MDC (OPS4J Pax Logging - API 2.3.1 API)

java.lang.Object
- org.apache.log4j.MDC

```
public class MDC
extends Object
```
The MDC class is similar to the NDC class except that it is based on a map instead of a stack. It provides mapped diagnostic contexts. A Mapped Diagnostic Context, or MDC in short, is an instrument for distinguishing interleaved log output from different sources. Log output is typically interleaved when a server handles multiple clients near-simultaneously.
The MDC is managed on a per thread basis. A child thread automatically inherits a copy of the mapped diagnostic context of its parent.
The MDC class requires JDK 1.2 or above. Under JDK 1.1 the MDC will always return empty values but otherwise will not affect or harm your application.

Since:

1.2

Author:

Ceki Gülcü

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`clear()`	Remove all values from the MDC.
`static Object`	`get(String key)`	Get the context identified by the `key` parameter.
`static Map<?,?>`	`getContext()`	Get the current thread's MDC as a hashtable.
`static void`	`put(String key, Object o)`	Put a context value (the `o` parameter) as identified with the `key` parameter into the current thread's context map.
`static void`	`remove(String key)`	Remove the the context identified by the `key` parameter.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - put
```
public static void put(String key,
                       Object o)
```
    Put a context value (the o parameter) as identified with the key parameter into the current thread's context map.
    If the current thread does not have a context map it is created as a side effect.
  - get
```
public static Object get(String key)
```
    Get the context identified by the key parameter.
    This method has no side effects.
  - remove
```
public static void remove(String key)
```
    Remove the the context identified by the key parameter.
  - getContext
```
public static Map<?,?> getContext()
```
    Get the current thread's MDC as a hashtable. This method is intended to be used internally. pax-logging note: this method has different return type than original org.apache.log4j.MDC. Originally this method returns Hashtable, but pax-logging's version returned Map for very long time.
  - clear
```
public static void clear()
```
    Remove all values from the MDC.
    
    Since:
    
    1.2.16