75 lines
2.2 KiB
Scala
75 lines
2.2 KiB
Scala
package spark
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import org.slf4j.Logger
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import org.slf4j.LoggerFactory
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/**
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* Utility trait for classes that want to log data. Creates a SLF4J logger for the class and allows
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* logging messages at different levels using methods that only evaluate parameters lazily if the
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* log level is enabled.
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*/
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trait Logging {
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// Make the log field transient so that objects with Logging can
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// be serialized and used on another machine
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@transient private var log_ : Logger = null
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// Method to get or create the logger for this object
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protected def log: Logger = {
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if (log_ == null) {
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var className = this.getClass.getName
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// Ignore trailing $'s in the class names for Scala objects
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if (className.endsWith("$")) {
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className = className.substring(0, className.length - 1)
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}
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log_ = LoggerFactory.getLogger(className)
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}
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return log_
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}
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// Log methods that take only a String
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protected def logInfo(msg: => String) {
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if (log.isInfoEnabled) log.info(msg)
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}
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protected def logDebug(msg: => String) {
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if (log.isDebugEnabled) log.debug(msg)
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}
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protected def logTrace(msg: => String) {
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if (log.isTraceEnabled) log.trace(msg)
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}
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protected def logWarning(msg: => String) {
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if (log.isWarnEnabled) log.warn(msg)
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}
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protected def logError(msg: => String) {
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if (log.isErrorEnabled) log.error(msg)
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}
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// Log methods that take Throwables (Exceptions/Errors) too
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protected def logInfo(msg: => String, throwable: Throwable) {
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if (log.isInfoEnabled) log.info(msg, throwable)
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}
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protected def logDebug(msg: => String, throwable: Throwable) {
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if (log.isDebugEnabled) log.debug(msg, throwable)
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}
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protected def logTrace(msg: => String, throwable: Throwable) {
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if (log.isTraceEnabled) log.trace(msg, throwable)
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}
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protected def logWarning(msg: => String, throwable: Throwable) {
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if (log.isWarnEnabled) log.warn(msg, throwable)
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}
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protected def logError(msg: => String, throwable: Throwable) {
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if (log.isErrorEnabled) log.error(msg, throwable)
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}
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// Method for ensuring that logging is initialized, to avoid having multiple
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// threads do it concurrently (as SLF4J initialization is not thread safe).
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protected def initLogging() { log }
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}
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