iceberg/runtime/
mod.rs

1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements.  See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership.  The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License.  You may obtain a copy of the License at
8//
9//   http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied.  See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18// This module contains the async runtime abstraction for iceberg.
19
20use std::future::Future;
21use std::pin::Pin;
22use std::task::{Context, Poll};
23
24use tokio::task;
25
26pub struct JoinHandle<T>(task::JoinHandle<T>);
27
28impl<T> Unpin for JoinHandle<T> {}
29
30impl<T: Send + 'static> Future for JoinHandle<T> {
31    type Output = T;
32
33    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
34        match self.get_mut() {
35            JoinHandle(handle) => Pin::new(handle)
36                .poll(cx)
37                .map(|r| r.expect("tokio spawned task failed")),
38        }
39    }
40}
41
42#[allow(dead_code)]
43pub fn spawn<F>(f: F) -> JoinHandle<F::Output>
44where
45    F: std::future::Future + Send + 'static,
46    F::Output: Send + 'static,
47{
48    JoinHandle(task::spawn(f))
49}
50
51#[allow(dead_code)]
52pub fn spawn_blocking<F, T>(f: F) -> JoinHandle<T>
53where
54    F: FnOnce() -> T + Send + 'static,
55    T: Send + 'static,
56{
57    JoinHandle(task::spawn_blocking(f))
58}
59
60#[cfg(test)]
61mod tests {
62    use super::*;
63
64    #[tokio::test]
65    async fn test_tokio_spawn() {
66        let handle = spawn(async { 1 + 1 });
67        assert_eq!(handle.await, 2);
68    }
69
70    #[tokio::test]
71    async fn test_tokio_spawn_blocking() {
72        let handle = spawn_blocking(|| 1 + 1);
73        assert_eq!(handle.await, 2);
74    }
75}
iceberg/runtime/mod.rs

iceberg/runtime/
mod.rs
