Boot.scala
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	package net.shrine.metadata

	import akka.actor.{ActorRef, ActorSystem, Props}
	import akka.routing.RoundRobinPool
	import net.shrine.problem.ProblemHandler
	import net.shrine.source.ConfigSource
	import spray.servlet.WebBoot

	import scala.util.control.NonFatal

	/**
	* Created by ty on 11/8/16.
	*/
	// this class is instantiated by the servlet initializer
	// it needs to have a default constructor and implement
	// the spray.servlet.WebBoot trait
	class Boot extends WebBoot {

	// we need an ActorSystem to host our application in
	override val system = startActorSystem()

	// the service actor replies to incoming HttpRequests
	override val serviceActor: ActorRef = startServiceActor()

	def startActorSystem() = try ActorSystem("ShrineActors",ConfigSource.config)
	catch {
	case NonFatal(x) => CannotStartMetaData(x); throw x
	case x: ExceptionInInitializerError => CannotStartMetaData(x); throw x
	}

	def startServiceActor(): ActorRef = try {
	//TODO: create a common interface for Problems to hide behind, so that it doesn't exist anywhere in the code
	//TODO: except for when brought into scope
	val handler:ProblemHandler = ConfigSource.getObject("shrine.problem.problemHandler", ConfigSource.config)
	handler.warmUp()

	// the service actor replies to incoming HttpRequests
	system.actorOf(RoundRobinPool(100).props(Props[MetaDataActor]), "MetaDataActors")
	}
	catch {
	case NonFatal(x) => CannotStartMetaData(x); throw x
	case x: ExceptionInInitializerError => CannotStartMetaData(x); throw x
	}

	}