Parallel Producer Consumer Queues

Many programs do some sort of data transform and can be described as read/generate some data, process the data, write the output. It's always beneficial if some steps are performed in parallel. E.g. the reader pre-fetches a few data items so that when the 'processing' part of the program is ready for a new chunk of data the data is already there waiting. Ths post provides two quick solutions for java and C#. Java with Project Reactor. C# using TPL Dataflow (Task Parallel Library).