org.apache.log4j

## Interface Appender

-     public interface Appender

  Implement this interface for your own strategies for outputting log statements.
  Author:
    Ceki Gülcü

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addFilter(Filter newFilter)` Add a filter to the end of the filter list.
    `void` | `clearFilters()` Clear the list of filters by removing all the filters in it.
    `void` | `close()` Release any resources allocated within the appender such as file handles, network connections, etc.
    `void` | `doAppend(LoggingEvent event)` Log in `Appender` specific way.
    `ErrorHandler` | `getErrorHandler()` Returns the `ErrorHandler` for this appender.
    `Filter` | `getFilter()` Returns the head Filter.
    `Layout` | `getLayout()` Returns this appenders layout.
    `String` | `getName()` Get the name of this appender.
    `boolean` | `requiresLayout()` Configurators call this method to determine if the appender requires a layout.
    `void` | `setErrorHandler(ErrorHandler errorHandler)` Set the `ErrorHandler` for this appender.
    `void` | `setLayout(Layout layout)` Set the `Layout` for this appender.
    `void` | `setName(String name)` Set the name of this appender.

- - ### 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

          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

    - #### getErrorHandler

          ErrorHandler getErrorHandler()

      Returns the `ErrorHandler` for this appender.
      Since:
        1.1

    - #### 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(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

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