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Java Source Code / Java Documentation » Development » SLF4J » org.slf4j

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

org.slf4j .MDC

MDC

public class MDC (Code)

This class hides and serves as a substitute for the underlying logging system's MDC implementation.

If the underlying logging system offers MDC functionality, then SLF4J's MDC, i.e. this class, will delegate to the underlying system's MDC. Note that at this time, only two logging systems, namely log4j and logback, offer MDC functionality. If the undelying system does not support MDC, then SLF4J will silently drop MDC information.

Thus, as a SLF4J user, you can take advantage of MDC in the presence of log4j or logback, but without forcing log4j or logback as dependencies upon your users.

For more information on MDC please see the chapter on MDC in the logback manual.

Please note that all methods in this class are static.
author:
Ceki Gülcü
since:
1.4.1

Field Summary
final static String	NO_STATIC_MDC_BINDER_URL
final static String	NULL_MDCA_URL
static MDCAdapter	mdcAdapter

Method Summary
public static void	clear() Clear all entries in the MDC of the underlying implementation.
public static String	get(String key) Get the context identified by the `key` parameter.
public static MDCAdapter	getMDCAdapter() Returns the MDCAdapter instance currently in use.
public static void	put(String key, String val) Put a context value (the `val` parameter) as identified with the `key` parameter into the current thread's context map. The `key` parameter cannot be null.
public static void	remove(String key) Remove the the context identified by the `key` parameter using the underlying system's MDC implementation.

Field Detail

NO_STATIC_MDC_BINDER_URL
final static String NO_STATIC_MDC_BINDER_URL(Code)

NULL_MDCA_URL
final static String NULL_MDCA_URL(Code)

mdcAdapter
static MDCAdapter mdcAdapter(Code)

Method Detail

clear
public static void clear()(Code)
	Clear all entries in the MDC of the underlying implementation.

get
public static String get(String key) throws IllegalArgumentException(Code)
	Get the context identified by the `key` parameter. The `key` parameter cannot be null. This method delegates all work to the MDC of the underlying logging system. the string value identified by the `key` parameter. throws: IllegalArgumentException - in case the "key" parameter is null

getMDCAdapter
public static MDCAdapter getMDCAdapter()(Code)
	Returns the MDCAdapter instance currently in use. the MDcAdapter instance currently in use. since: 1.4.2

put
public static void put(String key, String val) throws IllegalArgumentException(Code)
	Put a context value (the `val` parameter) as identified with the `key` parameter into the current thread's context map. The `key` parameter cannot be null. The code>val parameter can be null only if the underlying implementation supports it. This method delegates all work to the MDC of the underlying logging system. throws: IllegalArgumentException - in case the "key" parameter is null

remove
public static void remove(String key) throws IllegalArgumentException(Code)
	Remove the the context identified by the `key` parameter using the underlying system's MDC implementation. The `key` parameter cannot be null. This method does nothing if there is no previous value associated with `key`. throws: IllegalArgumentException - in case the "key" parameter is null

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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