Dependency Injector

A dependency injector which extends facebook injector functionatlity. The injector supports life-cycle pattern what allows to initialize and de-initialize components in a specific order.

Typical usage workflow looks like this:

import "github.com/jrivets/inject"
...
func main() {
	injector := inject.NewInjector()
	defer injector.Shutdown()
	
	injector.Register(&inject.Component{comp1, "comp1"}, &inject.Component{comp2, "comp2"} ...)
	injector.Construct()
	... 
}

Injections rules are the same as described in https://godoc.org/github.com/facebookgo/inject

LifeCycler interface

The inject.LifeCycler component should support 3 functions:

type LifeCycler interface {
	DiPhase() int
	DiInit() error
	DiShutdown()
}

DiPhase() returns an initialization phase for the component (components with lower values are initialized before components with higher values) DiInit() the component initialized. Will be called when all fields are injected. DiShutdown() the component de-initializer. It will be called in injctor.Shutdown() call. The de-initialization process is done in reverse order - components with higher phase values are de-initialized before components with lower ones.

If a life-cycler panics or reports an error during initialization, all previously initialized components will be de-initialized in the reverse or their initialization order and injector.Construct() will panic then.