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autoinject's Introduction

AutoInject

AutoInject is a lightweight golang dependency injection framework

Build Status: Build Status

Basic Usage - AutoInjection

import "github.com/henrythethird/autoinject"

Given a service you'd like to inject, register it with the fully qualified struct name to the container:

type Name struct {}

container := NewContainer()
container.Register("mypackage.Name", func() interface{} {
    return new(Name)
})

Now we need to set up the receiving container with the necessary tags. Note: Make sure the service is a pointer

type SomeStruct struct {
    Service *Name `autoinject="-"`
}

Once we have done this, we can tell the container to automatically inject the described services

myService := new(SomeStruct)

container.AutoInject(myService)

Basic Usage - Parameter Injection

The injectable named parameters can be of any type. Here a basic example

container := NewContainer()
container.AddParameter("theAnswerToEverything", 42)

// We can simply get the parameter out again:
container.GetParameter("theAnswerToEverything")
/* This requires the parameter to be cast, hence is a bit ugly.
 * Another solution is to create a struct and automatically inject the named parameter:
 */

type SomeStruct struct {
    Answer int `autoinject="theAnswerToEverything"`
}

myStruct := new(SomeStruct)
container.AutoInject(myStruct)
// Now the parameter is injected

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