ChangeManager

objectstore_service::backend::changelog

Struct ChangeManager

pub struct ChangeManager { /* private fields */ }

Expand description

Manager for multi-step storage changes, including backends and durable log.

Encapsulates the state and logic for recording changes, advancing their phases, and performing cleanup on drop. The TieredStorage backend holds an instance of this manager to use it for its multi-step operations.

Implementations§

impl ChangeManager

pub fn new( high_volume: Box<dyn HighVolumeBackend>, long_term: Box<dyn Backend>, changelog: Box<dyn ChangeLog>, ) -> Arc<Self>

Creates a new ChangeManager with the given backends and changelog.

pub async fn record(self: Arc<Self>, change: Change) -> Result<ChangeGuard>

Records the change to the log and returns a guard.

Generates a unique ChangeId and writes a durable log entry before returning. The caller may proceed with LT side effects immediately after.

When the ChangeGuard is dropped, a background process is spawned to clean up any unreferenced objects in LT storage.

pub async fn recover(self: Arc<Self>) -> Result<()>

Scans the changelog for outstanding entries and runs cleanup for each.

Spawn this into a background task at startup to recover from any orphaned objects after a crash. During normal operation, this should return an empty list and have no effect.

Trait Implementations§

impl Debug for ChangeManager

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

impl Freeze for ChangeManager

impl !RefUnwindSafe for ChangeManager

impl Send for ChangeManager

impl Sync for ChangeManager

impl Unpin for ChangeManager

impl !UnwindSafe for ChangeManager

Blanket Implementations§

impl<T> Any for T
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