Struct mz_storage_controller::history::CommandHistory

pub(crate) struct CommandHistory<T> {
    reduced_count: usize,
    commands: Vec<StorageCommand<T>>,
    metrics: HistoryMetrics,
}

A history of storage commands.

Fields

reduced_count: usize

The number of commands at the last time we compacted the history.

commands: Vec<StorageCommand<T>>

The sequence of commands that should be applied.

This list may not be “compact” in that there can be commands that could be optimized or removed given the context of other commands, for example compaction commands that can be unified, or run commands that can be dropped due to allowed compaction.

metrics: HistoryMetrics

Tracked metrics.

Implementations

impl<T: Debug> CommandHistory<T>

pub fn new(metrics: HistoryMetrics) -> Self

Constructs a new command history.

pub fn iter(&self) -> impl Iterator<Item = &StorageCommand<T>>

Returns an iterator over the contained storage commands.

pub fn push(&mut self, command: StorageCommand<T>)

Adds a command to the history.

This action will reduce the history every time it doubles.

pub fn reduce(&mut self)

Reduces the command history to a minimal form.

Trait Implementations

impl<T: Debug> Debug for CommandHistory<T>

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

Formats the value using the given formatter.