Struct EmptyHandler 

pub struct EmptyHandler;

A handler that always fails with attribute / command not found.

Useful when chaining multiple handlers together as the end of the chain.

Implementations

impl EmptyHandler

pub const fn chain<M, H>( self, matcher: M, handler: H, ) -> ChainedHandler<M, H, EmptyHandler>

Chain the empty handler with another handler thus providing an “end of handler chain” fallback that errors out.

The returned chained handler works as follows:

• It will call the provided handler instance if the provided matcher returns true for the ReadContext/WriteContext/InvokeContext of the incoming operation
• Otherwise, the empty handler would be invoked, causing the operation to error out.

Arguments:

• matcher: A matcher that determines whether the handler should be invoked for the incoming operation.
• handler: The handler to be invoked if the matcher returns true.

Trait Implementations

impl AsyncHandler for EmptyHandler

fn read_awaits(&self, _ctx: impl ReadContext) -> bool

Provide information whether the handler will internally await while reading the current value of the provided attribute.

fn write_awaits(&self, _ctx: impl WriteContext) -> bool

Provide information whether the handler will internally await while updating the value of the provided attribute.

fn invoke_awaits(&self, _ctx: impl InvokeContext) -> bool

Provide information whether the handler will internally await while invoking the provided command.

fn read( &self, _ctx: impl ReadContext, _reply: impl ReadReply, ) -> impl Future<Output = Result<(), Error>>

Read from the requested attribute and encode the result using the provided reply type.

fn write( &self, _ctx: impl WriteContext, ) -> impl Future<Output = Result<(), Error>>

Write into the requested attribute using the provided data.

fn invoke( &self, _ctx: impl InvokeContext, _reply: impl InvokeReply, ) -> impl Future<Output = Result<(), Error>>

Invoke the requested command with the provided data and encode the result using the provided reply type.

fn bump_dataver(&self, _ctx: impl MatchContext)

Bump the per-cluster Dataver for the cluster handler matching the supplied context endpoint_id / cluster_id.

fn lifecycle( &self, _ctx: impl HandlerContext, _op: LifecycleOp, ) -> Result<(), Error>

Process a lifecycle operation (LifecycleOp).

fn run( &self, _ctx: impl HandlerContext, ) -> impl Future<Output = Result<(), Error>>

A hook (a scheduling facility) for placing handler-impl-specific code that needs to run asynchronously - forever and in the “background”.

impl Clone for EmptyHandler

fn clone(&self) -> EmptyHandler

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for EmptyHandler

impl Debug for EmptyHandler

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Eq for EmptyHandler

impl Handler for EmptyHandler

fn read( &self, _ctx: impl ReadContext, _reply: impl ReadReply, ) -> Result<(), Error>

Read from the requested attribute and encode the result using the provided reply type.

fn write(&self, _ctx: impl WriteContext) -> Result<(), Error>

Write into the requested attribute using the provided data.

fn invoke( &self, _ctx: impl InvokeContext, _reply: impl InvokeReply, ) -> Result<(), Error>

Invoke the requested command with the provided data and encode the result using the provided reply type.

fn bump_dataver(&self, _ctx: impl MatchContext)

Bump the per-cluster Dataver for the cluster handler matching the supplied context endpoint_id / cluster_id.

fn lifecycle( &self, _ctx: impl HandlerContext, _op: LifecycleOp, ) -> Result<(), Error>

Process a lifecycle operation (LifecycleOp).

fn run( &self, _ctx: impl HandlerContext, ) -> impl Future<Output = Result<(), Error>>

A hook (a scheduling facility) for placing handler-impl-specific code that needs to run asynchronously - forever and in the “background”.

impl Hash for EmptyHandler

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl NonBlockingHandler for EmptyHandler

impl PartialEq for EmptyHandler

fn eq(&self, other: &EmptyHandler) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for EmptyHandler