Callback example

[devendranaga]

Hello,

How do i use tokio to register and perform callbacks when there is timer expiry or socket events? The callback function may be in a different impl of a different file. And there can be many callbacks as possible.

Thanks,
Dev

[Darksonn]

To run some code once a timer expires, you can do this.

tokio::spawn(async {
    tokio::time::sleep(my_duration).await;
    // run your code here
});

As for sockets, you can similarly use an .await on the appropriate socket method to wait for a socket event.

[devendranaga]

Ok, but should i be calling this like below?

impl Event {
    tokio::spawn(async {
        tokio::time::sleep(my_duration).await;
        // handle event
   }
}

Does this work?

[Noah-Kennedy]

No, that is not valid Rust code. tokio::spawn is a function which spawns a task on the runtime. You need to call it within another function.