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282 lines
9.5 KiB
282 lines
9.5 KiB
// -*- C++ -*-
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// Module: Log4CPLUS
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// File: fileappender.h
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// Created: 6/2001
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// Author: Tad E. Smith
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//
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//
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// Copyright 2001-2013 Tad E. Smith
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/** @file */
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#ifndef LOG4CPLUS_FILE_APPENDER_HEADER_
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#define LOG4CPLUS_FILE_APPENDER_HEADER_
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#include <log4cplus/config.hxx>
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#if defined (LOG4CPLUS_HAVE_PRAGMA_ONCE)
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#pragma once
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#endif
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#include <log4cplus/appender.h>
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#include <log4cplus/fstreams.h>
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#include <log4cplus/helpers/timehelper.h>
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#include <log4cplus/helpers/lockfile.h>
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#include <fstream>
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#include <locale>
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#include <memory>
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namespace log4cplus
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{
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/**
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* Appends log events to a file.
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*
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* <h3>Properties</h3>
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* <dl>
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* <dt><tt>File</tt></dt>
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* <dd>This property specifies output file name.</dd>
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*
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* <dt><tt>ImmediateFlush</tt></dt>
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* <dd>When it is set true, output stream will be flushed after
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* each appended event.</dd>
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*
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* <dt><tt>Append</tt></dt>
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* <dd>When it is set true, output file will be appended to
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* instead of being truncated at opening.</dd>
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*
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* <dt><tt>ReopenDelay</tt></dt>
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* <dd>This property sets a delay after which the appender will try
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* to reopen log file again, after last logging failure.
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* </dd>
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*
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* <dt><tt>BufferSize</tt></dt>
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* <dd>Non-zero value of this property sets up buffering of output
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* stream using a buffer of given size.
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* </dd>
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*
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* <dt><tt>UseLockFile</tt></dt>
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* <dd>Set this property to <tt>true</tt> if you want your output
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* to go into a log file shared by multiple processes. When this
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* property is set to true then log4cplus uses OS specific
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* facilities (e.g., <code>lockf()</code>) to provide
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* inter-process file locking.
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* \sa Appender
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* </dd>
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*
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* <dt><tt>LockFile</tt></dt>
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* <dd>This property specifies lock file, file used for
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* inter-process synchronization of log file access. When this
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* property is not specified, the value is derived from
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* <tt>File</tt> property by addition of ".lock" suffix. The
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* property is only used when <tt>UseLockFile</tt> is set to true.
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* \sa Appender
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* </dd>
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*
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* <dt><tt>Locale</tt></dt>
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* <dd>This property specifies a locale name that will be imbued
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* into output stream. Locale can be specified either by system
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* specific locale name, e.g., <tt>en_US.UTF-8</tt>, or by one of
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* four recognized keywords: <tt>GLOBAL</tt>, <tt>DEFAULT</tt>
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* (which is an alias for <tt>GLOBAL</tt>), <tt>USER</tt> and
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* <tt>CLASSIC</tt>. When specified locale is not available,
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* <tt>GLOBAL</tt> is used instead. It is possible to register
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* additional locale keywords by registering an instance of
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* <code>spi::LocaleFactory</code> in
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* <code>spi::LocaleFactoryRegistry</code>.
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* \sa spi::getLocaleFactoryRegistry()
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* </dd>
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*
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* </dl>
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*/
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class LOG4CPLUS_EXPORT FileAppender : public Appender {
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public:
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// Ctors
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FileAppender(const log4cplus::tstring& filename,
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std::ios_base::openmode mode = std::ios_base::trunc,
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bool immediateFlush = true);
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FileAppender(const log4cplus::helpers::Properties& properties,
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std::ios_base::openmode mode = std::ios_base::trunc);
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// Dtor
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virtual ~FileAppender();
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// Methods
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virtual void close();
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//! Redefine default locale for output stream. It may be a good idea to
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//! provide UTF-8 locale in case UNICODE macro is defined.
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virtual std::locale imbue(std::locale const& loc);
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//! \returns Locale imbued in fstream.
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virtual std::locale getloc () const;
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protected:
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virtual void append(const spi::InternalLoggingEvent& event);
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void open(std::ios_base::openmode mode);
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bool reopen();
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// Data
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/**
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* Immediate flush means that the underlying writer or output stream
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* will be flushed at the end of each append operation. Immediate
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* flush is slower but ensures that each append request is actually
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* written. If <code>immediateFlush</code> is set to
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* <code>false</code>, then there is a good chance that the last few
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* logs events are not actually written to persistent media if and
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* when the application crashes.
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*
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* The <code>immediateFlush</code> variable is set to
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* <code>true</code> by default.
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*/
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bool immediateFlush;
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/**
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* When any append operation fails, <code>reopenDelay</code> says
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* for how many seconds the next attempt to re-open the log file and
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* resume logging will be delayed. If <code>reopenDelay</code> is zero,
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* each failed append operation will cause log file to be re-opened.
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* By default, <code>reopenDelay</code> is 1 second.
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*/
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int reopenDelay;
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unsigned long bufferSize;
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log4cplus::tchar * buffer;
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log4cplus::tofstream out;
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log4cplus::tstring filename;
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log4cplus::tstring localeName;
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log4cplus::helpers::Time reopen_time;
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private:
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LOG4CPLUS_PRIVATE void init(const log4cplus::tstring& filename,
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std::ios_base::openmode mode,
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const log4cplus::tstring& lockFileName);
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// Disallow copying of instances of this class
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FileAppender(const FileAppender&);
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FileAppender& operator=(const FileAppender&);
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};
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/**
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* RollingFileAppender extends FileAppender to backup the log
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* files when they reach a certain size.
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*
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* <h3>Properties</h3>
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* <p>Properties additional to {@link FileAppender}'s properties:
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*
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* <dl>
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* <dt><tt>MaxFileSize</tt></dt>
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* <dd>This property specifies maximal size of output file. The
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* value is in bytes. It is possible to use <tt>MB</tt> and
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* <tt>KB</tt> suffixes to specify the value in megabytes or
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* kilobytes instead.</dd>
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*
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* <dt><tt>MaxBackupIndex</tt></dt>
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* <dd>This property limits the number of backup output
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* files; e.g. how many <tt>log.1</tt>, <tt>log.2</tt> etc. files
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* will be kept.</dd>
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* </dl>
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*/
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class LOG4CPLUS_EXPORT RollingFileAppender : public FileAppender {
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public:
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// Ctors
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RollingFileAppender(const log4cplus::tstring& filename,
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long maxFileSize = 10*1024*1024, // 10 MB
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int maxBackupIndex = 1,
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bool immediateFlush = true);
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RollingFileAppender(const log4cplus::helpers::Properties& properties);
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// Dtor
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virtual ~RollingFileAppender();
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protected:
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virtual void append(const spi::InternalLoggingEvent& event);
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void rollover(bool alreadyLocked = false);
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// Data
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long maxFileSize;
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int maxBackupIndex;
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private:
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LOG4CPLUS_PRIVATE void init(long maxFileSize, int maxBackupIndex);
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};
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enum DailyRollingFileSchedule { MONTHLY, WEEKLY, DAILY,
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TWICE_DAILY, HOURLY, MINUTELY};
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/**
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* DailyRollingFileAppender extends {@link FileAppender} so that the
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* underlying file is rolled over at a user chosen frequency.
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*
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* <h3>Properties</h3>
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* <p>Properties additional to {@link FileAppender}'s properties:
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*
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* <dl>
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* <dt><tt>Schedule</tt></dt>
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* <dd>This property specifies rollover schedule. The possible
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* values are <tt>MONTHLY</tt>, <tt>WEEKLY</tt>, <tt>DAILY</tt>,
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* <tt>TWICE_DAILY</tt>, <tt>HOURLY</tt> and
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* <tt>MINUTELY</tt>.</dd>
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*
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* <dt><tt>MaxBackupIndex</tt></dt>
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* <dd>This property limits how many backup files are kept per
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* single logging period; e.g. how many <tt>log.2009-11-07.1</tt>,
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* <tt>log.2009-11-07.2</tt> etc. files are kept.</dd>
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*
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* </dl>
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*/
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class LOG4CPLUS_EXPORT DailyRollingFileAppender : public FileAppender {
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public:
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// Ctors
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DailyRollingFileAppender(const log4cplus::tstring& filename,
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DailyRollingFileSchedule schedule = DAILY,
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bool immediateFlush = true,
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int maxBackupIndex = 10);
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DailyRollingFileAppender(const log4cplus::helpers::Properties& properties);
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// Dtor
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virtual ~DailyRollingFileAppender();
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// Methods
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virtual void close();
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protected:
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virtual void append(const spi::InternalLoggingEvent& event);
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void rollover(bool alreadyLocked = false);
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log4cplus::helpers::Time calculateNextRolloverTime(const log4cplus::helpers::Time& t) const;
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log4cplus::tstring getFilename(const log4cplus::helpers::Time& t) const;
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// Data
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DailyRollingFileSchedule schedule;
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log4cplus::tstring scheduledFilename;
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log4cplus::helpers::Time nextRolloverTime;
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int maxBackupIndex;
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private:
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LOG4CPLUS_PRIVATE void init(DailyRollingFileSchedule schedule);
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};
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} // end namespace log4cplus
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#endif // LOG4CPLUS_FILE_APPENDER_HEADER_
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