Struct flatdata::TarArchiveResourceStorage

pub struct TarArchiveResourceStorage { /* fields omitted */ }

Read-only resource storage on disk using a memory mapped tar archive.

Used to read flatdata archives from a tar archive on disk.

Examples

use flatdata::{TarArchiveResourceStorage, Vector};
use flatdata::test::X;

let storage = TarArchiveResourceStorage::new("/root/to/my/archive.tar")
    .expect("failed to read tar archive");
let archive = X::open(storage).expect("failed to open");
// read data
archive.data();

Implementations

impl TarArchiveResourceStorage

pub fn new<P: Into<PathBuf>>(tar_path: P) -> Result<Arc<Self>, Error>

Create a memory mapped tar archive resource storage for a tar archive at a given path.

Trait Implementations

impl Debug for TarArchiveResourceStorage

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

Formats the value using the given formatter.

impl ResourceStorage for TarArchiveResourceStorage

fn subdir(&self, dir: &str) -> StorageHandle

Creates a resource storage at a given subdirectory.

fn exists(&self, resource_name: &str) -> bool

Returns true if resource exists in the storage.

fn read_resource(&self, resource_name: &str) -> Result<&[u8], Error>

Reads a resource in storage and returns a pointer to its raw data.

fn create_output_stream(
    &self,
    _resource_name: &str
) -> Result<Box<dyn Stream>, Error>

Creates a resource with given name and returns an output stream for writing to it.

fn read(
    &self,
    resource_name: &str,
    schema: &str
) -> Result<&[u8], ResourceStorageError>

Open a flatdata resource with given name and schema for reading.

fn write(&self, resource_name: &str, schema: &str, data: &[u8]) -> Result<()>

Writes data of a flatdata resource with given name and schema to storage.

fn read_and_check_schema(
    &self,
    resource_name: &str,
    expected_schema: &str
) -> Result<&[u8], ResourceStorageError>

Implementation helper for read.