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# AppenderSkeleton Class Reference

Inherits Appender, and ObjectImpl.

Inherited by AsyncAppender`[virtual]`, ODBCAppender, SMTPAppender, SocketAppenderSkeleton, SocketHubAppender, SyslogAppender, TelnetAppender, NTEventLogAppender, OutputDebugStringAppender, and WriterAppender.

List of all members.

## Detailed Description

Implementation base class for all appenders.

This class provides the code for common functionality, such as support for threshold filtering and support for general filters.

## Public Member Functions
| AppenderSkeleton ()
| AppenderSkeleton (const LayoutPtr &layout)
void | addRef () const
void | releaseRef () const
void | finalize ()
| Finalize this appender by calling the derived class' `close` method.
virtual void | activateOptions (log4cxx::helpers::Pool &)
| Derived appenders should override this method if option structure requires it.
virtual void | setOption (const LogString &option, const LogString &value)
| Set `option` to `value`.
void | addFilter (const spi::FilterPtr &newFilter)
| Add a filter to end of the filter list.
void | clearFilters ()
| Clear the filters chain.
const spi::ErrorHandlerPtr & | getErrorHandler () const
| Return the currently set spi::ErrorHandler for this Appender.
spi::FilterPtr | getFilter () const
| Returns the head Filter.
const spi::FilterPtr & | getFirstFilter () const
| Return the first filter in the filter chain for this Appender.
LayoutPtr | getLayout () const
| Returns the layout of this appender.
LogString | getName () const
| Returns the name of this Appender.
const LevelPtr & | getThreshold ()
| Returns this appenders threshold level.
bool | isAsSevereAsThreshold (const LevelPtr &level) const
| Check whether the message level is below the appender's threshold.
void | doAppend (const spi::LoggingEventPtr &event, log4cxx::helpers::Pool &pool)
| This method performs threshold checks and invokes filters before delegating actual logging to the subclasses specific AppenderSkeleton::append method.
void | setErrorHandler (const spi::ErrorHandlerPtr &eh)
| Set the ErrorHandler for this Appender.
void | setLayout (const LayoutPtr &layout1)
| Set the layout for this appender.
void | setName (const LogString &name1)
| Set the name of this Appender.
void | setThreshold (const LevelPtr &threshold)
| Set the threshold level.
## Protected Member Functions
virtual void | append (const spi::LoggingEventPtr &event, log4cxx::helpers::Pool &p)=0
| Subclasses of `AppenderSkeleton` should implement this method to perform actual logging.
## Protected Attributes
LayoutPtr | layout
| The layout variable does not need to be set if the appender implementation has its own layout.
LogString | name
| Appenders are named.
LevelPtr | threshold
| There is no level threshold filtering by default.
spi::ErrorHandlerPtr | errorHandler
| It is assumed and enforced that errorHandler is never null.
spi::FilterPtr | headFilter
| The first filter in the filter chain.
spi::FilterPtr | tailFilter
| The last filter in the filter chain.
bool | closed
| Is this appender closed?
log4cxx::helpers::Pool | pool
log4cxx::helpers::Mutex | mutex

## Constructor & Destructor Documentation

AppenderSkeleton | ( |  | ) |

AppenderSkeleton | ( | const LayoutPtr & | layout | ) |

## Member Function Documentation

virtual void activateOptions | ( | log4cxx::helpers::Pool & |  | ) | `[inline, virtual]`

| Derived appenders should override this method if option structure requires it. Implements OptionHandler. Reimplemented in ConsoleAppender, DailyRollingFileAppender, ODBCAppender, FileAppender, SMTPAppender, SocketAppenderSkeleton, SocketHubAppender, SyslogAppender, TelnetAppender, NTEventLogAppender, RollingFileAppenderSkeleton, RollingFileAppender, and WriterAppender.

void addFilter | ( | const spi::FilterPtr & | newFilter | ) | `[virtual]`

| Add a filter to end of the filter list. Implements Appender.

void addRef | ( |  | ) | const`[virtual]`

| Reimplemented from ObjectImpl. Reimplemented in AsyncAppender.

virtual void append | ( | const spi::LoggingEventPtr & | event,
|  | log4cxx::helpers::Pool & | p
| ) | `[protected, pure virtual]`

| Subclasses of `AppenderSkeleton` should implement this method to perform actual logging. See also AppenderSkeleton::doAppend method. Implemented in AsyncAppender, ODBCAppender, SMTPAppender, SocketAppender, SocketHubAppender, SyslogAppender, TelnetAppender, XMLSocketAppender, NTEventLogAppender, OutputDebugStringAppender, and WriterAppender.

void clearFilters | ( |  | ) | `[virtual]`

| Clear the filters chain. Implements Appender.

void doAppend | ( | const spi::LoggingEventPtr & | event,
|  | log4cxx::helpers::Pool & | pool
| ) | `[virtual]`

| This method performs threshold checks and invokes filters before delegating actual logging to the subclasses specific AppenderSkeleton::append method. Implements Appender.

void finalize | ( |  | ) |

| Finalize this appender by calling the derived class' `close` method.

const spi::ErrorHandlerPtr& getErrorHandler | ( |  | ) | const`[inline]`

| Return the currently set spi::ErrorHandler for this Appender.

spi::FilterPtr getFilter | ( |  | ) | const`[inline, virtual]`

| Returns the head Filter. Implements Appender.

const spi::FilterPtr& getFirstFilter | ( |  | ) | const`[inline]`

| Return the first filter in the filter chain for this Appender. The return value may be `0` if no is filter is set.

LayoutPtr getLayout | ( |  | ) | const`[inline, virtual]`

| Returns the layout of this appender. The value may be 0. Implements Appender.

LogString getName | ( |  | ) | const`[inline, virtual]`

| Returns the name of this Appender. Implements Appender.

const LevelPtr& getThreshold | ( |  | ) | `[inline]`

| Returns this appenders threshold level. See the setThreshold method for the meaning of this option.

bool isAsSevereAsThreshold | ( | const LevelPtr & | level | ) | const

| Check whether the message level is below the appender's threshold. If there is no threshold set, then the return value is always `true`.

void releaseRef | ( |  | ) | const`[virtual]`

| Reimplemented from ObjectImpl. Reimplemented in AsyncAppender.

void setErrorHandler | ( | const spi::ErrorHandlerPtr & | eh | ) |

| Set the ErrorHandler for this Appender.

void setLayout | ( | const LayoutPtr & | layout1 | ) | `[inline, virtual]`

| Set the layout for this appender. Note that some appenders have their own (fixed) layouts or do not use one. For example, the SocketAppender ignores the layout set here. Implements Appender.

void setName | ( | const LogString & | name1 | ) | `[inline, virtual]`

| Set the name of this Appender. Implements Appender.

virtual void setOption | ( | const LogString & | option,
|  | const LogString & | value
| ) | `[virtual]`

| Set `option` to `value`. The handling of each option depends on the OptionHandler instance. Some options may become active immediately whereas other may be activated only when activateOptions is called. Implements OptionHandler. Reimplemented in AsyncAppender, ConsoleAppender, DailyRollingFileAppender, ODBCAppender, FileAppender, SMTPAppender, SocketAppenderSkeleton, SocketHubAppender, SyslogAppender, TelnetAppender, NTEventLogAppender, RollingFileAppender, and WriterAppender.

void setThreshold | ( | const LevelPtr & | threshold | ) |

| Set the threshold level. All log events with lower level than the threshold level are ignored by the appender. In configuration files this option is specified by setting the value of the Threshold option to a level string, such as "DEBUG", "INFO" and so on.

## Member Data Documentation

bool closed`[protected]`

| Is this appender closed?

spi::ErrorHandlerPtr errorHandler`[protected]`

| It is assumed and enforced that errorHandler is never null.

spi::FilterPtr headFilter`[protected]`

| The first filter in the filter chain. Set to `null` initially.

LayoutPtr layout`[protected]`

| The layout variable does not need to be set if the appender implementation has its own layout.

log4cxx::helpers::Mutex mutex`[protected]`

LogString name`[protected]`

| Appenders are named.

log4cxx::helpers::Pool pool`[protected]`

spi::FilterPtr tailFilter`[protected]`

| The last filter in the filter chain.

LevelPtr threshold`[protected]`

| There is no level threshold filtering by default.

The documentation for this class was generated from the following file:

- appenderskeleton.h