Struct Noop 

pub struct Noop;

A no-op RuntimeKit implementation that never actually executes tasks or I/O

spawn and spawn_blocking drop the work they are handed and return a task which never completes, so anything built on them never resolves either: awaiting the result of Runtime::to_socket_addrs on a NoopRuntime waits forever, and parked rather than spinning, since that is what simple_block_on does with a future which never wakes.

The Reactor side resolves under any executor, not just Executor::block_on, but only as far as handing something back: sleep completes immediately, and tcp_connect_addr hands over a DummyIO without having connected to anything. Using it is where the waiting starts again — every read, write, flush and close on a DummyIO, and every item of the stream interval returns, is Poll::Pending forever, and no waker is ever registered, so the executor cannot even be woken to cancel the task waiting on one.

register is the one to watch: it takes the socket by value and drops it, closing the descriptor, and hands back a DummyIO in its place. Dropping a NoopRuntime into a test harness therefore loses the socket, silently.

Trait Implementations

impl Clone for Noop

fn clone(&self) -> Noop

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Noop

impl Debug for Noop

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

Formats the value using the given formatter.

impl Default for Noop

fn default() -> Noop

Returns the “default value” for a type.

impl Eq for Noop

impl Executor for Noop

type Task<T: Send + 'static> = NTask<T>

The type representing the tasks the are returned when spawning a Future on the executor

fn block_on<T, F: Future<Output = T>>(&self, f: F) -> T

Block on a future until completion

fn spawn<T: Send + 'static, F: Future<Output = T> + Send + 'static>( &self, _f: F, ) -> Task<Self::Task<T>>

Spawn a future and return a handle to track its completion.

fn spawn_blocking<T: Send + 'static, F: FnOnce() -> T + Send + 'static>( &self, _f: F, ) -> Task<Self::Task<T>>

Convert a blocking task into a future, spawning it on a dedicated thread pool

impl Ord for Noop

fn cmp(&self, other: &Noop) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Noop

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Noop

fn partial_cmp(&self, other: &Noop) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Reactor for Noop

type TcpStream = DummyIO

The type representing a TCP stream (after tcp_connect) for this reactor

type Sleep = Ready<()>

A future that completes after a requested duration has elapsed (see Reactor::sleep)

fn register<H: Read + Write + AsSysFd + Send + 'static>( &self, _socket: H, ) -> Result<impl AsyncRead + AsyncWrite + Send + Unpin + 'static>

Register a synchronous handle, returning an asynchronous one

fn sleep(&self, _dur: Duration) -> Self::Sleep

Sleep for the given duration

fn interval( &self, _dur: Duration, ) -> impl Stream<Item = Instant> + Send + 'static

Stream that yields at every given interval

fn tcp_connect_addr( &self, _addr: SocketAddr, ) -> impl Future<Output = Result<Self::TcpStream>> + Send + 'static

Create a TcpStream by connecting to a specific pre-resolved address

fn tcp_connect<A: AsyncToSocketAddrs + Send>( &self, addrs: A, ) -> impl Future<Output = Result<Self::TcpStream>> + Send

where Self: Sync + Sized,

Create a TcpStream by connecting to a remote host

impl RuntimeKit for Noop

impl StructuralPartialEq for Noop