com.couchbase.spark.Logging.scala Maven / Gradle / Ivy

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package com.couchbase.spark

/**
  * Created by shivansh on 8/8/16.
  */

import org.apache.log4j.{Level, LogManager, PropertyConfigurator}
import org.slf4j.{Logger, LoggerFactory}
import org.slf4j.impl.StaticLoggerBinder

trait Logging {

  @transient private var log_ : Logger = null

  protected def logName = {
    this.getClass.getName.stripSuffix("$")
  }

  protected def log: Logger = {
    if (log_ == null) {
      initializeLogIfNecessary(false)
      log_ = LoggerFactory.getLogger(logName)
    }
    log_
  }

  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)
  }

  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
  }

  protected def initializeLogIfNecessary(isInterpreter: Boolean): Unit = {
    if (!Logging.initialized) {
      Logging.initLock.synchronized {
        if (!Logging.initialized) {
          initializeLogging(isInterpreter)
        }
      }
    }
  }

  def getCouchbaseClassLoader = getClass.getClassLoader

  def getContextOrCouchbaseClassLoader: ClassLoader =
    Option(Thread.currentThread().getContextClassLoader).getOrElse(getCouchbaseClassLoader)

  private def initializeLogging(isInterpreter: Boolean): Unit = {
    val binderClass = StaticLoggerBinder.getSingleton.getLoggerFactoryClassStr
    val usingLog4j12 = "org.slf4j.impl.Log4jLoggerFactory".equals(binderClass)
    if (usingLog4j12) {
      val log4j12Initialized = LogManager.getRootLogger.getAllAppenders.hasMoreElements
      if (!log4j12Initialized) {
        val defaultLogProps = "org/apache/spark/log4j-defaults.properties"
        Option(getClass.getClassLoader.getResource(defaultLogProps)) match {
          case Some(url) =>
            PropertyConfigurator.configure(url)
            System.err.println(s"Using Spark's default log4j profile: $defaultLogProps")
          case None =>
            System.err.println(s"Spark was unable to load $defaultLogProps")
        }
      }

      if (isInterpreter) {
        val rootLogger = LogManager.getRootLogger()
        val replLogger = LogManager.getLogger(logName)
        val replLevel = Option(replLogger.getLevel()).getOrElse(Level.WARN)
        if (replLevel != rootLogger.getEffectiveLevel()) {
          System.err.printf("Setting default log level to \"%s\".\n", replLevel)
          System.err.println("To adjust logging level use sc.setLogLevel(newLevel).")
          rootLogger.setLevel(replLevel)
        }
      }
    }
    Logging.initialized = true
    log
  }
}

private object Logging extends Logging {
  @volatile private var initialized = false
  val initLock = new Object()
  try {
    val bridgeClass = classForName("org.slf4j.bridge.SLF4JBridgeHandler")
    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
  }

  private def classForName(className: String) =
    Class.forName(className, true, getContextOrCouchbaseClassLoader)
}