Struct CachePolicy 

pub struct CachePolicy {
    pub key_func: Option<Arc<dyn Fn(&Value, &RunnableConfig) -> String + Send + Sync>>,
    pub ttl: Option<Duration>,
    pub max_entries: Option<usize>,
}

Cache policy controlling how node results are cached

Supports default (state-hash-based), TTL-based, and custom key function caching strategies.

Fields

key_func: Option<Arc<dyn Fn(&Value, &RunnableConfig) -> String + Send + Sync>>

Optional custom key function for cache key generation

When set, this function computes the cache key from the current state value and execution config. When unset, the default state-hash-based key is used.

ttl: Option<Duration>

Optional time-to-live for cached entries

max_entries: Option<usize>

Optional maximum number of cache entries

Implementations

impl CachePolicy

pub fn default_policy() -> Self

Create the default cache policy (state-hash-based, no TTL)

pub fn ttl(duration: Duration) -> Self

Create a TTL-based cache policy

Cached entries expire after the specified duration.

pub fn custom_key( key_func: impl Fn(&Value, &RunnableConfig) -> String + Send + Sync + 'static, ) -> Self

Create a custom-key cache policy

Uses the provided function to compute cache keys instead of the default state-hash-based approach.

Trait Implementations

impl Clone for CachePolicy

fn clone(&self) -> CachePolicy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CachePolicy

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

Formats the value using the given formatter.

impl Default for CachePolicy

fn default() -> Self

Returns the “default value” for a type.