Struct EventApplier

pub struct EventApplier<'a> { /* private fields */ }

A helper-struct that apples an event.

It’s main function is to unwind the log of events, apply the new event (it might have occurred before any of the other events) and then apply the unwound events.

Implementations

impl<'a> EventApplier<'a>

pub fn resource(&self) -> Option<&str>

The name of the modified resource on the local store. If this is None, the resource this event applies to has been deleted since. Don’t call Self::apply if that’s the case.

pub fn event(&self) -> &Event

Get a reference to the event to be applied.

pub fn apply( &mut self, resource: impl Into<Vec<u8>>, ) -> Result<Vec<u8>, (ApplyError, Vec<u8>)>

Must only be called if Self::event is EventKind::Modify & Self::resource returns Some, as you know which resource to load. If the target resource doesn’t exist, don’t call this.

Errors

If a ApplyError::RefOutOfBounds error occurs, the apply action is completed and the error and the applied data is returned.

Returns ApplyError::InvalidEvent if this EventApplier wasn’t instantiated with a EventKind::Modify.

Returns a ApplyError::RefOutOfBounds if the difference of this event is out of bounds.

Trait Implementations

impl<'a> Debug for EventApplier<'a>

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

Formats the value using the given formatter.