Derivable Object Pool

This crate provides a trait that can be derived to implement an object pool for a type with a single line of code. Allowing the user to forget about the implementation details of the ObjectPool and focus on the important parts of their code

This crate has the following features compared to other object pool crates:

• Derivable: The pool is simple to use and can be used with any type. Can be just derived using the #[derive(ObjectPool)] attribute macro.
• Reusable: The user can use the ObjectPool::new function to create objects from the pool, which will reuse objects from the pool if possible. This items are wrapped in a Reusable struct, which will be returned to the pool when dropped.
• Thread Safe: The pool is thread-safe (through the use of a Mutex) and can be used in a multi-threaded environment.
• Simple: The user doesn't need to create a pool for each type manually and can use the ObjectPool::new function to create objects from the pool.
• Flexible: The user can configure the pool to use a custom generator function (see attributes in #[derive(ObjectPool)]) or just use the Default trait to create new objects.

Installation

Add the following to your Cargo.toml file:

[dependencies]
derivable-object-pool = "0.1.1"

Usage

Without specifying any attributes, the pool will use the Default trait to create new objects:

use derivable_object_pool::prelude::*;

#[derive(Default, ObjectPool)]
struct Test(i32);

fn main() {
    let mut obj = Test::new();
    obj.0 += 1;
    assert_eq!(obj.0, 1);
    drop(obj); // obj is returned to the pool
    assert_eq!(Test::pool().len(), 1);
    let mut obj = Test::new();
    assert_eq!(Test::pool().len(), 0);
    assert_eq!(obj.0, 1); 
}

Or you can specify a custom generator function using the #[generator] attribute:

use derivable_object_pool::prelude::*;

#[derive(ObjectPool)]
#[generator(Test::new_item)]
struct Test(i32);

impl Test {
    fn new_item() -> Self {
        Test(10)
    }
}

fn main() {
    let mut obj = Test::new();
    obj.0 += 1;
    assert_eq!(obj.0, 11);
    drop(obj); // obj is returned to the pool
    assert_eq!(Test::pool().len(), 1);
    let mut obj = Test::new();
    assert_eq!(Test::pool().len(), 0);
    assert_eq!(obj.0, 11); 
}

Documentation

The documentation can be found here.

License

This project is licensed under the dual MIT/Apache-2.0 license. For more information, see LICENSE-APACHE and LICENSE-MIT.

lib.rs:

Derivable Object Pool Macro

Internal crate for derivable-object-pool crate. That provides a derive macro for ObjectPool trait.