Multiple Event Listeners

Arbitrarily many event listeners can be used in a single job. This is useful when you want to listen to multiple sources to handle job logic

For example, using the example of the PeriodicEventListener above, we can add a TangleEventListener to the job:

#[job(
    id = 0,
    params(x),
    result(_),
    event_listener(TangleEventListener, PeriodicEventListener::<6000, WebPoller, serde_json::Value, MyContext>), // <-- Register the event listeners here
    verifier(evm = "IncredibleSquaringBlueprint")
)]
pub fn hello_event_listener(
    x: u64,
    context: MyContext,
    env: GadgetConfiguration<parking_lot::RawRwLock>,
) -> Result<u64, Infallible> {
    Ok(x.saturating_pow(2u32))
}

In this case, both the TangleEventListener, which is listening to the Tangle network, and the PeriodicEventListener, which is polling a web server, will be used in parallel to listen for events.