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

use crate::anyhow::Result;
use crate::runtime::Block;
use crate::runtime::BlockMeta;
use crate::runtime::BlockMetaBuilder;
use crate::runtime::Kernel;
use crate::runtime::MessageIo;
use crate::runtime::MessageIoBuilder;
use crate::runtime::Pmt;
use crate::runtime::StreamIoBuilder;
use crate::runtime::WorkIo;

/// Forward messages.
pub struct MessageCopy {}

impl MessageCopy {
    pub fn new() -> Block {
        Block::new(
            BlockMetaBuilder::new("MessageCopy").build(),
            StreamIoBuilder::new().build(),
            MessageIoBuilder::new()
                .add_output("out")
                .add_input("in", MessageCopy::handler)
                .build(),
            MessageCopy {},
        )
    }

    #[message_handler]
    async fn handler(
        &mut self,
        io: &mut WorkIo,
        mio: &mut MessageIo<Self>,
        _meta: &mut BlockMeta,
        p: Pmt,
    ) -> Result<Pmt> {
        match p {
            Pmt::Finished => {
                io.finished = true;
            }
            p => {
                mio.post(0, p).await;
            }
        }
        Ok(Pmt::Ok)
    }
}

#[doc(hidden)]
#[async_trait]
impl Kernel for MessageCopy {}