1 unstable release
0.1.0 | Oct 22, 2021 |
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#12 in #thruster
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Used in thruster
12KB
131 lines
Thruster Jab
Because this is a dependency injection library, and shots are injected, and shots are called jabs in the UK.
What is this?
Thruster Jab is a dependency injection library for your service injection needs. It works using dynamic dispatch via Box<dyn Any>
. If you're looking to make something that will need mocks in order to test (say, an API that makes external calls, or a service that is very expensive) then Jab might be helpful to you.
Example
Although built for thruster, Jab can be used independently. A simple example would be:
struct A(i32);
trait C {}
impl C for A {}
let mut jab = JabDI::default();
let a = A(0);
provide!(jab, dyn C, a);
let something = fetch!(jab, dyn C); // This is the original a that we passed in, now as a C trait.
A slightly longer, but more "copy pasta" example (taken from our tests because I'm lazy) would be:
// Just making two structs that impl two traits
#[derive(Debug, PartialEq)]
struct A(i32);
#[derive(Debug, PartialEq)]
struct B(i32);
trait C {
fn valc(&self) -> i32;
}
trait D {
fn vald(&self) -> i32;
}
impl C for A {
fn valc(&self) -> i32 {
self.0
}
}
impl D for B {
fn vald(&self) -> i32 {
self.0
}
}
// This is the good part
let mut jab = JabDI::default();
let a = A(0);
let b = B(1);
provide!(jab, dyn C, a);
provide!(jab, dyn D, b);
assert_eq!(
0,
fetch!(jab, dyn C).valc(),
"it should correctly find struct A for trait C"
);
assert_eq!(
1,
fetch!(jab, dyn D).vald(),
"it should correctly find struct B for trait D"
);
For use with actual tests, check out our hello_world.rs
example.