Examining the TCP transport
The previous example illustrates how a complex set of processes can make use of a number of different concepts at once. If you consider that each cook must follow a set of tasks (a recipe) in the correct order in order to produce a dish, our example makes use of asynchronous, parallel, concurrent, and synchronous task management, combined with queue-based task distribution, all flowing together harmoniously.
The TCP transport makes use of most of these concepts, though the concurrent nature of RAET has been replaced with an asynchronous model.
The TCP transport makes use of a Python library called Tornado, which is an asynchronous networking library. With the introduction of the TCP transport, the ZeroMQ transport was also retrofitted to be managed by the Tornado library. To sum up, this means that while SSH is synchronous and RAET is concurrent, ZeroMQ and TCP are both asynchronous. However, while the ZeroMQ transport uses ZeroMQ to handle queuing and communication...
