pub struct CombinedStoreBackend { /* private fields */ }Expand description
combines multiple store backends by falling back to the next one if the current one fails.
Queries try connected backends in order.
Implementations§
Source§impl CombinedStoreBackend
impl CombinedStoreBackend
pub fn new(backends: Vec<Box<dyn StoreBackend>>) -> Self
pub fn for_correctness(force_correctness: bool) -> Self
Sourcepub fn default_fast() -> Self
pub fn default_fast() -> Self
Returns a backend that is focused on performance and availability.
This first tries the regular sqlite database, then falls back to opening
it with immutable=1, and finally falls back to Nix commands.
Sourcepub fn default_correct() -> Self
pub fn default_correct() -> Self
Returns a backend that is focused solely on absolutely guaranteeing correct results if the regular sqlite database cannot be opened.
Note that DATABASE_PATH_IMMUTABLE is not used here, since opening
the database can lead to undefined results (also silently with no errors)
if the database is actually modified while opened.
Trait Implementations§
Source§impl Default for CombinedStoreBackend
impl Default for CombinedStoreBackend
Source§impl Display for CombinedStoreBackend
impl Display for CombinedStoreBackend
Source§impl StoreBackend for CombinedStoreBackend
impl StoreBackend for CombinedStoreBackend
Source§fn connect(&mut self) -> Result<()>
fn connect(&mut self) -> Result<()>
connects to all backends. Returns an error if all backends fail
Source§fn close(&mut self) -> Result<()>
fn close(&mut self) -> Result<()>
Closes all connected backends.
If some fail to close, the combined error is returned.
Source§fn query_system_derivations(&self, system: &Path) -> Result<Vec<StorePath>>
fn query_system_derivations(&self, system: &Path) -> Result<Vec<StorePath>>
Source§fn query_dependents(&self, path: &Path) -> Result<Vec<StorePath>>
fn query_dependents(&self, path: &Path) -> Result<Vec<StorePath>>
Source§fn query_closure_path_info(&self, path: &Path) -> Result<Vec<StorePathInfo>>
fn query_closure_path_info(&self, path: &Path) -> Result<Vec<StorePathInfo>>
Auto Trait Implementations§
impl !RefUnwindSafe for CombinedStoreBackend
impl !Send for CombinedStoreBackend
impl !Sync for CombinedStoreBackend
impl !UnwindSafe for CombinedStoreBackend
impl Freeze for CombinedStoreBackend
impl Unpin for CombinedStoreBackend
impl UnsafeUnpin for CombinedStoreBackend
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