As part of config loaders, it would be nice to have Filer based ConfigLoader implementation

Threader.finish() is using Thread.sleep() which is inefficient. Can be replaced with ExecutorService.awaitTermination()

Need a general purpose tool for implementing batching. This is useful where producers are producing items and consumers are consuming in batches. Examples, producers (anything) -> consumers (db writers).

There are some use cases where you may not want to wait for a full batch to arrive and prefer to get a partial batch after a max wait period.

Implement a poll(timeout, unit) method to allow consumers greater freedom.

Often times when consuming a batch, the first operation is to transform a Batch<T> into a more appropriate "Batch" construct. E.g. when writing a batch to Elasticsearch, you would transform a Batch<T> into a BulkRequestBuilder. This causes a double iteration over the set of elements, the first when batching and the second by iterating over the batch. If the Batcher itself can transform and accumulate into the appropriate final batch object, this double iteration can be removed.