[logback-dev] [JIRA] Created: (LBCLASSIC-134) DuplicateMessageFilter should bypass checking msgCache for null formats

[Darryl Smith (JIRA)]

DuplicateMessageFilter should bypass checking msgCache for null formats
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                 Key: LBCLASSIC-134
                 URL: http://jira.qos.ch/browse/LBCLASSIC-134
             Project: logback-classic
          Issue Type: Bug
    Affects Versions: 0.9.15
            Reporter: Darryl Smith
            Assignee: Logback dev list
         Attachments: LBCLASSIC-134.patch

Calls to isXXXEnabled translate to a call to Logger.callTurboFilters which invokes DuplicateMessageFilter with a null format 

DuplicateMessageFilter usage of LRUMessageCache will group together all null formats under msgCount.

e.g.

msgCache.getMessageCount(null) = msgCount 1
msgCache.getMessageCount(null) = msgCount 2
msgCache.getMessageCount(null) = msgCount 3

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