[logback-dev] [JIRA] Updated: (LBCLASSIC-126) NDC implementation

[Anders Wallgren (JIRA)]

     [ http://jira.qos.ch/browse/LBCLASSIC-126?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Anders Wallgren updated LBCLASSIC-126:
--------------------------------------

    Attachment: NDC.java

> NDC implementation
> ------------------
>
>                 Key: LBCLASSIC-126
>                 URL: http://jira.qos.ch/browse/LBCLASSIC-126
>             Project: logback-classic
>          Issue Type: New Feature
>    Affects Versions: 0.9.15
>            Reporter: Anders Wallgren
>            Assignee: Logback dev list
>         Attachments: NDC.java
>
>
> The discussion about NDC vs. MDC has been done going for quite a while. I don't think MDC is a suitable replacement for NDC, except insofar as NDC can be implemented using MDC.
> Enclosed is the NDC implementation we're started using at Electric Cloud. Please feel free to adapt/modify/enhance it as you see fit. We place this code in the public domain in case others find it useful.
> Attachment to come as well.
> // NDC.java --
> //
> // NDC.java is part of the ElectricCommander server.
> //
> // Copyright (c) 2005-2009 Electric Cloud, Inc.
> // All rights reserved.
> //
> package com.electriccloud.log;
> import java.util.Deque;
> import java.util.LinkedList;
> import org.jetbrains.annotations.NonNls;
> import org.jetbrains.annotations.NotNull;
> import org.slf4j.MDC;
> /**
>  * Utility object that implements NDC using MDC.
>  */
> @SuppressWarnings({"UtilityClass", "StringContatenationInLoop"})
> public class NDC
> {
>     //~ Static fields/initializers ---------------------------------------------
>     private static final ThreadLocal<Deque<String>> s_stack =
>         new ThreadLocal<Deque<String>>() {
>             @Override @SuppressWarnings({"RefusedBequest"})
>             protected Deque<String> initialValue()
>             {
>                 return new LinkedList<String>();
>             }
>         };
>     //~ Constructors -----------------------------------------------------------
>     private NDC()
>     {
>     }
>     //~ Methods ----------------------------------------------------------------
>     public static void pop()
>     {
>         Deque<String> stack = s_stack.get();
>         // Pop the stack if isn't already empty
>         if (!stack.isEmpty()) {
>             stack.pop();
>         }
>         // Put the previous value in the MDC (null if the stack is now empty)
>         MDC.put("NDC", stack.peek());
>     }
>     @SuppressWarnings({"HardCodedStringLiteral"})
>     public static void push(@NonNls @NotNull String format, Object... args)
>     {
>         Deque<String> stack    = s_stack.get();
>         String        previous = stack.peek();
>         String        segment  = args.length == 0
>             ? format
>             : String.format(format, args);
>         String        newValue = previous == null
>             ? segment
>             : String.format("%s %s", previous, segment);
>         stack.push(newValue);
>         MDC.put("NDC", newValue);
>     }
> }

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