# Listening to Events

When a class needs to receive network events, such as be notified of data arrival, it must implement the `NetworkEventListener` interface. Once registered in the `NetworkManager`, it will receive network events each time the server generates them.

## NetworkEventListener

This interface has the following function, that is called when the corresponding event is triggered in the `NetworkManager`:

* `onDataArrived()`: called when the server sends player data.

## MockNetworkEventListener

Implements the following functions to extract information about received network events:

* `getDataArrived()`: returns the amount of network events received.
* `resetDataArrived()`: resets the counter of network events received.
* `getStoredPlayers()`: returns the player data received in the most recent network event.


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