org.jclouds.logging

Interface Logger

All Known Implementing Classes:

BaseLogger, ConsoleLogger, JDKLogger, Log4JLogger, NullLogger, SLF4JLogger

public interface Logger

JClouds log abstraction layer.

Implementations of logging are optional and injected if they are configured.

@Resource Logger logger = Logger.NULL; The above will get you a null-safe instance of Logger. If configured, this logger will be swapped with a real Logger implementation with category set to the current class name. This is done post-object construction, so do not attempt to use these loggers in your constructor.

If you wish to initialize loggers like these yourself, do not use the @Resource annotation.

This implementation first checks to see if the level is enabled before issuing the log command. In other words, don't do the following if (logger.isTraceEnabled()) logger.trace("message");.

Author:

Adrian Cole

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	Logger.LoggerFactory Produces instances of Logger relevant to the specified category

Field Summary

Fields

Modifier and Type	Field and Description
static Logger	CONSOLE Assign to member to avoid NPE when no logging module is configured.
static Logger	NULL Assign to member to avoid NPE when no logging module is configured.

Method Summary

Methods

Modifier and Type	Method and Description
void	debug(String message, Object... args)
void	error(String message, Object... args)
void	error(Throwable throwable, String message, Object... args)
String	getCategory()
void	info(String message, Object... args)
boolean	isDebugEnabled()
boolean	isErrorEnabled()
boolean	isInfoEnabled()
boolean	isTraceEnabled()
boolean	isWarnEnabled()
void	trace(String message, Object... args)
void	warn(String message, Object... args)
void	warn(Throwable throwable, String message, Object... args)

Field Detail

NULL

static final Logger NULL

Assign to member to avoid NPE when no logging module is configured.

CONSOLE

static final Logger CONSOLE

Assign to member to avoid NPE when no logging module is configured.

Method Detail

getCategory

String getCategory()

trace

void trace(String message,
         Object... args)

isTraceEnabled

boolean isTraceEnabled()

debug

void debug(String message,
         Object... args)

isDebugEnabled

boolean isDebugEnabled()

info

void info(String message,
        Object... args)

isInfoEnabled

boolean isInfoEnabled()

warn

void warn(String message,
        Object... args)

warn

void warn(Throwable throwable,
        String message,
        Object... args)

isWarnEnabled

boolean isWarnEnabled()

error

void error(String message,
         Object... args)

error

void error(Throwable throwable,
         String message,
         Object... args)

isErrorEnabled

boolean isErrorEnabled()