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/**
* Copyright (C) 2009-2014 Typesafe Inc.
*/
package akka.actor.dungeon
import scala.annotation.tailrec
import scala.util.control.NonFatal
import scala.collection.immutable
import akka.actor._
import akka.serialization.SerializationExtension
import akka.util.{ Unsafe, Helpers }
private[akka] trait Children { this: ActorCell ⇒
import ChildrenContainer._
@volatile
private var _childrenRefsDoNotCallMeDirectly: ChildrenContainer = EmptyChildrenContainer
def childrenRefs: ChildrenContainer =
Unsafe.instance.getObjectVolatile(this, AbstractActorCell.childrenOffset).asInstanceOf[ChildrenContainer]
final def children: immutable.Iterable[ActorRef] = childrenRefs.children
final def getChildren(): java.lang.Iterable[ActorRef] =
scala.collection.JavaConverters.asJavaIterableConverter(children).asJava
final def child(name: String): Option[ActorRef] = Option(getChild(name))
final def getChild(name: String): ActorRef = childrenRefs.getByName(name) match {
case Some(s: ChildRestartStats) ⇒ s.child
case _ ⇒ null
}
def actorOf(props: Props): ActorRef =
makeChild(this, props, randomName(), async = false, systemService = false)
def actorOf(props: Props, name: String): ActorRef =
makeChild(this, props, checkName(name), async = false, systemService = false)
private[akka] def attachChild(props: Props, systemService: Boolean): ActorRef =
makeChild(this, props, randomName(), async = true, systemService = systemService)
private[akka] def attachChild(props: Props, name: String, systemService: Boolean): ActorRef =
makeChild(this, props, checkName(name), async = true, systemService = systemService)
@volatile private var _nextNameDoNotCallMeDirectly = 0L
final protected def randomName(): String = {
@tailrec def inc(): Long = {
val current = Unsafe.instance.getLongVolatile(this, AbstractActorCell.nextNameOffset)
if (Unsafe.instance.compareAndSwapLong(this, AbstractActorCell.nextNameOffset, current, current + 1)) current
else inc()
}
Helpers.base64(inc())
}
final def stop(actor: ActorRef): Unit = {
if (childrenRefs.getByRef(actor).isDefined) {
@tailrec def shallDie(ref: ActorRef): Boolean = {
val c = childrenRefs
swapChildrenRefs(c, c.shallDie(ref)) || shallDie(ref)
}
if (actor match {
case r: RepointableRef ⇒ r.isStarted
case _ ⇒ true
}) shallDie(actor)
}
actor.asInstanceOf[InternalActorRef].stop()
}
/*
* low level CAS helpers
*/
@inline private final def swapChildrenRefs(oldChildren: ChildrenContainer, newChildren: ChildrenContainer): Boolean =
Unsafe.instance.compareAndSwapObject(this, AbstractActorCell.childrenOffset, oldChildren, newChildren)
@tailrec final def reserveChild(name: String): Boolean = {
val c = childrenRefs
swapChildrenRefs(c, c.reserve(name)) || reserveChild(name)
}
@tailrec final protected def unreserveChild(name: String): Boolean = {
val c = childrenRefs
swapChildrenRefs(c, c.unreserve(name)) || unreserveChild(name)
}
@tailrec final def initChild(ref: ActorRef): Option[ChildRestartStats] = {
val cc = childrenRefs
cc.getByName(ref.path.name) match {
case old @ Some(_: ChildRestartStats) ⇒ old.asInstanceOf[Option[ChildRestartStats]]
case Some(ChildNameReserved) ⇒
val crs = ChildRestartStats(ref)
val name = ref.path.name
if (swapChildrenRefs(cc, cc.add(name, crs))) Some(crs) else initChild(ref)
case None ⇒ None
}
}
@tailrec final protected def setChildrenTerminationReason(reason: ChildrenContainer.SuspendReason): Boolean = {
childrenRefs match {
case c: ChildrenContainer.TerminatingChildrenContainer ⇒
swapChildrenRefs(c, c.copy(reason = reason)) || setChildrenTerminationReason(reason)
case _ ⇒ false
}
}
final protected def setTerminated(): Unit = Unsafe.instance.putObjectVolatile(this, AbstractActorCell.childrenOffset, TerminatedChildrenContainer)
/*
* ActorCell-internal API
*/
protected def isNormal = childrenRefs.isNormal
protected def isTerminating = childrenRefs.isTerminating
protected def waitingForChildrenOrNull = childrenRefs match {
case TerminatingChildrenContainer(_, _, w: WaitingForChildren) ⇒ w
case _ ⇒ null
}
protected def suspendChildren(exceptFor: Set[ActorRef] = Set.empty): Unit =
childrenRefs.stats foreach {
case ChildRestartStats(child, _, _) if !(exceptFor contains child) ⇒ child.asInstanceOf[InternalActorRef].suspend()
case _ ⇒
}
protected def resumeChildren(causedByFailure: Throwable, perp: ActorRef): Unit =
childrenRefs.stats foreach {
case ChildRestartStats(child: InternalActorRef, _, _) ⇒
child.resume(if (perp == child) causedByFailure else null)
}
def getChildByName(name: String): Option[ChildStats] = childrenRefs.getByName(name)
protected def getChildByRef(ref: ActorRef): Option[ChildRestartStats] = childrenRefs.getByRef(ref)
protected def getAllChildStats: immutable.Iterable[ChildRestartStats] = childrenRefs.stats
override def getSingleChild(name: String): InternalActorRef =
if (name.indexOf('#') == -1) {
// optimization for the non-uid case
getChildByName(name) match {
case Some(crs: ChildRestartStats) ⇒ crs.child.asInstanceOf[InternalActorRef]
case _ ⇒ Nobody
}
} else {
val (childName, uid) = ActorCell.splitNameAndUid(name)
getChildByName(childName) match {
case Some(crs: ChildRestartStats) if uid == ActorCell.undefinedUid || uid == crs.uid ⇒
crs.child.asInstanceOf[InternalActorRef]
case _ ⇒ Nobody
}
}
protected def removeChildAndGetStateChange(child: ActorRef): Option[SuspendReason] = {
@tailrec def removeChild(ref: ActorRef): ChildrenContainer = {
val c = childrenRefs
val n = c.remove(ref)
if (swapChildrenRefs(c, n)) n else removeChild(ref)
}
childrenRefs match { // The match must be performed BEFORE the removeChild
case TerminatingChildrenContainer(_, _, reason) ⇒
removeChild(child) match {
case _: TerminatingChildrenContainer ⇒ None
case _ ⇒ Some(reason)
}
case _ ⇒
removeChild(child)
None
}
}
/*
* Private helpers
*/
private def checkName(name: String): String = {
name match {
case null ⇒ throw new InvalidActorNameException("actor name must not be null")
case "" ⇒ throw new InvalidActorNameException("actor name must not be empty")
case _ if ActorPath.isValidPathElement(name) ⇒ name
case _ ⇒ throw new InvalidActorNameException(s"Illegal actor name [$name]. Actor paths MUST: not start with `$$`, include only ASCII letters and can only contain these special characters: ${ActorPath.ValidSymbols}.")
}
}
private def makeChild(cell: ActorCell, props: Props, name: String, async: Boolean, systemService: Boolean): ActorRef = {
if (cell.system.settings.SerializeAllCreators && !systemService && props.deploy.scope != LocalScope)
try {
val ser = SerializationExtension(cell.system)
props.args forall (arg ⇒
arg.isInstanceOf[NoSerializationVerificationNeeded] ||
ser.deserialize(ser.serialize(arg.asInstanceOf[AnyRef]).get, arg.getClass).get != null)
} catch {
case NonFatal(e) ⇒ throw new IllegalArgumentException(s"pre-creation serialization check failed at [${cell.self.path}/$name]", e)
}
/*
* in case we are currently terminating, fail external attachChild requests
* (internal calls cannot happen anyway because we are suspended)
*/
if (cell.childrenRefs.isTerminating) throw new IllegalStateException("cannot create children while terminating or terminated")
else {
reserveChild(name)
// this name will either be unreserved or overwritten with a real child below
val actor =
try {
val childPath = new ChildActorPath(cell.self.path, name, ActorCell.newUid())
cell.provider.actorOf(cell.systemImpl, props, cell.self, childPath,
systemService = systemService, deploy = None, lookupDeploy = true, async = async)
} catch {
case e: InterruptedException ⇒
unreserveChild(name)
Thread.interrupted() // clear interrupted flag before throwing according to java convention
throw e
case NonFatal(e) ⇒
unreserveChild(name)
throw e
}
// mailbox==null during RoutedActorCell constructor, where suspends are queued otherwise
if (mailbox ne null) for (_ ← 1 to mailbox.suspendCount) actor.suspend()
initChild(actor)
actor.start()
actor
}
}
}
