Struct ra_ap_hir::db::EnumDataQuery
source · pub struct EnumDataQuery;
Implementations§
source§impl EnumDataQuery
impl EnumDataQuery
sourcepub fn in_db(self, db: &dyn DefDatabase) -> QueryTable<'_, EnumDataQuery>
pub fn in_db(self, db: &dyn DefDatabase) -> QueryTable<'_, EnumDataQuery>
Get access to extra methods pertaining to this query. You can also use it to invoke this query.
source§impl EnumDataQuery
impl EnumDataQuery
sourcepub fn in_db_mut(
self,
db: &mut dyn DefDatabase
) -> QueryTableMut<'_, EnumDataQuery>
pub fn in_db_mut( self, db: &mut dyn DefDatabase ) -> QueryTableMut<'_, EnumDataQuery>
Like in_db
, but gives access to methods for setting the
value of an input. Not applicable to derived queries.
§Threads, cancellation, and blocking
Mutating the value of a query cannot be done while there are
still other queries executing. If you are using your database
within a single thread, this is not a problem: you only have
&self
access to the database, but this method requires &mut self
.
However, if you have used snapshot
to create other threads,
then attempts to set
will block the current thread until
those snapshots are dropped (usually when those threads
complete). This also implies that if you create a snapshot but
do not send it to another thread, then invoking set
will
deadlock.
Before blocking, the thread that is attempting to set
will
also set a cancellation flag. This will cause any query
invocations in other threads to unwind with a Cancelled
sentinel value and eventually let the set
succeed once all
threads have unwound past the salsa invocation.
If your query implementations are performing expensive
operations without invoking another query, you can also use
the Runtime::unwind_if_cancelled
method to check for an
ongoing cancellation and bring those operations to a close,
thus allowing the set
to succeed. Otherwise, long-running
computations may lead to “starvation”, meaning that the
thread attempting to set
has to wait a long, long time. =)
Trait Implementations§
source§impl Debug for EnumDataQuery
impl Debug for EnumDataQuery
source§impl Default for EnumDataQuery
impl Default for EnumDataQuery
source§fn default() -> EnumDataQuery
fn default() -> EnumDataQuery
source§impl Query for EnumDataQuery
impl Query for EnumDataQuery
§type Key = EnumId
type Key = EnumId
§type Storage = DerivedStorage<EnumDataQuery, AlwaysMemoizeValue>
type Storage = DerivedStorage<EnumDataQuery, AlwaysMemoizeValue>
source§const QUERY_INDEX: u16 = 8u16
const QUERY_INDEX: u16 = 8u16
source§const QUERY_NAME: &'static str = "enum_data"
const QUERY_NAME: &'static str = "enum_data"
foo
)source§fn query_storage<'a>(
group_storage: &'a <EnumDataQuery as QueryDb<'_>>::GroupStorage
) -> &'a Arc<<EnumDataQuery as Query>::Storage>
fn query_storage<'a>( group_storage: &'a <EnumDataQuery as QueryDb<'_>>::GroupStorage ) -> &'a Arc<<EnumDataQuery as Query>::Storage>
source§fn query_storage_mut<'a>(
group_storage: &'a <EnumDataQuery as QueryDb<'_>>::GroupStorage
) -> &'a Arc<<EnumDataQuery as Query>::Storage>
fn query_storage_mut<'a>( group_storage: &'a <EnumDataQuery as QueryDb<'_>>::GroupStorage ) -> &'a Arc<<EnumDataQuery as Query>::Storage>
source§impl<'d> QueryDb<'d> for EnumDataQuery
impl<'d> QueryDb<'d> for EnumDataQuery
§type DynDb = dyn DefDatabase + 'd
type DynDb = dyn DefDatabase + 'd
§type Group = DefDatabaseStorage
type Group = DefDatabaseStorage
§type GroupStorage = DefDatabaseGroupStorage__
type GroupStorage = DefDatabaseGroupStorage__
Auto Trait Implementations§
impl Freeze for EnumDataQuery
impl RefUnwindSafe for EnumDataQuery
impl Send for EnumDataQuery
impl Sync for EnumDataQuery
impl Unpin for EnumDataQuery
impl UnwindSafe for EnumDataQuery
Blanket Implementations§
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
source§impl<T> Cast for T
impl<T> Cast for T
source§fn cast<U>(self, interner: <U as HasInterner>::Interner) -> Uwhere
Self: CastTo<U>,
U: HasInterner,
fn cast<U>(self, interner: <U as HasInterner>::Interner) -> Uwhere
Self: CastTo<U>,
U: HasInterner,
U
using CastTo
.