2010-09-29 02:12:23 -04:00
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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
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* for the class and allows logging messages at different levels using
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* methods that only evaluate parameters lazily if the 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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2010-09-29 03:10:46 -04:00
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// Method to get or create the logger for this object
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2010-09-29 02:12:23 -04:00
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def log: Logger = {
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2010-09-29 03:10:46 -04:00
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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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log_ = LoggerFactory.getLogger(className)
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}
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2010-09-29 02:12:23 -04:00
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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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def logInfo(msg: => String) = if (log.isInfoEnabled) log.info(msg)
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def logDebug(msg: => String) = if (log.isDebugEnabled) log.debug(msg)
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def logWarning(msg: => String) = if (log.isWarnEnabled) log.warn(msg)
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def logError(msg: => String) = if (log.isErrorEnabled) log.error(msg)
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// Log methods that take Throwables (Exceptions/Errors) too
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def logInfo(msg: => String, throwable: Throwable) =
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if (log.isInfoEnabled) log.info(msg)
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def logDebug(msg: => String, throwable: Throwable) =
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if (log.isDebugEnabled) log.debug(msg)
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def logWarning(msg: => String, throwable: Throwable) =
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if (log.isWarnEnabled) log.warn(msg, throwable)
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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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