System.Log

Haskell Logging Framework

Written by John Goerzen, [e-mail]

This module defines basic types used for logging.

Extensive documentation is available in System.Log.Logger.

Types

data Priority

Priorities are used to define how important a log message is. Users can filter log messages based on priorities.

These have their roots on the traditional syslog system. The standard definitions are given below, but you are free to interpret them however you like. They are listed here in ascending importance order.

Constructors

DEBUG

Debug messages

INFO

Information

NOTICE

Normal runtime conditions

WARNING

General Warnings

ERROR

General Errors

CRITICAL

Severe situations

ALERT

Take immediate action

EMERGENCY

System is unusable

Instances

Bounded Priority

Defined in System.Log

Methods

minBound :: Priority

maxBound :: Priority

Enum Priority

Defined in System.Log

Methods

succ :: Priority -> Priority

pred :: Priority -> Priority

toEnum :: Int -> Priority

fromEnum :: Priority -> Int

enumFrom :: Priority -> [Priority]

enumFromThen :: Priority -> Priority -> [Priority]

enumFromTo :: Priority -> Priority -> [Priority]

enumFromThenTo :: Priority -> Priority -> Priority -> [Priority]

Eq Priority

Defined in System.Log

Methods

(==) :: Priority -> Priority -> Bool

(/=) :: Priority -> Priority -> Bool

Ord Priority

Defined in System.Log

Methods

compare :: Priority -> Priority -> Ordering

(<) :: Priority -> Priority -> Bool

(<=) :: Priority -> Priority -> Bool

(>) :: Priority -> Priority -> Bool

(>=) :: Priority -> Priority -> Bool

max :: Priority -> Priority -> Priority

min :: Priority -> Priority -> Priority

Read Priority

Defined in System.Log

Methods

readsPrec :: Int -> ReadS Priority

readList :: ReadS [Priority]

readPrec :: ReadPrec Priority

readListPrec :: ReadPrec [Priority]

Show Priority

Defined in System.Log

Methods

showsPrec :: Int -> Priority -> ShowS

show :: Priority -> String

showList :: [Priority] -> ShowS

type LogRecord = (Priority, String)

Internal type of log records