feat(runtime): add single threaded runtime option

Cargo.toml

@@ -1,8 +1,8 @@
 [package]
 name = "async_job"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2021"
-description = "Simple async cron jobs for Rust"
+description = "Simple async cron job crate for Rust"
 repository = "https://github.com/spider-rs/async_job"
 readme = "README.md"
 keywords = ["crawler", "spider"]
@@ -16,4 +16,9 @@ chrono = "0.4.31"
 cron = "0.12.0"
 lazy_static = "1.4.0"
 log = "0.4.20"
-tokio = { version = "^1.34.0", features = [ "rt-multi-thread", "macros", "time", "parking_lot" ] }
+tokio = { version = "^1.34.0", features = [ "macros", "time", "parking_lot" ] }
+
+[features]
+default = ["rt-multi-thread"]
+rt = ["tokio/rt"]
+rt-multi-thread = ["tokio/rt-multi-thread"]

README.md

@@ -1,6 +1,6 @@
 # async_job
 
-A simple trait that allows you to attach cron jobs to anything in Rust.
+A simple trait for async cron jobs in Rust.
 
 ## Getting Started
 
@@ -25,6 +25,13 @@ impl Job for ExampleJob {
 }
 ```
 
+If you need to use a single threaded env disable the default feature and set the feature `rt`,
+
+## Feature Flags
+
+1. `rt`: Single threaded tokio runtime.
+1. `rt-multi-thread`: Multi threaded tokio runtime. Enabled by default
+
 ## Examples
 
 Run the example with `cargo run --example example`

src/lib.rs

@@ -1,7 +1,7 @@
 //! # async_job: a simple async cron runner
 //!
 //! Use the `Job` trait to create your cron job struct, pass it to the `Runner` and then start it via `run()` method.
-//! Runner will spawn new thread where it will start looping through the jobs and will run their handle
+//! Runner will spawn new async task where it will start looping through the jobs and will run their handle
 //! method once the scheduled time is reached.
 //!
 //! If your OS has enough threads to spare each job will get its own thread to execute, if not it will be
@@ -12,8 +12,7 @@
 //! ## Example
 //! ```
 //! use async_job::{Job, Runner, Schedule, async_trait};
-//! use std::thread;
-//! use std::time::Duration;
+//! use tokio::time::Duration;
 //! use tokio;
 //! 
 //! struct ExampleJob;
@@ -36,7 +35,7 @@
 //!
 //!     println!("Starting the Runner for 20 seconds");
 //!     runner = runner.run().await;
-//!     thread::sleep(Duration::from_millis(20 * 1000));
+//!     tokio::time::sleep(Duration::from_millis(20 * 1000)).await;
 //!
 //!     println!("Stopping the Runner");
 //!     runner.stop().await;