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) -> PConnPermit
pub async fn async_reader<E, R, F>(&self, f: F) -> Result<R, E>
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>>
fn async_reader<'life0, 'async_trait, E, R, F>( &'life0 self, f: F ) -> Pin<Box<dyn Future<Output = Result<R, E>> + Send + 'async_trait>>
Run an async read transaction on a background thread.
source§fn sync_reader<E, R, F>(&self, f: F) -> Result<R, E>
fn sync_reader<E, R, F>(&self, f: F) -> 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> Any for T
impl<T> Any for T
§fn type_id_compat(&self) -> TypeId
fn type_id_compat(&self) -> TypeId
TODO: once 1.33.0 is the minimum supported compiler version, remove
Any::type_id_compat and use StdAny::type_id instead.
https://github.com/rust-lang/rust/issues/27745
§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.
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
§impl<F, W, T, D> Deserialize<With<T, W>, D> for F
impl<F, W, T, D> Deserialize<With<T, W>, D> for F
§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
§impl<T> FutureExt for T
impl<T> FutureExt for T
§fn with_context(self, otel_cx: Context) -> WithContext<Self>
fn with_context(self, otel_cx: Context) -> WithContext<Self>
§fn with_current_context(self) -> WithContext<Self>
fn with_current_context(self) -> WithContext<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>
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 T
impl<T> Upcastable for T
§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
§fn upcast_any_box(self: Box<T>) -> Box<dyn Any>
fn upcast_any_box(self: Box<T>) -> Box<dyn Any>
upcast boxed dyn