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https://github.com/sabirvirtuoso/Kraken
Simple Dependency Injection container for Swift. Use protocols to resolve dependencies with easy-to-use syntax!
https://github.com/sabirvirtuoso/Kraken
Last synced: 5 days ago
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Simple Dependency Injection container for Swift. Use protocols to resolve dependencies with easy-to-use syntax!
- Host: GitHub
- URL: https://github.com/sabirvirtuoso/Kraken
- Owner: sabirvirtuoso
- License: mit
- Fork: true (mahbub-morshed/Kraken)
- Created: 2017-07-13T10:25:37.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2017-02-28T13:16:19.000Z (almost 8 years ago)
- Last Synced: 2024-11-10T04:38:25.230Z (about 1 month ago)
- Language: Swift
- Size: 170 KB
- Stars: 1
- Watchers: 2
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# Kraken
[](https://travis-ci.org/sabirvirtuoso/Kraken)
[](https://codeclimate.com/github/sabirvirtuoso/Kraken)
[](http://cocoapods.org/pods/Kraken)
[](http://cocoapods.org/pods/Kraken)
[](http://cocoapods.org/pods/Kraken)
[](https://developer.apple.com/swift)
_Photo courtesy of [www.krakenstudios.blogspot.com](http://krakenstudios.blogspot.com/)_
## Introduction
`Kraken` is a simple **Dependency Injection Container**.
It's aimed to be as simple as possible yet provide rich functionality usual for DI containers on other platforms. It's inspired by [Dip](https://github.com/AliSoftware/Dip) and some other DI containers.
* You start by creating a `Dependency Configurator` for bootstrapping and **registering your dependencies, by associating a _protocol_ or _type_ to either an `implementation type`, an `implementation` or a `factory`**. It is preferrable to call your `Dependency Configurator` from `main.swift`.
* Then you can call `inject(typeToInject)` to **resolve an instance of _protocol_ or _type_** based on the bootstrapping in your `Dependency Configurator`.
## Documentation
`Kraken` is yet to be documented fully but it comes with a sample project that lets you try all its features and become familiar with the API. You can find it in `Trigger.xcworkspace`.
File an issue if you have any question.
To run the example project, clone the repo, and run `pod install` from the Example directory first.
## Features
- **Scopes**. Kraken supports 3 different scopes (or life cycle strategies): _Prototype_, _Singleton_, _EagerSingleton_;
- **Named definitions**. You can register an `implementation type`, an `implementation` or a `factory` for a protocol or type;
- **Runtime arguments**. You can register factories that accept up to 3 runtime arguments (You can create an extension to increase number of runtime arguments);
- **Multiple definitions**. You can register multiple `implementation types`, `implementations` or `factories` per type or protocol;
- **Circular dependencies**. Kraken can resolve circular dependencies;
- **Auto-wiring**. Kraken can infer your components' dependencies injected in constructor and automatically resolve them.
- **Easy configuration**. No complex container hierarchy, no unneeded functionality;
- **Thread safety**. Registering and resolving components is thread safe;
- **Helpful error messages**. If something can not be resolved at runtime Kraken throws an error that completely describes the issue;
## Basic usage
Create a Dependency Configurator file where you bootstrap your dependencies much like the example shown below:
```swift
import Kraken
class DependencyConfigurator {
static func bootstrapDependencies() {
// Register a protocol or type by providing its implementation type
Kraken.register(ServiceA.self, implementationType: ServiceAImpl.self, scope: .singleton)
// Register same protocol or type with different dependency by providing tag that can be either Int, String or Custom Type conforming to DependencyTagConvertible
Kraken.register(ServiceA.self, tag: CustomTag.One, implementationType: CustomFactory.self, scope: .singleton)
// Register a protocol or type by providing its implementation
Kraken.register(ServiceC.self, implementation: dummyImplementation, scope: .singleton)
// Register a protocol or type having weak property to allow Kraken to handle circular dependencies
// An example of such protocol (ServiceB) is given below
Kraken.register(ServiceB.self, implementationType: ServiceBImpl.self, scope: .singleton) {
(resolvedInstance: Injectable) -> () in
let serviceB = resolvedInstance as! ServiceBImpl
serviceB.serviceA = injectWeak(ServiceA.self).value as! ServiceAImpl
}
// Register a protocol or type having runtime arguments to be injected in constructor
Kraken.register(ServiceD.self) {
ServiceDImpl(host: $0, port: $1, serviceB: inject(ServiceB.self)) as ServiceD
}
// Register generic protocols or types
Kraken.register(GenericDataSource.self, implementationType: ServiceAImplDataSource.self, scope: .eagerSingleton)
// Register a protocol or type whose components' dependencies are injected automatically by container
Kraken.register(ServiceE.self) {
ServiceEImpl(serviceA: $0, serviceB: $1, serviceC: $2)
}
}
}
```
```swift
import Kraken
protocol ServiceB: Injectable {
weak var serviceA: ServiceA? { get set }
var serviceC: ServiceC { get set }
var serviceBImplDataSource: GenericDataSource { get set }
func myCompanyB() -> String
}
```
It is worth mentioning that the protocols or types which are registered must conform to the `Injectable` protocol in order to be resolved by the container as shown in the example below:
```swift
import Kraken
protocol ServiceA: Injectable {
func myCompanyA() -> String
}
```
If you want to register multiple dependencies per type or protocol, you have to register with tag conforming to `DependencyTagConvertible`. You can declare a custom enum for this as shown below:
```swift
import Kraken
enum CustomTag: Int, DependencyTagConvertible {
case One = 1, Two
}
```
After bootstrapping dependencies, its injection is as simple as invoking `inject()` which can be of different types as shown below:
```swift
import Kraken
// Inject dependency whose implementation was registered
let serviceC: ServiceC = inject(ServiceC.self)
// Inject dependency whose implementation type was registered
let serviceA: ServiceA = inject(ServiceA.self)
// Inject dependency whose implementation type was registered with tag
let serviceA: ServiceA = inject(ServiceA.self, tag: CustomTag.One)
// Inject dependency providing runtime arguments
let serviceD: ServiceD = inject(ServiceD.self, withArguments: "localhost", 8080)
// Inject dependency which is resolved by container through AutoWiring
let serviceE: ServiceE = inject(ServiceE.self)
```
## Installation
Kraken is built with Swift 3.0.
#### CocoaPods
Kraken is available through [CocoaPods](http://cocoapods.org). To install
it, simply add the following line to your Podfile:
```ruby
pod 'Kraken', '1.5.0'
```
#### Manually
1. Download and drop ```/Kraken``` folder in your project.
2. Congratulations!
## Author
Syed Sabir Salman-Al-Musawi, [email protected]
I'd also like to thank [**Sharafat Ibn Mollah Mosharraf**]([email protected]) for his big support during the development phase.
**Kraken** is available under the **MIT license**. See the `LICENSE` file for more info.
The GIF at the top of this `README.md` is from [www.krakenstudios.blogspot.com](http://krakenstudios.blogspot.com/)