diff options
Diffstat (limited to 'kamon-core/src/legacy-main/scala/kamon/ModuleLoader.scala')
| -rw-r--r-- | kamon-core/src/legacy-main/scala/kamon/ModuleLoader.scala | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/kamon-core/src/legacy-main/scala/kamon/ModuleLoader.scala b/kamon-core/src/legacy-main/scala/kamon/ModuleLoader.scala new file mode 100644 index 00000000..f1b5f414 --- /dev/null +++ b/kamon-core/src/legacy-main/scala/kamon/ModuleLoader.scala @@ -0,0 +1,128 @@ +/* + * ========================================================================================= + * 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 + +import _root_.akka.actor +import _root_.akka.actor._ +import kamon.util.logger.LazyLogger +import org.aspectj.lang.ProceedingJoinPoint +import org.aspectj.lang.annotation.{Around, Aspect, Pointcut} + +private[kamon] object ModuleLoader extends ExtensionId[ModuleLoaderExtension] with ExtensionIdProvider { + def lookup(): ExtensionId[_ <: actor.Extension] = ModuleLoader + def createExtension(system: ExtendedActorSystem): ModuleLoaderExtension = new ModuleLoaderExtension(system) +} + +private[kamon] class ModuleLoaderExtension(system: ExtendedActorSystem) extends Kamon.Extension { + val log = LazyLogger(getClass) + val settings = ModuleLoaderSettings(system) + + if (settings.modulesRequiringAspectJ.nonEmpty && !isAspectJPresent && settings.showAspectJMissingWarning) + logAspectJWeaverMissing(settings.modulesRequiringAspectJ) + + // Force initialization of all modules marked with auto-start. + settings.availableModules.filter(_.startInfo.nonEmpty).foreach { + case AvailableModuleInfo(name, requiresAJ, Some(ModuleStartInfo(autoStart, extensionClass))) if autoStart ⇒ + + system.dynamicAccess.getObjectFor[ExtensionId[Kamon.Extension]](extensionClass).map { moduleID ⇒ + log.debug(s"Auto starting the [$name] module.") + moduleID.get(system) + + } recover { + case th: Throwable ⇒ log.error(s"Failed to auto start the [$name] module.", th) + } + + case other ⇒ + + } + + // 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 AspectJ 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) + } +} + +private[kamon] case class AvailableModuleInfo(name: String, requiresAspectJ: Boolean, startInfo: Option[ModuleStartInfo]) +private[kamon] case class ModuleStartInfo(autoStart: Boolean, extensionClass: String) +private[kamon] case class ModuleLoaderSettings(showAspectJMissingWarning: Boolean, availableModules: List[AvailableModuleInfo]) { + val modulesRequiringAspectJ = availableModules.filter(_.requiresAspectJ) +} + +private[kamon] object ModuleLoaderSettings { + + def apply(system: ActorSystem): ModuleLoaderSettings = { + import kamon.util.ConfigTools.Syntax + + val config = system.settings.config.getConfig("kamon.modules") + val showAspectJMissingWarning = system.settings.config.getBoolean("kamon.show-aspectj-missing-warning") + + val modules = config.firstLevelKeys + val availableModules = modules.map { moduleName ⇒ + val moduleConfig = config.getConfig(moduleName) + val requiresAspectJ = moduleConfig.getBoolean("requires-aspectj") + + val startInfo = + if (moduleConfig.hasPath("auto-start") && moduleConfig.hasPath("extension-class")) + Some(ModuleStartInfo(moduleConfig.getBoolean("auto-start"), moduleConfig.getString("extension-class"))) + else + None + + AvailableModuleInfo(moduleName, requiresAspectJ, startInfo) + + } toList + + ModuleLoaderSettings(showAspectJMissingWarning, availableModules) + } +} + +@Aspect +private[kamon] class AspectJPresent { + + @Pointcut("execution(* kamon.ModuleLoaderExtension.isAspectJPresent())") + def isAspectJPresentAtModuleSupervisor(): Unit = {} + + @Around("isAspectJPresentAtModuleSupervisor()") + def aroundIsAspectJPresentAtModuleSupervisor(pjp: ProceedingJoinPoint): Boolean = true + +} |