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/**
* Copyright (C) 2009-2011 Scalable Solutions AB <http://scalablesolutions.se>
*/
package akka.event
import akka.actor._
import akka.config.Config._
import akka.config.ConfigurationException
import akka.util.{ ListenerManagement, ReflectiveAccess }
import akka.AkkaException
/**
* Event handler.
* <p/>
* Create, add and remove a listener:
* <pre>
* val eventHandlerListener = Actor.actorOf(new Actor {
* self.dispatcher = EventHandler.EventHandlerDispatcher
*
* def receive = {
* case EventHandler.Error(cause, instance, message) => ...
* case EventHandler.Warning(instance, message) => ...
* case EventHandler.Info(instance, message) => ...
* case EventHandler.Debug(instance, message) => ...
* case genericEvent => ...
* }
* })
*
* EventHandler.addListener(eventHandlerListener)
* ...
* EventHandler.removeListener(eventHandlerListener)
* </pre>
* <p/>
* However best is probably to register the listener in the 'akka.conf'
* configuration file.
* <p/>
* Log an error event:
* <pre>
* EventHandler.notify(EventHandler.Error(exception, this, message))
* </pre>
* Or use the direct methods (better performance):
* <pre>
* EventHandler.error(exception, this, message)
* </pre>
*
* Shut down the EventHandler:
* <pre>
* EventHandler.shutdown()
* </pre>
*
* @author <a href="http://jonasboner.com">Jonas Bonér</a>
*/
object EventHandler extends ListenerManagement {
import java.io.{ StringWriter, PrintWriter }
import java.text.DateFormat
import java.util.Date
import akka.dispatch.Dispatchers
val ErrorLevel = 1
val WarningLevel = 2
val InfoLevel = 3
val DebugLevel = 4
sealed trait Event {
@transient
val thread: Thread = Thread.currentThread
val level: Int
}
case class Error(cause: Throwable, instance: AnyRef, message: Any = "") extends Event {
override val level = ErrorLevel
}
case class Warning(instance: AnyRef, message: Any = "") extends Event {
override val level = WarningLevel
}
case class Info(instance: AnyRef, message: Any = "") extends Event {
override val level = InfoLevel
}
case class Debug(instance: AnyRef, message: Any = "") extends Event {
override val level = DebugLevel
}
val error = "[ERROR] [%s] [%s] [%s] %s\n%s".intern
val warning = "[WARN] [%s] [%s] [%s] %s".intern
val info = "[INFO] [%s] [%s] [%s] %s".intern
val debug = "[DEBUG] [%s] [%s] [%s] %s".intern
val generic = "[GENERIC] [%s] [%s]".intern
val ID = "event:handler".intern
class EventHandlerException extends AkkaException
lazy val EventHandlerDispatcher = Dispatchers.newExecutorBasedEventDrivenDispatcher(ID).build
val level: Int = config.getString("akka.event-handler-level", "INFO") match {
case "ERROR" => ErrorLevel
case "WARNING" => WarningLevel
case "INFO" => InfoLevel
case "DEBUG" => DebugLevel
case unknown => throw new ConfigurationException(
"Configuration option 'akka.event-handler-level' is invalid [" + unknown + "]")
}
/**
* Shuts down all event handler listeners including the event handle dispatcher.
*/
def shutdown() {
foreachListener(_.stop())
EventHandlerDispatcher.shutdown()
}
def notify(event: Any) {
if (event.isInstanceOf[Event]) {
if (level >= event.asInstanceOf[Event].level) notifyListeners(event)
} else
notifyListeners(event)
}
def notify[T <: Event: ClassTag](event: => T) {
if (level >= levelFor(classTag[T].erasure.asInstanceOf[Class[_ <: Event]])) notifyListeners(event)
}
def error(cause: Throwable, instance: AnyRef, message: => String) {
if (level >= ErrorLevel) notifyListeners(Error(cause, instance, message))
}
def error(cause: Throwable, instance: AnyRef, message: Any) {
if (level >= ErrorLevel) notifyListeners(Error(cause, instance, message))
}
def error(instance: AnyRef, message: => String) {
if (level >= ErrorLevel) notifyListeners(Error(new EventHandlerException, instance, message))
}
def error(instance: AnyRef, message: Any) {
if (level >= ErrorLevel) notifyListeners(Error(new EventHandlerException, instance, message))
}
def warning(instance: AnyRef, message: => String) {
if (level >= WarningLevel) notifyListeners(Warning(instance, message))
}
def warning(instance: AnyRef, message: Any) {
if (level >= WarningLevel) notifyListeners(Warning(instance, message))
}
def info(instance: AnyRef, message: => String) {
if (level >= InfoLevel) notifyListeners(Info(instance, message))
}
def info(instance: AnyRef, message: Any) {
if (level >= InfoLevel) notifyListeners(Info(instance, message))
}
def debug(instance: AnyRef, message: => String) {
if (level >= DebugLevel) notifyListeners(Debug(instance, message))
}
def debug(instance: AnyRef, message: Any) {
if (level >= DebugLevel) notifyListeners(Debug(instance, message))
}
def isInfoEnabled = level >= InfoLevel
def isDebugEnabled = level >= DebugLevel
def formattedTimestamp = DateFormat.getInstance.format(new Date)
def stackTraceFor(e: Throwable) = {
val sw = new StringWriter
val pw = new PrintWriter(sw)
e.printStackTrace(pw)
sw.toString
}
private def levelFor(eventClass: Class[_ <: Event]) = {
if (eventClass.isInstanceOf[Error]) ErrorLevel
else if (eventClass.isInstanceOf[Warning]) WarningLevel
else if (eventClass.isInstanceOf[Info]) InfoLevel
else if (eventClass.isInstanceOf[Debug]) DebugLevel
else DebugLevel
}
class DefaultListener extends Actor {
self.id = ID
self.dispatcher = EventHandlerDispatcher
def receive = {
case event@Error(cause, instance, message) =>
println(error.format(
formattedTimestamp,
event.thread.getName,
instance.getClass.getSimpleName,
message,
stackTraceFor(cause)))
case event@Warning(instance, message) =>
println(warning.format(
formattedTimestamp,
event.thread.getName,
instance.getClass.getSimpleName,
message))
case event@Info(instance, message) =>
println(info.format(
formattedTimestamp,
event.thread.getName,
instance.getClass.getSimpleName,
message))
case event@Debug(instance, message) =>
println(debug.format(
formattedTimestamp,
event.thread.getName,
instance.getClass.getSimpleName,
message))
case event =>
println(generic.format(formattedTimestamp, event.toString))
}
}
val defaultListeners = config.getList("akka.event-handlers") match {
case Nil => "akka.event.EventHandler$DefaultListener" :: Nil
case listeners => listeners
}
defaultListeners foreach { listenerName =>
try {
ReflectiveAccess.getClassFor[Actor](listenerName) match {
case r: Right[_, Class[Actor]] => addListener(Actor.actorOf(r.b).start())
case l: Left[Exception, _] => throw l.a
}
} catch {
case e: Exception =>
throw new ConfigurationException(
"Event Handler specified in config can't be loaded [" + listenerName +
"] due to [" + e.toString + "]", e)
}
}
}
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