org.slf4j.helpers

## Class BasicMDCAdapter

- java.lang.Object
- - org.slf4j.helpers.BasicMDCAdapter

- All Implemented Interfaces:
    MDCAdapter

      public class BasicMDCAdapter
      extends Object
      implements MDCAdapter

  Basic MDC implementation, which can be used with logging systems that lack out-of-the-box MDC support. This code was initially inspired by logback's LogbackMDCAdapter. However, LogbackMDCAdapter has evolved and is now considerably more sophisticated.
  Since:
    1.5.0
  Author:
    Ceki Gulcu, Maarten Bosteels, Lukasz Cwik

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `BasicMDCAdapter()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `clear()` Clear all entries in the MDC.
    `String` | `get(String key)` Get the context identified by the `key` parameter.
    `Map<String,String>` | `getCopyOfContextMap()` Return a copy of the current thread's context map.
    `Set<String>` | `getKeys()` Returns the keys in the MDC as a `Set` of `String`s The returned value can be null.
    `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.
    `void` | `remove(String key)` Remove the the context identified by the `key` parameter.
    `void` | `setContextMap(Map<String,String> contextMap)` Set the current thread's context map by first clearing any existing map and then copying the map passed as parameter.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### BasicMDCAdapter

          public BasicMDCAdapter()

  - ### Method Detail

    - #### put

          public 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. Note that contrary to log4j, the `val` parameter can be null.

      If the current thread does not have a context map it is created as a side effect of this call.

      Specified by:
        `put` in interface `MDCAdapter`
      Throws:
        `IllegalArgumentException` - in case the "key" parameter is null

    - #### get

          public String get(String key)

      Get the context identified by the `key` parameter.
      Specified by:
        `get` in interface `MDCAdapter`
      Returns:
        the string value identified by the `key` parameter.

    - #### remove

          public void remove(String key)

      Remove the the context identified by the `key` parameter.
      Specified by:
        `remove` in interface `MDCAdapter`

    - #### clear

          public void clear()

      Clear all entries in the MDC.
      Specified by:
        `clear` in interface `MDCAdapter`

    - #### getKeys

          public Set<String> getKeys()

      Returns the keys in the MDC as a `Set` of `String`s The returned value can be null.
      Returns:
        the keys in the MDC

    - #### getCopyOfContextMap

          public Map<String,String> getCopyOfContextMap()

      Return a copy of the current thread's context map. Returned value may be null.
      Specified by:
        `getCopyOfContextMap` in interface `MDCAdapter`
      Returns:
        A copy of the current thread's context map. May be null.

    - #### setContextMap

          public void setContextMap(Map<String,String> contextMap)

      Description copied from interface: `MDCAdapter`
      Set the current thread's context map by first clearing any existing map and then copying the map passed as parameter. The context map parameter must only contain keys and values of type String.
      Specified by:
        `setContextMap` in interface `MDCAdapter`
      Parameters:
        `contextMap` - must contain only keys and values of type String

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