Struct SledDbOverlayStateDiff 

pub struct SledDbOverlayStateDiff {
    pub initial_tree_names: Vec<IVec>,
    pub caches: BTreeMap<IVec, (SledTreeOverlayStateDiff, bool)>,
    pub dropped_trees: BTreeMap<IVec, (SledTreeOverlayStateDiff, bool)>,
}

Auxilliary struct representing a SledDbOverlayState diff log.

Fields

initial_tree_names: Vec<IVec>

Existing trees in db at the time of instantiation, so we can track newly opened trees.

caches: BTreeMap<IVec, (SledTreeOverlayStateDiff, bool)>

State diff logs of all SledTreeOverlay instances that have been created, along with a boolean flag indicating if it should be dropped. The drop flag is always set to false, and change to true when we inverse the diff of a new tree(not in our initial tree names) and the inserts vector is empty, indicating that the tree should be dropped.

dropped_trees: BTreeMap<IVec, (SledTreeOverlayStateDiff, bool)>

Trees that were dropped, along with their last state full diff, along with a boolean flag indicating if they should be restored. The restore flag is always set to false, and change to true when we inverse the diff, unless the tree is a new tree(not in our initial tree names).

Implementations

impl SledDbOverlayStateDiff

pub fn new(state: &SledDbOverlayState) -> Result<Self, Error>

Instantiate a new SledDbOverlayStateDiff, over the provided SledDbOverlayState. For newlly opened trees, all removed keys are ignored. New trees that get droped are also ignored.

pub fn inverse(&self) -> Self

Produces a SledDbOverlayStateDiff containing the inverse changes from our own.

pub fn remove_diff(&mut self, other: &Self)

Remove provided db overlay state changes from our own.

Trait Implementations

impl Clone for SledDbOverlayStateDiff

fn clone(&self) -> SledDbOverlayStateDiff

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SledDbOverlayStateDiff

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

Formats the value using the given formatter.

impl Default for SledDbOverlayStateDiff

fn default() -> SledDbOverlayStateDiff

Returns the “default value” for a type.

impl PartialEq for SledDbOverlayStateDiff

fn eq(&self, other: &SledDbOverlayStateDiff) -> 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 StructuralPartialEq for SledDbOverlayStateDiff