapshot
Sourcepub fn encode(&self) -> Result<Vec<u8>, SnapshotError>
pub fn encode(&self) -> Result<Vec<u8>, SnapshotError>
Encode this snapshot into freshly-allocated bytes.
§Errors
Returns SnapshotError::Malformed if committed_offsets contains
more than i32::MAX + 1 offsets, because its partition indices must
fit in the encoded i32 field, or if an entry fails to encode.
Sourcepub fn decode(bytes: &[u8]) -> Result<Self, SnapshotError>
pub fn decode(bytes: &[u8]) -> Result<Self, SnapshotError>
Decode a snapshot from bytes.
§Errors
Returns SnapshotError for any malformed input: a bad version, a
short or truncated buffer, a contained event that fails to decode, or
trailing bytes after the declared entries.
Sourcepub fn write_atomic(&self, path: &Path) -> Result<(), SnapshotError>
pub fn write_atomic(&self, path: &Path) -> Result<(), SnapshotError>
Atomically write this snapshot to path.
This method writes to a sibling temp file, fsyncs the file, renames it
over path, then fsyncs the parent directory so the rename itself is
durable. A crash at any point leaves either the old snapshot or none,
and never a torn file. This method removes the temp file if any step
before the rename fails, so a persistent error does not leave a stale
.tmp behind.
The directory fsync is best-effort. This method ignores filesystems that do not support it, and platforms where an open of a directory fails, rather than fails the write.
§Errors
Returns SnapshotError::Io on any filesystem failure up to and
including the rename.
Sourcepub fn load(path: &Path) -> Result<Option<Self>, SnapshotError>
pub fn load(path: &Path) -> Result<Option<Self>, SnapshotError>
Load a snapshot from path. Returns Ok(None) when the file does
not exist, which is the first boot. Returns Err when the file exists
but is corrupt. Returns Ok(Some) on success.
§Errors
Returns SnapshotError::Io for read failures other than
not-found, or a decode error for a present-but-malformed file.
Trait Implementations§
impl Eq for Snapshot
impl StructuralPartialEq for Snapshot
Auto Trait Implementations§
impl Freeze for Snapshot
impl RefUnwindSafe for Snapshot
impl Send for Snapshot
impl Sync for Snapshot
impl Unpin for Snapshot
impl UnsafeUnpin for Snapshot
impl UnwindSafe for Snapshot
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