[−][src]Trait transact::state::Prune

pub trait Prune: Sync + Send + Clone {
type StateId;
type Key;
type Value;
    fn prune(
        &self, 
        state_ids: Vec<Self::StateId>
    ) -> Result<Vec<Self::Key>, StatePruneError>;
}

state::Prune provides a way to remove state ids from a particular state storage system.

Removing StateIds and the associated state makes it so the state storage system does not grow unbounded.

Associated Types

type StateId

A reference to a checkpoint in state. It could be a merkle hash for a merkle database.

type Key

The Key that is being stored in state.

type Value

The Value that is being stored in state.

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Required methods

fn prune(
    &self,
    state_ids: Vec<Self::StateId>
) -> Result<Vec<Self::Key>, StatePruneError>

Prune any State prior to the given StateId.

In storage mechanisms that have a concept of StateId ordering, this function should provide the functionality to prune older state values.

It can be considered a clean-up or space-saving mechanism.

It returns the keys that have been removed from state, if any.

Errors

StatePruneError is returned if any issues occur while trying to prune past results.

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Implementors

impl Prune for MerkleState[src]

type StateId = String

type Key = String

type Value = Vec<u8>

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