1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/**
* 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)
}
}
}
|