Struct FileNotificationForwarderPersistence 

pub struct FileNotificationForwarderPersistence { /* private fields */ }

A file holding one forwarder’s lists, replaced whole on each save.

A save writes a sibling .tmp file, synchronizes it, renames it over the old one and then synchronizes the directory, so a failed save leaves the previous lists in place and a completed one survives a power loss. Once the rename succeeds the save has landed: a directory sync that fails is logged, not returned. (On Windows the directory is not synchronized: see the durable module.) The file holds a magic tag, the forwarder’s object identifier, whether a Recipient_List follows, the encoded Recipient_List with its length, and the encoded Subscribed_Recipients. It does not coordinate between processes.

Implementations

impl FileNotificationForwarderPersistence

pub fn new(path: impl AsRef<Path>) -> Result<Self, Error>

Keep the lists in the file at path.

pub fn path(&self) -> &Path

The file the lists are kept in.

Trait Implementations

impl Clone for FileNotificationForwarderPersistence

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for FileNotificationForwarderPersistence

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

Formats the value using the given formatter.

impl NotificationForwarderPersistence for FileNotificationForwarderPersistence

fn load( &self, forwarder: ObjectIdentifier, ) -> Result<Option<ForwarderSnapshot>, Error>

The lists last saved for forwarder, or None when nothing was saved.

fn save( &self, forwarder: ObjectIdentifier, snapshot: &ForwarderSnapshot, ) -> Result<(), Error>

Durably replace what is saved for forwarder with snapshot.