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/**
* Copyright (C) 2009-2011 Scalable Solutions AB <http://scalablesolutions.se>
*/
package akka.util
import akka.dispatch.{ Future, CompletableFuture, MessageInvocation }
import akka.config.{ Config, ModuleNotAvailableException }
import java.net.InetSocketAddress
import akka.remoteinterface.RemoteSupport
import akka.actor._
import akka.event.EventHandler
/**
* Helper class for reflective access to different modules in order to allow optional loading of modules.
*
* @author <a href="http://jonasboner.com">Jonas Bonér</a>
*/
object ReflectiveAccess {
val loader = getClass.getClassLoader
def isRemotingEnabled = Remote.isEnabled
lazy val isTypedActorEnabled = TypedActorModule.isEnabled
def ensureRemotingEnabled = Remote.ensureEnabled
def ensureTypedActorEnabled = TypedActorModule.ensureEnabled
/**
* Reflective access to the RemoteClient module.
*
* @author <a href="http://jonasboner.com">Jonas Bonér</a>
*/
object Remote {
val TRANSPORT = Config.config.getString("akka.remote.layer", "akka.remote.netty.NettyRemoteSupport")
private[akka] val configDefaultAddress =
new InetSocketAddress(Config.config.getString("akka.remote.server.hostname", "localhost"),
Config.config.getInt("akka.remote.server.port", 2552))
lazy val isEnabled = remoteSupportClass.isDefined
def ensureEnabled = if (!isEnabled) {
val e = new ModuleNotAvailableException("Can't load the remoting module, make sure that akka-remote.jar is on the classpath")
EventHandler.debug(this, e.toString)
throw e
}
val remoteSupportClass = getClassFor[RemoteSupport](TRANSPORT) match {
case Right(value) => Some(value)
case Left(exception) =>
EventHandler.debug(this, exception.toString)
None
}
protected[akka] val defaultRemoteSupport: Option[() => RemoteSupport] =
remoteSupportClass map { remoteClass =>
() => createInstance[RemoteSupport](
remoteClass,
Array[Class[_]](),
Array[AnyRef]()) match {
case Right(value) => value
case Left(exception) =>
val e = new ModuleNotAvailableException(
"Can't instantiate [%s] - make sure that akka-remote.jar is on the classpath".format(remoteClass.getName), exception)
EventHandler.debug(this, e.toString)
throw e
}
}
}
/**
* Reflective access to the TypedActors module.
*
* @author <a href="http://jonasboner.com">Jonas Bonér</a>
*/
object TypedActorModule {
type TypedActorObject = {
def isJoinPoint(message: Any): Boolean
def isJoinPointAndOneWay(message: Any): Boolean
def actorFor(proxy: AnyRef): Option[ActorRef]
def proxyFor(actorRef: ActorRef): Option[AnyRef]
def stop(anyRef: AnyRef): Unit
}
lazy val isEnabled = typedActorObjectInstance.isDefined
def ensureEnabled = if (!isTypedActorEnabled) throw new ModuleNotAvailableException(
"Can't load the typed actor module, make sure that akka-typed-actor.jar is on the classpath")
val typedActorObjectInstance: Option[TypedActorObject] =
getObjectFor[TypedActorObject]("akka.actor.TypedActor$") match {
case Right(value) => Some(value)
case Left(exception) =>
EventHandler.debug(this, exception.toString)
None
}
def resolveFutureIfMessageIsJoinPoint(message: Any, future: Future[_]): Boolean = {
ensureEnabled
if (typedActorObjectInstance.get.isJoinPointAndOneWay(message)) {
future.asInstanceOf[CompletableFuture[Option[_]]].completeWithResult(None)
}
typedActorObjectInstance.get.isJoinPoint(message)
}
}
object AkkaCloudModule {
type Mailbox = {
def enqueue(message: MessageInvocation)
def dequeue: MessageInvocation
}
type Serializer = {
def toBinary(obj: AnyRef): Array[Byte]
def fromBinary(bytes: Array[Byte], clazz: Option[Class[_]]): AnyRef
}
lazy val isEnabled = clusterObjectInstance.isDefined
val clusterObjectInstance: Option[AnyRef] =
getObjectFor[AnyRef]("akka.cloud.cluster.Cluster$") match {
case Right(value) => Some(value)
case Left(exception) =>
EventHandler.debug(this, exception.toString)
None
}
val serializerClass: Option[Class[_]] =
getClassFor("akka.serialization.Serializer") match {
case Right(value) => Some(value)
case Left(exception) =>
EventHandler.debug(this, exception.toString)
None
}
def ensureEnabled = if (!isEnabled) throw new ModuleNotAvailableException(
"Feature is only available in Akka Cloud")
}
val noParams = Array[Class[_]]()
val noArgs = Array[AnyRef]()
def createInstance[T](clazz: Class[_],
params: Array[Class[_]],
args: Array[AnyRef]): Either[Exception, T] = try {
assert(clazz ne null)
assert(params ne null)
assert(args ne null)
val ctor = clazz.getDeclaredConstructor(params: _*)
ctor.setAccessible(true)
Right(ctor.newInstance(args: _*).asInstanceOf[T])
} catch {
case e: Exception => Left(e)
}
def createInstance[T](fqn: String,
params: Array[Class[_]],
args: Array[AnyRef],
classloader: ClassLoader = loader): Either[Exception, T] = try {
assert(params ne null)
assert(args ne null)
getClassFor(fqn) match {
case Right(value) =>
val ctor = value.getDeclaredConstructor(params: _*)
ctor.setAccessible(true)
Right(ctor.newInstance(args: _*).asInstanceOf[T])
case Left(exception) => Left(exception) //We could just cast this to Either[Exception, T] but it's ugly
}
} catch {
case e: Exception =>
Left(e)
}
//Obtains a reference to fqn.MODULE$
def getObjectFor[T](fqn: String, classloader: ClassLoader = loader): Either[Exception, T] = try {
getClassFor(fqn) match {
case Right(value) =>
val instance = value.getDeclaredField("MODULE$")
instance.setAccessible(true)
val obj = instance.get(null)
if (obj eq null) Left(new NullPointerException) else Right(obj.asInstanceOf[T])
case Left(exception) => Left(exception) //We could just cast this to Either[Exception, T] but it's ugly
}
} catch {
case e: Exception =>
Left(e)
}
def getClassFor[T](fqn: String, classloader: ClassLoader = loader): Either[Exception, Class[T]] = try {
assert(fqn ne null)
// First, use the specified CL
val first = try {
Right(classloader.loadClass(fqn).asInstanceOf[Class[T]])
} catch {
case c: ClassNotFoundException => Left(c)
}
if (first.isRight) first
else {
// Second option is to use the ContextClassLoader
val second = try {
Right(Thread.currentThread.getContextClassLoader.loadClass(fqn).asInstanceOf[Class[T]])
} catch {
case c: ClassNotFoundException => Left(c)
}
if (second.isRight) second
else {
val third = try {
if (classloader ne loader) Right(loader.loadClass(fqn).asInstanceOf[Class[T]]) else Left(null) //Horrid
} catch {
case c: ClassNotFoundException => Left(c)
}
if (third.isRight) third
else {
try {
Right(Class.forName(fqn).asInstanceOf[Class[T]]) // Last option is Class.forName
} catch {
case c: ClassNotFoundException => Left(c)
}
}
}
}
} catch {
case e: Exception => Left(e)
}
}
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