Struct warpgrapher::engine::loader::NodeLoader

pub struct NodeLoader<RequestCtx: RequestContext> { /* private fields */ }

Implementations

impl<RequestCtx> NodeLoader<RequestCtx> where
    RequestCtx: RequestContext, 

pub fn new(
    pool: <<RequestCtx as RequestContext>::DBEndpointType as DatabaseEndpoint>::PoolType,
    info: Info
) -> Self

Trait Implementations

impl<RequestCtx> Fetcher for NodeLoader<RequestCtx> where
    RequestCtx: RequestContext, 

type Key = NodeLoaderKey

The type used to look up a single value in a batch.

type Value = Node<RequestCtx>

The type returned in a batch. Value is usually a single database record, but could also be a more sophisticated type, such as a Vec of values for a Fetcher that deals with one-to-many relationships.

type Error = Error

The error indicating that fetching a batch failed.

fn fetch<'life0, 'life1, 'life2, 'life3, 'async_trait>(
    &'life0 self,
    keys: &'life1 [NodeLoaderKey],
    values: &'life2 mut Cache<'life3, NodeLoaderKey, Node<RequestCtx>>
) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>> where
    'life0: 'async_trait,
    'life1: 'async_trait,
    'life2: 'async_trait,
    'life3: 'async_trait,
    Self: 'async_trait, 

Retrieve the values associated with the given keys, and insert them into values if found. If Ok(_) is returned, then any keys not inserted into values will be marked as “not found” (meaning any future attempts to retrieve them will fail). If Err(_) is returned, then the caller(s) waiting on the batch will receive a LoadError::FetchError with the message from returned error (note that any values inserted into values before the Err(_) is returned will still be cached). See the Batcher docs for more details.