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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.spark.streaming.flume.sink
import org.slf4j.{Logger, LoggerFactory}
/**
* Copy of the org.apache.spark.Logging for being used in the Spark Sink.
* The org.apache.spark.Logging is not used so that all of Spark is not brought
* in as a dependency.
*/
private[sink] trait Logging {
// Make the log field transient so that objects with Logging can
// be serialized and used on another machine
@transient private var _log: Logger = null
// Method to get or create the logger for this object
protected def log: Logger = {
if (_log == null) {
initializeIfNecessary()
var className = this.getClass.getName
// Ignore trailing $'s in the class names for Scala objects
if (className.endsWith("$")) {
className = className.substring(0, className.length - 1)
}
_log = LoggerFactory.getLogger(className)
}
_log
}
// Log methods that take only a String
protected def logInfo(msg: => String) {
if (log.isInfoEnabled) log.info(msg)
}
protected def logDebug(msg: => String) {
if (log.isDebugEnabled) log.debug(msg)
}
protected def logTrace(msg: => String) {
if (log.isTraceEnabled) log.trace(msg)
}
protected def logWarning(msg: => String) {
if (log.isWarnEnabled) log.warn(msg)
}
protected def logError(msg: => String) {
if (log.isErrorEnabled) log.error(msg)
}
// Log methods that take Throwables (Exceptions/Errors) too
protected def logInfo(msg: => String, throwable: Throwable) {
if (log.isInfoEnabled) log.info(msg, throwable)
}
protected def logDebug(msg: => String, throwable: Throwable) {
if (log.isDebugEnabled) log.debug(msg, throwable)
}
protected def logTrace(msg: => String, throwable: Throwable) {
if (log.isTraceEnabled) log.trace(msg, throwable)
}
protected def logWarning(msg: => String, throwable: Throwable) {
if (log.isWarnEnabled) log.warn(msg, throwable)
}
protected def logError(msg: => String, throwable: Throwable) {
if (log.isErrorEnabled) log.error(msg, throwable)
}
protected def isTraceEnabled(): Boolean = {
log.isTraceEnabled
}
private def initializeIfNecessary() {
if (!Logging.initialized) {
Logging.initLock.synchronized {
if (!Logging.initialized) {
initializeLogging()
}
}
}
}
private def initializeLogging() {
Logging.initialized = true
// Force a call into slf4j to initialize it. Avoids this happening from mutliple threads
// and triggering this: http://mailman.qos.ch/pipermail/slf4j-dev/2010-April/002956.html
log
}
}
private[sink] object Logging {
@volatile private var initialized = false
val initLock = new Object()
try {
// We use reflection here to handle the case where users remove the
// slf4j-to-jul bridge order to route their logs to JUL.
// scalastyle:off classforname
val bridgeClass = Class.forName("org.slf4j.bridge.SLF4JBridgeHandler")
// scalastyle:on classforname
bridgeClass.getMethod("removeHandlersForRootLogger").invoke(null)
val installed = bridgeClass.getMethod("isInstalled").invoke(null).asInstanceOf[Boolean]
if (!installed) {
bridgeClass.getMethod("install").invoke(null)
}
} catch {
case e: ClassNotFoundException => // can't log anything yet so just fail silently
}
}
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