acktor 1.0.9

Pure-Rust actor framework built on top of the Tokio async runtime
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79

use std::any::Any;
use std::sync::atomic::{AtomicU64, Ordering};

use tracing::{debug, warn};

use crate::actor::{ActorId, JoinHandle};
use crate::address::{Recipient, Sender, SenderId};
use crate::signal::Signal;

pub use disqualified::ShortName;

/// Logs at info level only in debug mode.
#[doc(hidden)]
#[macro_export]
macro_rules! __debug_info {
    ($($arg:tt)+) => {
        #[cfg(debug_assertions)]
        tracing::info!($($arg)+);
    };
}

/// Logs at trace level only in debug mode.
#[doc(hidden)]
#[macro_export]
macro_rules! __debug_trace {
    ($($arg:tt)+) => {
        #[cfg(debug_assertions)]
        tracing::trace!($($arg)+);
    };
}

#[doc(inline)]
pub use crate::__debug_info as debug_info;
#[doc(inline)]
pub use crate::__debug_trace as debug_trace;

static ACTOR_ID_ALLOCATOR: AtomicU64 = AtomicU64::new(0);

/// Maximum value `create_actor_id` may return. The MSB of the u64 actor id is reserved.
#[doc(hidden)]
pub const MAX_ACTOR_ID: u64 = (1 << 63) - 1;

#[inline]
pub(crate) fn create_actor_id() -> ActorId {
    let id = ACTOR_ID_ALLOCATOR.fetch_add(1, Ordering::Relaxed);
    // in practice 2^63 actors is impossible to reach, so only a debug assertion here
    debug_assert!(
        id <= MAX_ACTOR_ID,
        "actor id space exhausted (more than {} actors allocated in the current process)",
        MAX_ACTOR_ID
    );
    id
}

/// Terminates an actor by sending it a [`Signal::Terminate`] message and awaiting its
/// [`JoinHandle`].
pub async fn terminate_actor<A>(address: A, join_handle: JoinHandle<()>)
where
    A: Into<Recipient<Signal>>,
{
    let address = address.into();
    if let Err(e) = address.do_send(Signal::Terminate).await {
        warn!("Could not stop actor {}: {}", address.index(), e);
        join_handle.abort();
    }
    debug!("Waiting for actor {} to stop", address.index());
    let _ = join_handle.await;
}

#[inline]
pub(crate) fn panic_info_to_string(info: &(dyn Any + Send)) -> String {
    if let Some(s) = info.downcast_ref::<&str>() {
        s.to_string()
    } else if let Some(s) = info.downcast_ref::<String>() {
        s.clone()
    } else {
        "could not capture the panic info".to_string()
    }
}