Struct ForwardEnv 

pub struct ForwardEnv<'a> {
    pub catalog: &'a NodeCatalog,
    pub cache: &'a dyn CacheStore,
    pub event_bus: &'a Arc<EventBus>,
    pub data_store: Option<&'a Arc<dyn DataStore>>,
    pub driver: Option<&'a EffectDriver>,
}

What a forward pass runs against, besides the graph and the data.

A struct rather than six parameters, for the same reason as RunContext: every strategy takes exactly this set, and a caller forgetting one of six positional arguments is a bug the compiler cannot name.

Fields

catalog: &'a NodeCatalog

Implementations and trained states for every node in the graph.

cache: &'a dyn CacheStore

Output cache consulted and filled during the pass.

event_bus: &'a Arc<EventBus>

Bus the pass emits its node events on.

data_store: Option<&'a Arc<dyn DataStore>>

Row source Batched reads from; the other strategies ignore it.

driver: Option<&'a EffectDriver>

Performs and journals step effects; a graph without steps ignores it, which is why it is an Option and not a requirement.