Module segments 

Segment access abstractions for layouts.

Layouts refer to byte ranges by SegmentId. A SegmentSource resolves those ids to buffer handles for readers, while a SegmentSink assigns ids when writers emit buffers. SegmentCache implementations can sit in front of sources to reuse segment bytes across scans.

Structs

FileSegmentCache

One file’s view of a MokaSegmentCache; see MokaSegmentCache::for_file.

InstrumentedSegmentCache

Wrapper for SegmentCache that tracks its hit rate.

MokaSegmentCache

An in-memory Moka cache of segments, capped by total buffer bytes, that any number of files can share.

NoOpSegmentCache

Segment cache implementation that never stores anything.

SegmentCacheSourceAdapter

SegmentSource wrapper that consults a SegmentCache before the underlying source.

SegmentId

Identifier for a single physical segment referenced by a layout.

SegmentSourceId

Identifies the contents of one segment source, usually a file, in a cache that many sources share.

SharedSegmentSource

A SegmentSource that allows multiple requesters to await the same underlying segment request.

TestSegments

A dummy in-memory implementation of a segment reader and writer.

Enums

SegmentEviction

Which segments a MokaSegmentCache evicts when it is full.

Traits

SegmentCache

Cache for individual segment byte buffers.

SegmentSink

Assigns segment ids and writes segment buffers during layout writing.

SegmentSource

Provides segment data to a crate::LayoutReader.

Type Aliases

SegmentFuture

Static future resolving to a segment byte buffer.

SegmentSinkRef

Shared writer-side segment sink.