Package org.apache.log4j

Interface Appender

  • public interface Appender
    Implement this interface for your own strategies for outputting log statements.

    • Method Detail

      • addFilter

        void addFilter​(Filter newFilter)
        Add a filter to the end of the filter list.
        Since:
        0.9.0

      • getFilter

        Filter getFilter()
        Returns the head Filter. The Filters are organized in a linked list and so all Filters on this Appender are available through the result.
        Returns:
        the head Filter or null, if no Filters are present
        Since:
        1.1

      • clearFilters

        void clearFilters()
        Clear the list of filters by removing all the filters in it.
        Since:
        0.9.0

      • close

        void close()
        Release any resources allocated within the appender such as file handles, network connections, etc.

        It is a programming error to append to a closed appender.

        Since:
        0.8.4

      • doAppend

        void doAppend​(LoggingEvent event)
        Log in Appender specific way. When appropriate, Loggers will call the doAppend method of appender implementations in order to log.

      • getName

        java.lang.String getName()
        Get the name of this appender. The name uniquely identifies the appender.

      • setErrorHandler

        void setErrorHandler​(ErrorHandler errorHandler)
        Set the ErrorHandler for this appender.
        Since:
        0.9.0

      • setLayout

        void setLayout​(Layout layout)
        Set the Layout for this appender.
        Since:
        0.8.1

      • getLayout

        Layout getLayout()
        Returns this appenders layout.
        Since:
        1.1

      • setName

        void setName​(java.lang.String name)
        Set the name of this appender. The name is used by other components to identify this appender.
        Since:
        0.8.1

      • requiresLayout

        boolean requiresLayout()
        Configurators call this method to determine if the appender requires a layout. If this method returns true, meaning that layout is required, then the configurator will configure an layout using the configuration information at its disposal. If this method returns false, meaning that a layout is not required, then layout configuration will be skipped even if there is available layout configuration information at the disposal of the configurator.

        In the rather exceptional case, where the appender implementation admits a layout but can also work without it, then the appender should return true.

        Since:
        0.8.4