The wangle native way of doing this is just to use an IOThreadPoolExecutor: https://github.com/facebook/wangle/blob/master/wangle/concurrent/IOThreadPoolExecuto

The wangle native way of doing this is just to use an IOThreadPoolExecutor: https://github.com/facebook/wangle/blob/master/wangle/concurrent/IOThreadPoolExecutor.h https://github.com/facebook/wangle/blob/master/wangle/concur... Just make a block of threads to run your db tasks, and you can use a promise/future to return the results back to the async code.