Struct agde::event::Unwinder

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

Unwinds the stack of stored events to get the local data to a previous state.

Has nothing to do with unwinding of the program’s stack in a panic!.

Implementations

impl<'a> Unwinder<'a>

pub fn sections<'b>( &'b self, modern_resource_name: &'b str ) -> Option<impl Iterator<Item = &Difference> + 'b>

Get an iterator over the Differences to modern_resource_name.

Returns None if modern_resource_name was destroyed/created during the events we’re tracking.

pub fn events(&self) -> impl Iterator<Item = &Event> + DoubleEndedIterator + '_

Get an iterator over the events stored in this unwinder. The first item is the oldest one. The last is the most recent.

Useful it you want to get resources affected since a timestamp:

use std::time::{Duration, SystemTime};
let manager = Manager::new(false, 0, Duration::from_secs(60), 512);

let unwinder = manager.unwinder_to(SystemTime::now() - Duration::from_secs(2));
for event in unwinder.events() {
    println!("Resource {} changed in some way.", event.resource());
}

pub fn unwind( &mut self, resource: impl Into<Vec<u8>>, modern_resource_name: &str ) -> Result<Vec<u8>, UnwindError>

Reverts the resource with modern_resource_name to the bottom of the internal list.

Panics

If you called this before and didn’t call Self::unwind, this panics.

Errors

Returns UnwindError::ResourceDestroyed if modern_resource_name has been re-created or destroyed during the timeline of this unwinder.

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

Rewinds the resource back up.

Errors

Passes errors from Difference::apply.

pub fn last_change_to_resource(&self, resource: &str) -> SystemTime

See Manager::last_change_to_resource.

Trait Implementations

impl<'a> Clone for Unwinder<'a>

fn clone(&self) -> Unwinder<'a>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Unwinder<'a>

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

Formats the value using the given formatter.