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Hub class. Deriving from the Hub class is a useful way to build a SignalR application. You can create public methods on your hub class and then use those methods by calling them from scripts in a web page. In the chat code, clients call the ChatHub. Send method to send a new message. The hub then sends the message to all clients by calling Clients. Use the Microsoft. Clients dynamic property to communicate with all clients connected to this hub.

Call a function on the client like the broadcastMessage function to update clients. The index. The code carries out many important tasks. It declares a proxy to reference the hub, declares a function that the server can call to push content to clients, and it starts a connection to send messages to the hub. In JavaScript the reference to the server class and its members has to be camelCase. The hub class on the server calls this function to push content updates to each client.

The two lines that HTML-encode the content before displaying it are optional and show a good way to prevent script injection. Sending the location of the shape on every mouse move event creates an unnecessary amount of network traffic. The app needs to throttle the messages from the client. Use the javascript setInterval function to set up a loop that sends new position information to the server at a fixed rate.

This loop is a basic representation of a "game loop. You have to replace the script references again.

They must match the versions of the scripts in the project. This new code adds the updateServerModel function. It gets called on a fixed frequency. The function sends the position data to the server whenever the moved flag indicates that there's new position data to send.

Since the app throttles the number of messages that get sent to the server, the animation won't appear as smooth did at first. In the current application, messages sent from the server to the client go out as often as they're received. This network traffic presents a similar problem as we see on the client.

The app can send messages more often than they're needed. The connection can become flooded as a result. This section describes how to update the server to add a timer that throttles the rate of the outgoing messages. This code expands the client to add the Broadcaster class. The new class throttles the outgoing messages using the Timer class from the.

NET framework. It's good to learn that the hub itself is transitory. It's created every time it's needed. So the app creates the Broadcaster as a singleton. It uses lazy initialization to defer the Broadcaster 's creation until it's needed. That guarantees that the app creates the first hub instance completely before starting the timer.

The call to the clients' UpdateShape function is then moved out of the hub's UpdateModel method. If every leecher would share his or her part with the other leechers, they can all retrieve the complete file without the seeder having to send it to every leecher individually. This make a big difference in terms of data traffic and processing power for the seeder.

In theory the seeder could even shut down his computer or server once every part has been downloaded once, because the leechers could exchange the parts amongst each other afterwards. However, in reality it doesn't work that way, for example because of leechers who shut down their computer without uploading a specific part to someone else first. Start General Introduction for beginners Usenet related terms What are incomplete files?

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