com.mchange.sc.v1.log.MLevel.scala Maven / Gradle / Ivy
/*
* Distributed as part of mlog-scala 0.3.7
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.sc.v1.log;
import scala.util.{Try, Failure};
import language.implicitConversions;
object MLevel {
implicit def toJavaLevel( scalaLevel : MLevel ) : com.mchange.v2.log.MLevel = scalaLevel._level;
implicit def toLoggableOption[T]( maybe : Option[T] ) = new LoggableOption[T]( maybe )
// convenience factories
def mlogger( str : String ) : MLogger = MLogger( str );
def mlogger( clz : Class[_] ) : MLogger = MLogger( clz );
def mlogger( obj : Any ) : MLogger = MLogger( obj );
private[log] def forInner( inner : com.mchange.v2.log.MLevel ) : MLevel = inner match {
case com.mchange.v2.log.MLevel.ALL => ALL
case com.mchange.v2.log.MLevel.CONFIG => CONFIG
case com.mchange.v2.log.MLevel.FINE => FINE
case com.mchange.v2.log.MLevel.FINER => FINER
case com.mchange.v2.log.MLevel.FINEST => FINEST
case com.mchange.v2.log.MLevel.INFO => INFO
case com.mchange.v2.log.MLevel.OFF => OFF
case com.mchange.v2.log.MLevel.SEVERE => SEVERE
case com.mchange.v2.log.MLevel.WARNING => WARNING
}
case object ALL extends MLevel( com.mchange.v2.log.MLevel.ALL );
case object CONFIG extends MLevel( com.mchange.v2.log.MLevel.CONFIG );
case object FINE extends MLevel( com.mchange.v2.log.MLevel.FINE );
case object FINER extends MLevel( com.mchange.v2.log.MLevel.FINER );
case object FINEST extends MLevel( com.mchange.v2.log.MLevel.FINEST );
case object INFO extends MLevel( com.mchange.v2.log.MLevel.INFO );
case object OFF extends MLevel( com.mchange.v2.log.MLevel.OFF );
case object SEVERE extends MLevel( com.mchange.v2.log.MLevel.SEVERE );
case object WARNING extends MLevel( com.mchange.v2.log.MLevel.WARNING );
val DEBUG = FINE;
val TRACE = FINEST;
implicit class LogEvalOps[T]( val expression : T ) extends AnyVal {
def configEval( implicit logger : MLogger ) : T = CONFIG.logEval( expression )( logger )
def fineEval( implicit logger : MLogger ) : T = FINE.logEval( expression )( logger )
def finerEval( implicit logger : MLogger ) : T = FINER.logEval( expression )( logger )
def finestEval( implicit logger : MLogger ) : T = FINEST.logEval( expression )( logger )
def infoEval( implicit logger : MLogger ) : T = INFO.logEval( expression )( logger )
def severeEval( implicit logger : MLogger ) : T = SEVERE.logEval( expression )( logger )
def warningEval( implicit logger : MLogger ) : T = WARNING.logEval( expression )( logger )
def debugEval( implicit logger : MLogger ) : T = DEBUG.logEval( expression )( logger )
def traceEval( implicit logger : MLogger ) : T = TRACE.logEval( expression )( logger )
def logEval( implicit logger : MLogger ) : T = infoEval( logger )
def warnEval( implicit logger : MLogger ) : T = warningEval( logger )
}
}
sealed abstract class MLevel ( private[log] val _level : com.mchange.v2.log.MLevel ) {
private[log] def doIf( op : com.mchange.v2.log.MLevel => Unit )(implicit logger : MLogger) : Unit = if ( logger.inner.isLoggable( _level ) ) op( _level )
def log( message : =>String )( implicit logger : MLogger ) = doIf( logger.inner.log( _, message ) );
def log( message : =>String, error : =>Throwable )( implicit logger : MLogger ) = doIf( logger.inner.log( _, message, error ) );
def logFormat( message : =>String, params : Seq[Any] )( implicit logger : MLogger ) = doIf( logger.inner.log( _, message, params.toArray ) );
def logEval[T]( label : => String )( expression : => T )( implicit logger : MLogger ) : T = {
val expressionValue = expression;
if ( logger.inner.isLoggable( _level ) ) {
val labelValue = label;
val prefix = if ( labelValue == "" ) "" else s"${labelValue}: ";
logger.inner.log( _level, s"${prefix}${expressionValue}" );
expressionValue
} else {
expressionValue
}
}
def logEval[T]( expression : => T )( implicit logger : MLogger ) : T = logEval( "" )( expression )( logger )
// overloading was more trouble than worth, because scalac had a hard time resolving ambiguities if T is a String.
def attemptWithLabel[T]( throwableTag : => String )( expression : => T )( implicit logger : MLogger ) : Try[T] = {
def maybeLog( t : Throwable, failure : Try[T] ) : Try[T] = {
val tt = throwableTag;
if ( logger.inner.isLoggable( _level ) ) {
val prefix = if ( tt == null ) "Handling throwable: " else s"${tt}: ";
logger.inner.log( _level, s"${prefix}", t );
}
failure
}
Try( expression ) match {
case failure @ Failure( t ) => maybeLog( t, failure );
case success @ _ => success;
}
}
def attempt[T]( expression : => T )( implicit logger : MLogger ) : Try[T] = attemptWithLabel(null)( expression )( logger )
// i think the implicit postfix format is better.
//def apply[T]( expression : => T )( implicit logger : MLogger ) : T = logEval( expression )( logger )
}