FileRead

vortex_io::file

Struct FileRead 

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pub struct FileRead { /* private fields */ }
Expand description

A handle to an open file that can be read using a Vortex runtime.

§Coalescing and Pre-fetching

It is important to understand the semantics of the read futures returned by a FileRead. Under the hood, each FileRead is backed by a stream that services read requests by applying coalescing and concurrency constraints.

Each read future has four states:

  • registered - the read future has been created, but not yet polled.
  • requested - the read future has been polled.
  • in-flight - the read request has been sent to the underlying storage system.
  • resolved - the read future has completed and resolved a result.

When a read request is registered, it will not itself trigger any I/O, but is eligible to be coalesced with other requests.

If a read future is dropped, it will be canceled if possible. This depends on the current state of the request, as well as whether the underlying storage system supports cancellation.

I/O requests will be processed in the order they are registered, however coalescing may mean other registered requests are lumped together into a single I/O operation.

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impl FileRead

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pub fn uri(&self) -> &Arc<str>

The URI of the file.

Trait Implementations§

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impl Clone for FileRead

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fn clone(&self) -> FileRead

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for FileRead

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

Formats the value using the given formatter. Read more
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impl Display for FileRead

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

Formats the value using the given formatter. Read more
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impl VortexReadAt for FileRead

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fn read_at( &self, offset: u64, length: usize, alignment: Alignment, ) -> BoxFuture<'static, VortexResult<ByteBuffer>>

Request an asynchronous positional read. Results will be returned as a ByteBuffer. Read more
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fn size(&self) -> BoxFuture<'static, VortexResult<u64>>

Asynchronously get the number of bytes of the underlying file.
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fn performance_hint(&self) -> PerformanceHint

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