Struct mz_persist::location::Tasked

pub struct Tasked<A>(pub Arc<A>);

Wraps all calls to a backing store in a new tokio task. This adds extra overhead, but insulates the system from callers who fail to drive futures promptly to completion, which can cause timeouts or resource exhaustion in a store.

Tuple Fields

0: Arc<A>

Trait Implementations

impl<A: Blob + Sync + Send + 'static> Blob for Tasked<A>

fn list_keys_and_metadata<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, key_prefix: &'life1 str, f: &'life2 mut (dyn FnMut(BlobMetadata<'_>) + Send + Sync) ) -> Pin<Box<dyn Future<Output = Result<(), ExternalError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

List all of the keys in the map with metadata about the entry.

Can be optionally restricted to only list keys starting with a given prefix.

fn set<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str, value: Bytes ) -> Pin<Box<dyn Future<Output = Result<(), ExternalError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Inserts a key-value pair into the map.

fn delete<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str ) -> Pin<Box<dyn Future<Output = Result<Option<usize>, ExternalError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Remove a key from the map.

Returns Some and the size of the deleted blob if if exists. Succeeds and returns None if it does not exist.

fn get<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str ) -> Pin<Box<dyn Future<Output = Result<Option<SegmentedBytes>, ExternalError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Returns a reference to the value corresponding to the key.

fn restore<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str ) -> Pin<Box<dyn Future<Output = Result<(), ExternalError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Restores a previously-deleted key to the map, if possible.

impl<A: Consensus + Sync + Send + 'static> Consensus for Tasked<A>

fn list_keys(&self) -> ResultStream<'_, String>

Returns all the keys ever created in the consensus store.

fn head<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str ) -> Pin<Box<dyn Future<Output = Result<Option<VersionedData>, ExternalError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Returns a recent version of data, and the corresponding sequence number, if one exists at this location.

fn compare_and_set<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str, expected: Option<SeqNo>, new: VersionedData ) -> Pin<Box<dyn Future<Output = Result<CaSResult, ExternalError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Update the VersionedData stored at this location to new, iff the current sequence number is exactly expected and new’s sequence number > the current sequence number.

fn scan<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str, from: SeqNo, limit: usize ) -> Pin<Box<dyn Future<Output = Result<Vec<VersionedData>, ExternalError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Return limit versions of data stored for this key at sequence numbers >= from, in ascending order of sequence number.

fn truncate<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str, seqno: SeqNo ) -> Pin<Box<dyn Future<Output = Result<usize, ExternalError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Deletes all historical versions of the data stored at key that are < seqno, iff seqno <= the current sequence number.

impl<A: Debug> Debug for Tasked<A>

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

Formats the value using the given formatter.