Enum MetaBackendOptions 

#[non_exhaustive]
pub enum MetaBackendOptions {
    Psql(PsqlMetaStorageOptions),
    Mem(MemMetaStorageOptions),
}

Selects and parameterizes the metadata storage backend.

This is the forward-looking, backend-agnostic way to say where the metadata lives. Each variant owns its backend’s full parameter set (e.g. Psql carries a PsqlMetaStorageOptions), so backend-specific knobs never leak into backend-agnostic options.

Build the selected backend into an AnyBackend with build, then hand it to Operon::new. To pin a backend at compile time, build its concrete options directly (e.g. PsqlMetaStorageOptions::build).

Stability

This enum is #[non_exhaustive]: adding a backend variant must stay a non-breaking change. Reach it through the provided constructors (e.g. psql) or a From conversion rather than naming variants directly.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Psql(PsqlMetaStorageOptions)

The Postgres backend and its configuration.

Mem(MemMetaStorageOptions)

The in-memory backend and its configuration.

Implementations

impl MetaBackendOptions

pub fn psql(uri: impl Into<String>) -> Self

Selects the Postgres backend with the given connection URI and default tuning.

For finer control, build a PsqlMetaStorageOptions and convert it with Into/From.

pub fn mem() -> Self

Selects the in-memory backend.

The metadata lives in process and is lost when it exits.

pub fn build(self) -> Result<AnyBackend, MetaStorageError<AnyBackendError>>

Builds the metadata backend selected by these options into an AnyBackend.

The concrete backend is resolved at runtime from the chosen variant. To pin a backend at compile time, build its concrete options instead (e.g. PsqlMetaStorageOptions::build).

Trait Implementations

impl Debug for MetaBackendOptions

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

Formats the value using the given formatter.

impl From<MemMetaStorageOptions> for MetaBackendOptions

fn from(options: MemMetaStorageOptions) -> Self

Converts to this type from the input type.

impl From<PsqlMetaStorageOptions> for MetaBackendOptions

fn from(options: PsqlMetaStorageOptions) -> Self

Converts to this type from the input type.