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OpenEdge ABL API Reference

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OpenEdge.Logging.MDC

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  • Last Updated: January 15, 2026
  • 2 minute read
    • OpenEdge
    • Version 12.8
    • Documentation
Namespace: OpenEdge.Logging
Type: Class MDC
Parent Classes:
Progress.Lang.Object
OpenEdge.Logging.MDC

Inherits: Progress.Lang.Object

Copyright (c) 2018, 2021 by Progress Software Corporation. All rights reserved.
File:MDC
Purpose:Mapped Diagnostic Context object: A set of key/value pairs consumed by logger filters
Author(s):pjudge
Created:2018-11-19
Notes:- The context values can be tokenised via ${mdc.<context-key>} tokens
and are resolved by the OpenEdge.Logging.Format.MDCTokenFormat
format filter.
/* (required) The backing store for the MDC



Method Summary
  Options Name Purpose
  Clear () /* Clear all entries in the MDC */
  CHARACTER Get (character) /* Get the context identified by the key parameter. @param character A non-empty key name @return character A value associated with the key */
  LOGICAL Has (character) /* Indicates whether a key exists in the store. @param character A non-empty key name @return logical TRUE if the key is in the context store; FALSE otherwise */
  LOGICAL IsEmpty () /* Indicates whether there is any contest in the store. @return logical Returns TRUE if there's at least one entry in the store */
  Put (character, character) /* Adds a context value to the MDC context @param character A non-empty key name @param character A value associated with the key */
  Remove (character) /* Remove the context identified by the key parameter. @param character A non-empty key name */

Constructor Summary
  Options Name Purpose
  MDC () /* Static constructor */
  MDC () /* Default constructor. PRIVATE since we never want this class instantiated. */

Method Detail
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Clear ()

/* Clear all entries in the MDC
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CHARACTER Get (character)

/* Get the context identified by the key parameter.
Parameters:
pKey CHARACTER
 
Returns CHARACTER
  character A value associated with the key
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LOGICAL Has (character)

/* Indicates whether a key exists in the store.
Parameters:
pKey CHARACTER
 
Returns LOGICAL
  logical TRUE if the key is in the context store; FALSE otherwise
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LOGICAL IsEmpty ()

/* Indicates whether there is any contest in the store.
Returns LOGICAL
  logical Returns TRUE if there's at least one entry in the store
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Put (character, character)

/* Adds a context value to the MDC context
Parameters:
pKey CHARACTER
 
pValue CHARACTER
 
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Remove (character)

/* Remove the context identified by the key parameter.
Parameters:
pKey CHARACTER
 


Constructor Detail
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STATIC MDC ()

/* Static constructor
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MDC ()

/* Default constructor.
PRIVATE since we never want this class instantiated.


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