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xerial.core.log.Logger.scala Maven / Gradle / Ivy
/*
* Copyright 2012 Taro L. Saito
*
* 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.
*/
//--------------------------------------
//
// Logger.scala
// Since: 2012/07/19 4:23 PM
//
//--------------------------------------
package xerial.core.log
import collection.mutable
import javax.management.{InstanceAlreadyExistsException, MBeanServerConnection, JMX, ObjectName}
import management.ManagementFactory
import javax.management.remote.{JMXConnectorFactory, JMXServiceURL}
import util.DynamicVariable
import java.io.{PrintStream, ByteArrayOutputStream}
import scala.language.postfixOps
/**
* log level definitions
*
* @author Taro L. Saito
*/
object LogLevel extends xerial.core.collection.Enum[LogLevel] {
case object OFF extends LogLevel(0, "off")
case object FATAL extends LogLevel(1, "fatal")
case object ERROR extends LogLevel(2, "error")
case object WARN extends LogLevel(3, "warn")
case object INFO extends LogLevel(4, "info")
case object DEBUG extends LogLevel(5, "debug")
case object TRACE extends LogLevel(6, "trace")
case object ALL extends LogLevel(7, "all")
val values = IndexedSeq(OFF, FATAL, ERROR, WARN, INFO, DEBUG, TRACE, ALL)
private lazy val index = values.map { l => l.name.toLowerCase -> l } toMap
def apply(name: String): LogLevel = {
val n = name.toLowerCase
val lv = values.find(n == _.name)
if (lv.isEmpty) {
Console.err.println("Unknown log level [%s] Use info log level instead." format (name))
INFO
}
else
lv.get
}
def unapply(name:String) : Option[LogLevel] = index.get(name.toLowerCase)
}
sealed abstract class LogLevel(val order: Int, val name: String) extends Ordered[LogLevel] with Serializable {
def compare(other: LogLevel) = this.order - other.order
override def toString = name
}
/**
* Trait for adding logging functions (trace, debug, info, warn, error and fatal) to your class.
*/
trait Logger extends Serializable {
private[this] def logger = LoggerFactory(this.getClass)
def log(logLevel: LogLevel, message: => Any): Unit = {
if (logger.isEnabled(logLevel))
logger.log(logLevel, message)
}
/**
* Create a sub logger with a given tag name
* @param tag
* @return
*/
protected def getLogger(tag: Symbol): LogWriter = LoggerFactory(logger, tag)
/**
* Create a sub logger with a given tag name
* @param tag
* @return
*/
protected def getLogger(tag: String): LogWriter = getLogger(Symbol(tag))
protected def log[U](tag: String)(f: LogWriter => U) {
f(getLogger(tag))
}
protected def fatal(message: => Any): Unit = log(LogLevel.FATAL, message)
protected def error(message: => Any): Unit = log(LogLevel.ERROR, message)
protected def warn(message: => Any): Unit = log(LogLevel.WARN, message)
protected def info(message: => Any): Unit = log(LogLevel.INFO, message)
protected def debug(message: => Any): Unit = log(LogLevel.DEBUG, message)
protected def trace(message: => Any): Unit = log(LogLevel.TRACE, message)
}
/**
* Add support for formatted log
*/
trait LogHelper {
import LogLevel._
def log(logLevel: LogLevel, message: => Any): Unit
def fatal(message: => Any): Unit = log(FATAL, message)
def error(message: => Any): Unit = log(ERROR, message)
def warn(message: => Any): Unit = log(WARN, message)
def info(message: => Any): Unit = log(INFO, message)
def debug(message: => Any): Unit = log(DEBUG, message)
def trace(message: => Any): Unit = log(TRACE, message)
}
/**
* Interface of log writers
* @author leo
*/
trait LogWriter extends LogHelper with Serializable {
var logLevel: LogLevel
val name: String
val shortName = LoggerFactory.leafName(name)
def tag = {
val pos = shortName.lastIndexOf(":")
if (pos == -1)
""
else
shortName.substring(pos + 1)
}
def prefix : String = {
val pos = name.lastIndexOf(":")
if(pos == -1) name else name.substring(0, pos)
}
def isEnabled(targetLogLevel: LogLevel): Boolean = targetLogLevel <= logLevel
/**
* Generate log message
* @param level
* @param message
* @return true if log is generated, or false when log is suppressed
*/
def log(level: LogLevel, message: => Any): Unit = {
if (isEnabled(level))
write(level, message)
}
protected def write(level: LogLevel, message: Any)
}
object LoggerFactory {
private[log] var defaultLogLevel: LogLevel = LogLevel(System.getProperty("loglevel", "info"))
private val rootLoggerName = "root"
val rootLogger = new ConsoleLogWriter(rootLoggerName, defaultLogLevel)
/**
* Hold logger instances in weakly referenced hash map to allow releasing instances when necessary
*/
private val loggerHolder = new mutable.WeakHashMap[String, LogWriter]
def apply(cl: Class[_]): LogWriter = getLogger(cl.getName)
def apply(name: String): LogWriter = getLogger(name)
def apply(logger: LogWriter, symbol: Symbol): LogWriter = getLogger(logger.name + ":" + symbol.name)
def apply(cl: Class[_], symbol: Symbol): LogWriter = apply(apply(cl), symbol)
def getDefaultLogLevel(loggerName:String) : LogLevel ={
def property(key:String) : Option[String] = Option(System.getProperty(key))
def parents : Seq[String] = {
val c = loggerName.split("\\.")
val p = for(i <- 1 until c.length) yield {
c.take(i).mkString(".")
}
p.reverse
}
val l = Seq(loggerName, leafName(loggerName)) ++ parents
val ll : Option[String] = (for(k <- l.map(x => s"loglevel:$x"); prop <- property(k)) yield prop).headOption
ll.map(LogLevel(_)).getOrElse(defaultLogLevel)
}
/**
* Get the logger of the specified name. LogWriter names are
* dot-separated list as of the package names.
* This naming should be the same with java package/class naming convention.
*/
private def getLogger(name: String): LogWriter = {
def property(key: String) = Option(System.getProperty(key))
if (name.isEmpty)
rootLogger
else {
synchronized {
val dl = getDefaultLogLevel(name)
loggerHolder.getOrElseUpdate(name, new ConsoleLogWriter(name, dl))
}
}
}
def leafName(name: String) = name.split( """[\.]""").last
private val configMBeanName = new ObjectName("xerial.core.util:type=LoggerConfig")
{
val server = ManagementFactory.getPlatformMBeanServer
try {
if(!server.isRegistered(configMBeanName))
server.registerMBean(new LoggerConfigImpl, configMBeanName)
}
catch {
case e: InstanceAlreadyExistsException => // OK
case e: Exception => e.printStackTrace()
}
}
def setLogLevelJMX(loggerName:String, logLevel:String) {
val lc = JMX.newMBeanProxy(ManagementFactory.getPlatformMBeanServer, configMBeanName, classOf[LoggerConfig], true)
lc.setLogLevel(loggerName, logLevel)
}
def setLogLevelJMX(server:MBeanServerConnection, loggerName:String, logLevel:String) {
val lc = JMX.newMBeanProxy(server, configMBeanName, classOf[LoggerConfig], true)
lc.setLogLevel(loggerName, logLevel)
rootLogger.debug(s"Set the loglevel of $loggerName to $logLevel")
}
def setDefaultLogLevelJMX(server:MBeanServerConnection, logLevel:String) {
val lc = JMX.newMBeanProxy(server, configMBeanName, classOf[LoggerConfig], true)
lc.setDefaultLogLevel(logLevel)
rootLogger.debug(s"Set the default loglevel to $logLevel")
}
def getJMXServerAddress(pid:Int) : Option[String] = {
Option(sun.management.ConnectorAddressLink.importFrom(pid))
}
/**
*
*/
private def getJMXServer(pid:Int) : Option[MBeanServerConnection] = {
rootLogger.info(s"Searching for JMX server pid:$pid")
val addr = getJMXServerAddress(pid)
val server : Option[MBeanServerConnection] = addr.map{ a =>
JMXConnectorFactory.connect(new JMXServiceURL(a))
} map (_.getMBeanServerConnection)
if(server.isEmpty)
rootLogger.warn(s"No JMX server (pid:$pid) is found")
else {
rootLogger.info(s"Found a JMX server (pid:$pid)")
rootLogger.debug(s"Server address: ${addr.get}")
}
server
}
def setLogLevel(pid:Int, loggerName:String, logLevel:String) {
for(server <- getJMXServer(pid)) {
setLogLevelJMX(server, loggerName, logLevel)
}
}
def setDefaultLogLevel(pid:Int, logLevel:String) {
for(server <- getJMXServer(pid)) {
setDefaultLogLevelJMX(server, logLevel)
}
}
def setDefaultLogLevel(logLevel:LogLevel) {
System.setProperty("loglevel", logLevel.name)
LoggerFactory.defaultLogLevel = logLevel
LoggerFactory.rootLogger.debug(s"Set the default log level to $logLevel")
}
def getDefaultLogLevel = defaultLogLevel
}
import javax.management.MXBean
/**
* LogWriter configuration API
* @author leo
*/
@MXBean abstract trait LoggerConfig {
def setLogLevel(name: String, logLevel: String): Unit
def setDefaultLogLevel(logLevel:String) : Unit
def getDefaultLogLevel : String
}
class LoggerConfigImpl extends LoggerConfig {
def getDefaultLogLevel = LoggerFactory.defaultLogLevel.toString
def setLogLevel(loggerName: String, logLevel: String) {
System.setProperty("loglevel:%s".format(loggerName), logLevel)
val logger = LoggerFactory.apply(loggerName)
val level = LogLevel(logLevel)
logger.logLevel = level
LoggerFactory.rootLogger.info(s"set the log level of $loggerName to $level")
}
def setDefaultLogLevel(logLevel:String) {
val level = LogLevel(logLevel)
LoggerFactory.setDefaultLogLevel(level)
}
}
/**
* Empty log writer
*/
trait NullLogWriter extends LogWriter {
protected def write(level: LogLevel, message: Any) {}
}
/**
* LogWriter for string messages
*/
trait StringLogWriter extends LogWriter {
def write(level: LogLevel, message: Any) = write(level, formatLog(level, message))
/**
* Override this method to customize the log format
* @param message
* @return
*/
protected def formatLog(logLevel:LogLevel, message: Any): String = {
def isMultiLine(str: String) = str.contains("\n")
val s = new StringBuilder
s.append("[")
s.append(shortName)
s.append("] ")
def errorString(e:Throwable) = {
val buf = new ByteArrayOutputStream()
val pout = new PrintStream(buf)
e.printStackTrace(pout)
pout.close
buf.toString
}
val m = message match {
case null => ""
case e:Error => errorString(e)
case e:Exception => errorString(e)
case _ => message.toString
}
if (isMultiLine(m))
s.append("\n")
s.append(m)
s.toString
}
protected def write(level: LogLevel, message: String) = Console.err.println(message)
}
object ConsoleLogWriter {
import LogLevel._
val colorPrefix = Map[LogLevel, String](
ALL -> "",
TRACE -> Console.GREEN,
DEBUG -> Console.WHITE,
INFO -> Console.CYAN,
WARN -> Console.YELLOW,
ERROR -> Console.MAGENTA,
FATAL -> Console.RED,
OFF -> "")
}
/**
* Log writer using console
* @param name
* @param logLevel
*/
class ConsoleLogWriter(val name: String, var logLevel: LogLevel) extends StringLogWriter {
override protected def formatLog(level:LogLevel, message: Any) = {
"%s%s%s".format(ConsoleLogWriter.colorPrefix(level), super.formatLog(level, message), Console.RESET)
}
override protected def write(level: LogLevel, message: String) = Console.err.println(message)
}
