Struct FileStore 

pub struct FileStore<S> { /* private fields */ }

State held in one JSON document, so a second process — the next onevcs invocation — sees what the first one left.

Implementations

impl<S: Serialize + DeserializeOwned + Checked> FileStore<S>

pub fn attach(path: impl Into<PathBuf>, fallback: &S) -> Result<Self>

The store at path: whatever is already there, or fallback written out.

Attaching rather than replacing is what makes a second provider over the same path the same state — which is the whole reason to keep it in a file. A document that is there but is not this shape is refused here rather than at whichever call first read it.

pub fn replace(path: impl Into<PathBuf>, state: &S) -> Result<Self>

The store at path, holding this state whatever was there before.

Written eagerly rather than on first use: a journey that reads the document before anything has driven the provider must find the scenario it seeded.

pub fn path(&self) -> &Path

The document this state is kept in.

Trait Implementations

impl<S> Clone for FileStore<S>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<S: Debug> Debug for FileStore<S>

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

Formats the value using the given formatter.

impl<S: Serialize + DeserializeOwned + Checked> Store<S> for FileStore<S>

fn with<R, F>(&self, act: F) -> Result<R>

where F: FnOnce(&mut S) -> Result<R>,

Read the state, act on it, and keep whatever the action left.

fn snapshot(&self) -> Result<S>

The state as it stands.