Rust Programming By Example

Event loop

To simplify the development of our playing engine, we'll use the concept of an event loop. Some actions will be sent to the thread playing the music through this event loop. For instance, we will be able to emit a Load("file.mp3") event, the thread will decode this MP3 file, and start playing it. Another example of an event is Stop, which will stop playing and unload the data.

Let's create an enumeration for the possible actions:

enum Action {
    Load(PathBuf),
    Stop,
}

We're now ready to create the structure of the event loop:

#[derive(Clone)]
struct EventLoop {
    queue: Arc<SegQueue<Action>>,
    playing: Arc<Mutex<bool>>,
}

There's a lot of unknown stuff in this structure, so let's break it down.