Struct QuerySubscriptions 

pub struct QuerySubscriptions { /* private fields */ }

The query subscriptions of one UI session.

Implementations

impl QuerySubscriptions

pub fn new() -> Self

pub fn open( &mut self, window: impl Into<String>, query: usize, reads: Vec<usize>, ) -> u64

Start a subscription to query for window. Nothing is requested until request names the parameters.

pub fn get(&self, id: u64) -> Option<&QuerySubscription>

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn request(&mut self, id: u64, params: Vec<Value>) -> Option<Ticket>

Request new parameters; the previous request is cancelled. None when the subscription has ended.

pub fn resolve( &mut self, id: u64, ticket: &Ticket, result: Result<Value, CommandError>, ) -> Resolution

Apply an answer if it is still current.

pub fn close(&mut self, id: u64) -> bool

End a subscription; its request in flight is cancelled.

pub fn close_window(&mut self, window: &str) -> Vec<u64>

End every subscription of a closed window instance.

pub fn refresh(&mut self, changed: &[usize]) -> Vec<(u64, Ticket, Vec<Value>)>

Engine state fields changed: every requested subscription whose query reads one of them is requested again with its parameters. Returns what to send to the provider.

Trait Implementations

impl Debug for QuerySubscriptions

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

Formats the value using the given formatter.

impl Default for QuerySubscriptions

fn default() -> Self

Returns the “default value” for a type.