Safe Haskell	None

System.Log.FastLogger

Contents

Creating a logger set
Buffer size
Renewing and removing a logger set
Log messages
Writing a log message
Flushing buffered log messages
File rotation

Description

This module provides a fast logging system which scales on multicore environments (i.e. +RTS -N<x>).

Synopsis

Creating a logger set

data LoggerSet Source

A set of loggers. The number of loggers is the capabilities of GHC RTS. You can specify it with "+RTS -N<x>". A buffer is prepared for each capability.

newFileLoggerSet :: BufSize -> FilePath -> IO LoggerSet Source

Creating a new LoggerSet using a file.

newStdoutLoggerSet :: BufSize -> IO LoggerSet Source

Creating a new LoggerSet using stdout.

newStderrLoggerSet :: BufSize -> IO LoggerSet Source

Creating a new LoggerSet using stderr.

newLoggerSet :: BufSize -> Maybe FilePath -> IO LoggerSet Source

Deprecated: Use newFileLoggerSet etc instead

Creating a new LoggerSet. If Nothing is specified to the second argument, stdout is used. Please note that the minimum BufSize is 1.

Buffer size

type BufSize = Int Source

The type for buffer size of each core.

defaultBufSize :: BufSize Source

The default buffer size (4,096 bytes).

Renewing and removing a logger set

renewLoggerSet :: LoggerSet -> IO ()Source

Renewing the internal file information in LoggerSet. This does nothing for stdout and stderr.

rmLoggerSet :: LoggerSet -> IO ()Source

Flushing the buffers, closing the internal file information and freeing the buffers.

Log messages

data LogStr Source

Log message builder. Use (<>) to append two LogStr in O(1).

Instances

IsString LogStr
Monoid LogStr
ToLogStr LogStr

class ToLogStr msg whereSource

Methods

toLogStr :: msg -> LogStr Source

Instances

ToLogStr String
ToLogStr Text
ToLogStr Text
ToLogStr ByteString
ToLogStr ByteString
ToLogStr LogStr

fromLogStr :: LogStr -> ByteString Source

Converting LogStr to ByteString.

logStrLength :: LogStr -> Int Source

Obtaining the length of LogStr.

Writing a log message

pushLogStr :: LoggerSet -> LogStr -> IO ()Source

Writing a log message to the corresponding buffer. If the buffer becomes full, the log messages in the buffer are written to its corresponding file, stdout, or stderr.

Flushing buffered log messages

flushLogStr :: LoggerSet -> IO ()Source

Flushing log messages in buffers. This function must be called explicitly when the program is being terminated.

Note: Since version 2.1.6, this function does not need to be explicitly called, as every push includes an auto-debounced flush courtesy of the auto-update package.

File rotation

module System.Log.FastLogger.File