文章目录
async-std
【使用文档】
使用示例：
[dependencies]
futures = "0.3.8"
[dependencies.async-std]
version = "1.7.0"
features = ["attributes"]
use std::time;
use futures::future::{join,join_all};
use async_std::task;
use std::sync::{Arc,Mutex};
async fn hello(){
println!("hello")
}
async fn connect_db() -> String{
task::sleep(time::Duration::from_secs(1)).await;
String::from("connect_db successfully")
}
async fn open_file() -> String{
task::sleep(time::Duration::from_secs(1)).await;
String::from("connect_db successfully")
}
async fn back_with_result() -> Result<String,()>{
Ok(String::from("Result"))
}
async fn main_exe(){
hello().await;
let (db,filename) = join(connect_db(),open_file()).await;
println!("====={},{}=========",db,filename);
println!("====={}=========",back_with_result().await.unwrap())
}
async fn select_db(input:&str) -> String{
task::sleep(time::Duration::from_secs(1)).await;
format!("select :{}",input)
}
async fn get_cities() ->Vec<String>{
let cities = vec![
String::from("shanghai"),
String::from("beijing"),
String::from("guangzhou"),
String::from("shenzhen")
];
let city_vec:Arc<Mutex<Vec<String>>> = Arc::new(Mutex::new(vec![]));
join_all(cities.into_iter().map(|city|{
build_city(city_vec.clone(),city)
})).await;
return city_vec.lock().unwrap().clone();
}
async fn build_city(city_vec:Arc<Mutex<Vec<String>>>,city:String){
task::sleep(time::Duration::from_secs(1)).await;
println!("Super city build");
city_vec.lock().unwrap().push(format!("china super city {}",city))
}
#[async_std::main]
async fn main() {
let now = time::Instant::now();
main_exe().await;
println!("main!");
let users = vec!["ma","hua","teng"];
let user_info = join_all(users.into_iter().map(|user|{
select_db(user)
})).await;
println!("users info : {:?}",user_info);
println!("executed in {:?}!",now.elapsed());
println!("{:?}!",get_cities().await);
}
