Trait MetadataFetch 

pub trait MetadataFetch:
    Debug
    + Send
    + Sync
    + 'static {
    // Required method
    fn fetch<'life0, 'async_trait>(
        &'life0 self,
        range: Range<u64>,
    ) -> Pin<Box<dyn Future<Output = AsyncTiffResult<Bytes>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait;
}

A data source that can be used with TiffMetadataReader and ImageFileDirectoryReader to load ImageFileDirectorys.

Note that implementation is provided for AsyncFileReader.

Required Methods

fn fetch<'life0, 'async_trait>( &'life0 self, range: Range<u64>, ) -> Pin<Box<dyn Future<Output = AsyncTiffResult<Bytes>> + Send + 'async_trait>>

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

Return a future that fetches the specified range of bytes asynchronously

Note the returned type is a boxed future, often created by futures::FutureExt::boxed. See the trait documentation for an example.

Implementors

impl<F: MetadataFetch + Send + Sync> MetadataFetch for ReadaheadMetadataCache<F>

impl<T: AsyncFileReader> MetadataFetch for T