@spec async?(t()) :: boolean()

Returns whether or not the source should be running synchronously or asynchronously with respect to the process making Dataloader function calls.

@spec fetch(t(), batch_key(), item_key()) :: {:ok, term()} | {:error, term()}

Fetch the result found under the given batch and item keys.

@spec load(t(), batch_key(), item_key()) :: t()

Enqueue an item to be loaded under a given batch

@spec pending_batches?(t()) :: boolean()

Determine if there are any batches that have not yet been run.

@spec put(t(), batch_key(), item_key(), term()) :: t()

Put a value into the results.

Useful for warming caches. The source is permitted to reject the value.

@spec run(t()) :: t()

Run any batches queued up for this source.

@spec timeout(t()) :: number()

Returns the timeout (in ms) for the source.

This is important for ensuring the dataloader obeys the timeouts when running multiple sources concurrently