Struct SystemConfig 

pub struct SystemConfig(/* private fields */);

Registry of all runtime-tunable configuration entries.

Subsystems call register() at startup to declare their tunable parameters. The bootstrap process calls apply_persisted() to override defaults with values loaded from storage.

SystemConfig is cheaply cloneable — cloning increments an internal Arc reference count without copying any data.

Implementations

impl SystemConfig

pub fn new() -> Self

pub fn register( &self, key: &str, default: Value, description: &'static str, requires_restart: bool, )

Register a configuration key with its default value and metadata.

The default value is inserted at CommitVersion(0) so it is visible to all transactions. If the key is already registered, this is a no-op.

pub fn apply_persisted(&self, key: &str, version: CommitVersion, value: Value)

Apply a persisted value loaded from storage during bootstrap.

If the key is not registered, the value is silently ignored (it may be from a removed config that no longer exists).

pub fn update(&self, key: &str, version: CommitVersion, value: Value)

Update a config value at the given commit version (called from post-commit interceptor).

Panics if the key is not registered — callers must verify via get() before calling this.

pub fn get(&self, key: &str) -> Option<Value>

Get the latest value for a config key.

pub fn get_default(&self, key: &str) -> Option<Value>

Get the registered default value for a config key.

pub fn get_at(&self, key: &str, version: CommitVersion) -> Option<Value>

Get the value for a config key as of a specific snapshot version.

pub fn get_uint8(&self, key: &str) -> Option<u64>

Get the current value as a u64, or None if the key is not registered. Panics if the key is registered but the value is not Value::Uint8.

pub fn require_uint8(&self, key: &str) -> u64

Get the current value as a u64, panicking if the key is not registered or the value is not Value::Uint8.

pub fn list_all(&self) -> Vec<ConfigDef>

List all registered configuration entries with their latest values.

pub fn list_all_at(&self, version: CommitVersion) -> Vec<ConfigDef>

List all registered configuration entries with values as of a specific snapshot version.

Trait Implementations

impl Clone for SystemConfig

fn clone(&self) -> SystemConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SystemConfig

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

Formats the value using the given formatter.

impl Default for SystemConfig

fn default() -> Self

Returns the “default value” for a type.