Struct ConfigWatcher 

pub struct ConfigWatcher {
    pub poll_interval_ms: u64,
    /* private fields */
}

Configuration hot-reload watcher: polls the configuration center at a fixed interval and notifies subscribers when value changes are detected.

Since the current implementation is a pure in-memory model, the watcher detects changes by recording the last snapshot and comparing it with the current values. In real-world scenarios this can be replaced with long polling or the Watch API of Consul/Nacos.

Fields

poll_interval_ms: u64

Polling interval (in milliseconds)

Implementations

impl ConfigWatcher

pub fn new(poll_interval_ms: u64) -> Self

pub fn watch(&self, key: &str, callback: ConfigChangeCallback)

Register a change listener for a key

pub fn poll<C: ConfigCenter>(&self, center: &C) -> usize

Perform a single poll: compare the current configuration with the last snapshot and trigger change callbacks. Returns the number of changes detected in this poll.

pub fn watcher_count(&self) -> usize

Returns the number of currently registered watchers

Trait Implementations

impl Default for ConfigWatcher

fn default() -> Self

Returns the “default value” for a type.