Struct spirit::fragment::driver::SilentOnceDriver

pub struct SilentOnceDriver { /* fields omitted */ }

A driver that initializes just once, but unlike OnceDriver is silent about changed configurations.

This may be used for early but incomplete initialization of some global resource. It would then be paired with a pipeline doing a full load later in the chain (one such example might be initializing logging but without the background thread before daemonization, and doing full logging with background thread afterwards).

See the example in the daemonization chapter.

Trait Implementations

impl Default for SilentOnceDriver

fn default() -> Self

Returns the “default value” for a type.

impl<F> Driver<F> for SilentOnceDriver where
    F: Fragment, 

type SubFragment = F

The smaller Fragment the driver cuts F into.

fn instructions<T, I>(
    &mut self,
    fragment: &F,
    transform: &mut T,
    name: &'static str
) -> Result<Vec<Instruction<T::OutputResource>>, Vec<AnyError>> where
    T: Transformation<<Self::SubFragment as Fragment>::Resource, I, Self::SubFragment>, 

Issues the instructions how to transition to the new fragment.

fn confirm(&mut self, _name: &'static str)

Call to this method informs the Driver that the instructions returned by the last call to instructions were followed and the changes have taken place.

fn abort(&mut self, _name: &'static str)

Call to this method informs the Driver that the instructions returned by the last call to instructions were not followed and were dropped.

fn maybe_cached(&self, _: &F, _name: &'static str) -> bool

Informs if there’s a chance the new fragment will use something in the Driver’s cache if applied.