Processing values from signals (match_signal closure)

[debug-richard]

I am currently working with the org.freedesktop.PackageKit dbus api.
The API is asynchronous and returns a signal for each package to install.
I have used the https://github.com/diwic/dbus-rs/blob/master/dbus/examples/match_signal.rs example to catch the signals and it worked.
However, I am now wondering how to get the "h: ComExampleDbustestHelloHappened" object out of the closure/function and store it in a Vec for further processing.
I tried a few things, but it didn't work.
Somehow it feels that dbus-rs is missing this use case.

[debug-richard]

After all I found a solution to get the data out of the closure using Arc and Mutex:

// Note: Untested modification of the example
let result: Arc<Mutex<Vec<ComExampleDbustestHelloHappened>>> = Arc::new(Mutex::new(Vec::new()));
let result_2 = result.clone();
let _id = proxy.match_signal(|h: ComExampleDbustestHelloHappened, _: &Connection, _: &Message| {
    println!("Hello happened from sender: {}", h.sender);
    result_2.lock().unwrap().push(h);
    true
});
println!("{:?}", result);

[diwic]

This is more of a question about boxed closures than about dbus, but this is one way of doing it. You can also use channels.