pub(crate) struct ReadCache<C> {
file_cache: Arc<C>,
mem_cache: Cache<String, ReadResult>,
}
Expand description
Local read cache for files in object storage
Fields§
§file_cache: Arc<C>
Local file cache backend
mem_cache: Cache<String, ReadResult>
Local memory cache to track local cache files
Implementations§
Source§impl<C: Access> ReadCache<C>
impl<C: Access> ReadCache<C>
Sourcepub(crate) fn new(file_cache: Arc<C>, capacity: usize) -> Self
pub(crate) fn new(file_cache: Arc<C>, capacity: usize) -> Self
Create a ReadCache
with capacity in bytes.
Sourcepub(crate) async fn cache_stat(&self) -> (u64, u64)
pub(crate) async fn cache_stat(&self) -> (u64, u64)
Returns the cache’s entry count and total approximate entry size in bytes.
Sourcepub(crate) fn invalidate_entries_with_prefix(&self, path: &str)
pub(crate) fn invalidate_entries_with_prefix(&self, path: &str)
Invalidate all cache items belong to the specific path.
Sourcepub(crate) async fn recover_cache(&self) -> Result<(u64, u64)>
pub(crate) async fn recover_cache(&self) -> Result<(u64, u64)>
Recover existing cache items from file_cache
to mem_cache
.
Return entry count and total approximate entry size in bytes.
Sourcepub(crate) async fn contains_file(&self, path: &str) -> bool
pub(crate) async fn contains_file(&self, path: &str) -> bool
Returns true when the read cache contains the specific file.
Sourcepub(crate) async fn read_from_cache<I>(
&self,
inner: &I,
path: &str,
args: OpRead,
) -> Result<(RpRead, Reader)>where
I: Access,
pub(crate) async fn read_from_cache<I>(
&self,
inner: &I,
path: &str,
args: OpRead,
) -> Result<(RpRead, Reader)>where
I: Access,
Read from a specific path using the OpRead operation. It will attempt to retrieve the data from the local cache. If the data is not found in the local cache, it will fall back to retrieving it from remote object storage and cache the result locally.
async fn try_write_cache<I>(
&self,
reader: I::Reader,
read_key: &str,
) -> Result<usize>where
I: Access,
Sourceasync fn read_remote<I>(
&self,
inner: &I,
read_key: &str,
path: &str,
args: OpRead,
) -> Result<ReadResult>where
I: Access,
async fn read_remote<I>(
&self,
inner: &I,
read_key: &str,
path: &str,
args: OpRead,
) -> Result<ReadResult>where
I: Access,
Read the file from remote storage. If success, write the content into local cache.
Trait Implementations§
Auto Trait Implementations§
impl<C> Freeze for ReadCache<C>
impl<C> !RefUnwindSafe for ReadCache<C>
impl<C> Send for ReadCache<C>
impl<C> Sync for ReadCache<C>
impl<C> Unpin for ReadCache<C>
impl<C> !UnwindSafe for ReadCache<C>
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