Crate delay_timer

DelayTimer like crontab is a cyclic task manager with latency properties, but synchronous asynchronous tasks are possible, based on an internal event manager and task scheduler, and supported by the runtime provided by smol and tokio, which makes it easy to manage and dynamic add/cancel/remove is supported.

• TaskBuilder It is a builder for Task that provides APIs for setting such as maximum number of parallel runs, run content, run identity, run duration, etc.
• DelayTimerBuilder It is a builder for DelayTimer that provides APIs for setting such as customization runtime and enable status-report.

Usage

First, add this to your Cargo.toml

[dependencies]
delay_timer = "*"

Next:

use anyhow::Result;
use delay_timer::prelude::*;
use std::time::Duration;
use smol::Timer;

fn main() -> Result<()> {
    // Build an DelayTimer that uses the default configuration of the `smol` runtime internally.
    let delay_timer = DelayTimerBuilder::default().build();

    // Develop a print job that runs in an asynchronous cycle.
    // A chain of task instances.
    let task_instance_chain = delay_timer.insert_task(build_task_async_print()?)?;

    // Get the running instance of task 1.
    let task_instance = task_instance_chain.next_with_wait()?;

    // Cancel running task instances.
    task_instance.cancel_with_wait()?;

    // Remove task which id is 1.
    delay_timer.remove_task(1)?;

    // No new tasks are accepted; running tasks are not affected.
    delay_timer.stop_delay_timer()?;

    Ok(())
}

fn build_task_async_print() -> Result<Task, TaskError> {
   let mut task_builder = TaskBuilder::default();

   let body = || async {
       println!("create_async_fn_body!");

       Timer::after(Duration::from_secs(3)).await;

       println!("create_async_fn_body:i'success");
   };

   task_builder
       .set_task_id(1)
       .set_frequency_repeated_by_seconds(1)
       .set_maximum_parallel_runnable_num(2)
       .spawn_async_routine(body)
}

Use in asynchronous contexts.

use delay_timer::prelude::*;

use anyhow::Result;

use smol::Timer;
use std::time::Duration;

#[tokio::main]
async fn main() -> Result<()> {
    // In addition to the mixed (smol & tokio) runtime
    // You can also share a tokio runtime with delayTimer, please see api `DelayTimerBuilder::tokio_runtime` for details.

    // Build an DelayTimer that uses the default configuration of the Smol runtime internally.
    let delay_timer = DelayTimerBuilder::default().build();

    // Develop a print job that runs in an asynchronous cycle.
    let task_instance_chain = delay_timer.insert_task(build_task_async_print()?)?;

    // Get the running instance of task 1.
    let task_instance = task_instance_chain.next_with_async_wait().await?;

    // Cancel running task instances.
    task_instance.cancel_with_async_wait().await?;


    // Remove task which id is 1.
    delay_timer.remove_task(1)?;

    // No new tasks are accepted; running tasks are not affected.
    Ok(delay_timer.stop_delay_timer()?)
}

fn build_task_async_print() -> Result<Task, TaskError> {
    let mut task_builder = TaskBuilder::default();

    let body = || async {
        println!("create_async_fn_body!");

        Timer::after(Duration::from_secs(3)).await;

        println!("create_async_fn_body:i'success");
    };

    task_builder
        .set_task_id(1)
        .set_frequency_repeated_by_seconds(6)
        .set_maximum_parallel_runnable_num(2)
        .spawn_async_routine(body)
}

Capture the specified environment information and build the closure & task:

#[macro_use]
use delay_timer::prelude::*;

use std::sync::atomic::{
    AtomicUsize,
    Ordering::{Acquire, Release},
};
use std::sync::Arc;
use std::time::Duration;
use smol::Timer;


let delay_timer = DelayTimer::new();

let share_num = Arc::new(AtomicUsize::new(0));
let share_num_bunshin = share_num.clone();

let body = move || {
    let share_num_bunshin_ref = share_num_bunshin.clone();
    async move {
        share_num_bunshin_ref.fetch_add(1, Release);
        Timer::after(Duration::from_secs(9)).await;
        share_num_bunshin_ref.fetch_sub(1, Release);
    }
};


let task = TaskBuilder::default()
    .set_frequency_count_down_by_seconds(1, 9)
    .set_task_id(1)
    .set_maximum_parallel_runnable_num(3)
    .spawn_async_routine(body).expect("");

delay_timer.add_task(task).ok();

Building dynamic future tasks:

#[macro_use]
use delay_timer::prelude::*;
use anyhow::Result;
use std::str::FromStr;
use std::sync::atomic::{
    AtomicUsize,
    Ordering::{Acquire, Release},
};
use std::sync::{atomic::AtomicI32, Arc};
use std::thread::{self, park_timeout};
use std::time::Duration;
use smol::Timer;
use tokio::time::sleep;
use hyper::{Client, Uri};



fn build_task(mut task_builder: TaskBuilder, name:String, id:i32) -> Result<Task, TaskError> {
    let body = move || {
        let name_ref = name.clone();
        async move {
            async_template(id, name_ref).await.expect("Request failed.");

            sleep(Duration::from_secs(3)).await;

            println!("create_async_fn_body:i'success");
        }
    };

    task_builder
        .set_frequency_repeated_by_seconds(8)
        .set_task_id(2)
        .set_maximum_running_time(5)
        .spawn_async_routine(body)
}


 pub async fn async_template(id: i32, name: String) -> Result<()> {
     let client = Client::new();
  
     // The default connector does not handle TLS.
     // Speaking to https destinations will require configuring a connector that implements TLS.
     // So use http for test.
     let url = format!("http://httpbin.org/get?id={}&name={}", id, name);
     let uri: Uri = url.parse()?;
  
     let res = client.get(uri).await?;
     println!("Response: {}", res.status());
     // Concatenate the body stream into a single buffer...
     let buf = hyper::body::to_bytes(res).await?;
     println!("body: {:?}", buf);
     Ok(())
 }

Re-exports

• pub use anyhow;
• pub use cron_clock;
• pub use snowflake;

Modules

• entity
  DelayTimer is a cyclic task manager with latency properties, based on an internal event manager and task scheduler, and supported by the runtime provided by smol, which makes it easy to manage asynchronous/synchronous/scripted cyclic tasks.
• error
  Public error of delay-timer..
• macros
  This macro module provides the declaration macros used for the conditional compilation of lib, and the helper macros provide cycle asynchronous tasks for the user.
• prelude
  A “prelude” for users of the delay-timer crate.
• timer
  timer is the core module of the library , it can provide an API for task building , task scheduling , event handling , resource recovery .
• utils
  utils is a tool module that provides easy shell-command parsing, and functions that generate closures.