Logger (Apache jclouds 1.7.3 API)

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()

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.

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)`

Interface Logger

Nested Class Summary

Field Summary

Method Summary

Field Detail

NULL

CONSOLE

Method Detail

getCategory

trace

isTraceEnabled

debug

isDebugEnabled

info

isInfoEnabled

warn

warn

isWarnEnabled

error

error

isErrorEnabled