Struct holochain_state::prelude::DbRead
source · pub struct DbRead<Kind>where
Kind: DbKindT,{ /* private fields */ }
Expand description
A read-only version of DbWrite. This environment can only generate read-only transactions, never read-write.
Implementations§
source§impl<Kind> DbRead<Kind>where
Kind: DbKindT,
impl<Kind> DbRead<Kind>where Kind: DbKindT,
pub fn conn(&self) -> Result<PConn, DatabaseError>
pub async fn conn_permit(&self) -> impl Future<Output = PConnPermit>
pub async fn async_reader<E, R, F>( &self, f: F ) -> impl Future<Output = Result<R, E>>where E: From<DatabaseError> + Send + 'static, F: FnOnce(Transaction<'_>) -> Result<R, E> + Send + 'static, R: Send + 'static,
Trait Implementations§
source§impl<Kind> PermittedConn for DbRead<Kind>where
Kind: DbKindT,
impl<Kind> PermittedConn for DbRead<Kind>where Kind: DbKindT,
fn with_permit(&self, permit: PConnPermit) -> Result<PConnGuard, DatabaseError>
source§impl<Kind> ReadAccess<Kind> for DbRead<Kind>where
Kind: DbKindT,
impl<Kind> ReadAccess<Kind> for DbRead<Kind>where Kind: DbKindT,
source§fn async_reader<'life0, 'async_trait, E, R, F>(
&'life0 self,
f: F
) -> Pin<Box<dyn Future<Output = Result<R, E>> + Send + 'async_trait, Global>>where
'life0: 'async_trait,
E: From<DatabaseError> + Send + 'static + 'async_trait,
F: FnOnce(Transaction<'_>) -> Result<R, E> + Send + 'static + 'async_trait,
R: Send + 'static + 'async_trait,
DbRead<Kind>: 'async_trait,
fn async_reader<'life0, 'async_trait, E, R, F>( &'life0 self, f: F ) -> Pin<Box<dyn Future<Output = Result<R, E>> + Send + 'async_trait, Global>>where 'life0: 'async_trait, E: From<DatabaseError> + Send + 'static + 'async_trait, F: FnOnce(Transaction<'_>) -> Result<R, E> + Send + 'static + 'async_trait, R: Send + 'static + 'async_trait, DbRead<Kind>: 'async_trait,
Run an async read transaction on a background thread.
source§fn sync_reader<E, R, F>(&self, f: F) -> Result<R, E>where
E: From<DatabaseError>,
F: FnOnce(Transaction<'_>) -> Result<R, E>,
fn sync_reader<E, R, F>(&self, f: F) -> Result<R, E>where E: From<DatabaseError>, F: FnOnce(Transaction<'_>) -> Result<R, E>,
Run an sync read transaction on a the current thread.
Auto Trait Implementations§
impl<Kind> !RefUnwindSafe for DbRead<Kind>
impl<Kind> Send for DbRead<Kind>
impl<Kind> Sync for DbRead<Kind>
impl<Kind> Unpin for DbRead<Kind>where Kind: Unpin,
impl<Kind> !UnwindSafe for DbRead<Kind>
Blanket Implementations§
§impl<T> ArchivePointee for T
impl<T> ArchivePointee for T
§type ArchivedMetadata = ()
type ArchivedMetadata = ()
The archived version of the pointer metadata for this type.
§fn pointer_metadata(
_: &<T as ArchivePointee>::ArchivedMetadata
) -> <T as Pointee>::Metadata
fn pointer_metadata( _: &<T as ArchivePointee>::ArchivedMetadata ) -> <T as Pointee>::Metadata
Converts some archived metadata to the pointer metadata for itself.
§impl<F, W, T, D> Deserialize<With<T, W>, D> for Fwhere
W: DeserializeWith<F, T, D>,
D: Fallible + ?Sized,
F: ?Sized,
impl<F, W, T, D> Deserialize<With<T, W>, D> for Fwhere W: DeserializeWith<F, T, D>, D: Fallible + ?Sized, F: ?Sized,
§fn deserialize(
&self,
deserializer: &mut D
) -> Result<With<T, W>, <D as Fallible>::Error>
fn deserialize( &self, deserializer: &mut D ) -> Result<With<T, W>, <D as Fallible>::Error>
Deserializes using the given deserializer
source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
§impl<T> Pointable for T
impl<T> Pointable for T
§impl<SS, SP> SupersetOf<SS> for SPwhere
SS: SubsetOf<SP>,
impl<SS, SP> SupersetOf<SS> for SPwhere SS: SubsetOf<SP>,
§fn to_subset(&self) -> Option<SS>
fn to_subset(&self) -> Option<SS>
The inverse inclusion map: attempts to construct
self
from the equivalent element of its
superset. Read more§fn is_in_subset(&self) -> bool
fn is_in_subset(&self) -> bool
Checks if
self
is actually part of its subset T
(and can be converted to it).§fn to_subset_unchecked(&self) -> SS
fn to_subset_unchecked(&self) -> SS
Use with care! Same as
self.to_subset
but without any property checks. Always succeeds.§fn from_subset(element: &SS) -> SP
fn from_subset(element: &SS) -> SP
The inclusion map: converts
self
to the equivalent element of its superset.§impl<T> Upcastable for Twhere
T: Any + Send + Sync + 'static,
impl<T> Upcastable for Twhere T: Any + Send + Sync + 'static,
§fn upcast_any_ref(&self) -> &(dyn Any + 'static)
fn upcast_any_ref(&self) -> &(dyn Any + 'static)
upcast ref
§fn upcast_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn upcast_any_mut(&mut self) -> &mut (dyn Any + 'static)
upcast mut ref