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// -*- C++ -*-
// Module: Log4CPLUS
// File: fileappender.h
// Created: 6/2001
// Author: Tad E. Smith
//
//
// Copyright 2001-2017 Tad E. Smith
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/** @file */
#ifndef LOG4CPLUS_FILE_APPENDER_HEADER_
#define LOG4CPLUS_FILE_APPENDER_HEADER_
#include <log4cplus/config.hxx>
#if defined (LOG4CPLUS_HAVE_PRAGMA_ONCE)
#pragma once
#endif
#include <log4cplus/appender.h>
#include <log4cplus/fstreams.h>
#include <log4cplus/helpers/timehelper.h>
#include <log4cplus/helpers/lockfile.h>
#include <fstream>
#include <locale>
#include <memory>
namespace log4cplus
{
/**
* Base class for Appenders writing log events to a file.
* It is constructed with uninitialized file object, so all
* classes derived from FileAppenderBase _must_ call init() method.
*
* <h3>Properties</h3>
* <dl>
* <dt><tt>File</tt></dt>
* <dd>This property specifies output file name.</dd>
*
* <dt><tt>ImmediateFlush</tt></dt>
* <dd>When it is set true, output stream will be flushed after
* each appended event.</dd>
*
* <dt><tt>Append</tt></dt>
* <dd>When it is set true, output file will be appended to
* instead of being truncated at opening.</dd>
*
* <dt><tt>ReopenDelay</tt></dt>
* <dd>This property sets a delay after which the appender will try
* to reopen log file again, after last logging failure.
* </dd>
*
* <dt><tt>BufferSize</tt></dt>
* <dd>Non-zero value of this property sets up buffering of output
* stream using a buffer of given size.
* </dd>
*
* <dt><tt>UseLockFile</tt></dt>
* <dd>Set this property to <tt>true</tt> if you want your output
* to go into a log file shared by multiple processes. When this
* property is set to true then log4cplus uses OS specific
* facilities (e.g., <code>lockf()</code>) to provide
* inter-process file locking.
* \sa Appender
* </dd>
*
* <dt><tt>LockFile</tt></dt>
* <dd>This property specifies lock file, file used for
* inter-process synchronization of log file access. When this
* property is not specified, the value is derived from
* <tt>File</tt> property by addition of ".lock" suffix. The
* property is only used when <tt>UseLockFile</tt> is set to true.
* \sa Appender
* </dd>
*
* <dt><tt>Locale</tt></dt>
* <dd>This property specifies a locale name that will be imbued
* into output stream. Locale can be specified either by system
* specific locale name, e.g., <tt>en_US.UTF-8</tt>, or by one of
* four recognized keywords: <tt>GLOBAL</tt>, <tt>DEFAULT</tt>
* (which is an alias for <tt>GLOBAL</tt>), <tt>USER</tt> and
* <tt>CLASSIC</tt>. When specified locale is not available,
* <tt>GLOBAL</tt> is used instead. It is possible to register
* additional locale keywords by registering an instance of
* <code>spi::LocaleFactory</code> in
* <code>spi::LocaleFactoryRegistry</code>.
* \sa spi::getLocaleFactoryRegistry()
* </dd>
*
* <dt><tt>CreateDirs</tt></dt>
* <dd>Set this property to <tt>true</tt> if you want to create
* missing directories in path leading to log file and lock file.
* </dd>
*
* <dt><tt>TextMode</tt></dt>
* <dd>Set this property to <tt>Binary</tt> if the underlying stream should
* not translate EOLs to OS specific character sequence. The default value
* is <tt>Text</tt> and the underlying stream will be opened in text
* mode.</dd>
* </dl>
*/
class LOG4CPLUS_EXPORT FileAppenderBase : public Appender {
public:
// Methods
virtual void close();
//! Redefine default locale for output stream. It may be a good idea to
//! provide UTF-8 locale in case UNICODE macro is defined.
virtual std::locale imbue(std::locale const& loc);
//! \returns Locale imbued in fstream.
virtual std::locale getloc () const;
protected:
// Ctors
FileAppenderBase(const log4cplus::tstring& filename,
std::ios_base::openmode mode = std::ios_base::trunc,
bool immediateFlush = true,
bool createDirs = false);
FileAppenderBase(const log4cplus::helpers::Properties& properties,
std::ios_base::openmode mode = std::ios_base::trunc);
void init();
virtual void append(const spi::InternalLoggingEvent& event);
virtual void open(std::ios_base::openmode mode);
bool reopen();
// Data
/**
* Immediate flush means that the underlying writer or output stream
* will be flushed at the end of each append operation. Immediate
* flush is slower but ensures that each append request is actually
* written. If <code>immediateFlush</code> is set to
* <code>false</code>, then there is a good chance that the last few
* logs events are not actually written to persistent media if and
* when the application crashes.
*
* The <code>immediateFlush</code> variable is set to
* <code>true</code> by default.
*/
bool immediateFlush;
/**
* When this variable is true, FileAppender will try to create
* missing directories in path leading to log file.
*
* The `createDirs` variable is set to `false` by default.
*/
bool createDirs;
/**
* When any append operation fails, <code>reopenDelay</code> says
* for how many seconds the next attempt to re-open the log file and
* resume logging will be delayed. If <code>reopenDelay</code> is zero,
* each failed append operation will cause log file to be re-opened.
* By default, <code>reopenDelay</code> is 1 second.
*/
int reopenDelay;
unsigned long bufferSize;
std::unique_ptr<log4cplus::tchar[]> buffer;
log4cplus::tofstream out;
log4cplus::tstring filename;
log4cplus::tstring localeName;
log4cplus::tstring lockFileName;
std::ios_base::openmode fileOpenMode;
log4cplus::helpers::Time reopen_time;
private:
// Disallow copying of instances of this class
FileAppenderBase(const FileAppenderBase&);
FileAppenderBase& operator=(const FileAppenderBase&);
};
/**
* Appends log events to a file.
*
* <h3>Properties</h3>
* <p>It has no properties additional to {@link FileAppenderBase}.
*/
class LOG4CPLUS_EXPORT FileAppender : public FileAppenderBase {
public:
// Ctors
FileAppender(const log4cplus::tstring& filename,
std::ios_base::openmode mode = std::ios_base::trunc,
bool immediateFlush = true,
bool createDirs = false);
FileAppender(const log4cplus::helpers::Properties& properties,
std::ios_base::openmode mode = std::ios_base::trunc);
// Dtor
virtual ~FileAppender();
protected:
void init();
};
typedef helpers::SharedObjectPtr<FileAppender> SharedFileAppenderPtr;
/**
* RollingFileAppender extends FileAppender to backup the log
* files when they reach a certain size.
*
* <h3>Properties</h3>
* <p>Properties additional to {@link FileAppender}'s properties:
*
* <dl>
* <dt><tt>MaxFileSize</tt></dt>
* <dd>This property specifies maximal size of output file. The
* value is in bytes. It is possible to use <tt>MB</tt> and
* <tt>KB</tt> suffixes to specify the value in megabytes or
* kilobytes instead.</dd>
*
* <dt><tt>MaxBackupIndex</tt></dt>
* <dd>This property limits the number of backup output
* files; e.g. how many <tt>log.1</tt>, <tt>log.2</tt> etc. files
* will be kept.</dd>
* </dl>
*/
class LOG4CPLUS_EXPORT RollingFileAppender : public FileAppender {
public:
// Ctors
RollingFileAppender(const log4cplus::tstring& filename,
long maxFileSize = 10*1024*1024, // 10 MB
int maxBackupIndex = 1,
bool immediateFlush = true,
bool createDirs = false);
RollingFileAppender(const log4cplus::helpers::Properties& properties);
// Dtor
virtual ~RollingFileAppender();
protected:
virtual void append(const spi::InternalLoggingEvent& event);
void rollover(bool alreadyLocked = false);
// Data
long maxFileSize;
int maxBackupIndex;
private:
LOG4CPLUS_PRIVATE void init(long maxFileSize, int maxBackupIndex);
};
typedef helpers::SharedObjectPtr<RollingFileAppender>
SharedRollingFileAppenderPtr;
enum DailyRollingFileSchedule { MONTHLY, WEEKLY, DAILY,
TWICE_DAILY, HOURLY, MINUTELY};
/**
* DailyRollingFileAppender extends {@link FileAppender} so that the
* underlying file is rolled over at a user chosen frequency.
*
* <h3>Properties</h3>
* <p>Properties additional to {@link FileAppender}'s properties:
*
* <dl>
* <dt><tt>Schedule</tt></dt>
* <dd>This property specifies rollover schedule. The possible
* values are <tt>MONTHLY</tt>, <tt>WEEKLY</tt>, <tt>DAILY</tt>,
* <tt>TWICE_DAILY</tt>, <tt>HOURLY</tt> and
* <tt>MINUTELY</tt>.</dd>
*
* <dt><tt>MaxBackupIndex</tt></dt>
* <dd>This property limits how many backup files are kept per
* single logging period; e.g. how many <tt>log.2009-11-07.1</tt>,
* <tt>log.2009-11-07.2</tt> etc. files are kept.</dd>
*
* <dt><tt>RollOnClose</tt></dt>
* <dd>This property specifies whether to rollover log files upon
* shutdown. By default it's set to <code>true</code> to retain compatibility
* with legacy code, however it may lead to undesired behaviour
* as described in the github issue #120.</dd>
*
* <dt><tt>DatePattern</tt></dt>
* <dd>This property specifies filename suffix pattern to use for
* periodical backups of the logfile. The patern should be in
* format supported by {@link log4cplus::helpers::Time::getFormatterTime()}</code>.
* Please notice that the format of the pattern is similar but not identical
* to the one used for this option in the corresponding Log4J class.
* If the property isn't specified a reasonable default for a given
* schedule type is used.</dd>
*
* </dl>
*/
class LOG4CPLUS_EXPORT DailyRollingFileAppender : public FileAppender {
public:
// Ctors
DailyRollingFileAppender(const log4cplus::tstring& filename,
DailyRollingFileSchedule schedule = DAILY,
bool immediateFlush = true,
int maxBackupIndex = 10,
bool createDirs = false,
bool rollOnClose = true,
const log4cplus::tstring& datePattern = log4cplus::tstring());
DailyRollingFileAppender(const log4cplus::helpers::Properties& properties);
// Dtor
virtual ~DailyRollingFileAppender();
// Methods
virtual void close();
protected:
virtual void append(const spi::InternalLoggingEvent& event);
void rollover(bool alreadyLocked = false);
log4cplus::helpers::Time calculateNextRolloverTime(const log4cplus::helpers::Time& t) const;
log4cplus::tstring getFilename(const log4cplus::helpers::Time& t) const;
// Data
DailyRollingFileSchedule schedule;
log4cplus::tstring scheduledFilename;
log4cplus::helpers::Time nextRolloverTime;
int maxBackupIndex;
bool rollOnClose;
log4cplus::tstring datePattern;
private:
LOG4CPLUS_PRIVATE void init(DailyRollingFileSchedule schedule);
};
typedef helpers::SharedObjectPtr<DailyRollingFileAppender>
SharedDailyRollingFileAppenderPtr;
/**
* TimeBasedRollingFileAppender extends {@link FileAppenderBase} so that
* the underlying file is rolled over at a user chosen frequency while also
* keeping in check a total maximum number of produced files.
*
* <h3>Properties</h3>
* <p>Properties additional to {@link FileAppenderBase}'s properties:
*
* <dl>
*
* <dt><tt>FilenamePattern</tt></dt>
* <dd>The mandatory fileNamePattern property defines the name of the
* rolled-over (archived) log files. Its value should consist of the name
* of the file, plus a suitably placed %d conversion specifier. The %d
* conversion specifier may contain a date-and-time pattern as specified by
* the java's SimpleDateFormat. The rollover period is inferred from the
* value of fileNamePattern.</dd>
*
* <dt><tt>MaxHistory</tt></dt>
* <dd>The optional maxHistory property controls the maximum number of
* archive files to keep, deleting older files.</dd>
*
* <dt><tt>CleanHistoryOnStart</tt></dt>
* <dd>If set to true, archive removal will be executed on appender start
* up. By default this property is set to false. </dd>
*
* <dt><tt>RollOnClose</tt></dt>
* <dd>This property specifies whether to rollover log files upon
* shutdown. By default it's set to <code>true</code> to retain compatibility
* with legacy code, however it may lead to undesired behaviour
* as described in the github issue #120.</dd>
*
* </dl>
*/
class LOG4CPLUS_EXPORT TimeBasedRollingFileAppender : public FileAppenderBase {
public:
// Ctors
TimeBasedRollingFileAppender(const tstring& filename = LOG4CPLUS_TEXT(""),
const tstring& filenamePattern = LOG4CPLUS_TEXT("%d.log"),
int maxHistory = 10,
bool cleanHistoryOnStart = false,
bool immediateFlush = true,
bool createDirs = false,
bool rollOnClose = true);
TimeBasedRollingFileAppender(const helpers::Properties& properties);
// Dtor
~TimeBasedRollingFileAppender();
protected:
void append(const spi::InternalLoggingEvent& event);
void open(std::ios_base::openmode mode);
void close();
void rollover(bool alreadyLocked = false);
void clean(helpers::Time time);
helpers::Time::duration getRolloverPeriodDuration() const;
helpers::Time calculateNextRolloverTime(const helpers::Time& t) const;
// Data
tstring filenamePattern;
DailyRollingFileSchedule schedule;
tstring scheduledFilename;
int maxHistory;
bool cleanHistoryOnStart;
log4cplus::helpers::Time lastHeartBeat;
log4cplus::helpers::Time nextRolloverTime;
bool rollOnClose;
private:
LOG4CPLUS_PRIVATE void init();
};
typedef helpers::SharedObjectPtr<TimeBasedRollingFileAppender>
SharedTimeBasedRollingFileAppenderPtr;
} // end namespace log4cplus
#endif // LOG4CPLUS_FILE_APPENDER_HEADER_
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