Struct Placement 

pub struct Placement { /* private fields */ }

Where each node runs. The ones not listed run wherever they land.

Implementations

impl Placement

pub fn new() -> Self

Nothing placed.

pub fn place(&mut self, id: impl Into<NodeId>, device: Device) -> Option<Device>

Places a node on a device, returning where it was before.

pub fn place_at(&mut self, id: impl Into<NodeId>, host: Host) -> Option<Host>

Sends a node to a host, returning which one it was on before. Independent of place.

pub fn of(&self, id: &NodeId) -> Option<&Device>

Which device this node runs on, if it was said. None is “wherever it already is”, not cpu.

pub fn host_of(&self, id: &NodeId) -> Option<&Host>

Which host this node runs on, if it was said. None is here.

pub fn hosts(&self) -> Vec<&Host>

Every host this placement names, once each, in a fixed order.

The half of host_of that reads the other way, for the client that talks to a broker and so does not already know the names. Once each, because a host named by ten nodes is one rendezvous. Sorted, because these come out of a HashMap and an irreproducible order would make the order failures happen in irreproducible too.

pub fn len(&self) -> usize

How many nodes have something said about them: device, host or both.

pub fn is_empty(&self) -> bool

Whether nothing has been said about any node.

pub fn is_local(&self) -> bool

Whether no node has been sent to any host, which is what allows skipping distribute.

Trait Implementations

impl Clone for Placement

fn clone(&self) -> Placement

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Placement

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

Formats the value using the given formatter.

impl Default for Placement

fn default() -> Placement

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Placement

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Placement

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Placement

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for Placement

impl StructuralPartialEq for Placement