Injector is a small dependency injection library for Scala and Scala.js.
Add Injector dependency to your project.
// For Scala.js
libraryDependencies += "com.github.fomkin" %%% "injector" % "0.1.0"
// For Scala.jvm
libraryDependencies += "com.github.fomkin" %% "injector" % "0.1.0"Define modules
class RobotRegistry {
def deploy(robot: Robot): Unit = {
println(s"Robot ${robot.uuid} deployed")
}
}
class LeftLeg()
class RightLeg()
class Robot(registry: RobotRegistry, leftLeg: LeftLeg, rightLeg: RightLeg) {
val uuid = UUID.randomUUID()
println(s"New robot $uuid created")
registry.deploy(this)
}Configure robots factory
import injector._
val injector = configure("robots")(
singleton[RobotsRegistry],
prototype[LeftLeg],
prototype[RightLeg],
prototype[Robot]
)Inject your robot
val newRobot = injector[Robot]
// New robot 40dc6398-4a28-4b92-8579-403681c9fa92 created
// Robot 40dc6398-4a28-4b92-8579-403681c9fa92 deployed We can switch implementation of singletons and prototypes depends on environment.
class ServerLeftLeg(launcher: ReactiveRocketJump) extends LeftLeg
val injector = configure("robots")(
...
singleton[RobotsRegistry],
prototype[LeftLeg].use[ServerLeftLeg],
prototype[RightLeg],
prototype[Robot]
)In this case injector.Injector will invoke ServerLeftLeg constrictor.
Sometime you need dependency created out of scope of injector.
val injector = configure("robots")(
...
instance(system.executionContext)
)Injector will automatically generate Dot files if dot directory
exists in project root folder.
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