Struct catalog::kvbackend::CachedMetaKvBackend
source · pub struct CachedMetaKvBackend {
kv_backend: KvBackendRef,
cache: Cache<Vec<u8>, KeyValue>,
name: String,
version: AtomicUsize,
}
Expand description
A wrapper of MetaKvBackend
with cache support.
CachedMetaKvBackend is mainly used to read metadata information from Metasrv, and provides cache for get and batch_get. One way to trigger cache invalidation of CachedMetaKvBackend: when metadata information changes, Metasrv will broadcast a metadata invalidation request.
Therefore, it is recommended to use CachedMetaKvBackend to only read metadata related information. Note: If you read other information, you may read expired data, which depends on TTL and TTI for cache.
Fields§
§kv_backend: KvBackendRef
§cache: Cache<Vec<u8>, KeyValue>
§name: String
§version: AtomicUsize
Implementations§
Trait Implementations§
source§impl KvBackend for CachedMetaKvBackend
impl KvBackend for CachedMetaKvBackend
fn name(&self) -> &str
fn as_any(&self) -> &dyn Any
fn range<'life0, 'async_trait>(
&'life0 self,
req: RangeRequest,
) -> Pin<Box<dyn Future<Output = Result<RangeResponse>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
fn put<'life0, 'async_trait>(
&'life0 self,
req: PutRequest,
) -> Pin<Box<dyn Future<Output = Result<PutResponse>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
fn batch_put<'life0, 'async_trait>(
&'life0 self,
req: BatchPutRequest,
) -> Pin<Box<dyn Future<Output = Result<BatchPutResponse>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
fn batch_get<'life0, 'async_trait>(
&'life0 self,
req: BatchGetRequest,
) -> Pin<Box<dyn Future<Output = Result<BatchGetResponse>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
source§fn compare_and_put<'life0, 'async_trait>(
&'life0 self,
req: CompareAndPutRequest,
) -> Pin<Box<dyn Future<Output = Result<CompareAndPutResponse>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
fn compare_and_put<'life0, 'async_trait>(
&'life0 self,
req: CompareAndPutRequest,
) -> Pin<Box<dyn Future<Output = Result<CompareAndPutResponse>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
CAS: Compares the value at the key with the given value, and if they are
equal, puts the new value at the key.
fn delete_range<'life0, 'async_trait>(
&'life0 self,
req: DeleteRangeRequest,
) -> Pin<Box<dyn Future<Output = Result<DeleteRangeResponse>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
fn batch_delete<'life0, 'async_trait>(
&'life0 self,
req: BatchDeleteRequest,
) -> Pin<Box<dyn Future<Output = Result<BatchDeleteResponse>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
fn get<'life0, 'life1, 'async_trait>(
&'life0 self,
key: &'life1 [u8],
) -> Pin<Box<dyn Future<Output = Result<Option<KeyValue>>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait,
§fn put_conditionally<'life0, 'async_trait>(
&'life0 self,
key: Vec<u8>,
value: Vec<u8>,
if_not_exists: bool,
) -> Pin<Box<dyn Future<Output = Result<bool, Self::Error>> + Send + 'async_trait>>where
'life0: 'async_trait,
Self: Sync + 'async_trait,
fn put_conditionally<'life0, 'async_trait>(
&'life0 self,
key: Vec<u8>,
value: Vec<u8>,
if_not_exists: bool,
) -> Pin<Box<dyn Future<Output = Result<bool, Self::Error>> + Send + 'async_trait>>where
'life0: 'async_trait,
Self: Sync + 'async_trait,
Puts a value at a key. If
if_not_exists
is true
, the operation
ensures the key does not exist before applying the PUT operation.
Otherwise, it simply applies the PUT operation without checking for
the key’s existence.§fn exists<'life0, 'life1, 'async_trait>(
&'life0 self,
key: &'life1 [u8],
) -> Pin<Box<dyn Future<Output = Result<bool, Self::Error>> + Send + 'async_trait>>where
'life0: 'async_trait,
'life1: 'async_trait,
Self: Sync + 'async_trait,
fn exists<'life0, 'life1, 'async_trait>(
&'life0 self,
key: &'life1 [u8],
) -> Pin<Box<dyn Future<Output = Result<bool, Self::Error>> + Send + 'async_trait>>where
'life0: 'async_trait,
'life1: 'async_trait,
Self: Sync + 'async_trait,
Check if the key exists, not returning the value.
If the value is large, this method is more efficient than
get
.§fn delete<'life0, 'life1, 'async_trait>(
&'life0 self,
key: &'life1 [u8],
prev_kv: bool,
) -> Pin<Box<dyn Future<Output = Result<Option<KeyValue>, Self::Error>> + Send + 'async_trait>>where
'life0: 'async_trait,
'life1: 'async_trait,
Self: Sync + 'async_trait,
fn delete<'life0, 'life1, 'async_trait>(
&'life0 self,
key: &'life1 [u8],
prev_kv: bool,
) -> Pin<Box<dyn Future<Output = Result<Option<KeyValue>, Self::Error>> + Send + 'async_trait>>where
'life0: 'async_trait,
'life1: 'async_trait,
Self: Sync + 'async_trait,
Returns previous key-value pair if
prev_kv
is true
.source§impl KvCacheInvalidator for CachedMetaKvBackend
impl KvCacheInvalidator for CachedMetaKvBackend
source§impl TxnService for CachedMetaKvBackend
impl TxnService for CachedMetaKvBackend
Auto Trait Implementations§
impl !Freeze for CachedMetaKvBackend
impl !RefUnwindSafe for CachedMetaKvBackend
impl Send for CachedMetaKvBackend
impl Sync for CachedMetaKvBackend
impl Unpin for CachedMetaKvBackend
impl !UnwindSafe for CachedMetaKvBackend
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§impl<T> CacheInvalidator for Twhere
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