Module org.apache.log
Package org.apache.log

Class Logger

  • public class Logger
extends java.lang.Object
    The object interacted with by client objects to perform logging.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static char CATEGORY_SEPARATOR
      Separator character use to separate different categories

    • Method Summary

      Modifier and Type Method Description
      void debug​(java.lang.String message)
      Log a debug priority event.
      void debug​(java.lang.String message, java.lang.Throwable throwable)
      Log a debug priority event.
      void error​(java.lang.String message)
      Log a error priority event.
      void error​(java.lang.String message, java.lang.Throwable throwable)
      Log a error priority event.
      void fatalError​(java.lang.String message)
      Log a fatalError priority event.
      void fatalError​(java.lang.String message, java.lang.Throwable throwable)
      Log a fatalError priority event.
      Logger getChildLogger​(java.lang.String subCategory)
      Create a new child logger.
      Logger[] getChildren()
      Get all the child Loggers of current logger.
      void info​(java.lang.String message)
      Log a info priority event.
      void info​(java.lang.String message, java.lang.Throwable throwable)
      Log a info priority event.
      boolean isDebugEnabled()
      Determine if messages of priority DEBUG will be logged.
      boolean isErrorEnabled()
      Determine if messages of priority ERROR will be logged.
      boolean isFatalErrorEnabled()
      Determine if messages of priority FATAL_ERROR will be logged.
      boolean isInfoEnabled()
      Determine if messages of priority INFO will be logged.
      boolean isPriorityEnabled​(Priority priority)
      Determine if messages of priority �will be logged.
      boolean isWarnEnabled()
      Determine if messages of priority WARN will be logged.
      void log​(Priority priority, java.lang.String message)
      Log a event at specific priority with a certain message.
      void log​(Priority priority, java.lang.String message, java.lang.Throwable throwable)
      Log a event at specific priority with a certain message and throwable.
      void setAdditivity​(boolean additivity)
      Make this logger additive.
      void setLogTargets​(LogTarget[] logTargets)
      Set the log targets for this logger.
      void setPriority​(Priority priority)
      Set the priority for this logger.
      void unsetLogTargets()
      Unset the logtargets for this logger.
      void unsetLogTargets​(boolean recursive)
      Unset the logtargets for this logger and all child loggers if recursive is set.
      void unsetPriority()
      Unset the priority of Logger.
      void unsetPriority​(boolean recursive)
      Unset the priority of Logger.
      void warn​(java.lang.String message)
      Log a warn priority event.
      void warn​(java.lang.String message, java.lang.Throwable throwable)
      Log a warn priority event.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • CATEGORY_SEPARATOR

        public static final char CATEGORY_SEPARATOR
        Separator character use to separate different categories
        See Also:
        Constant Field Values

    • Method Detail

      • isDebugEnabled

        public final boolean isDebugEnabled()
        Determine if messages of priority DEBUG will be logged.
        Returns:
        true if DEBUG messages will be logged

      • debug

        public final void debug​(java.lang.String message,
                        java.lang.Throwable throwable)
        Log a debug priority event.
        Parameters:
        message - the message
        throwable - the throwable

      • debug

        public final void debug​(java.lang.String message)
        Log a debug priority event.
        Parameters:
        message - the message

      • isInfoEnabled

        public final boolean isInfoEnabled()
        Determine if messages of priority INFO will be logged.
        Returns:
        true if INFO messages will be logged

      • info

        public final void info​(java.lang.String message,
                       java.lang.Throwable throwable)
        Log a info priority event.
        Parameters:
        message - the message
        throwable - the throwable

      • info

        public final void info​(java.lang.String message)
        Log a info priority event.
        Parameters:
        message - the message

      • isWarnEnabled

        public final boolean isWarnEnabled()
        Determine if messages of priority WARN will be logged.
        Returns:
        true if WARN messages will be logged

      • warn

        public final void warn​(java.lang.String message,
                       java.lang.Throwable throwable)
        Log a warn priority event.
        Parameters:
        message - the message
        throwable - the throwable

      • warn

        public final void warn​(java.lang.String message)
        Log a warn priority event.
        Parameters:
        message - the message

      • isErrorEnabled

        public final boolean isErrorEnabled()
        Determine if messages of priority ERROR will be logged.
        Returns:
        true if ERROR messages will be logged

      • error

        public final void error​(java.lang.String message,
                        java.lang.Throwable throwable)
        Log a error priority event.
        Parameters:
        message - the message
        throwable - the throwable

      • error

        public final void error​(java.lang.String message)
        Log a error priority event.
        Parameters:
        message - the message

      • isFatalErrorEnabled

        public final boolean isFatalErrorEnabled()
        Determine if messages of priority FATAL_ERROR will be logged.
        Returns:
        true if FATAL_ERROR messages will be logged

      • fatalError

        public final void fatalError​(java.lang.String message,
                             java.lang.Throwable throwable)
        Log a fatalError priority event.
        Parameters:
        message - the message
        throwable - the throwable

      • fatalError

        public final void fatalError​(java.lang.String message)
        Log a fatalError priority event.
        Parameters:
        message - the message

      • setAdditivity

        public final void setAdditivity​(boolean additivity)
        Make this logger additive. I.e. Send all log events to parent loggers LogTargets regardless of whether or not the LogTargets have been overidden. This is derived from Log4js notion of Additivity.
        Parameters:
        additivity - true to make logger additive, false otherwise

      • isPriorityEnabled

        public final boolean isPriorityEnabled​(Priority priority)
        Determine if messages of priority �will be logged.
        Parameters:
        priority - the priority
        Returns:
        true if messages will be logged

      • log

        public final void log​(Priority priority,
                      java.lang.String message,
                      java.lang.Throwable throwable)
        Log a event at specific priority with a certain message and throwable.
        Parameters:
        priority - the priority
        message - the message
        throwable - the throwable

      • log

        public final void log​(Priority priority,
                      java.lang.String message)
        Log a event at specific priority with a certain message.
        Parameters:
        priority - the priority
        message - the message

      • setPriority

        public void setPriority​(Priority priority)
        Set the priority for this logger.
        Parameters:
        priority - the priority

      • unsetPriority

        public void unsetPriority()
        Unset the priority of Logger. (Thus it will use it's parent's priority or DEBUG if no parent.

      • unsetPriority

        public void unsetPriority​(boolean recursive)
        Unset the priority of Logger. (Thus it will use it's parent's priority or DEBUG if no parent. If recursive is true unset priorities of all child loggers.
        Parameters:
        recursive - true to unset priority of all child loggers

      • setLogTargets

        public void setLogTargets​(LogTarget[] logTargets)
        Set the log targets for this logger.
        Parameters:
        logTargets - the Log Targets

      • unsetLogTargets

        public void unsetLogTargets()
        Unset the logtargets for this logger. This logger (and thus all child loggers who don't specify logtargets) will inherit from the parents LogTargets.

      • unsetLogTargets

        public void unsetLogTargets​(boolean recursive)
        Unset the logtargets for this logger and all child loggers if recursive is set. The loggers unset (and all child loggers who don't specify logtargets) will inherit from the parents LogTargets.
        Parameters:
        recursive - the recursion policy

      • getChildren

        public Logger[] getChildren()
        Get all the child Loggers of current logger.
        Returns:
        the child loggers

      • getChildLogger

        public Logger getChildLogger​(java.lang.String subCategory)
                      throws java.lang.IllegalArgumentException
        Create a new child logger. The category of child logger is [current-category].subcategory
        Parameters:
        subCategory - the subcategory of this logger
        Returns:
        the new logger
        Throws:
        java.lang.IllegalArgumentException - if subCategory has an empty element name