9 stable releases
3.1.0 | Dec 20, 2023 |
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3.0.0 | Nov 24, 2023 |
2.1.2 | Aug 14, 2023 |
2.1.1 | Apr 11, 2023 |
1.0.0 | Sep 27, 2022 |
#245 in Rust patterns
588 downloads per month
Used in 4 crates
140KB
3K
SLoC
More Dependency Injection
More DI is a dependency injection (DI) library for Rust. A trait
or struct
can be used as the injected type.
You may be looking for:
Features
This crate provides the following features:
- default - Abstractions for dependency injection, plus the builder and inject features
- builder - Functions for configuring service descriptors
- async - Use dependencies in an asynchronous context
- inject - Code-generate common injection scenarios
- lazy - Lazy-initialize service resolution
- fmt - Additional output formatting
- alias - Use alternate type aliases
Supported Lifetimes
A service can have the following lifetimes:
- Transient - a new instance is created every time it is requested
- Singleton - a single, new instance is created the first time it is requested
- Scoped - a new instance is created once per provider that it is requested from
Dependency Injection in Action
Consider the following traits and structures.
Proc macro attributes are not required, but they are the fastest and simplest approach to add DI in your applications.
use di::*;
use std::rc::Rc;
trait Phrase {
fn salutation(&self) -> &str;
}
#[injectable(Phrase)]
struct EnglishPhase;
impl Phrase for EnglishPhrase {
fn salutation(&self) -> &str {
"Hello world!"
}
}
#[injectable]
struct Person {
phase: Rc<dyn Phrase>,
}
impl Person {
fn speak(&self) -> &str {
self.phrase.salutation()
}
}
This information can now be composed into a simple application:
use crate::*;
use di::*;
fn main() {
let provider = ServiceCollection::new()
.add(EnglishPhrase::singleton())
.add(Person::transient())
.build_provider()
.unwrap();
let person = provider.get_required::<Person>();
println!("{}", person.speak());
}
License
This project is licensed under the MIT license.
Dependencies
~0.1–9.5MB
~48K SLoC