Struct tikv::storage::txn::commands::TypedCommand[−][src]

pub struct TypedCommand<T> {
    pub cmd: Command,
    _pd: PhantomData<T>,
}

A Command with its return type, reified as the generic parameter T.

Incoming grpc requests (like CommitRequest, PrewriteRequest) are converted to this type via a series of transformations. That process is described below using CommitRequest as an example:

A CommitRequest is handled by the future_commit method in kv.rs, where it needs to be transformed to a TypedCommand before being passed to the storage.sched_txn_command method.
The From<CommitRequest> impl for TypedCommand gets chosen, and its generic parameter indicates that the result type for this instance of TypedCommand is going to be TxnStatus - one of the variants of the StorageCallback enum.
In the above from method, the details of the commit request are captured by creating an instance of the struct storage::txn::commands::commit::Command via its new method.
This struct is wrapped in a variant of the enum storage::txn::commands::Command. This enum exists to facilitate generic operations over different commands.
Finally, the Command enum variant for Commit is converted to the TypedCommand using the From<Command> impl for TypedCommand.

For other requests, see the corresponding future_ method, the From trait implementation and so on.

Fields

cmd: Command_pd: PhantomData<T>

Track the type of the command’s return value.

Trait Implementations

`impl From<BatchRollbackRequest> for TypedCommand<()>`[src]

`fn from(req: BatchRollbackRequest) -> Self`[src]

`impl From<CheckSecondaryLocksRequest> for TypedCommand<SecondaryLocksStatus>`[src]

`fn from(req: CheckSecondaryLocksRequest) -> Self`[src]

`impl From<CheckTxnStatusRequest> for TypedCommand<TxnStatus>`[src]

`fn from(req: CheckTxnStatusRequest) -> Self`[src]

`impl From<CleanupRequest> for TypedCommand<()>`[src]

`fn from(req: CleanupRequest) -> Self`[src]

`impl<T: StorageCallbackType> From<Command> for TypedCommand<T>`[src]

`fn from(cmd: Command) -> TypedCommand<T>`[src]

`impl From<CommitRequest> for TypedCommand<TxnStatus>`[src]

`fn from(req: CommitRequest) -> Self`[src]

`impl From<MvccGetByKeyRequest> for TypedCommand<MvccInfo>`[src]

`fn from(req: MvccGetByKeyRequest) -> Self`[src]

`impl From<MvccGetByStartTsRequest> for TypedCommand<Option<(Key, MvccInfo)>>`[src]

`fn from(req: MvccGetByStartTsRequest) -> Self`[src]

`impl From<PessimisticLockRequest> for TypedCommand<StorageResult<PessimisticLockRes>>`[src]

`fn from(req: PessimisticLockRequest) -> Self`[src]

`impl From<PessimisticRollbackRequest> for TypedCommand<Vec<StorageResult<()>>>`[src]

`fn from(req: PessimisticRollbackRequest) -> Self`[src]

`impl From<PrewriteRequest> for TypedCommand<PrewriteResult>`[src]

`fn from(req: PrewriteRequest) -> Self`[src]

`impl From<ResolveLockRequest> for TypedCommand<()>`[src]

`fn from(req: ResolveLockRequest) -> Self`[src]

`impl From<TxnHeartBeatRequest> for TypedCommand<TxnStatus>`[src]

`fn from(req: TxnHeartBeatRequest) -> Self`[src]

`impl<T> From<TypedCommand<T>> for Command`[src]

`fn from(t: TypedCommand<T>) -> Command`[src]

Auto Trait Implementations

`impl<T> RefUnwindSafe for TypedCommand<T> where T: RefUnwindSafe,`

`impl<T> Send for TypedCommand<T> where T: Send,`

`impl<T> Sync for TypedCommand<T> where T: Sync,`

`impl<T> Unpin for TypedCommand<T> where T: Unpin,`

`impl<T> UnwindSafe for TypedCommand<T> where T: UnwindSafe,`

Blanket Implementations

`impl<T> Any for T where T: 'static + ?Sized,` [src]

`pub fn type_id(&self) -> TypeId`[src]

`impl<T> Borrow<T> for T where T: ?Sized,` [src]

`pub fn borrow(&self) -> &T`[src]

`impl<T> BorrowMut<T> for T where T: ?Sized,` [src]

`pub fn borrow_mut(&mut self) -> &mut T`[src]

`impl<V, W> ConvertFrom<W> for V where W: ConvertTo<V>,` [src]

`pub fn convert_from(ctx: &mut EvalContext, from: W) -> Result<V, Error>`[src]

`impl<T> From<T> for T`[src]

`pub fn from(t: T) -> T`[src]

`impl<T> Instrument for T`[src]

`pub fn instrument(self, span: Span) -> Instrumented<Self>`[src]

`pub fn in_current_span(self) -> Instrumented<Self>`[src]

`impl<T, U> Into<U> for T where U: From<T>,` [src]

`pub fn into(self) -> U`[src]

`impl<T> Pointable for T`[src]

`pub const ALIGN: usize`[src]

`type Init = T`

The type for initializers.

`pub unsafe fn init(init: <T as Pointable>::Init) -> usize`[src]

`pub unsafe fn deref<'a>(ptr: usize) -> &'a T`[src]

`pub unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T`[src]

`pub unsafe fn drop(ptr: usize)`[src]

`impl<T> Pointable for T`[src]

`pub const ALIGN: usize`[src]

`type Init = T`

The type for initializers.

`pub unsafe fn init(init: <T as Pointable>::Init) -> usize`[src]

`pub unsafe fn deref<'a>(ptr: usize) -> &'a T`[src]

`pub unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T`[src]

`pub unsafe fn drop(ptr: usize)`[src]

`impl<T> Same<T> for T`[src]

`type Output = T`

Should always be Self

`impl<T> Sealed<T> for T where T: ?Sized,` [src]

`impl<T> SendSyncUnwindSafe for T where T: Send + Sync + UnwindSafe + ?Sized,` [src]

`impl<T, U> TryFrom<U> for T where U: Into<T>,` [src]

`type Error = Infallible`

The type returned in the event of a conversion error.

`pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`[src]

`impl<T, U> TryInto<U> for T where U: TryFrom<T>,` [src]

`type Error = <U as TryFrom<T>>::Error`

The type returned in the event of a conversion error.

`pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`[src]

`impl<V, T> VZip<V> for T where V: MultiLane<T>,` [src]

`pub fn vzip(self) -> V`[src]