Chapter 6. Persistent connections and hubs from other threads
All server implementations seen up to this point in the book have had something in common: they have always been responding to direct messages from a client. Even though they are push systems, a client has always been initiating the procedure:
In a chat, when a user sends a message to the server, this message is sent to the rest of the connected users.
In the tracking system that we showed in Chapter 4 a user’s mouse movement was the action that originated the notification to the other users.
In the shared drawing board example in Chapter 5 when a user drew a point or pressed the button to erase the canvas, the action was sent to the others so that they could update their whiteboards. ...
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