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|
/*
* =========================================================================================
* Copyright © 2013-2015 the kamon project <http://kamon.io/>
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the
* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific language governing permissions
* and limitations under the License.
* =========================================================================================
*/
package kamon.supervisor
import akka.actor
import akka.actor._
import kamon.Kamon
import kamon.supervisor.KamonSupervisor.CreateModule
import scala.concurrent.{ Promise, Future }
import scala.util.Success
object ModuleSupervisor extends ExtensionId[ModuleSupervisorExtension] with ExtensionIdProvider {
def lookup(): ExtensionId[_ <: actor.Extension] = ModuleSupervisor
def createExtension(system: ExtendedActorSystem): ModuleSupervisorExtension = new ModuleSupervisorExtensionImpl(system)
}
trait ModuleSupervisorExtension extends actor.Extension {
def createModule(name: String, props: Props): Future[ActorRef]
}
class ModuleSupervisorExtensionImpl(system: ExtendedActorSystem) extends ModuleSupervisorExtension {
import system.dispatcher
private val _settings = ModuleSupervisorSettings(system)
private val _supervisor = system.actorOf(KamonSupervisor.props(_settings, system.dynamicAccess), "kamon")
def createModule(name: String, props: Props): Future[ActorRef] = Future {} flatMap { _: Unit ⇒
val modulePromise = Promise[ActorRef]()
_supervisor ! CreateModule(name, props, modulePromise)
modulePromise.future
}
}
class KamonSupervisor(settings: ModuleSupervisorSettings, dynamicAccess: DynamicAccess) extends Actor with ActorLogging {
init()
def receive = {
case CreateModule(name, props, childPromise) ⇒ createChildModule(name, props, childPromise)
}
def createChildModule(name: String, props: Props, childPromise: Promise[ActorRef]): Unit =
context.child(name).map { alreadyAvailableModule ⇒
log.warning("Received a request to create module [{}] but the module is already available, returning the existent instance.")
childPromise.complete(Success(alreadyAvailableModule))
} getOrElse (childPromise.complete(Success(context.actorOf(props, name))))
def init(): Unit = {
if (settings.modulesRequiringAspectJ.nonEmpty && !isAspectJPresent && settings.showAspectJMissingWarning)
logAspectJWeaverMissing(settings.modulesRequiringAspectJ)
// Force initialization of all modules marked with auto-start.
settings.availableModules.filter(_.autoStart).foreach { module ⇒
if (module.extensionClass == "none")
log.debug("Ignoring auto start of the [{}] module with no extension class.")
else
dynamicAccess.getObjectFor[ExtensionId[Kamon.Extension]](module.extensionClass).map { moduleID ⇒
moduleID.get(context.system)
log.debug("Auto starting the [{}] module.", module.name)
} recover {
case th: Throwable ⇒ log.error(th, "Failed to auto start the [{}] module.", module.name)
}
}
}
// When AspectJ is present the kamon.supervisor.AspectJPresent aspect will make this return true.
def isAspectJPresent: Boolean = false
def logAspectJWeaverMissing(modulesRequiringAspectJ: List[AvailableModuleInfo]): Unit = {
val moduleNames = modulesRequiringAspectJ.map(_.name).mkString(", ")
val weaverMissingMessage =
"""
|
| ___ _ ___ _ _ ___ ___ _ _
| / _ \ | | |_ | | | | | | \/ |(_) (_)
|/ /_\ \ ___ _ __ ___ ___ | |_ | | | | | | ___ __ _ __ __ ___ _ __ | . . | _ ___ ___ _ _ __ __ _
|| _ |/ __|| '_ \ / _ \ / __|| __| | | | |/\| | / _ \ / _` |\ \ / // _ \| '__| | |\/| || |/ __|/ __|| || '_ \ / _` |
|| | | |\__ \| |_) || __/| (__ | |_ /\__/ / \ /\ /| __/| (_| | \ V /| __/| | | | | || |\__ \\__ \| || | | || (_| |
|\_| |_/|___/| .__/ \___| \___| \__|\____/ \/ \/ \___| \__,_| \_/ \___||_| \_| |_/|_||___/|___/|_||_| |_| \__, |
| | | __/ |
| |_| |___/
|
| It seems like your application was not started with the -javaagent:/path-to-aspectj-weaver.jar option but Kamon detected
| the following modules which require AspecJ to work properly:
|
""".stripMargin + moduleNames +
"""
|
| If you need help on setting up the aspectj weaver go to http://kamon.io/introduction/get-started/ for more info. On the
| other hand, if you are sure that you do not need or do not want to use the weaver then you can disable this error message
| by changing the kamon.show-aspectj-missing-warning setting in your configuration file.
|
""".stripMargin
log.error(weaverMissingMessage)
}
}
object KamonSupervisor {
case class CreateModule(name: String, props: Props, childPromise: Promise[ActorRef])
def props(settings: ModuleSupervisorSettings, dynamicAccess: DynamicAccess): Props =
Props(new KamonSupervisor(settings, dynamicAccess))
}
|
