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/*
==============================================================================
This file is part of the juce_core module of the JUCE library.
Copyright (c) 2015 - ROLI Ltd.
Permission to use, copy, modify, and/or distribute this software for any purpose with
or without fee is hereby granted, provided that the above copyright notice and this
permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
------------------------------------------------------------------------------
NOTE! This permissive ISC license applies ONLY to files within the juce_core module!
All other JUCE modules are covered by a dual GPL/commercial license, so if you are
using any other modules, be sure to check that you also comply with their license.
For more details, visit www.juce.com
==============================================================================
*/
#ifndef JUCE_FILELOGGER_H_INCLUDED
#define JUCE_FILELOGGER_H_INCLUDED
//==============================================================================
/**
A simple implementation of a Logger that writes to a file.
@see Logger
*/
class JUCE_API FileLogger : public Logger
{
public:
//==============================================================================
/** Creates a FileLogger for a given file.
@param fileToWriteTo the file that to use - new messages will be appended
to the file. If the file doesn't exist, it will be created,
along with any parent directories that are needed.
@param welcomeMessage when opened, the logger will write a header to the log, along
with the current date and time, and this welcome message
@param maxInitialFileSizeBytes if this is zero or greater, then if the file already exists
but is larger than this number of bytes, then the start of the
file will be truncated to keep the size down. This prevents a log
file getting ridiculously large over time. The file will be truncated
at a new-line boundary. If this value is less than zero, no size limit
will be imposed; if it's zero, the file will always be deleted. Note that
the size is only checked once when this object is created - any logging
that is done later will be appended without any checking
*/
FileLogger (const File& fileToWriteTo,
const String& welcomeMessage,
const int64 maxInitialFileSizeBytes = 128 * 1024);
/** Destructor. */
~FileLogger();
//==============================================================================
/** Returns the file that this logger is writing to. */
const File& getLogFile() const noexcept { return logFile; }
//==============================================================================
/** Helper function to create a log file in the correct place for this platform.
The method might return nullptr if the file can't be created for some reason.
@param logFileSubDirectoryName the name of the subdirectory to create inside the logs folder (as
returned by getSystemLogFileFolder). It's best to use something
like the name of your application here.
@param logFileName the name of the file to create, e.g. "MyAppLog.txt".
@param welcomeMessage a message that will be written to the log when it's opened.
@param maxInitialFileSizeBytes (see the FileLogger constructor for more info on this)
*/
static FileLogger* createDefaultAppLogger (const String& logFileSubDirectoryName,
const String& logFileName,
const String& welcomeMessage,
const int64 maxInitialFileSizeBytes = 128 * 1024);
/** Helper function to create a log file in the correct place for this platform.
The filename used is based on the root and suffix strings provided, along with a
time and date string, meaning that a new, empty log file will be always be created
rather than appending to an exising one.
The method might return nullptr if the file can't be created for some reason.
@param logFileSubDirectoryName the name of the subdirectory to create inside the logs folder (as
returned by getSystemLogFileFolder). It's best to use something
like the name of your application here.
@param logFileNameRoot the start of the filename to use, e.g. "MyAppLog_". This will have
a timestamp and the logFileNameSuffix appended to it
@param logFileNameSuffix the file suffix to use, e.g. ".txt"
@param welcomeMessage a message that will be written to the log when it's opened.
*/
static FileLogger* createDateStampedLogger (const String& logFileSubDirectoryName,
const String& logFileNameRoot,
const String& logFileNameSuffix,
const String& welcomeMessage);
//==============================================================================
/** Returns an OS-specific folder where log-files should be stored.
On Windows this will return a logger with a path such as:
c:\\Documents and Settings\\username\\Application Data\\[logFileSubDirectoryName]\\[logFileName]
On the Mac it'll create something like:
~/Library/Logs/[logFileSubDirectoryName]/[logFileName]
@see createDefaultAppLogger
*/
static File getSystemLogFileFolder();
// (implementation of the Logger virtual method)
void logMessage (const String&);
//==============================================================================
/** This is a utility function which removes lines from the start of a text
file to make sure that its total size is below the given size.
*/
static void trimFileSize (const File& file, int64 maxFileSize);
private:
//==============================================================================
File logFile;
CriticalSection logLock;
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (FileLogger)
};
#endif // JUCE_FILELOGGER_H_INCLUDED
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