Merge. #522
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Merge. #522
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TimeBasedRollingFileAppender uses `filenamePattern` alone with current date time as opened filename and `filename` field is left empty almost all the time. This brings the problem when it calls `append()` method from the base class FileAppenderBase. The base class FileAppenderBase assumes that `filename` field is the path for opened file. Now this contract is broken. Currently, this will cause log4cplus to print "log4cplus: ERROR file is not open:" when `out` stream is broken. It's confusing and misleading. Users may think that log4cplus tries to open a file with the empty name "". This does not stop here, as long as it persists, more subtle bugs can be introduced. This commit fixes this problem by setting filename to the name of current opened file in `TimeBasedRollingFileAppender::open()` making the contract valid again. Signed-off-by: foxhlchen <foxhlchen@gmail.com>
TimeBasedRollingFileAppender: Clear files before the MaxHistory when CleanHistoryOnStart false. log4cplus#381
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