/usr/include/tango/log4tango/Appender.hh is in liblog4tango-dev 9.2.5a+dfsg1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Appender.hh
//
// Copyright (C) : 2000 - 2002
// LifeLine Networks BV (www.lifeline.nl). All rights reserved.
// Bastiaan Bakker. All rights reserved.
//
// 2004,2005,2006,2007,2008,2009,2010,2011,2012
// Synchrotron SOLEIL
// L'Orme des Merisiers
// Saint-Aubin - BP 48 - France
//
// This file is part of log4tango.
//
// Log4ango is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Log4tango is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Log4Tango. If not, see <http://www.gnu.org/licenses/>.
#include <log4tango/Portability.hh>
#include <string>
#include <map>
#include <set>
#include <log4tango/Level.hh>
#include <log4tango/Layout.hh>
#include <log4tango/LoggingEvent.hh>
#include <log4tango/threading/Threading.hh>
#ifndef _LOG4TANGO_APPENDER_H
#define _LOG4TANGO_APPENDER_H
namespace log4tango {
//-----------------------------------------------------------------------------
// class : Appender
//-----------------------------------------------------------------------------
class LOG4TANGO_EXPORT Appender
{
friend class Logger;
protected:
/**
* Constructor for Appender. Will only be used in
* getAppender() (and in derived classes of course).
* @param name The name of this Appender.
**/
Appender (const std::string& name);
/**
* Inform an appender that its Logger's logging level has changed.
* The default implementation does nothing.
*
* @param new_level The new Logger's level.
**/
virtual void level_changed (Level::Value new_level);
public:
/**
* Destructor for Appender.
**/
virtual ~Appender ();
/**
* Log in Appender specific way. Returns -1 on error, 0 otherwise.
* @param event The LoggingEvent to log.
**/
#if defined(APPENDERS_HAVE_LEVEL_THRESHOLD) || defined(APPENDERS_HAVE_FILTERS)
int append (const LoggingEvent& event);
#else
inline int append (const LoggingEvent& event) {
return _append(event);
}
#endif
/**
* Reopens the output destination of this Appender, e.g. the logfile
* or TCP socket.
* @returns false if an error occured during reopening, true otherwise.
**/
virtual bool reopen (void);
/**
* Release any resources allocated within the appender such as file
* handles, network connections, etc.
**/
virtual void close (void) = 0;
/**
* Check if the appender uses a layout.
*
* @returns true if the appender implementation requires a layout.
**/
virtual bool requires_layout (void) const = 0;
/**
* Change the layout.
**/
virtual void set_layout (Layout* layout = 0) = 0;
/**
* Returns this appender name.
**/
inline const std::string& get_name (void) const {
return _name;
}
/**
* Check if the appender is valid (for instance the underlying connection is ok)
* This default implementation always return true. Overload to define your own
* behaviour.
*
* @returns true if the appender is valid, false otherwise.
**/
virtual bool is_valid (void) const;
#ifdef APPENDERS_HAVE_LEVEL_THRESHOLD
/**
* Set the threshold level of this Appender. The Appender will not
* appender LoggingEvents with a level lower than the threshold.
* Use Level::NOTSET to disable level checking.
* @param level The level to set.
**/
void set_level (Level::Value level);
/**
* Get the threshold level of this Appender.
* @returns the threshold
**/
Level::Value get_level (void) const;
#endif // APPENDERS_HAVE_LEVEL_THRESHOLD
#ifdef APPENDERS_HAVE_FILTERS
/**
* Set a Filter for this appender.
**/
virtual void set_filter (Filter* filter);
/**
* Get the Filter for this appender.
* @returns the filter, or NULL if no filter has been set.
**/
virtual Filter* get_filter (void);
#endif // APPENDERS_HAVE_FILTERS
protected:
/**
* Log in Appender specific way. Subclasses of Appender should
* implement this method to perform actual logging.
* @param event The LoggingEvent to log.
**/
virtual int _append(const LoggingEvent& event) = 0;
private:
/**
* The appender name
**/
const std::string _name;
#ifdef APPENDERS_HAVE_LEVEL_THRESHOLD
/**
* The appender logging level
**/
Level::Value _level;
#endif
#ifdef APPENDERS_HAVE_FILTERS
/**
* The appender filter list
**/
Filter* _filter;
#endif
};
} // namespace log4tango
#endif // _LOG4TANGO_APPENDER_H
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