code: void batchReady(String batch) {
      if (log.isDebugEnabled()) {
        log.debug(String.format("%s - Batch ready: Batch[batch=%s]", this, batch));
      }
      eventBus.send(outAddress, new JsonObject().putString("action", "batch").putString("batch", batch));
    }
docs: Indicates that an input batch is ready.