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use std::ptr;
use crate::anyhow::Result;
use crate::runtime::AsyncKernel;
use crate::runtime::Block;
use crate::runtime::BlockMeta;
use crate::runtime::BlockMetaBuilder;
use crate::runtime::MessageIo;
use crate::runtime::MessageIoBuilder;
use crate::runtime::StreamIo;
use crate::runtime::StreamIoBuilder;
use crate::runtime::WorkIo;
pub struct NullSource {
item_size: usize,
}
impl NullSource {
pub fn new(item_size: usize) -> Block {
Block::new_async(
BlockMetaBuilder::new("NullSource").build(),
StreamIoBuilder::new().add_output("out", item_size).build(),
MessageIoBuilder::new().build(),
NullSource { item_size },
)
}
}
#[async_trait]
impl AsyncKernel for NullSource {
async fn work(
&mut self,
_io: &mut WorkIo,
sio: &mut StreamIo,
_mio: &mut MessageIo<Self>,
_meta: &mut BlockMeta,
) -> Result<()> {
let o = sio.output(0).slice::<u8>();
debug_assert_eq!(o.len() % self.item_size, 0);
unsafe {
ptr::write_bytes(o.as_mut_ptr(), 0, o.len());
}
sio.output(0).produce(o.len() / self.item_size);
Ok(())
}
}
pub struct NullSourceBuilder {
item_size: usize,
}
impl NullSourceBuilder {
pub fn new(item_size: usize) -> NullSourceBuilder {
NullSourceBuilder { item_size }
}
pub fn build(&mut self) -> Block {
NullSource::new(self.item_size)
}
}